Don't export broadcast receivers that don't require it

Issue: google/ExoPlayer#10287
PiperOrigin-RevId: 455131138

libraries/common/src/main/java/androidx/media3/common/util/NetworkTypeObserver.java

@@ -94,7 +94,7 @@ public final class NetworkTypeObserver {
     networkType = C.NETWORK_TYPE_UNKNOWN;
     IntentFilter filter = new IntentFilter();
     filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
-    context.registerReceiver(/* receiver= */ new Receiver(), filter);
+    Util.registerReceiverNotExported(context, new Receiver(), filter);
   }
 
   /**

libraries/common/src/main/java/androidx/media3/common/util/Util.java

@@ -34,9 +34,11 @@ import android.Manifest.permission;
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.UiModeManager;
+import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
@@ -189,6 +191,54 @@ public final class Util {
     return outputStream.toByteArray();
   }
 
+  /**
+   * Registers a {@link BroadcastReceiver} that's not intended to receive broadcasts from other
+   * apps. This will be enforced by specifying {@link Context#RECEIVER_NOT_EXPORTED} if {@link
+   * #SDK_INT} is 33 or above.
+   *
+   * @param context The context on which {@link Context#registerReceiver} will be called.
+   * @param receiver The {@link BroadcastReceiver} to register. This value may be null.
+   * @param filter Selects the Intent broadcasts to be received.
+   * @return The first sticky intent found that matches {@code filter}, or null if there are none.
+   */
+  @UnstableApi
+  @Nullable
+  public static Intent registerReceiverNotExported(
+      Context context, @Nullable BroadcastReceiver receiver, IntentFilter filter) {
+    if (SDK_INT < 33) {
+      return context.registerReceiver(receiver, filter);
+    } else {
+      return context.registerReceiver(receiver, filter, Context.RECEIVER_NOT_EXPORTED);
+    }
+  }
+
+  /**
+   * Registers a {@link BroadcastReceiver} that's not intended to receive broadcasts from other
+   * apps. This will be enforced by specifying {@link Context#RECEIVER_NOT_EXPORTED} if {@link
+   * #SDK_INT} is 33 or above.
+   *
+   * @param context The context on which {@link Context#registerReceiver} will be called.
+   * @param receiver The {@link BroadcastReceiver} to register. This value may be null.
+   * @param filter Selects the Intent broadcasts to be received.
+   * @param handler Handler identifying the thread that will receive the Intent.
+   * @return The first sticky intent found that matches {@code filter}, or null if there are none.
+   */
+  @UnstableApi
+  @Nullable
+  public static Intent registerReceiverNotExported(
+      Context context, BroadcastReceiver receiver, IntentFilter filter, Handler handler) {
+    if (SDK_INT < 33) {
+      return context.registerReceiver(receiver, filter, /* broadcastPermission= */ null, handler);
+    } else {
+      return context.registerReceiver(
+          receiver,
+          filter,
+          /* broadcastPermission= */ null,
+          handler,
+          Context.RECEIVER_NOT_EXPORTED);
+    }
+  }
+
   /**
    * Calls {@link Context#startForegroundService(Intent)} if {@link #SDK_INT} is 26 or higher, or
    * {@link Context#startService(Intent)} otherwise.

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/AudioBecomingNoisyManager.java

@@ -21,6 +21,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.media.AudioManager;
 import android.os.Handler;
+import androidx.media3.common.util.Util;
 
 /* package */ final class AudioBecomingNoisyManager {
 
@@ -46,8 +47,8 @@ import android.os.Handler;
    */
   public void setEnabled(boolean enabled) {
     if (enabled && !receiverRegistered) {
-      context.registerReceiver(
+      Util.registerReceiverNotExported(
-          receiver, new IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY));
+          context, receiver, new IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY));
       receiverRegistered = true;
     } else if (!enabled && receiverRegistered) {
       context.unregisterReceiver(receiver);

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/StreamVolumeManager.java

@@ -75,7 +75,7 @@ import androidx.media3.common.util.Util;
     VolumeChangeReceiver receiver = new VolumeChangeReceiver();
     IntentFilter filter = new IntentFilter(VOLUME_CHANGED_ACTION);
     try {
-      applicationContext.registerReceiver(receiver, filter);
+      Util.registerReceiverNotExported(applicationContext, receiver, filter);
       this.receiver = receiver;
     } catch (RuntimeException e) {
       Log.w(TAG, "Error registering stream volume receiver", e);

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/AudioCapabilities.java

@@ -88,8 +88,8 @@ public final class AudioCapabilities {
   @SuppressWarnings("InlinedApi")
   public static AudioCapabilities getCapabilities(Context context) {
     Intent intent =
-        context.registerReceiver(
+        Util.registerReceiverNotExported(
-            /* receiver= */ null, new IntentFilter(AudioManager.ACTION_HDMI_AUDIO_PLUG));
+            context, /* receiver= */ null, new IntentFilter(AudioManager.ACTION_HDMI_AUDIO_PLUG));
     return getCapabilities(context, intent);
   }
 

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/AudioCapabilitiesReceiver.java

@@ -90,12 +90,10 @@ public final class AudioCapabilitiesReceiver {
     if (externalSurroundSoundSettingObserver != null) {
       externalSurroundSoundSettingObserver.register();
     }
-    Intent stickyIntent = null;
+    @Nullable Intent stickyIntent = null;
     if (receiver != null) {
       IntentFilter intentFilter = new IntentFilter(AudioManager.ACTION_HDMI_AUDIO_PLUG);
-      stickyIntent =
+      stickyIntent = Util.registerReceiverNotExported(context, receiver, intentFilter, handler);
-          context.registerReceiver(
-              receiver, intentFilter, /* broadcastPermission= */ null, handler);
     }
     audioCapabilities = AudioCapabilities.getCapabilities(context, stickyIntent);
     return audioCapabilities;

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/scheduler/Requirements.java

@@ -184,8 +184,8 @@ public final class Requirements implements Parcelable {
   private boolean isDeviceCharging(Context context) {
     @Nullable
     Intent batteryStatus =
-        context.registerReceiver(
+        Util.registerReceiverNotExported(
-            /* receiver= */ null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
+            context, /* receiver= */ null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
     if (batteryStatus == null) {
       return false;
     }
@@ -203,8 +203,8 @@ public final class Requirements implements Parcelable {
   }
 
   private boolean isStorageNotLow(Context context) {
-    return context.registerReceiver(
+    return Util.registerReceiverNotExported(
-            /* receiver= */ null, new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW))
+            context, /* receiver= */ null, new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW))
         == null;
   }
 

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/scheduler/RequirementsWatcher.java

@@ -111,7 +111,7 @@ public final class RequirementsWatcher {
       filter.addAction(Intent.ACTION_DEVICE_STORAGE_OK);
     }
     receiver = new DeviceStatusChangeReceiver();
-    context.registerReceiver(receiver, filter, null, handler);
+    Util.registerReceiverNotExported(context, receiver, filter, handler);
     return notMetRequirements;
   }