属性动画

public class MainActivity extends AppCompatActivity {

    private ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        img = (ImageView) findViewById(R.id.img);
    }
    public void onClick(View view){
        透明动画
        ObjectAnimator alphaObjectAnimator = new ObjectAnimator().ofFloat(img,"alpha",0f,1f);
        alphaObjectAnimator.setDuration(3000);
        alphaObjectAnimator.start();
        缩放动画
        ObjectAnimator scaleXObjectAnimator = new ObjectAnimator().ofFloat(img,"scaleX",0f,0.5f,1f);
        scaleXObjectAnimator.setDuration(3000);
        scaleXObjectAnimator.start();
        缩放动画
        ObjectAnimator translationXObjectAnimator = new ObjectAnimator().ofFloat(img,"translationX",0f,1000f,0f);
        translationXObjectAnimator.setDuration(3000);
        translationXObjectAnimator.start();
        旋转动画
        ObjectAnimator rotationObjectAnimator = new ObjectAnimator().ofFloat(img,"rotation",0f,-360f,-360f,0f);
        rotationObjectAnimator.setDuration(8000);
        rotationObjectAnimator.start();
        组合动画
        PropertyValuesHolder alphaXPropertyValuesHolder = PropertyValuesHolder.ofFloat("alpha", 0f, 1f);
        PropertyValuesHolder scaleXPropertyValuesHolder = PropertyValuesHolder.ofFloat("scaleX", 1f, 2f);
        ObjectAnimator rotationObjectAnimator = ObjectAnimator.ofPropertyValuesHolder(img, alphaXPropertyValuesHolder, scaleXPropertyValuesHolder);
        rotationObjectAnimator.setDuration(2000);
        rotationObjectAnimator.start();
    }
}