android - (AudioManager)getSystemService(Context.AUDIO_SERVICE) 导致内存泄漏

Question

我遇到了由 AudioManager 引起的内存泄漏。所以我在我的代码中注释掉了这一行，看看它是否能解决我的问题:

public class FireRoomActivity extends Activity {

AudioManager am;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
  }
}

它确实解决了问题，我不再有内存泄漏。是因为 Context.AUDIO_SERVICE 吗？如果是，我该如何更换它？

如果重要的话，我的 Activity 中有这个非静态类，它不会在外部其他地方使用

class GestureListener extends GestureDetector.SimpleOnGestureListener {
RelativeLayout parentLayout;

public void setLayout(RelativeLayout layout){
    parentLayout = layout;  }
@Override
public boolean onDown(MotionEvent e) {
    return true;
}
// event when double tap occurs
@Override
public boolean onDoubleTap(MotionEvent e) {     
    makeArrowsVisible();
    parentLayout.findViewById(R.id.cabinet_zoomed).setVisibility(View.INVISIBLE);
    Button key = (Button)parentLayout.findViewById(R.id.key);
    if(key!=null){
        key.setVisibility(View.INVISIBLE);}
    return true;
}

编辑:堆转储的屏幕截图

Answer 1

https://gist.github.com/jankovd/891d96f476f7a9ce24e2 中提到的修复为我工作。

public class ActivityUsingVideoView extends Activity {

  @Override protected void attachBaseContext(Context base) {
    super.attachBaseContext(AudioServiceActivityLeak.preventLeakOf(base));
  }
}


/**
 * Fixes a leak caused by AudioManager using an Activity context. 
 * Tracked at https://android-review.googlesource.com/#/c/140481/1 and
 * https://github.com/square/leakcanary/issues/205
 */
public class AudioServiceActivityLeak extends ContextWrapper {

  AudioServiceActivityLeak(Context base) {
    super(base);
  }

  public static ContextWrapper preventLeakOf(Context base) {
    return new AudioServiceActivityLeak(base);
  }

  @Override public Object getSystemService(String name) {
    if (Context.AUDIO_SERVICE.equals(name)) {
      return getApplicationContext().getSystemService(name);
    }
    return super.getSystemService(name);
  }
}

感谢 Dejan Jankov :)