Android自定义View实现抽奖转盘

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

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。