ObjectAnimator属性动画应用demo

package com.example.animationapp;

import java.util.ArrayList;
import java.util.List;

import android.support.v7.app.ActionBarActivity;
import android.animation.ObjectAnimator;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.BounceInterpolator;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener {

private int[] res = {R.id.im0, R.id.im1,R.id.im2,
R.id.im3,R.id.im4,R.id.im5,R.id.im6,R.id.im7};

private List<ImageView>  list = new ArrayList<ImageView>();

private boolean flag = true;

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

initView();
}

private void initView() {

for(int i = 0; i < res.length; i++){
ImageView im = (ImageView) findViewById(res[i]);
im.setOnClickListener(this);
list.add(im);
}
}

@Override
public void onClick(View v) {
switch(v.getId()){
//im7最后布局，叠加在最上面
case R.id.im7:{

if(flag){
startAnimation();
flag = false;
}else{
closeAnimation();
flag = true;
}
break;
}

default:
Toast.makeText(MainActivity.this, v.getId()+"OK", Toast.LENGTH_SHORT).show();
break;
}
}

private void closeAnimation() {
for(int i = 0 ;i<res.length-1; i++){
ObjectAnimator oa = ObjectAnimator.ofFloat(list.get(i),
"translationY",i*200F, 0F );
oa.setDuration(100);
//oa.setStartDelay(50*i);
oa.start();
}
}

private void startAnimation() {
//此处只需要弹出其余7个图标，最上边的图标im7不动
for(int i = 0 ;i<res.length-1; i++){
//属性动画操作类
ObjectAnimator oa = ObjectAnimator.ofFloat(list.get(i),
"translationY", 0F, i*200F);
oa.setDuration(200);
//oa.setInterpolator(new BounceInterpolator());
//oa.setStartDelay(200*i);
oa.start();
}
}

}