Android自定义View实现抽奖转盘

public class LuckCircle extends SurfaceView implements SurfaceHolder.Callback,Runnable {
 
 private SurfaceHolder mHolder;
 
 private Canvas mCanvas;
 
 //用于绘制的线程
 
 private Thread mThread;
 
 //线程开关的控制
 
 private boolean isRunning;
 
 private String[] mStr = new String[]{"优惠券","十元话费","恭喜发财","恭喜发财","英雄皮肤","50M流量"};

 //物品的图片
 
 private int[] mImgs = new int[]{R.mipmap.ic_launcher,
 R.mipmap.ic_launcher,R.mipmap.ic_launcher,
 R.mipmap.ic_launcher,R.mipmap.ic_launcher,R.mipmap.ic_launcher};
 
 private int mItemCount = 6;
 
 //盘快的颜色
 
 private int[] mColor = new int[]{0xffffc300,0xFFD9B114,0xFFDC0B2E,0xFF5510A4,0xFF447C42,0xFFEC3636};

 //与图片对应的bitmap数组
 
 private Bitmap[] mImgBitmap;

 //整个盘块的范围
 
 private RectF mRange = new RectF();
 
 //整个盘块的直径

 private int mRadius;
 
 
 //绘制盘块的画笔
 
 private Paint mArcPaint;
 
 
 //绘制文本的画笔
 
 private Paint mTextPaint;
 
 //滚动速度
 
 private double mSpeed = 10;
 
 
 //绘制的角度

 private volatile int mStartAngle = 0;
 
 
 //判断是否点击了停止按钮
 
 private boolean isShouldEnd;
 
 
 //转盘的中心位置

 private int mCenter;
 
 //padding取四个padding中的最小值
 
 private int mPadding;
 
 //背景图
 
 //private Bitmap mBgBitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher);
 
 private float mTextSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,20,getResources().getDisplayMetrics());
 public LuckCircle(Context context) {
 this(context,null);
 }
 
 public LuckCircle(Context context, AttributeSet attrs) {
 super(context, attrs);
 mHolder = getHolder();
 mHolder.addCallback(this);
 // 可获得焦点
 setFocusable(true);
 setFocusableInTouchMode(true);
 // 设置常亮
 setKeepScreenOn(true);
 }
 
 
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 int width = Math.min(getMeasuredWidth(),getMeasuredHeight());
 
 mPadding = getPaddingLeft();
 
 mRadius = width - mPadding *2;
 
 mCenter = width / 2;
 setMeasuredDimension(width,width);
 }
 
 @Override
 public void surfaceCreated(SurfaceHolder holder) {
 // 初始化绘制盘块的画笔
 mArcPaint = new Paint();
 mArcPaint.setAntiAlias(true);
 mArcPaint.setDither(true);
 
 // 初始化绘制盘块的画笔
 mTextPaint = new Paint();
 mTextPaint.setColor(0XFF0B25CF);
 mTextPaint.setTextSize(mTextSize);
 
 // 初始化盘块绘制的范围
 mRange = new RectF(mPadding,mPadding,mPadding+mRadius,mPadding+mRadius);
 
 // 初始化图片
 mImgBitmap = new Bitmap[mItemCount];
 for (int i = 0; i < mImgBitmap.length; i++) {
 mImgBitmap[i] = BitmapFactory.decodeResource(getResources(),mImgs[i]);
 }
 isRunning = true;
 mThread = new Thread(this);
 mThread.start();
 }
 
 @Override
 public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
 
 }
 
 @Override
 public void surfaceDestroyed(SurfaceHolder holder) {
 isRunning = false;
 
 }
 
 @Override
 public void run() {
 while(isRunning){
 long start = System.currentTimeMillis();
 draw();
 long end = System.currentTimeMillis();
 if (end - start < 50) {
 try {
 Thread.sleep(50 - (end - start));
 } catch (InterruptedException e) {
 e.printStackTrace();
 }
 }
 }
 }
 private void draw(){
 try {
 mCanvas = mHolder.lockCanvas();
 if (mCanvas != null) {
 // 绘制背景
 drawBackground();
 // 绘制盘块
 float tmpAngle = mStartAngle;
 float sweepAngle = 360 /mItemCount;
 for (int i = 0; i < mItemCount; i++) {
 mArcPaint.setColor(mColor[i]);
 // 绘制盘块
 mCanvas.drawArc(mRange,tmpAngle,sweepAngle,true,mArcPaint);
 
 // 绘制文本
 drawText(tmpAngle,sweepAngle,mStr[i]);
 // 绘制Icon
 drawIcon(tmpAngle,mImgBitmap[i]);
 tmpAngle += sweepAngle;
 }
 mStartAngle += mSpeed;
 // 如果点击了停止按钮
 if (isShouldEnd) {
 mSpeed -= 1;
 }
 if (mSpeed <= 0) {
 mSpeed = 0;
 isShouldEnd = false;
 }
 }
 }catch (Exception e){
 
 }finally {
 if (mCanvas != null) {
 // 释放Canvas
 mHolder.unlockCanvasAndPost(mCanvas);
 }
 }
 }
 
 
 //点击启动旋转
 
 public void luckyStart(){
 mSpeed = 50;
 isShouldEnd = false;
 }
 public void luckEnd(){
 isShouldEnd = true;
 }
 public boolean isStart(){
 return mSpeed != 0;
 }
 public boolean isShouldEnd(){
 return isShouldEnd;
 }
 
 //绘制Icon
 
 private void drawIcon(float tmpAngle, Bitmap bitmap) {
 // 设置图片的宽度为直径的1/8；
 int imgWidth = mRadius / 8;
 
 float angle = (float) ((tmpAngle + 360 / mItemCount / 2)* Math.PI/180);
 
 int x = (int) (mCenter + mRadius/2/2 * Math.cos(angle));
 int y = (int) (mCenter + mRadius/2/2 * Math.sin(angle));
 // 确定图片的位置
 Rect rect = new Rect(x - imgWidth/2, y - imgWidth/2, x + imgWidth/2, y + imgWidth/2);
 mCanvas.drawBitmap(bitmap,null,rect,null);
 
 }
 
 
 //绘制每个盘块的文本
 
 private void drawText(float tmpAngle, float sweepAngle, String s) {
 Path path = new Path();
 path.addArc(mRange,tmpAngle,sweepAngle);
 // 利用水平偏移量让文字居中
 float measureText = mTextPaint.measureText(s);
 int hOffset = (int) (mRadius * Math.PI/mItemCount/2 - measureText/2);
 int vOffset = mRadius /2/6;
 mCanvas.drawTextOnPath(s,path,hOffset,vOffset,mTextPaint);
 }
 
 private void drawBackground() {
 mCanvas.drawColor(0xFF696565);
 Paint paint = new Paint();
 paint.setColor(0xFFF94905);
 mCanvas.drawCircle(getWidth()/2,getHeight()/2,getWidth()/2,paint);
 
 }
}