Android实现抽奖转盘实例代码

 import android.app.Activity; import android.content.Context; import android.graphics.BlurMaskFilter; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.ColorMatrixColorFilter; import android.graphics.EmbossMaskFilter; import android.graphics.MaskFilter; import android.graphics.Paint; import android.graphics.PorterDuffXfermode; import android.graphics.Paint.Style; import android.graphics.PorterDuff.Mode; import android.graphics.Path; import android.graphics.RadialGradient; import android.graphics.RectF; import android.graphics.Shader.TileMode; import android.util.AttributeSet; import android.util.TypedValue; import android.view.View; public class SlyderView extends View{ public SlyderView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } public SlyderView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public SlyderView(Context context) { super(context); init(context); } /** * 屏幕宽度 */ private int screenW; /** * 屏幕的高度 */ private int screenH; /** * 分割的度数 */ private int [] drgrees = {20,50,40,90,70,40,50}; /*** * 分割的文字 */ private String [] strs = {"level1","level2","level3","level4","level5","level6","level7"}; /** * 分割的颜色 */ private int [] colos = new int[] { 0xfed9c960, 0xfe57c8c8, 0xfe9fe558, 0xfef6b000, 0xfef46212, 0xfecf2911, 0xfe9d3011 }; /** * 画笔 */ private Paint paint; /** * 文字的大小 */ private float textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 15, getResources().getDisplayMetrics()); /** * 文字的颜色 */ private int textcolor = Color.WHITE; /** * 园的半径 */ private float radius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 100, getResources().getDisplayMetrics()); /** * 画文字的距离 */ private float textdis = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 80, getResources().getDisplayMetrics()); /** * 画箭头的大小 */ private float roketSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 10, getResources().getDisplayMetrics()); private float initDegress = 0; /** * 圆心 */ private float centerX; /** * 圆心 */ private float centerY; /** * 立体边缘 */ private MaskFilter filter = new EmbossMaskFilter(new float[] { 1, 1, 1 },0.4f, 6, 3.5f); private MaskFilter outerFilter = new BlurMaskFilter(10, BlurMaskFilter.Blur.OUTER); private MaskFilter innerFilter = new BlurMaskFilter(10, BlurMaskFilter.Blur.INNER); @SuppressWarnings("deprecation") private void init(Context context){ paint = new Paint(); paint.setAntiAlias(true); paint.setStyle(Style.FILL); paint.setColor(Color.WHITE); screenW = ((Activity)context).getWindowManager().getDefaultDisplay().getWidth(); screenH = ((Activity)context).getWindowManager().getDefaultDisplay().getHeight(); int[] colores = new int[3]; colores[0] = Color.rgb(0xfF, 0x99, 0x00); colores[1] = Color.rgb(0xff, 0xff, 0x00); colores[2] = Color.rgb(0xff, 0x99, 0x00); float[] positions = new float[3]; positions[0] = 0.0f; positions[1] = 0.5f; positions[2] = 1.0f; gradient = new RadialGradient(centerX, centerY, radius/5, colores, positions, TileMode.CLAMP); } /** * 绘制三角箭头 */ private Path path = new Path(); /** * 绘制矩形框 */ private RectF oval; /** * 外圆内阴影矩阵 */ private ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(new float[]{ 1,0,0,0,0, 0,1,0,0,0, 0,0,1,0,0, 0,0,0,-1,255 }); @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); centerX = screenW/2; centerY = screenH/2; oval = new RectF(centerX-radius,centerY-radius,centerX+radius,centerY+radius); float start = 0; paint.setColor(Color.rgb(0xdd, 0xdd, 0xdd)); paint.setAlpha(127); canvas.drawCircle(centerX, centerY, radius+10, paint); paint.setAlpha(255); //画扇形 paint.setAntiAlias(true); for(int i=0;i=360){ initDegress = 0; } initDegress +=4; invalidate(); } if(isStoping){ if(initDegress<=360){ initDegress+=4; invalidate(); }else{ if(initDegress-360