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：