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