经过这两天对ObjectAnimator属性动画的学习，基本对Android提供的属性动画有了一定的认识，现在就为大家以一个类似扇形打开的效果做总结。
效果图：
下面就让我们用刚刚学到的属性动画效果，来实现上述的效果；首先我们需要准备8张小图标，将他们放到res目录下的drawable文件中，下面就是布局文件，布局文件很简单，就是把这8张小图标使用ImageView引入到界面中，需要注意的就是把做为开关的图标，放到最下面，下面就看一下具体的实现：
/**
* 属性动画综合小例子
* Created by Administrator on 2015/2/14.
*/
public class ThreeActivity extends Activity implements View.OnClickListener{
private int[] image = {R.id.imageA, R.id.imageB, R.id.imageC, R.id.imageD, R.id.imageE, R.id.imageF, R.id.imageG, R.id.imageH};
private String[] str = {"开关","相机","音乐","地址","月亮","个人信息","定位","短信"};
private List<ImageView> list = new ArrayList<ImageView>();
private Boolean flag = true;//图标打开、关闭控制
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_three);
init();
} public void init(){
for(int i = 0; i<image.length; i++){
ImageView imageView = (ImageView)findViewById(image[i]);
imageView.setOnClickListener(this);
list.add(imageView);
}
} @Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.imageA:
if(flag) {
startanim();//打开
}else{
closeanim();//收起
}
break;
case R.id.imageB:
Toast.makeText(this, str[1], Toast.LENGTH_SHORT).show();
break;
case R.id.imageC:
Toast.makeText(this, str[2], Toast.LENGTH_SHORT).show();
break;
case R.id.imageD:
Toast.makeText(this, str[3], Toast.LENGTH_SHORT).show();
break;
case R.id.imageE:
Toast.makeText(this, str[4], Toast.LENGTH_SHORT).show();
break;
case R.id.imageF:
Toast.makeText(this, str[5], Toast.LENGTH_SHORT).show();
break;
case R.id.imageG:
Toast.makeText(this, str[6], Toast.LENGTH_SHORT).show();
break;
case R.id.imageH:
Toast.makeText(this, str[7], Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
//打开隐藏的图标
public void startanim(){
for(int i = list.size()-1, j = 0; i >= 0; i--,j++){
ObjectAnimator animator = ObjectAnimator.ofFloat(list.get(i), "translationY", 0F, i*80F);
animator.setDuration(500);//持续时间
animator.setInterpolator(new BounceInterpolator());//自由落体效果
animator.setStartDelay(j * 100);//间隔时间
animator.start();
}
flag = false;
}
//关闭打开的图标
public void closeanim(){
for(int i = 0; i < list.size(); i++){
ObjectAnimator animator = ObjectAnimator.ofFloat(list.get(i), "translationY", i*80F, 0F);
animator.setDuration(500);
animator.setStartDelay(i * 100);
animator.start();
}
flag = true;
}
}
对于代码中的不易理解部分，我已进行了注释，相信大家一看便可以理解。最后为大家附一张实习后的效果：