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);    }}