Android 自定义View实现专辑图片不停旋转

package com.example.hsaetest;

import android.content.Context;
import android.graphics.Canvas;
import android.os.Handler;
import android.util.AttributeSet;
import android.widget.ImageView;

public class RotateView extends ImageView {
private float degree;
private int centerX, centerY;
private Handler handler = new Handler();
private Runnable runnable = new Runnable() {

@Override
public void run() {
degree += 2f;
if (degree > 360f) {
degree -= 360f;
}
invalidate();
handler.postDelayed(this, 16l);
}
};

public RotateView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public void start() {
handler.post(runnable);
}

public void pause() {
handler.removeCallbacks(runnable);
}

public void destroy() {
handler.removeCallbacksAndMessages(null);
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
centerX = getWidth() / 2;
centerY = getHeight() / 2;
}

@Override
public void draw(Canvas canvas) {
canvas.save();
canvas.rotate(degree, centerX, centerY);
super.draw(canvas);
canvas.restore();
}

@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
handler.removeCallbacksAndMessages(null);
}
}