android 转盘抽奖 示例源码

package com.hr.nipuream.luckpan.view; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.text.TextUtils; import android.util.AttributeSet; import android.view.View; import android.widget.ImageView; import android.widget.RelativeLayout; import com.hr.nipuream.luckpan.util.Logger; import com.hr.nipuream.luckpan.util.Util; public class LuckPanLayout extends RelativeLayout { private Context context; private Paint backgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG); private Paint whitePaint = new Paint(Paint.ANTI_ALIAS_FLAG); private Paint yellowPaint = new Paint(Paint.ANTI_ALIAS_FLAG); private int radius; private int CircleX,CircleY; private Canvas canvas; private boolean isYellow = false; private int delayTime = 500; private RotatePan rotatePan; private ImageView startBtn; private int screenWidth,screeHeight; private int MinValue; /** * LuckPan 中间对应的Button必须设置tag为 startbtn. */ private static final String START_BTN_TAG = "startbtn"; public static final int DEFAULT_TIME_PERIOD = 500; public LuckPanLayout(Context context) { this(context,null); } public LuckPanLayout(Context context, AttributeSet attrs) { this(context, attrs,0); } public LuckPanLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); this.context = context; Logger.setDebug(true); backgroundPaint.setColor(Color.rgb(255,92,93)); whitePaint.setColor(Color.WHITE); yellowPaint.setColor(Color.YELLOW); screeHeight = getResources().getDisplayMetrics().heightPixels; screenWidth = getResources().getDisplayMetrics().widthPixels; startLuckLight(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); MinValue = Math.min(screenWidth,screeHeight); MinValue -= Util.dip2px(context,10)*2; Logger.getLogger().d("screenWidth = " screenWidth "screenHeight = " screeHeight "MinValue = " MinValue); setMeasuredDimension(MinValue,MinValue); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); this.canvas = canvas; final int paddingLeft = getPaddingLeft(); final int paddingRight = getPaddingRight(); final int paddingTop = getPaddingTop(); final int paddingBottom = getPaddingBottom(); int width = getWidth() - paddingLeft - paddingRight; int height = getHeight() - paddingTop - paddingBottom; int MinValue = Math.min(width,height); radius = MinValue /2; CircleX = getWidth() /2; CircleY = getHeight() /2; canvas.drawCircle(CircleX,CircleY,radius,backgroundPaint); drawSmallCircle(isYellow); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); int centerX = (right - left)/2; int centerY = (bottom - top)/2; boolean panReady = false; for(int i=0;i<getChildCount();i ){ View child = getChildAt(i); if(child instanceof RotatePan){ rotatePan = (RotatePan) child; int panWidth = child.getWidth(); int panHeight = child.getHeight(); child.layout(centerX - panWidth/2 , centerY - panHeight/2,centerX panWidth/2 , centerY panHeight/2); panReady = true; }else if(child instanceof ImageView){ if(TextUtils.equals((String) child.getTag(),START_BTN_TAG)){ startBtn = (ImageView) child; int btnWidth = child.getWidth(); int btnHeight = child.getHeight(); child.layout(centerX - btnWidth/2 , centerY - btnHeight/2 , centerX btnWidth/2, centerY btnHeight/2 ); } } } if(!panReady) throw new RuntimeException("Have you add RotatePan in LuckPanLayout element ?"); } private void drawSmallCircle(boolean FirstYellow){ int pointDistance = radius - Util.dip2px(context,10); for(int i=0;i<=360;i =20){ int x = (int) (pointDistance * Math.sin(Util.change(i))) CircleX; int y = (int) (pointDistance * Math.cos(Util.change(i))) CircleY; if(FirstYellow) canvas.drawCircle(x,y,Util.dip2px(context,4),yellowPaint); else canvas.drawCircle(x,y,Util.dip2px(context,4),whitePaint); FirstYellow = !FirstYellow; } } /** * 开始旋转 * @param pos 转到指定的转盘，-1 则随机 * @param delayTime 外围灯光闪烁的间隔时间 */ public void rotate(int pos,int delayTime){ rotatePan.startRotate(pos); setDelayTime(delayTime); setStartBtnEnable(false); } protected void setStartBtnEnable(boolean enable){ if(startBtn != null) startBtn.setEnabled(enable); else throw new RuntimeException("Have you add start button in LuckPanLayout element ?"); } private void startLuckLight(){ postDelayed(new Runnable() { @Override public void run() { isYellow = !isYellow; invalidate(); postDelayed(this,delayTime); } },delayTime); } protected void setDelayTime(int delayTime){ this.delayTime = delayTime; } public interface AnimationEndListener{ void endAnimation(int position); } private AnimationEndListener l; public void setAnimationEndListener(AnimationEndListener l){ this.l = l; } public AnimationEndListener getAnimationEndListener(){ return l; }}