diff --git a/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/AconfigStorageException.java b/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/AconfigStorageException.java
index b1c7ee7..324c55d 100644
--- a/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/AconfigStorageException.java
+++ b/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/AconfigStorageException.java
@@ -39,6 +39,8 @@
     /** Error code indicating that there was an error reading the Aconfig Storage file. */
     public static final int ERROR_CANNOT_READ_STORAGE_FILE = 4;
 
+    public static final int ERROR_FILE_FINGERPRINT_MISMATCH = 5;
+
     private final int mErrorCode;
 
     /**
@@ -126,6 +128,8 @@
                 return "ERROR_CONTAINER_NOT_FOUND";
             case ERROR_CANNOT_READ_STORAGE_FILE:
                 return "ERROR_CANNOT_READ_STORAGE_FILE";
+            case ERROR_FILE_FINGERPRINT_MISMATCH:
+                return "ERROR_FILE_FINGERPRINT_MISMATCH";
             default:
                 return "<Unknown error code " + mErrorCode + ">";
         }
diff --git a/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/FileType.java b/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/FileType.java
index b0b1b9b..c354873 100644
--- a/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/FileType.java
+++ b/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/FileType.java
@@ -42,4 +42,20 @@
                 return null;
         }
     }
+
+    @Override
+    public String toString() {
+        switch (type) {
+            case 0:
+                return "PACKAGE_MAP";
+            case 1:
+                return "FLAG_MAP";
+            case 2:
+                return "FLAG_VAL";
+            case 3:
+                return "FLAG_INFO";
+            default:
+                return "unrecognized type";
+        }
+    }
 }
diff --git a/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/StorageFileProvider.java b/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/StorageFileProvider.java
index 8306cc6..f1a4e26 100644
--- a/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/StorageFileProvider.java
+++ b/tools/aconfig/aconfig_storage_file/srcs/android/aconfig/storage/StorageFileProvider.java
@@ -26,7 +26,10 @@
 import java.nio.file.Paths;
 import java.nio.file.StandardOpenOption;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 /** @hide */
 public class StorageFileProvider {
@@ -52,13 +55,20 @@
     }
 
     /** @hide */
-    public List<Path> listPackageMapFiles() {
-        List<Path> result = new ArrayList<>();
+    public List<String> listContainers(String[] excludes) {
+        List<String> result = new ArrayList<>();
+        Set<String> set = new HashSet<>(Arrays.asList(excludes));
+
         try {
             DirectoryStream<Path> stream =
                     Files.newDirectoryStream(Paths.get(mMapPath), "*" + PMAP_FILE_EXT);
             for (Path entry : stream) {
-                result.add(entry);
+                String fileName = entry.getFileName().toString();
+                String container =
+                        fileName.substring(0, fileName.length() - PMAP_FILE_EXT.length());
+                if (!set.contains(container)) {
+                    result.add(container);
+                }
             }
         } catch (NoSuchFileException e) {
             return result;
@@ -77,22 +87,23 @@
 
     /** @hide */
     public FlagTable getFlagTable(String container) {
-        return FlagTable.fromBytes(mapStorageFile(Paths.get(mMapPath, container + FMAP_FILE_EXT)));
+        return FlagTable.fromBytes(
+                mapStorageFile(Paths.get(mMapPath, container + FMAP_FILE_EXT), FileType.FLAG_MAP));
     }
 
     /** @hide */
     public FlagValueList getFlagValueList(String container) {
         return FlagValueList.fromBytes(
-                mapStorageFile(Paths.get(mBootPath, container + VAL_FILE_EXT)));
+                mapStorageFile(Paths.get(mBootPath, container + VAL_FILE_EXT), FileType.FLAG_VAL));
     }
 
     /** @hide */
     public static PackageTable getPackageTable(Path path) {
-        return PackageTable.fromBytes(mapStorageFile(path));
+        return PackageTable.fromBytes(mapStorageFile(path, FileType.PACKAGE_MAP));
     }
 
     // Map a storage file given file path
-    private static MappedByteBuffer mapStorageFile(Path file) {
+    private static MappedByteBuffer mapStorageFile(Path file, FileType type) {
         FileChannel channel = null;
         try {
             channel = FileChannel.open(file, StandardOpenOption.READ);
@@ -100,7 +111,7 @@
         } catch (Exception e) {
             throw new AconfigStorageException(
                     AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
-                    String.format("Fail to mmap storage file %s", file),
+                    String.format("Fail to mmap storage %s file %s", type.toString(), file),
                     e);
         } finally {
             quietlyDispose(channel);
diff --git a/tools/aconfig/aconfig_storage_file/tests/srcs/StorageFileProviderTest.java b/tools/aconfig/aconfig_storage_file/tests/srcs/StorageFileProviderTest.java
index 4e90e6c..a820970 100644
--- a/tools/aconfig/aconfig_storage_file/tests/srcs/StorageFileProviderTest.java
+++ b/tools/aconfig/aconfig_storage_file/tests/srcs/StorageFileProviderTest.java
@@ -29,7 +29,6 @@
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
-import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
 
@@ -37,15 +36,20 @@
 public class StorageFileProviderTest {
 
     @Test
-    public void testListpackageMapFiles() throws Exception {
+    public void testlistContainers() throws Exception {
         StorageFileProvider p =
                 new StorageFileProvider(TestDataUtils.TESTDATA_PATH, TestDataUtils.TESTDATA_PATH);
-        List<Path> file = p.listPackageMapFiles();
-        assertEquals(2, file.size());
+        String[] excludes = {};
+        List<String> containers = p.listContainers(excludes);
+        assertEquals(2, containers.size());
+
+        excludes = new String[] {"mock.v1"};
+        containers = p.listContainers(excludes);
+        assertEquals(1, containers.size());
 
         p = new StorageFileProvider("fake/path/", "fake/path/");
-        file = p.listPackageMapFiles();
-        assertTrue(file.isEmpty());
+        containers = p.listContainers(excludes);
+        assertTrue(containers.isEmpty());
     }
 
     @Test
@@ -56,8 +60,7 @@
         assertNotNull(pt);
         pt =
                 StorageFileProvider.getPackageTable(
-                        Paths.get(
-                                TestDataUtils.TESTDATA_PATH, "mock.v1.package.map"));
+                        Paths.get(TestDataUtils.TESTDATA_PATH, "mock.v1.package.map"));
         assertNotNull(pt);
         FlagTable f = p.getFlagTable("mock.v1");
         assertNotNull(f);
diff --git a/tools/aconfig/aconfig_storage_read_api/Android.bp b/tools/aconfig/aconfig_storage_read_api/Android.bp
index 3238d79..09daeea 100644
--- a/tools/aconfig/aconfig_storage_read_api/Android.bp
+++ b/tools/aconfig/aconfig_storage_read_api/Android.bp
@@ -154,12 +154,13 @@
 java_library {
     name: "aconfig_storage_reader_java",
     srcs: [
-        "srcs/android/aconfig/storage/AconfigPackageImpl.java",
         "srcs/android/aconfig/storage/StorageInternalReader.java",
+        "srcs/android/os/flagging/PlatformAconfigPackageInternal.java",
     ],
     libs: [
         "unsupportedappusage",
         "strict_mode_stub",
+        "aconfig_storage_stub",
     ],
     static_libs: [
         "aconfig_storage_file_java",
@@ -176,8 +177,8 @@
 java_library {
     name: "aconfig_storage_reader_java_none",
     srcs: [
-        "srcs/android/aconfig/storage/AconfigPackageImpl.java",
         "srcs/android/aconfig/storage/StorageInternalReader.java",
+        "srcs/android/os/flagging/PlatformAconfigPackageInternal.java",
     ],
     libs: [
         "unsupportedappusage-sdk-none",
diff --git a/tools/aconfig/aconfig_storage_read_api/srcs/android/aconfig/storage/AconfigPackageImpl.java b/tools/aconfig/aconfig_storage_read_api/srcs/android/aconfig/storage/AconfigPackageImpl.java
deleted file mode 100644
index 6bf4e05..0000000
--- a/tools/aconfig/aconfig_storage_read_api/srcs/android/aconfig/storage/AconfigPackageImpl.java
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * Copyright (C) 2024 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.aconfig.storage;
-
-import android.os.StrictMode;
-
-import java.nio.file.Path;
-
-/** @hide */
-public class AconfigPackageImpl {
-    private FlagTable mFlagTable;
-    private FlagValueList mFlagValueList;
-    private PackageTable.Node mPNode;
-    private final int mPackageId;
-    private final int mBooleanStartIndex;
-
-    private AconfigPackageImpl(
-            FlagTable flagTable,
-            FlagValueList flagValueList,
-            int packageId,
-            int booleanStartIndex) {
-        this.mFlagTable = flagTable;
-        this.mFlagValueList = flagValueList;
-        this.mPackageId = packageId;
-        this.mBooleanStartIndex = booleanStartIndex;
-    }
-
-    public static AconfigPackageImpl load(String packageName, StorageFileProvider fileProvider) {
-        StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
-        PackageTable.Node pNode = null;
-        try {
-            // First try to find the package in the "system" container.
-            pNode = fileProvider.getPackageTable("system").get(packageName);
-        } catch (Exception e) {
-            //
-        }
-        try {
-            if (pNode != null) {
-                return new AconfigPackageImpl(
-                        fileProvider.getFlagTable("system"),
-                        fileProvider.getFlagValueList("system"),
-                        pNode.getPackageId(),
-                        pNode.getBooleanStartIndex());
-            }
-
-            // If not found in "system", search all package map files.
-            for (Path p : fileProvider.listPackageMapFiles()) {
-                PackageTable pTable = fileProvider.getPackageTable(p);
-                pNode = pTable.get(packageName);
-                if (pNode != null) {
-                    return new AconfigPackageImpl(
-                            fileProvider.getFlagTable(pTable.getHeader().getContainer()),
-                            fileProvider.getFlagValueList(pTable.getHeader().getContainer()),
-                            pNode.getPackageId(),
-                            pNode.getBooleanStartIndex());
-                }
-            }
-        } catch (AconfigStorageException e) {
-            // Consider logging the exception.
-            throw e;
-        } finally {
-            StrictMode.setThreadPolicy(oldPolicy);
-        }
-        // Package not found.
-        throw new AconfigStorageException(
-                AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
-                "Package " + packageName + " not found.");
-    }
-
-    public static AconfigPackageImpl load(
-            String container, String packageName, StorageFileProvider fileProvider) {
-
-        StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
-        try {
-            PackageTable.Node pNode = fileProvider.getPackageTable(container).get(packageName);
-            if (pNode != null) {
-                return new AconfigPackageImpl(
-                        fileProvider.getFlagTable(container),
-                        fileProvider.getFlagValueList(container),
-                        pNode.getPackageId(),
-                        pNode.getBooleanStartIndex());
-            }
-        } catch (AconfigStorageException e) {
-            // Consider logging the exception.
-            throw e;
-        } finally {
-            StrictMode.setThreadPolicy(oldPolicy);
-        }
-
-        throw new AconfigStorageException(
-                AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
-                "package "
-                        + packageName
-                        + " in container "
-                        + container
-                        + " cannot be found on the device");
-    }
-
-    public boolean getBooleanFlagValue(String flagName, boolean defaultValue) {
-        FlagTable.Node fNode = mFlagTable.get(mPackageId, flagName);
-        if (fNode == null) return defaultValue;
-        return mFlagValueList.getBoolean(fNode.getFlagIndex() + mBooleanStartIndex);
-    }
-
-    public boolean getBooleanFlagValue(int index) {
-        return mFlagValueList.getBoolean(index + mBooleanStartIndex);
-    }
-}
diff --git a/tools/aconfig/aconfig_storage_read_api/srcs/android/os/flagging/PlatformAconfigPackageInternal.java b/tools/aconfig/aconfig_storage_read_api/srcs/android/os/flagging/PlatformAconfigPackageInternal.java
new file mode 100644
index 0000000..83310be
--- /dev/null
+++ b/tools/aconfig/aconfig_storage_read_api/srcs/android/os/flagging/PlatformAconfigPackageInternal.java
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.os.flagging;
+
+import android.aconfig.storage.AconfigStorageException;
+import android.aconfig.storage.FlagTable;
+import android.aconfig.storage.FlagValueList;
+import android.aconfig.storage.PackageTable;
+import android.aconfig.storage.StorageFileProvider;
+import android.compat.annotation.UnsupportedAppUsage;
+import android.os.StrictMode;
+
+/**
+ * An {@code aconfig} package containing the enabled state of its flags.
+ *
+ * <p><strong>Note: this is intended only to be used by generated code. To determine if a given flag
+ * is enabled in app code, the generated android flags should be used.</strong>
+ *
+ * <p>This class is not part of the public API and should be used by Acnofig Flag internally </b> It
+ * is intended for internal use only and will be changed or removed without notice.
+ *
+ * <p>This class is used to read the flag from Aconfig Package.Each instance of this class will
+ * cache information related to one package. To read flags from a different package, a new instance
+ * of this class should be {@link #load loaded}.
+ *
+ * @hide
+ */
+public class PlatformAconfigPackageInternal {
+
+    private final FlagTable mFlagTable;
+    private final FlagValueList mFlagValueList;
+    private final int mPackageId;
+    private final int mPackageBooleanStartOffset;
+    private final AconfigStorageException mException;
+
+    private PlatformAconfigPackageInternal(
+            FlagValueList flagValueList,
+            FlagTable flagTable,
+            int packageBooleanStartOffset,
+            int packageId,
+            AconfigStorageException exception) {
+        this.mFlagValueList = flagValueList;
+        this.mFlagTable = flagTable;
+        this.mPackageBooleanStartOffset = packageBooleanStartOffset;
+        this.mPackageId = packageId;
+        this.mException = exception;
+    }
+
+    /**
+     * Loads an Aconfig Package from platform Aconfig Storage.
+     *
+     * <p>This method is intended for internal use only and may be changed or removed without
+     * notice.
+     *
+     * <p>This method loads the specified Aconfig Package from the given container.
+     *
+     * <p>AconfigStorageException will be stored if there is an error reading from Aconfig Storage.
+     * The specific error code can be got using {@link #getException()}.
+     *
+     * @param container The name of the container.
+     * @param packageName The name of the Aconfig package to load.
+     * @return An instance of {@link PlatformAconfigPackageInternal}
+     * @hide
+     */
+    @UnsupportedAppUsage
+    public static PlatformAconfigPackageInternal load(String container, String packageName) {
+        return load(container, packageName, StorageFileProvider.getDefaultProvider());
+    }
+
+    /** @hide */
+    public static PlatformAconfigPackageInternal load(
+            String container, String packageName, StorageFileProvider fileProvider) {
+        StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
+        try {
+            PackageTable.Node pNode = fileProvider.getPackageTable(container).get(packageName);
+
+            if (pNode == null) {
+                return createExceptionInstance(
+                        AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
+                        "package "
+                                + packageName
+                                + " in container "
+                                + container
+                                + " cannot be found on the device");
+            }
+
+            return new PlatformAconfigPackageInternal(
+                    fileProvider.getFlagValueList(container),
+                    fileProvider.getFlagTable(container),
+                    pNode.getBooleanStartIndex(),
+                    pNode.getPackageId(),
+                    null);
+
+        } catch (AconfigStorageException e) {
+            return createExceptionInstance(e.getErrorCode(), e.getMessage());
+        } finally {
+            StrictMode.setThreadPolicy(oldPolicy);
+        }
+    }
+
+    /**
+     * Loads an Aconfig package from the specified container and verifies its fingerprint.
+     *
+     * <p>This method is intended for internal use only and may be changed or removed without
+     * notice.
+     *
+     * <p>AconfigStorageException will be stored if there is an error reading from Aconfig Storage.
+     * The specific error code can be got using {@link #getException()}.
+     *
+     * @param container The name of the container.
+     * @param packageName The name of the Aconfig package.
+     * @param packageFingerprint The expected fingerprint of the package.
+     * @return An instance of {@link PlatformAconfigPackageInternal} representing the loaded
+     *     package.
+     * @hide
+     */
+    @UnsupportedAppUsage
+    public static PlatformAconfigPackageInternal load(
+            String container, String packageName, long packageFingerprint) {
+        return load(
+                container,
+                packageName,
+                packageFingerprint,
+                StorageFileProvider.getDefaultProvider());
+    }
+
+    /** @hide */
+    public static PlatformAconfigPackageInternal load(
+            String container,
+            String packageName,
+            long packageFingerprint,
+            StorageFileProvider fileProvider) {
+        StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
+        try {
+            PackageTable.Node pNode = fileProvider.getPackageTable(container).get(packageName);
+
+            if (pNode == null) {
+                return createExceptionInstance(
+                        AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
+                        "package "
+                                + packageName
+                                + " in container "
+                                + container
+                                + " cannot be found on the device");
+            }
+
+            if (pNode.hasPackageFingerprint()
+                    && packageFingerprint != pNode.getPackageFingerprint()) {
+                return new PlatformAconfigPackageInternal(
+                        fileProvider.getFlagValueList(container),
+                        fileProvider.getFlagTable(container),
+                        pNode.getBooleanStartIndex(),
+                        pNode.getPackageId(),
+                        new AconfigStorageException(
+                                AconfigStorageException.ERROR_FILE_FINGERPRINT_MISMATCH,
+                                "The fingerprint provided for the Aconfig package "
+                                        + packageName
+                                        + " in container "
+                                        + container
+                                        + " does not match"
+                                        + " the fingerprint of the package found on the device."));
+            }
+
+            return new PlatformAconfigPackageInternal(
+                    fileProvider.getFlagValueList(container),
+                    null,
+                    pNode.getBooleanStartIndex(),
+                    0,
+                    null);
+
+        } catch (AconfigStorageException e) {
+            return createExceptionInstance(e.getErrorCode(), e.getMessage());
+        } finally {
+            StrictMode.setThreadPolicy(oldPolicy);
+        }
+    }
+
+    /**
+     * Retrieves the value of a boolean flag using its index.
+     *
+     * <p>This method is intended for internal use only and may be changed or removed without
+     * notice.
+     *
+     * <p>This method retrieves the value of a flag within the loaded Aconfig package using its
+     * index. The index is generated at build time and may vary between builds.
+     *
+     * <p>To ensure you are using the correct index, verify that the package's fingerprint matches
+     * the expected fingerprint before calling this method. If the fingerprints do not match, use
+     * {@link #getBooleanFlagValue(String, boolean)} instead.
+     *
+     * @param index The index of the flag within the package.
+     * @return The boolean value of the flag.
+     * @hide
+     */
+    @UnsupportedAppUsage
+    public boolean getBooleanFlagValue(int index) {
+        return mFlagValueList.getBoolean(index + mPackageBooleanStartOffset);
+    }
+
+    /**
+     * Retrieves the value of a boolean flag using its name.
+     *
+     * <p>This method is intended for internal use only and may be changed or removed without
+     * notice.
+     *
+     * <p>This method retrieves the value of a flag within the loaded Aconfig package using its
+     * name.
+     *
+     * @param flagName The name of the flag.
+     * @param defaultValue The default value to return if the flag is not found.
+     * @return The boolean value of the flag.
+     * @hide
+     */
+    @UnsupportedAppUsage
+    public boolean getBooleanFlagValue(String flagName, boolean defaultValue) {
+        FlagTable.Node fNode = mFlagTable.get(mPackageId, flagName);
+        if (fNode == null) {
+            return defaultValue;
+        }
+        return mFlagValueList.getBoolean(fNode.getFlagIndex() + mPackageBooleanStartOffset);
+    }
+
+    /**
+     * Returns any exception that occurred during the loading of the Aconfig package.
+     *
+     * <p>This method is intended for internal use only and may be changed or removed without
+     * notice.
+     *
+     * @return The exception that occurred, or {@code null} if no exception occurred.
+     * @hide
+     */
+    @UnsupportedAppUsage
+    public Exception getException() {
+        return mException;
+    }
+
+    /**
+     * Creates a new {@link PlatformAconfigPackageInternal} instance with an {@link
+     * AconfigStorageException}.
+     *
+     * @param errorCode The error code for the exception.
+     * @param message The error message for the exception.
+     * @return A new {@link PlatformAconfigPackageInternal} instance with the specified exception.
+     */
+    private static PlatformAconfigPackageInternal createExceptionInstance(
+            int errorCode, String message) {
+        return new PlatformAconfigPackageInternal(
+                null, null, 0, 0, new AconfigStorageException(errorCode, message));
+    }
+}
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidTest.xml b/tools/aconfig/aconfig_storage_read_api/tests/AconfigStorageReadFunctionalTest.xml
similarity index 95%
rename from tools/aconfig/aconfig_storage_read_api/tests/java/AndroidTest.xml
rename to tools/aconfig/aconfig_storage_read_api/tests/AconfigStorageReadFunctionalTest.xml
index 7ffa18c..ee50060 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidTest.xml
+++ b/tools/aconfig/aconfig_storage_read_api/tests/AconfigStorageReadFunctionalTest.xml
@@ -26,7 +26,7 @@
     </target_preparer>
 
     <target_preparer class="com.android.tradefed.targetprep.TestAppInstallSetup">
-        <option name="test-file-name" value="aconfig_storage_read_api.test.java.apk" />
+        <option name="test-file-name" value="aconfig_storage_read_functional.apk" />
     </target_preparer>
 
     <target_preparer class="com.android.tradefed.targetprep.DisableSELinuxTargetPreparer" />
@@ -45,7 +45,7 @@
 
     <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
         <option name="runner" value="androidx.test.runner.AndroidJUnitRunner" />
-        <option name="package" value="android.aconfig_storage.test" />
+        <option name="package" value="android.aconfig.storage.test" />
         <option name="runtime-hint" value="1m" />
     </test>
-</configuration>
+</configuration>
\ No newline at end of file
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidStorageJaveTest.xml b/tools/aconfig/aconfig_storage_read_api/tests/AconfigStorageReadUnitTest.xml
similarity index 69%
rename from tools/aconfig/aconfig_storage_read_api/tests/java/AndroidStorageJaveTest.xml
rename to tools/aconfig/aconfig_storage_read_api/tests/AconfigStorageReadUnitTest.xml
index 861b9b5..e528dd5 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidStorageJaveTest.xml
+++ b/tools/aconfig/aconfig_storage_read_api/tests/AconfigStorageReadUnitTest.xml
@@ -17,15 +17,15 @@
 <configuration description="Test aconfig storage java tests">
     <target_preparer class="com.android.tradefed.targetprep.suite.SuiteApkInstaller">
         <option name="cleanup-apks" value="true" />
-        <option name="test-file-name" value="aconfig_storage_package.apk" />
+        <option name="test-file-name" value="aconfig_storage_read_unit.apk" />
     </target_preparer>
     <target_preparer class="com.android.compatibility.common.tradefed.targetprep.FilePusher">
         <option name="cleanup" value="true" />
-        <option name="push" value="package_v1.map->/data/local/tmp/aconfig_storage_package/testdata/mockup.package.map" />
-        <option name="push" value="flag_v1.map->/data/local/tmp/aconfig_storage_package/testdata/mockup.flag.map" />
-        <option name="push" value="flag_v1.val->/data/local/tmp/aconfig_storage_package/testdata/mockup.val" />
-        <option name="push" value="flag_v1.info->/data/local/tmp/aconfig_storage_package/testdata/mockup.info" />
-        <option name="post-push" value="chmod +r /data/local/tmp/aconfig_storage_package/testdata/" />
+        <option name="push" value="package_v2.map->/data/local/tmp/aconfig_storage_read_unit/testdata/mockup.package.map" />
+        <option name="push" value="flag_v2.map->/data/local/tmp/aconfig_storage_read_unit/testdata/mockup.flag.map" />
+        <option name="push" value="flag_v2.val->/data/local/tmp/aconfig_storage_read_unit/testdata/mockup.val" />
+        <option name="push" value="flag_v2.info->/data/local/tmp/aconfig_storage_read_unit/testdata/mockup.info" />
+        <option name="post-push" value="chmod +r /data/local/tmp/aconfig_storage_read_unit/testdata/" />
     </target_preparer>
     <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
         <option name="package" value="android.aconfig.storage.test" />
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/Android.bp b/tools/aconfig/aconfig_storage_read_api/tests/Android.bp
index 6b8942b..fb2fc77 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/Android.bp
+++ b/tools/aconfig/aconfig_storage_read_api/tests/Android.bp
@@ -48,3 +48,53 @@
         "general-tests",
     ],
 }
+
+android_test {
+    name: "aconfig_storage_read_functional",
+    srcs: [
+        "functional/srcs/**/*.java",
+    ],
+    static_libs: [
+        "aconfig_device_paths_java",
+        "aconfig_storage_file_java",
+        "aconfig_storage_reader_java",
+        "androidx.test.rules",
+        "libaconfig_storage_read_api_java",
+        "junit",
+    ],
+    jni_libs: [
+        "libaconfig_storage_read_api_rust_jni",
+    ],
+    data: [
+        ":read_api_test_storage_files",
+    ],
+    platform_apis: true,
+    certificate: "platform",
+    test_suites: [
+        "general-tests",
+    ],
+    test_config: "AconfigStorageReadFunctionalTest.xml",
+    team: "trendy_team_android_core_experiments",
+}
+
+android_test {
+    name: "aconfig_storage_read_unit",
+    team: "trendy_team_android_core_experiments",
+    srcs: [
+        "unit/srcs/**/*.java",
+    ],
+    static_libs: [
+        "androidx.test.runner",
+        "junit",
+        "aconfig_storage_reader_java",
+    ],
+    sdk_version: "test_current",
+    data: [
+        ":read_api_test_storage_files",
+    ],
+    test_suites: [
+        "general-tests",
+    ],
+    test_config: "AconfigStorageReadUnitTest.xml",
+    jarjar_rules: "jarjar.txt",
+}
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidPackageTestManifest.xml b/tools/aconfig/aconfig_storage_read_api/tests/AndroidManifest.xml
similarity index 100%
rename from tools/aconfig/aconfig_storage_read_api/tests/java/AndroidPackageTestManifest.xml
rename to tools/aconfig/aconfig_storage_read_api/tests/AndroidManifest.xml
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/AconfigStorageReadAPITest.java b/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/AconfigStorageReadAPITest.java
similarity index 99%
rename from tools/aconfig/aconfig_storage_read_api/tests/java/AconfigStorageReadAPITest.java
rename to tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/AconfigStorageReadAPITest.java
index 191741e..6dd1bce 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/AconfigStorageReadAPITest.java
+++ b/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/AconfigStorageReadAPITest.java
@@ -267,4 +267,4 @@
             assertEquals(rVal, jVal);
         }
     }
-}
+}
\ No newline at end of file
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/PlatformAconfigPackageInternalTest.java b/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/PlatformAconfigPackageInternalTest.java
new file mode 100644
index 0000000..15cfc3b
--- /dev/null
+++ b/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/PlatformAconfigPackageInternalTest.java
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.aconfig.storage.test;
+
+import static android.aconfig.nano.Aconfig.ENABLED;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import android.aconfig.DeviceProtos;
+import android.aconfig.nano.Aconfig.parsed_flag;
+import android.aconfig.storage.AconfigStorageException;
+import android.aconfig.storage.FlagTable;
+import android.aconfig.storage.FlagValueList;
+import android.aconfig.storage.PackageTable;
+import android.aconfig.storage.StorageFileProvider;
+import android.os.flagging.PlatformAconfigPackageInternal;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+@RunWith(JUnit4.class)
+public class PlatformAconfigPackageInternalTest {
+
+    private static final Set<String> PLATFORM_CONTAINERS = Set.of("system", "vendor", "product");
+
+    @Test
+    public void testAconfigPackageInternal_load() throws IOException {
+        List<parsed_flag> flags = DeviceProtos.loadAndParseFlagProtos();
+        Map<String, PlatformAconfigPackageInternal> readerMap = new HashMap<>();
+        StorageFileProvider fp = StorageFileProvider.getDefaultProvider();
+
+        for (parsed_flag flag : flags) {
+
+            String container = flag.container;
+            String packageName = flag.package_;
+            String flagName = flag.name;
+            if (!PLATFORM_CONTAINERS.contains(container)) continue;
+
+            PackageTable pTable = fp.getPackageTable(container);
+            PackageTable.Node pNode = pTable.get(packageName);
+            FlagTable fTable = fp.getFlagTable(container);
+            FlagTable.Node fNode = fTable.get(pNode.getPackageId(), flagName);
+            FlagValueList fList = fp.getFlagValueList(container);
+
+            int index = pNode.getBooleanStartIndex() + fNode.getFlagIndex();
+            boolean rVal = fList.getBoolean(index);
+
+            PlatformAconfigPackageInternal reader = readerMap.get(packageName);
+            if (reader == null) {
+                reader = PlatformAconfigPackageInternal.load(container, packageName);
+                assertNull(reader.getException());
+                readerMap.put(packageName, reader);
+            }
+            boolean jVal = reader.getBooleanFlagValue(flagName, !rVal);
+
+            assertEquals(rVal, jVal);
+        }
+    }
+
+    @Test
+    public void testPlatformAconfigPackageInternal_load_with_fingerprint() throws IOException {
+        List<parsed_flag> flags = DeviceProtos.loadAndParseFlagProtos();
+        Map<String, PlatformAconfigPackageInternal> readerMap = new HashMap<>();
+        StorageFileProvider fp = StorageFileProvider.getDefaultProvider();
+
+        for (parsed_flag flag : flags) {
+
+            String container = flag.container;
+            String packageName = flag.package_;
+            String flagName = flag.name;
+            if (!PLATFORM_CONTAINERS.contains(container)) continue;
+
+            PackageTable pTable = fp.getPackageTable(container);
+            PackageTable.Node pNode = pTable.get(packageName);
+            FlagTable fTable = fp.getFlagTable(container);
+            FlagTable.Node fNode = fTable.get(pNode.getPackageId(), flagName);
+            FlagValueList fList = fp.getFlagValueList(container);
+
+            int index = pNode.getBooleanStartIndex() + fNode.getFlagIndex();
+            boolean rVal = fList.getBoolean(index);
+
+            long fingerprint = pNode.getPackageFingerprint();
+
+            PlatformAconfigPackageInternal reader = readerMap.get(packageName);
+            if (reader == null) {
+                reader = PlatformAconfigPackageInternal.load(container, packageName, fingerprint);
+                assertNull(reader.getException());
+                readerMap.put(packageName, reader);
+            }
+            boolean jVal = reader.getBooleanFlagValue(fNode.getFlagIndex());
+
+            assertEquals(rVal, jVal);
+        }
+    }
+
+    @Test
+    public void testAconfigPackage_load_withError() throws IOException {
+        // container not found fake_container
+        PlatformAconfigPackageInternal aPackage =
+                PlatformAconfigPackageInternal.load("fake_container", "fake_package", 0);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) aPackage.getException()).getErrorCode());
+
+        // package not found
+        aPackage = PlatformAconfigPackageInternal.load("system", "fake_container", 0);
+        assertEquals(
+                AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
+                ((AconfigStorageException) aPackage.getException()).getErrorCode());
+
+        // fingerprint doesn't match
+        List<parsed_flag> flags = DeviceProtos.loadAndParseFlagProtos();
+        StorageFileProvider fp = StorageFileProvider.getDefaultProvider();
+
+        parsed_flag flag = flags.get(0);
+
+        String container = flag.container;
+        String packageName = flag.package_;
+        boolean value = flag.state == ENABLED;
+
+        PackageTable pTable = fp.getPackageTable(container);
+        PackageTable.Node pNode = pTable.get(packageName);
+
+        if (pNode.hasPackageFingerprint()) {
+            long fingerprint = pNode.getPackageFingerprint();
+            aPackage = PlatformAconfigPackageInternal.load(container, packageName, fingerprint + 1);
+            assertEquals(
+                    // AconfigStorageException.ERROR_FILE_FINGERPRINT_MISMATCH,
+                    5, ((AconfigStorageException) aPackage.getException()).getErrorCode());
+            assertEquals(aPackage.getBooleanFlagValue(flag.name, !value), value);
+        }
+    }
+}
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/StorageInternalReaderTest.java b/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/StorageInternalReaderTest.java
similarity index 99%
rename from tools/aconfig/aconfig_storage_read_api/tests/java/StorageInternalReaderTest.java
rename to tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/StorageInternalReaderTest.java
index 3a1bba0..8a8f054 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/StorageInternalReaderTest.java
+++ b/tools/aconfig/aconfig_storage_read_api/tests/functional/srcs/StorageInternalReaderTest.java
@@ -42,4 +42,4 @@
         assertFalse(reader.getBooleanFlagValue(0));
         assertTrue(reader.getBooleanFlagValue(1));
     }
-}
+}
\ No newline at end of file
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/jarjar.txt b/tools/aconfig/aconfig_storage_read_api/tests/jarjar.txt
similarity index 91%
rename from tools/aconfig/aconfig_storage_read_api/tests/java/jarjar.txt
rename to tools/aconfig/aconfig_storage_read_api/tests/jarjar.txt
index 24952ec..49250d4 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/jarjar.txt
+++ b/tools/aconfig/aconfig_storage_read_api/tests/jarjar.txt
@@ -15,3 +15,5 @@
 rule android.aconfig.storage.PackageTable$* android.aconfig.storage.test.PackageTable$@1
 rule android.aconfig.storage.FlagValueList$* android.aconfig.storage.test.FlagValueList@1
 rule android.aconfig.storage.SipHasher13$* android.aconfig.storage.test.SipHasher13@1
+
+rule android.os.flagging.PlatformAconfigPackageInternal android.aconfig.storage.test.PlatformAconfigPackageInternal
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/AconfigPackageImplTest.java b/tools/aconfig/aconfig_storage_read_api/tests/java/AconfigPackageImplTest.java
deleted file mode 100644
index 80c0994..0000000
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/AconfigPackageImplTest.java
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * Copyright (C) 2024 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.aconfig.storage.test;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertThrows;
-import static org.junit.Assert.assertTrue;
-
-import android.aconfig.storage.AconfigPackageImpl;
-import android.aconfig.storage.AconfigStorageException;
-import android.aconfig.storage.StorageFileProvider;
-
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
-
-@RunWith(JUnit4.class)
-public class AconfigPackageImplTest {
-
-    private StorageFileProvider pr;
-
-    @Before
-    public void setup() {
-        pr = new StorageFileProvider(TestDataUtils.TESTDATA_PATH, TestDataUtils.TESTDATA_PATH);
-    }
-
-    @Test
-    public void testLoad_onlyPackageName() throws Exception {
-        AconfigPackageImpl p = AconfigPackageImpl.load("com.android.aconfig.storage.test_1", pr);
-        assertNotNull(p);
-    }
-
-    @Test
-    public void testLoad_groupNameFingerprint() throws Exception {
-        AconfigPackageImpl p =
-                AconfigPackageImpl.load("mockup", "com.android.aconfig.storage.test_1", pr);
-        assertNotNull(p);
-    }
-
-    @Test
-    public void testLoad_error() throws Exception {
-        AconfigPackageImpl p;
-        // cannot find package
-        AconfigStorageException e =
-                assertThrows(
-                        AconfigStorageException.class,
-                        () ->
-                                AconfigPackageImpl.load(
-                                        "mockup", "com.android.aconfig.storage.test_10", pr));
-        assertEquals(AconfigStorageException.ERROR_PACKAGE_NOT_FOUND, e.getErrorCode());
-        // cannot find package
-        e =
-                assertThrows(
-                        AconfigStorageException.class,
-                        () -> AconfigPackageImpl.load("com.android.aconfig.storage.test_10", pr));
-        assertEquals(AconfigStorageException.ERROR_PACKAGE_NOT_FOUND, e.getErrorCode());
-        // cannot find container
-        e =
-                assertThrows(
-                        AconfigStorageException.class,
-                        () ->
-                                AconfigPackageImpl.load(
-                                        null, "com.android.aconfig.storage.test_1", pr));
-        assertEquals(AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE, e.getErrorCode());
-        e =
-                assertThrows(
-                        AconfigStorageException.class,
-                        () ->
-                                AconfigPackageImpl.load(
-                                        "test", "com.android.aconfig.storage.test_1", pr));
-        assertEquals(AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE, e.getErrorCode());
-
-        // new storage doesn't exist
-        pr = new StorageFileProvider("fake/path/", "fake/path/");
-        e =
-                assertThrows(
-                        AconfigStorageException.class,
-                        () -> AconfigPackageImpl.load("fake_package", pr));
-        assertEquals(AconfigStorageException.ERROR_PACKAGE_NOT_FOUND, e.getErrorCode());
-
-        // file read issue
-        pr = new StorageFileProvider(TestDataUtils.TESTDATA_PATH, "fake/path/");
-        e =
-                assertThrows(
-                        AconfigStorageException.class,
-                        () ->
-                                AconfigPackageImpl.load(
-                                        "mockup", "com.android.aconfig.storage.test_1", pr));
-        assertEquals(AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE, e.getErrorCode());
-    }
-
-    @Test
-    public void testGetBooleanFlagValue_flagName() throws Exception {
-        AconfigPackageImpl p =
-                AconfigPackageImpl.load("mockup", "com.android.aconfig.storage.test_1", pr);
-        assertFalse(p.getBooleanFlagValue("disabled_rw", true));
-        assertTrue(p.getBooleanFlagValue("enabled_ro", false));
-        assertTrue(p.getBooleanFlagValue("enabled_rw", false));
-        assertFalse(p.getBooleanFlagValue("fake", false));
-    }
-
-    @Test
-    public void testGetBooleanFlagValue_index() throws Exception {
-        AconfigPackageImpl p =
-                AconfigPackageImpl.load("mockup", "com.android.aconfig.storage.test_1", pr);
-        assertFalse(p.getBooleanFlagValue(0));
-        assertTrue(p.getBooleanFlagValue(1));
-        assertTrue(p.getBooleanFlagValue(2));
-    }
-}
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/Android.bp b/tools/aconfig/aconfig_storage_read_api/tests/java/Android.bp
deleted file mode 100644
index 0de34a6..0000000
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/Android.bp
+++ /dev/null
@@ -1,48 +0,0 @@
-android_test {
-    name: "aconfig_storage_read_api.test.java",
-    srcs: ["./**/*.java"],
-    static_libs: [
-        "aconfig_device_paths_java",
-        "aconfig_storage_file_java",
-        "aconfig_storage_reader_java",
-        "androidx.test.rules",
-        "libaconfig_storage_read_api_java",
-        "junit",
-    ],
-    jni_libs: [
-        "libaconfig_storage_read_api_rust_jni",
-    ],
-    data: [
-        ":read_api_test_storage_files",
-    ],
-    platform_apis: true,
-    certificate: "platform",
-    test_suites: [
-        "general-tests",
-    ],
-    team: "trendy_team_android_core_experiments",
-}
-
-android_test {
-    name: "aconfig_storage_package",
-    team: "trendy_team_android_core_experiments",
-    srcs: [
-        "AconfigPackageImplTest.java",
-        "TestDataUtils.java",
-    ],
-    static_libs: [
-        "androidx.test.runner",
-        "junit",
-        "aconfig_storage_reader_java",
-    ],
-    test_config: "AndroidStorageJaveTest.xml",
-    manifest: "AndroidPackageTestManifest.xml",
-    sdk_version: "test_current",
-    data: [
-        ":read_api_test_storage_files",
-    ],
-    test_suites: [
-        "general-tests",
-    ],
-    jarjar_rules: "jarjar.txt",
-}
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidManifest.xml b/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidManifest.xml
deleted file mode 100644
index 78bfb37..0000000
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/AndroidManifest.xml
+++ /dev/null
@@ -1,26 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (C) 2024 The Android Open Source Project
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~      http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="android.aconfig_storage.test">
-    <application>
-        <uses-library android:name="android.test.runner" />
-    </application>
-
-    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
-                     android:targetPackage="android.aconfig_storage.test" />
-
-</manifest>
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/java/TestDataUtils.java b/tools/aconfig/aconfig_storage_read_api/tests/java/TestDataUtils.java
deleted file mode 100644
index d5cddc7..0000000
--- a/tools/aconfig/aconfig_storage_read_api/tests/java/TestDataUtils.java
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * Copyright (C) 2024 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.aconfig.storage.test;
-
-import java.io.FileInputStream;
-import java.io.InputStream;
-import java.nio.ByteBuffer;
-
-public final class TestDataUtils {
-    public static final String TEST_PACKAGE_MAP_PATH = "mockup.package.map";
-    public static final String TEST_FLAG_MAP_PATH = "mockup.flag.map";
-    public static final String TEST_FLAG_VAL_PATH = "mockup.val";
-    public static final String TEST_FLAG_INFO_PATH = "mockup.info";
-
-    public static final String TESTDATA_PATH =
-            "/data/local/tmp/aconfig_storage_package/testdata/";
-
-    public static ByteBuffer getTestPackageMapByteBuffer() throws Exception {
-        return readFile(TESTDATA_PATH + TEST_PACKAGE_MAP_PATH);
-    }
-
-    public static ByteBuffer getTestFlagMapByteBuffer() throws Exception {
-        return readFile(TESTDATA_PATH + TEST_FLAG_MAP_PATH);
-    }
-
-    public static ByteBuffer getTestFlagValByteBuffer() throws Exception {
-        return readFile(TESTDATA_PATH + TEST_FLAG_VAL_PATH);
-    }
-
-    public static ByteBuffer getTestFlagInfoByteBuffer() throws Exception {
-        return readFile(TESTDATA_PATH + TEST_FLAG_INFO_PATH);
-    }
-
-    private static ByteBuffer readFile(String fileName) throws Exception {
-        InputStream input = new FileInputStream(fileName);
-        return ByteBuffer.wrap(input.readAllBytes());
-    }
-}
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/unit/srcs/PlatformAconfigPackageInternalTest.java b/tools/aconfig/aconfig_storage_read_api/tests/unit/srcs/PlatformAconfigPackageInternalTest.java
new file mode 100644
index 0000000..392f644
--- /dev/null
+++ b/tools/aconfig/aconfig_storage_read_api/tests/unit/srcs/PlatformAconfigPackageInternalTest.java
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.aconfig.storage.test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import android.aconfig.storage.AconfigStorageException;
+import android.aconfig.storage.PackageTable;
+import android.aconfig.storage.StorageFileProvider;
+import android.os.flagging.PlatformAconfigPackageInternal;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class PlatformAconfigPackageInternalTest {
+
+    public static final String TESTDATA_PATH =
+            "/data/local/tmp/aconfig_storage_read_unit/testdata/";
+
+    private StorageFileProvider pr;
+
+    @Before
+    public void setup() {
+        pr = new StorageFileProvider(TESTDATA_PATH, TESTDATA_PATH);
+    }
+
+    @Test
+    public void testLoad_container_package() throws Exception {
+        PlatformAconfigPackageInternal p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", pr);
+        assertNull(p.getException());
+    }
+
+    @Test
+    public void testLoad_container_package_error() throws Exception {
+        // cannot find package
+        PlatformAconfigPackageInternal p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_10", pr);
+
+        assertEquals(
+                AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+
+        // cannot find container
+        p = PlatformAconfigPackageInternal.load(null, "com.android.aconfig.storage.test_1", pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+        p = PlatformAconfigPackageInternal.load("test", "com.android.aconfig.storage.test_1", pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+
+        // new storage doesn't exist
+        pr = new StorageFileProvider("fake/path/", "fake/path/");
+        p = PlatformAconfigPackageInternal.load("mockup", "com.android.aconfig.storage.test_1", pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+
+        // file read issue
+        pr = new StorageFileProvider(TESTDATA_PATH, "fake/path/");
+        p = PlatformAconfigPackageInternal.load("mockup", "com.android.aconfig.storage.test_1", pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+    }
+
+    @Test
+    public void testLoad_container_package_fingerprint() throws Exception {
+        PackageTable packageTable = pr.getPackageTable("mockup");
+
+        PackageTable.Node node1 = packageTable.get("com.android.aconfig.storage.test_1");
+
+        long fingerprint = node1.getPackageFingerprint();
+        PlatformAconfigPackageInternal p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", fingerprint, pr);
+        assertNull(p.getException());
+    }
+
+    @Test
+    public void testLoad_container_package_fingerprint_error() throws Exception {
+
+        PackageTable packageTable = pr.getPackageTable("mockup");
+
+        PackageTable.Node node1 = packageTable.get("com.android.aconfig.storage.test_1");
+
+        long fingerprint = node1.getPackageFingerprint();
+
+        // cannot find package
+        PlatformAconfigPackageInternal p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_10", fingerprint, pr);
+
+        assertEquals(
+                AconfigStorageException.ERROR_PACKAGE_NOT_FOUND,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+
+        // cannot find container
+        p =
+                PlatformAconfigPackageInternal.load(
+                        null, "com.android.aconfig.storage.test_1", fingerprint, pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+        p =
+                PlatformAconfigPackageInternal.load(
+                        "test", "com.android.aconfig.storage.test_1", fingerprint, pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+        // fingerprint doesn't match
+        p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", fingerprint + 1, pr);
+        assertEquals(
+                // AconfigStorageException.ERROR_FILE_FINGERPRINT_MISMATCH,
+                5, ((AconfigStorageException) p.getException()).getErrorCode());
+
+        // new storage doesn't exist
+        pr = new StorageFileProvider("fake/path/", "fake/path/");
+        p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", fingerprint, pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+
+        // file read issue
+        pr = new StorageFileProvider(TESTDATA_PATH, "fake/path/");
+        p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", fingerprint, pr);
+        assertEquals(
+                AconfigStorageException.ERROR_CANNOT_READ_STORAGE_FILE,
+                ((AconfigStorageException) p.getException()).getErrorCode());
+    }
+
+    @Test
+    public void testGetBooleanFlagValue_flagName() throws Exception {
+        PlatformAconfigPackageInternal p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", pr);
+        assertFalse(p.getBooleanFlagValue("disabled_rw", true));
+        assertTrue(p.getBooleanFlagValue("enabled_ro", false));
+        assertTrue(p.getBooleanFlagValue("enabled_rw", false));
+        assertFalse(p.getBooleanFlagValue("fake", false));
+    }
+
+    @Test
+    public void testGetBooleanFlagValue_index() throws Exception {
+
+        PackageTable packageTable = pr.getPackageTable("mockup");
+
+        PackageTable.Node node1 = packageTable.get("com.android.aconfig.storage.test_1");
+
+        long fingerprint = node1.getPackageFingerprint();
+        PlatformAconfigPackageInternal p =
+                PlatformAconfigPackageInternal.load(
+                        "mockup", "com.android.aconfig.storage.test_1", fingerprint, pr);
+        assertFalse(p.getBooleanFlagValue(0));
+        assertTrue(p.getBooleanFlagValue(1));
+        assertTrue(p.getBooleanFlagValue(2));
+    }
+}
diff --git a/tools/aconfig/fake_device_config/Android.bp b/tools/aconfig/fake_device_config/Android.bp
index 1f17e6b..4cd5070 100644
--- a/tools/aconfig/fake_device_config/Android.bp
+++ b/tools/aconfig/fake_device_config/Android.bp
@@ -32,3 +32,13 @@
     host_supported: true,
     is_stubs_module: true,
 }
+
+java_library {
+    name: "aconfig_storage_stub",
+    srcs: [
+        "src/android/os/flagging/**/*.java",
+    ],
+    sdk_version: "core_current",
+    host_supported: true,
+    is_stubs_module: true,
+}
diff --git a/tools/aconfig/fake_device_config/src/android/os/flagging/AconfigStorageReadException.java b/tools/aconfig/fake_device_config/src/android/os/flagging/AconfigStorageReadException.java
new file mode 100644
index 0000000..bfec98c
--- /dev/null
+++ b/tools/aconfig/fake_device_config/src/android/os/flagging/AconfigStorageReadException.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.os.flagging;
+
+public class AconfigStorageReadException extends RuntimeException {
+
+    /** Generic error code indicating an unspecified Aconfig Storage error. */
+    public static final int ERROR_GENERIC = 0;
+
+    /** Error code indicating that the Aconfig Storage system is not found on the device. */
+    public static final int ERROR_STORAGE_SYSTEM_NOT_FOUND = 1;
+
+    /** Error code indicating that the requested configuration package is not found. */
+    public static final int ERROR_PACKAGE_NOT_FOUND = 2;
+
+    /** Error code indicating that the specified container is not found. */
+    public static final int ERROR_CONTAINER_NOT_FOUND = 3;
+
+    /** Error code indicating that there was an error reading the Aconfig Storage file. */
+    public static final int ERROR_CANNOT_READ_STORAGE_FILE = 4;
+
+    public static final int ERROR_FILE_FINGERPRINT_MISMATCH = 5;
+
+    public AconfigStorageReadException(int errorCode, String msg) {
+        super(msg);
+        throw new UnsupportedOperationException("Stub!");
+    }
+
+    public AconfigStorageReadException(int errorCode, String msg, Throwable cause) {
+        super(msg, cause);
+        throw new UnsupportedOperationException("Stub!");
+    }
+
+    public AconfigStorageReadException(int errorCode, Throwable cause) {
+        super(cause);
+        throw new UnsupportedOperationException("Stub!");
+    }
+
+    public int getErrorCode() {
+        throw new UnsupportedOperationException("Stub!");
+    }
+
+    @Override
+    public String getMessage() {
+        throw new UnsupportedOperationException("Stub!");
+    }
+}