Refactor SettingsLib to remove redundant resources conditionally
Bug: 320878675
Test: manual
Change-Id: I77b3eb4cc2edbbfa6788e53004e370d49da0c0c0
diff --git a/packages/SettingsLib/AvatarPicker/src/ThreadUtils.java b/packages/SettingsLib/AvatarPicker/src/ThreadUtils.java
new file mode 100644
index 0000000..dc19e66
--- /dev/null
+++ b/packages/SettingsLib/AvatarPicker/src/ThreadUtils.java
@@ -0,0 +1,115 @@
+/*
+ * 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 com.android.settingslib.avatarpicker;
+
+import android.os.Handler;
+import android.os.Looper;
+
+import androidx.annotation.NonNull;
+
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.common.util.concurrent.MoreExecutors;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executors;
+
+// copied from SettinsLib/utils
+public class ThreadUtils {
+
+ private static volatile Thread sMainThread;
+ private static volatile Handler sMainThreadHandler;
+ private static volatile ListeningExecutorService sListeningService;
+
+ /**
+ * Returns true if the current thread is the UI thread.
+ */
+ public static boolean isMainThread() {
+ if (sMainThread == null) {
+ sMainThread = Looper.getMainLooper().getThread();
+ }
+ return Thread.currentThread() == sMainThread;
+ }
+
+ /**
+ * Returns a shared UI thread handler.
+ */
+ @NonNull
+ public static Handler getUiThreadHandler() {
+ if (sMainThreadHandler == null) {
+ sMainThreadHandler = new Handler(Looper.getMainLooper());
+ }
+
+ return sMainThreadHandler;
+ }
+
+ /**
+ * Checks that the current thread is the UI thread. Otherwise throws an exception.
+ */
+ public static void ensureMainThread() {
+ if (!isMainThread()) {
+ throw new RuntimeException("Must be called on the UI thread");
+ }
+ }
+
+ /**
+ * Posts runnable in background using shared background thread pool.
+ *
+ * @return A future of the task that can be monitored for updates or cancelled.
+ */
+ @SuppressWarnings("rawtypes")
+ @NonNull
+ public static ListenableFuture postOnBackgroundThread(@NonNull Runnable runnable) {
+ return getBackgroundExecutor().submit(runnable);
+ }
+
+ /**
+ * Posts callable in background using shared background thread pool.
+ *
+ * @return A future of the task that can be monitored for updates or cancelled.
+ */
+ @NonNull
+ public static <T> ListenableFuture<T> postOnBackgroundThread(@NonNull Callable<T> callable) {
+ return getBackgroundExecutor().submit(callable);
+ }
+
+ /**
+ * Posts the runnable on the main thread.
+ *
+ * @deprecated moving work to the main thread should be done via the main executor provided to
+ * {@link com.google.common.util.concurrent.FutureCallback} via
+ * {@link android.content.Context#getMainExecutor()} or by calling an SDK method such as
+ * {@link android.app.Activity#runOnUiThread(Runnable)} or
+ * {@link android.content.Context#getMainThreadHandler()} where appropriate.
+ */
+ @Deprecated
+ public static void postOnMainThread(@NonNull Runnable runnable) {
+ getUiThreadHandler().post(runnable);
+ }
+
+ /**
+ * Provides a shared {@link ListeningExecutorService} created using a fixed thread pool executor
+ */
+ @NonNull
+ public static synchronized ListeningExecutorService getBackgroundExecutor() {
+ if (sListeningService == null) {
+ sListeningService = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(
+ Runtime.getRuntime().availableProcessors()));
+ }
+ return sListeningService;
+ }
+}