diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/AnonymousSourceFragment.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/AnonymousSourceFragment.java
index 679f696..b29cb2a 100644
--- a/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/AnonymousSourceFragment.java
+++ b/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/AnonymousSourceFragment.java
@@ -34,7 +34,10 @@
 public class AnonymousSourceFragment extends DialogFragment {
 
     public static String TAG = AnonymousSourceFragment.class.getSimpleName();
+    @NonNull
     private InstallActionListener mInstallActionListener;
+    @NonNull
+    private AlertDialog mDialog;
 
     @Override
     public void onAttach(@NonNull Context context) {
@@ -45,7 +48,7 @@
     @NonNull
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        return new AlertDialog.Builder(getActivity())
+       mDialog = new AlertDialog.Builder(requireContext())
             .setMessage(R.string.anonymous_source_warning)
             .setPositiveButton(R.string.anonymous_source_continue,
                 ((dialog, which) -> mInstallActionListener.onPositiveResponse(
@@ -53,6 +56,7 @@
             .setNegativeButton(R.string.cancel,
                 ((dialog, which) -> mInstallActionListener.onNegativeResponse(
                     InstallStage.STAGE_USER_ACTION_REQUIRED))).create();
+       return mDialog;
     }
 
     @Override
@@ -60,4 +64,24 @@
         super.onCancel(dialog);
         mInstallActionListener.onNegativeResponse(InstallStage.STAGE_USER_ACTION_REQUIRED);
     }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setFilterTouchesWhenObscured(true);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        // This prevents tapjacking since an overlay activity started in front of Pia will
+        // cause Pia to be paused.
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(false);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(true);
+    }
 }
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/ExternalSourcesBlockedFragment.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/ExternalSourcesBlockedFragment.java
index 49901de..2314d6b 100644
--- a/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/ExternalSourcesBlockedFragment.java
+++ b/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/ExternalSourcesBlockedFragment.java
@@ -35,8 +35,12 @@
 public class ExternalSourcesBlockedFragment extends DialogFragment {
 
     private final String TAG = ExternalSourcesBlockedFragment.class.getSimpleName();
+    @NonNull
     private final InstallUserActionRequired mDialogData;
+    @NonNull
     private InstallActionListener mInstallActionListener;
+    @NonNull
+    private AlertDialog mDialog;
 
     public ExternalSourcesBlockedFragment(InstallUserActionRequired dialogData) {
         mDialogData = dialogData;
@@ -51,7 +55,7 @@
     @NonNull
     @Override
     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
-        return new AlertDialog.Builder(requireContext())
+        mDialog = new AlertDialog.Builder(requireContext())
             .setTitle(mDialogData.getAppLabel())
             .setIcon(mDialogData.getAppIcon())
             .setMessage(R.string.untrusted_external_source_warning)
@@ -62,6 +66,7 @@
                 (dialog, which) -> mInstallActionListener.onNegativeResponse(
                     mDialogData.getStageCode()))
             .create();
+        return mDialog;
     }
 
     @Override
@@ -69,4 +74,24 @@
         super.onCancel(dialog);
         mInstallActionListener.onNegativeResponse(mDialogData.getStageCode());
     }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setFilterTouchesWhenObscured(true);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        // This prevents tapjacking since an overlay activity started in front of Pia will
+        // cause Pia to be paused.
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(false);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(true);
+    }
 }
diff --git a/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/InstallConfirmationFragment.java b/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/InstallConfirmationFragment.java
index 25363d0..5ca02ea 100644
--- a/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/InstallConfirmationFragment.java
+++ b/packages/PackageInstaller/src/com/android/packageinstaller/v2/ui/fragments/InstallConfirmationFragment.java
@@ -42,6 +42,8 @@
     private final InstallUserActionRequired mDialogData;
     @NonNull
     private InstallActionListener mInstallActionListener;
+    @NonNull
+    private AlertDialog mDialog;
 
     public InstallConfirmationFragment(@NonNull InstallUserActionRequired dialogData) {
         mDialogData = dialogData;
@@ -58,7 +60,7 @@
     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
         View dialogView = getLayoutInflater().inflate(R.layout.install_content_view, null);
 
-        AlertDialog dialog = new AlertDialog.Builder(requireContext())
+        mDialog = new AlertDialog.Builder(requireContext())
             .setIcon(mDialogData.getAppIcon())
             .setTitle(mDialogData.getAppLabel())
             .setView(dialogView)
@@ -84,7 +86,7 @@
         }
         viewToEnable.setVisibility(View.VISIBLE);
 
-        return dialog;
+        return mDialog;
     }
 
     @Override
@@ -92,4 +94,24 @@
         super.onCancel(dialog);
         mInstallActionListener.onNegativeResponse(mDialogData.getStageCode());
     }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setFilterTouchesWhenObscured(true);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        // This prevents tapjacking since an overlay activity started in front of Pia will
+        // cause Pia to be paused.
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(false);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mDialog.getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(true);
+    }
 }