AndroidHandler内存泄漏原因及解决方案

  //匿名内部类  
  Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
    }
  };

  //非静态内部类
  protected class AppHandler extends Handler {

    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
        // TODO: 2019/4/30 
      }
    }
  }

  // 清空消息队列，移除对外部类的引用
  @Override
  protected void onDestroy() {
    super.onDestroy();
    mHandler.removeCallbacksAndMessages(null);

  }

 
  //Handler源码中removeCallbacksAndMessages()注释含义
  /**
   * Remove any pending posts of callbacks and sent messages whose
   * obj is token. If token is null,
   * all callbacks and messages will be removed.
   */
  public final void removeCallbacksAndMessages(Object token) {
    mQueue.removeCallbacksAndMessages(this, token);
  }

  private static class AppHandler extends Handler {
    //弱引用，在垃圾回收时，被回收
    WeakReference activity;

    AppHandler(Activity activity){
      this.activity=new WeakReference(activity);
    }

    public void handleMessage(Message message){
      switch (message.what){
        //todo
      }
    }
  }