前言

大家在音乐类app中，经常看到类似唱片的旋转动画。如何利用属性动画 ObjectAnimator和补间动画 RotateAnimation 分别实现这一效果呢？

用ObjectAnimator实现

直接上代码
public class MyActivity extends Activity {

@BindView(R.id.id_iv_cover)
CircleImageView idIvCover;

private ObjectAnimator mAnimator;
public static final int STATE_PLAYING = 1;//正在播放
public static final int STATE_PAUSE = 2;//暂停
public static final int STATE_STOP = 3;//停止
public int mState;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
protected void initView() {
    setContentView(R.layout.activity_my);
    ButterKnife.bind(this);
    
    initAnimator();

    idIvCover.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            playMusic();
        }
    });
}

public void playMusic() {
    if (mState == STATE_STOP) {
        mAnimator.start();//动画开始
        mState = STATE_PLAYING;
    } else if (mState == STATE_PAUSE) {
        mAnimator.resume();//动画重新开始
        mState = STATE_PLAYING;
    } else if (mState == STATE_PLAYING) {
        mAnimator.pause();//动画暂停
        mState = STATE_PAUSE;
    }
}

private void initAnimator() {
    mState = STATE_STOP;
    mAnimator = ObjectAnimator.ofFloat(idIvCover, "rotation", 0.0f, 360.0f);
    mAnimator.setDuration(5000);//设定转一圈的时间
    mAnimator.setRepeatCount(Animation.INFINITE);//设定无限循环
    mAnimator.setRepeatMode(ObjectAnimator.RESTART);// 循环模式
    mAnimator.setInterpolator(new LinearInterpolator());// 匀速
}

}