Android属性动画

这几天看郭神的博客 Android属性动画完全解析(上)，初识属性动画的基本用法之后，我自己突然想实现一种动画功能，就是我们在携程网、阿里旅行等等手机APP端买火车票的时候，看到有选择城市，那么就有出发城市和到达城市，也可以点击“切换”按钮就可以互换城市名，意思就可以买返程票了。你既然要去一个地方，那肯定你也要回来啊。这样就不用再重新选择城市了。点击“切换”的时候有个动画的效果，那我的代码如下：

public class MainActivity extends Activity implements OnClickListener {

    public static final int UPDATE_VIEW = 1;
    private TextView textview_depart_city;
    private TextView textview_arrive_city;
    private Button button;

    private Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case UPDATE_VIEW:
                showCitySwitchRotation();
                break;

            default:
                break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.aimation);
        textview_depart_city = (TextView) findViewById(R.id.tv_departcity);
        textview_arrive_city = (TextView) findViewById(R.id.tv_arrvivecity);
        button = (Button) findViewById(R.id.btn_switch);
        button.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
        case R.id.btn_switch:
            new Thread(new Runnable() {

                @Override
                public void run() {
                    Message message = new Message();
                    message.what = UPDATE_VIEW;
                    handler.sendMessage(message);

                }
            }).start();
            break;
        default:
            break;
        }

    }

    /**
     * 显示城市切换动画
     */
    private void showCitySwitchRotation() {
        float curXDepart = textview_depart_city.getX();
        float curXArrive = textview_arrive_city.getX();
        ObjectAnimator animatorDepart = ObjectAnimator.ofFloat(textview_depart_city, "x", curXArrive);
        ObjectAnimator animatorArraive = ObjectAnimator.ofFloat(textview_arrive_city, "x", curXDepart);
        AnimatorSet animSet = new AnimatorSet();
        animSet.play(animatorDepart).with(animatorArraive);
        animSet.setDuration(1000);
        animSet.start();
        }    
        
    }

用属性动画实现的。代码如下：