Android Handler 防止內存泄漏

public class TestActivity extends AppCompatActivity {
    private Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);

        handler.postDelayed(new Runnable() {
            @Override
            public void run() {

            }
        },10000);
        finish();
    }
}


 public static class MyHandler extends Handler{
        private WeakReference<TestActivity> mActivity;

        public MyHandler(TestActivity activity){
            mActivity = new WeakReference(activity);
        }

        @Override
        public void handleMessage(Message msg) {
            if (mActivity.get() == null) {
                return;
            }

            //接受到消息的處理
        }
    }