public class LuckCircle extends SurfaceView implements SurfaceHolder.Callback,Runnable {  private SurfaceHolder mHolder;  private Canvas mCanvas;  //用于繪制的線程  private Thread mThread;  //線程開關的控制  private boolean isRunning;  private String[] mStr = new String[]{"優惠券","十元話費","恭喜發財","恭喜發財","英雄皮膚","50M流量"}; //物品的圖片  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;  //盤快的顏色  private int[] mColor = new int[]{0xffffc300,0xFFD9B114,0xFFDC0B2E,0xFF5510A4,0xFF447C42,0xFFEC3636}; //與圖片對應的bitmap數組  private Bitmap[] mImgBitmap; //整個盤塊的范圍  private RectF mRange = new RectF();  //整個盤塊的直徑 private int mRadius;   //繪制盤塊的畫筆  private Paint mArcPaint;   //繪制文本的畫筆  private Paint mTextPaint;  //滾動速度  private double mSpeed = 10;   //繪制的角度 private volatile int mStartAngle = 0;   //判斷是否點擊了停止按鈕  private boolean isShouldEnd;   //轉盤的中心位置 private int mCenter;  //padding取四個padding中的最小值  private int mPadding;  //背景圖  //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); // 可獲得焦點 setFocusable(true); setFocusableInTouchMode(true); // 設置常亮 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) { // 初始化繪制盤塊的畫筆 mArcPaint = new Paint(); mArcPaint.setAntiAlias(true); mArcPaint.setDither(true);  // 初始化繪制盤塊的畫筆 mTextPaint = new Paint(); mTextPaint.setColor(0XFF0B25CF); mTextPaint.setTextSize(mTextSize);  // 初始化盤塊繪制的范圍 mRange = new RectF(mPadding,mPadding,mPadding+mRadius,mPadding+mRadius);  // 初始化圖片 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) { // 繪制背景 drawBackground(); // 繪制盤塊 float tmpAngle = mStartAngle; float sweepAngle = 360 /mItemCount; for (int i = 0; i < mItemCount; i++) { mArcPaint.setColor(mColor[i]); // 繪制盤塊 mCanvas.drawArc(mRange,tmpAngle,sweepAngle,true,mArcPaint);  // 繪制文本 drawText(tmpAngle,sweepAngle,mStr[i]); // 繪制Icon drawIcon(tmpAngle,mImgBitmap[i]); tmpAngle += sweepAngle; } mStartAngle += mSpeed; // 如果點擊了停止按鈕 if (isShouldEnd) { mSpeed -= 1; } if (mSpeed <= 0) { mSpeed = 0; isShouldEnd = false; } } }catch (Exception e){  }finally { if (mCanvas != null) { // 釋放Canvas mHolder.unlockCanvasAndPost(mCanvas); } } }   //點擊啟動旋轉  public void luckyStart(){ mSpeed = 50; isShouldEnd = false; } public void luckEnd(){ isShouldEnd = true; } public boolean isStart(){ return mSpeed != 0; } public boolean isShouldEnd(){ return isShouldEnd; }  //繪制Icon  private void drawIcon(float tmpAngle, Bitmap bitmap) { // 設置圖片的寬度為直徑的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)); // 確定圖片的位置 Rect rect = new Rect(x - imgWidth/2, y - imgWidth/2, x + imgWidth/2, y + imgWidth/2); mCanvas.drawBitmap(bitmap,null,rect,null);  }   //繪制每個盤塊的文本  private void drawText(float tmpAngle, float sweepAngle, String s) { Path path = new Path(); path.addArc(mRange,tmpAngle,sweepAngle); // 利用水平偏移量讓文字居中 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);  }}