Android 之Handler是如何正确使用

public class MainActivity extends BaseActivity {

    //声明
    private ButtonStateHandler mHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding = ActivityMainBinding.inflate(getLayoutInflater());
        //初始化
        mHandler = new ButtonStateHandler(new WeakReference<>(this));
        setContentView(mBinding.getRoot());
    }

    /**
     * Handler的正确写法
     */
     public static class ButtonStateHandler extends Handler {
        private WeakReference<MainActivity> mWeakReference;

        public ButtonStateHandler(WeakReference<MainActivity> activity) {
            this.mWeakReference = activity;
        }

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1001:
                    mWeakReference.get().mBinding.btnSendOrder.setText((String) msg.obj);
                    break;
                default:
                    break;
            }
        }
    }

    /**
     * Handler销毁
     */
    @Override
    protected void onDestroy() {
        super.onDestroy();
        mHandler.removeCallbacksAndMessages(null);
    }
}