如何在ViewPropertyAnimator中重复动画？

Question

有人知道如何在ViewPropertyAnimator中制作重复的动画吗？

我尝试过所有方法，但都不起作用，ViewPropertyAnimator不接受其他类型动画的方法

Answer 1

在调用start()之前包装ViewPropertyAnimator可以做到这一点。下面我写了一个包装类，它将在动画结束时重复动画。您可以修改该类以满足您的需要。

package main.java.app.com.animation;
import android.animation.Animator;
import android.support.v4.view.ViewPropertyAnimatorListener;
import android.view.ViewPropertyAnimator;

/**
 * Created by nikola on 9/7/14.
 */
public class RepeatableViewPropertyAnimatorWrapper implements Animator.AnimatorListener {

    private static RepeatableViewPropertyAnimatorWrapper mInstance;
    private  ViewPropertyAnimator mViewPropertyAnimator;
    private Animator.AnimatorListener mViewPropertyAnimatorListener;
    private boolean willRepeat = true;
    private Animator mCurrentAnimator;

    public static RepeatableViewPropertyAnimatorWrapper wrap(ViewPropertyAnimator animator){
        mInstance = new RepeatableViewPropertyAnimatorWrapper(animator);
        return mInstance; 
    }
    public static RepeatableViewPropertyAnimatorWrapper withAnimatorListener(Animator.AnimatorListener animatorListener){
            mInstance.setAnimatorListener(animatorListener);
        return mInstance;
    }
    private void setAnimatorListener(Animator.AnimatorListener animatorListener) {
        mViewPropertyAnimatorListener = animatorListener;
    }

    public RepeatableViewPropertyAnimatorWrapper(ViewPropertyAnimator animator){
        mViewPropertyAnimator = animator;
    }
    public RepeatableViewPropertyAnimatorWrapper(ViewPropertyAnimator animator, Animator.AnimatorListener animatorListener){
        mViewPropertyAnimator = animator;
        mViewPropertyAnimatorListener = animatorListener;
    }
    public boolean isRepeating() {
        return willRepeat;
    }

    public void setRepeat(boolean willRepeat) {
        this.willRepeat = willRepeat;
    }

    private void setup(){
        mViewPropertyAnimator.setListener(this);
    }

    @Override
    public void onAnimationStart(Animator animation) {
        mCurrentAnimator = animation;
        if(mViewPropertyAnimatorListener != null){
            mViewPropertyAnimatorListener.onAnimationStart(animation);
        }
    }

    @Override
    public void onAnimationEnd(Animator animation) {
        if(mViewPropertyAnimatorListener != null){
            mViewPropertyAnimatorListener.onAnimationEnd(animation);
        }
        repeatAnimation();

    }
    public void start(){
        mViewPropertyAnimator.start();
    }

    private void repeatAnimation() {
        if(willRepeat){
            start();
            onAnimationRepeat(mCurrentAnimator);
        }
        mInstance = null;

    }

    @Override
    public void onAnimationCancel(Animator animation) {
        if(mViewPropertyAnimatorListener != null){
            mViewPropertyAnimatorListener.onAnimationCancel(animation);
        }
    }

    @Override
    public void onAnimationRepeat(Animator animation) {
        if(mViewPropertyAnimatorListener != null){
            mViewPropertyAnimatorListener.onAnimationRepeat(animation);
        }

    }

用法：

RepeatableViewPropertyAnimatorWrapper.wrap(view.animate().alpha(0).setDuration(500)).withAnimatorListener(myListener).start();

请注意，我没有测试这段代码，请记住，根据ViewPropertyAnimator实现的不同，设置值可能会发生变化。