【Animation】 使用handler和Runnable实现某一个控件的抖动效果

布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#000000">

<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:text="Hello!"/>
</LinearLayout>

代码： 使用handler的postDelayed方法每半秒钟发送一个消息来执行动画效果，同时在handler里面使动画平移的距离缩短，当距离为零时就通过handler的
removeCallbacks方法取消runnable正在执行的操作！
每一次点击按钮都重置一下动画的距离，并且开启runnable，执行操作！

package com.example.viewpager;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.TranslateAnimation;
import android.widget.Button;public class MainActivity extends Activity {
private Button btn;
private int length;
Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 0:
length -= 2.5;
TranslateAnimation animation = new TranslateAnimation(0,length , 0, 0);
animation.setDuration(50);
Log.i("----", length+"");
btn.startAnimation(animation);
if(length==0){
handler.removeCallbacks(runnable);
}
break;default:
break;
}
};
};
Runnable runnable = new Runnable() {
public void run() {
handler.sendEmptyMessage(0);
handler.postDelayed(this, 80);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
length = 30;
handler.post(runnable);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}}