本文实例为大家分享了Android自定义View实现抽奖转盘的具体代码，供大家参考，具体内容如下
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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); }} |
效果图：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/flying_fish_wj/article/details/54845676
