Handler 弱引用

private static class MyHandle extends Handler {
    WeakReference<Activity> weakReference;

    public MyHandle(Activity activity) {
        weakReference = new WeakReference<Activity>(activity);
    }

    @Override
    public void handleMessage(Message msg) {
        Activity activity = weakReference.get();
        if (activity != null && activity instanceof TestMainActivity) {
            switch (msg.what) {
                case START_RECORD:
                    isListener = true;
                    fileRecod = FileUtil.createFile("test.amr");
                    if (fileRecod != null) {
                        startRecord();
                    }
                    break;
                default:
                    break;
            }
            super.handleMessage(msg);
        }
    }

}


@Override
protected void onDestroy() {
    super.onDestroy();
    if (myHandle != null) {
        myHandle.removeCallbacksAndMessages(null);
    }
}


                Message msg = myHandle.obtainMessage();
                msg.what = START_RECORD;
                myHandle.sendMessage(msg);