[MIT License] Fixes a leak caused by SemEmergencyManager, see https://github.com/square/leakcanary/issues/762

App.java

public class App extends Application { 
  @Override protected void onCreate(Context context) {
    SemEmergencyManagerLeakingActivity.applyFix(this);
  }
}

SemEmergencyManagerLeakingActivity.java

/** Fixes a leak caused by SemEmergencyManager. Tracked at https://github.com/square/leakcanary/issues/762 */
public final class SemEmergencyManagerLeakingActivity implements Application.ActivityLifecycleCallbacks {
  private Application application;

  private SemEmergencyManagerLeakingActivity(Application application) {
    this.application = application;
  }

  public static void applyFix(Application application) {
    if (MANUFACTURER.equals("samsung") && SDK_INT >= KITKAT && SDK_INT <= N) {
      application.registerActivityLifecycleCallbacks(new SemEmergencyManagerLeakingActivity(application));
    }
  }

  @Override public void onActivityDestroyed(Activity activity) {
    try {
      swapActivityWithApplicationContext();
    } catch (Exception ignored) {
      // the same result is expected on subsequent tries.
    }
    application.unregisterActivityLifecycleCallbacks(this);
  }

  private void swapActivityWithApplicationContext()
      throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
    Class<?> semEmergencyManagerClass = Class.forName("com.samsung.android.emergencymode.SemEmergencyManager");
    Field sInstanceField = semEmergencyManagerClass.getDeclaredField("sInstance");
    sInstanceField.setAccessible(true);
    Object sInstance = sInstanceField.get(null);
    Field mContextField = semEmergencyManagerClass.getDeclaredField("mContext");
    mContextField.setAccessible(true);
    mContextField.set(sInstance, application);
  }

  @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) {}
  @Override public void onActivityStarted(Activity activity) {}
  @Override public void onActivityResumed(Activity activity) {}
  @Override public void onActivityPaused(Activity activity) {}
  @Override public void onActivityStopped(Activity activity) {}
  @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) {}
}

So far this seems to fix the issue. :) GJ

Do you intend this to be open source? If so, what license is it available under? My understanding is that by default gists are copyrighted, not open source, and may not be reproduced or distributed without permission.

galaxy Note 5 ,The problem still exists

If you unregister after one activity is destroyed, does that mean subsequent activities might leak?

If you unregister after one activity is destroyed, does that mean subsequent activities might leak?

sInstance mContext field is updated with application context. other activities use same instance so does not leak.