属性动画

   属性动画会改变控件真实的坐标 

   如果使用xml方式定义属性动画 要在res下创建一个animator目录

 

public class MainActivity extends Activity {

    private ImageView iv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //加载的布局
        setContentView(R.layout.activity_main);
        
        //找到iv 执行动画
        iv = (ImageView) findViewById(R.id.iv);
        //设置了一个点击事件
        iv.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                
                Toast.makeText(MainActivity.this, "你点不到我", 0).show();
            }
        });
        

//        iv.setTranslationX(translationX)
//        iv.setScaleX(scaleX)
//        iv.setAlpha(alpha)
//        iv.setRotation(rotation)
        
        
    }

    //位移动画
    public void translate(View v){
        //创建属性动画
        /**
         * target 执行的目标  
         * propertyName 属性名字  The name of the property being animated.
         * float... values 可变参数 
         */
        ObjectAnimator oa = ObjectAnimator.ofFloat(iv, "translationX", 10, 50,20,100);
        oa.setDuration(2000);
        oa.start(); //开始动画
        
    }
    //缩放动画
    public void scale(View v){
        
        ObjectAnimator oa = ObjectAnimator.ofFloat(iv, "scaleY", 0.1f, 2, 1, 2);
        oa.setDuration(2000);
        oa.start();
    }
    
    //实现透明的效果 
    public void alpha(View v){
        ObjectAnimator oa = ObjectAnimator.ofFloat(iv, "alpha", 0, 0.5f, 0, 1,0,1);
        oa.setDuration(2000);
        oa.start();
    }
    
    //实现旋转的效果
    public void rotate(View v){
//        ObjectAnimator oa = ObjectAnimator.ofFloat(iv, "rotation", 0, 180, 90, 360);
        ObjectAnimator oa = ObjectAnimator.ofFloat(iv, "rotationX", 0, 180, 90, 360);
        oa.setDuration(2000);
        oa.start();
    }
    
    
    //一起飞 
    public void fly(View v){
        AnimatorSet as = new AnimatorSet();
        ObjectAnimator oa = ObjectAnimator.ofFloat(iv, "translationX", 10, 50, 20, 100);
        ObjectAnimator oa2 = ObjectAnimator.ofFloat(iv, "scaleY", 0.1f, 2, 1, 2);
        ObjectAnimator oa3 = ObjectAnimator.ofFloat(iv, "alpha", 0, 0.5f, 0, 1);
        ObjectAnimator oa4 = ObjectAnimator.ofFloat(iv, "rotationY", 0, 180, 90, 360);
        as.setDuration(2000);//执行动画时长
        as.setTarget(iv);//iv执行动画
        //往集合中添加动画
        //挨个飞
        as.playSequentially(oa, oa2, oa3, oa4);
        //一起飞
//        as.playTogether(oa, oa2, oa3, oa4);
        as.start();
    }
    
    //使用xml的方式创建属性动画
    public void playxml(View v){
        
        ObjectAnimator oa = (ObjectAnimator) AnimatorInflater.loadAnimator(this, R.animator.oanimator);
        //设置执行目标
        oa.setTarget(iv);
        oa.start();//开始执行
    }
}

oanimator.xml

<?xml version="1.0" encoding="utf-8"?>
<animator xmlns:android="http://schemas.android.com/apk/res/android" >
    <objectAnimator 
        android:propertyName="translationX"
        android:duration="2000"
        android:valueFrom="10"
        android:valueTo="100"
        ></objectAnimator>

</animator>