Android实现网易云音乐的旋转专辑View

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// 设置旋转动画(属性动画)
private void init(Context context) {
  View.inflate(context, R.layout.view_rotate_album, this);
  ivAlbumPic = (ImageView) findViewById(R.id.view_pic);
  animator = ObjectAnimator.ofFloat(ivAlbumPic, "rotation", 0.0F, 360.0F);
  animator.setDuration(10 * 1000);
  animator.setInterpolator(new LinearInterpolator());
  animator.setRepeatCount(ObjectAnimator.INFINITE);
  animator.setRepeatMode(ValueAnimator.RESTART);
  setPlaying(true);
 }

 // 更新播放状态
 public void setPlaying(boolean isPlaying) {
  Log.d(TAG, "update RotateAlbumView: isPlaying = " + isPlaying);
  if (isPlaying) {
   if (!animator.isRunning()) {
    animator.start();
   } else {
    animator.resume();
   }
  } else {
   if (!animator.isStarted() || !animator.isRunning()) {
    animator.cancel();
   }
   animator.pause();
  }
}

public class WidgetAlbumBgView extends View {
 private Paint paint;
 // 圆环半径
 private int ringWidth;
 // 渐变色
 private int[] colors;
 private SweepGradient gradient;
 // 圆线距圆环内边的距离
 private int[] ringLinesMarginOut = {
   dp2px(3.78F),
   dp2px(7.03F),
   dp2px(10.27F),
   dp2px(12.97F)
 };
 // 圆线高度
 private int ringLineWidth;

 public WidgetAlbumBgView(Context context) {
  this(context, null);
 }

 public WidgetAlbumBgView(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public WidgetAlbumBgView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init(context, attrs);
 }

 private void init(Context context, AttributeSet attrs) {
  paint = new Paint();
  paint.setAntiAlias(true);
  paint.setStyle(Paint.Style.STROKE);
  paint.setStrokeCap(Paint.Cap.ROUND);
  colors = new int[]{getColor(R.color.widget_album_ring_color1), getColor(R.color.widget_album_ring_color2),
    getColor(R.color.widget_album_ring_color1), getColor(R.color.widget_album_ring_color2),
    getColor(R.color.widget_album_ring_color1)};

  TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.WidgetAlbumBgView);
  ringWidth = (int) typedArray.getDimension(R.styleable.WidgetAlbumBgView_ring_width, getResources().getDimension(R.dimen.widget_album_ring_width));
  ringLineWidth = (int) typedArray.getDimension(R.styleable.WidgetAlbumBgView_ring_line_width, getResources().getDimension(R.dimen.widget_album_ring_line_width));
  typedArray.recycle();
 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  paint.setStrokeWidth(ringWidth);
  paint.setColor(getColor(R.color.widget_album_ring_color1));
  if (gradient == null) {
   gradient = new SweepGradient(getWidth() * 0.5F, getHeight() * 0.5F, colors, new float[]{
     0F, 0.25F, 0.5F, 0.75F, 1F
   });
  }
  paint.setShader(gradient);
  // 画圆环
  canvas.drawCircle(getWidth() * 0.5F, getHeight() * 0.5F, (getWidth() - ringWidth) * 0.5F, paint);
  paint.setShader(null);
  paint.setStrokeWidth(ringLineWidth);
  paint.setColor(getColor(R.color.widget_album_ring_line_color));
  // 画圆线
  for (int marginOut : ringLinesMarginOut) {
   canvas.drawCircle(getWidth() * 0.5F, getHeight() * 0.5F, getWidth() * 0.5F - marginOut - ringLineWidth * 0.5F, paint);
  }
 }

}