抽奖轮盘
主页面
package com.example.zy_choujianglunpan; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.ImageView; import com.example.zy_choujianglunpan.R; public class MainActivity extends Activity { private KongJian mLuckyPanView; private ImageView mStartBtn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLuckyPanView = (KongJian) findViewById(R.id.id_luckypan); mStartBtn = (ImageView) findViewById(R.id.id_start_btn); //图片的点击事件 mStartBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //判断显示的图片是停止还是开始 if (!mLuckyPanView.isStart()) { //停止时显示的图片 mStartBtn.setImageResource(R.drawable.stop); mLuckyPanView.luckyStart(1); } else { if (!mLuckyPanView.isShouldEnd()) { //开始时显示的图片 mStartBtn.setImageResource(R.drawable.start); mLuckyPanView.luckyEnd(); } } } }); } }
控件类
package com.example.zy_choujianglunpan; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.Path; import android.graphics.Rect; import android.graphics.RectF; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import java.util.Random; public class KongJian extends SurfaceView implements Callback, Runnable { private SurfaceHolder mHolder; /** * 与SurfaceHolder绑定的Canvas */ private Canvas mCanvas; /** * 用于绘制的线程 */ private Thread t; /** * 线程的控制开关 */ private boolean isRunning; /** * 抽奖的文字 */ private String[] mStrs = new String[] { "妹子两只", "妹纸三只", "一群妹纸", "老婆们", "妹子一只", "比利王" }; /** * 每个盘块的颜色 */ private int[] mColors = new int[] { 0xFFFFC300, 0xFFF17E01, 0xFFFFC300, 0xFFF17E01, 0xFFFFC300, 0xFFF17E01 }; /** * 与文字对应的图片 */ private int[] mImgs = new int[] { R.drawable.mz2, R.drawable.mz3, R.drawable.mzyq, R.drawable.lpm, R.drawable.mz1, R.drawable.f040 }; /** * 与文字对应图片的bitmap数组 */ private Bitmap[] mImgsBitmap; /** * 盘块的个数 */ private int mItemCount = 6; /** * 绘制盘块的范围 */ private RectF mRange = new RectF(); /** * 圆的直径 */ private int mRadius; /** * 绘制盘快的画笔 */ private Paint mArcPaint; /** * 绘制文字的画笔 */ private Paint mTextPaint; /** * 滚动的速度 */ private double mSpeed; private volatile float mStartAngle = 0; /** * 是否点击了停止 */ private boolean isShouldEnd; /** * 控件的中心位置 */ private int mCenter; /** * 控件的padding，这里我们认为4个padding的值一致，以paddingleft为标准 */ private int mPadding; /** * 背景图的bitmap */ private Bitmap mBgBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.bg2); /** * 文字的大小 */ private float mTextSize = TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_SP, 20, getResources().getDisplayMetrics()); public KongJian(Context context) { this(context, null); } public KongJian(Context context, AttributeSet attrs) { super(context, attrs); mHolder = getHolder(); mHolder.addCallback(this); // setZOrderOnTop(true);// 设置画布 背景透明 // mHolder.setFormat(PixelFormat.TRANSLUCENT); setFocusable(true); setFocusableInTouchMode(true); this.setKeepScreenOn(true); } /** * 设置控件为正方形 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int width = Math.min(getMeasuredWidth(), getMeasuredHeight()); // 获取圆形的直径 mRadius = width - getPaddingLeft() - getPaddingRight(); // padding值 mPadding = getPaddingLeft(); // 中心点 mCenter = width / 2; setMeasuredDimension(width, width); } @Override public void surfaceCreated(SurfaceHolder holder) { // 初始化绘制圆弧的画笔 mArcPaint = new Paint(); mArcPaint.setAntiAlias(true); mArcPaint.setDither(true); // 初始化绘制文字的画笔 mTextPaint = new Paint(); mTextPaint.setColor(0xFFffffff); mTextPaint.setTextSize(mTextSize); // 圆弧的绘制范围 mRange = new RectF(getPaddingLeft(), getPaddingLeft(), mRadius + getPaddingLeft(), mRadius + getPaddingLeft()); // 初始化图片 mImgsBitmap = new Bitmap[mItemCount]; for (int i = 0; i < mItemCount; i++) { mImgsBitmap[i] = BitmapFactory.decodeResource(getResources(), mImgs[i]); } // 开启线程 isRunning = true; t = new Thread(this); t.start(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceDestroyed(SurfaceHolder holder) { // 通知关闭线程 isRunning = false; } @Override public void run() { // 不断的进行draw while (isRunning) { long start = System.currentTimeMillis(); draw(); long end = System.currentTimeMillis(); try { if (end - start < 50) { Thread.sleep(50 - (end - start)); } } catch (InterruptedException e) { e.printStackTrace(); } } } private void draw() { try { // 获得canvas mCanvas = mHolder.lockCanvas(); if (mCanvas != null) { // 绘制背景图 drawBg(); /** * 绘制每个块块，每个块块上的文本，每个块块上的图片 */ float tmpAngle = mStartAngle; float sweepAngle = (float) (360 / mItemCount); for (int i = 0; i < mItemCount; i++) { // 绘制快快 mArcPaint.setColor(mColors[i]); // mArcPaint.setStyle(Style.STROKE); mCanvas.drawArc(mRange, tmpAngle, sweepAngle, true, mArcPaint); // 绘制文本 drawText(tmpAngle, sweepAngle, mStrs[i]); // 绘制Icon drawIcon(tmpAngle, i); tmpAngle += sweepAngle; } // 如果mSpeed不等于0，则相当于在滚动 mStartAngle += mSpeed; // 点击停止时，设置mSpeed为递减，为0值转盘停止 if (isShouldEnd) { mSpeed -= 1; } if (mSpeed <= 0) { mSpeed = 0; isShouldEnd = false; } // 根据当前旋转的mStartAngle计算当前滚动到的区域 calInExactArea(mStartAngle); } } catch (Exception e) { e.printStackTrace(); } finally { if (mCanvas != null) mHolder.unlockCanvasAndPost(mCanvas); } } /** * 根据当前旋转的mStartAngle计算当前滚动到的区域 绘制背景，不重要，完全为了美观 */ private void drawBg() { mCanvas.drawColor(0xFFFFFFFF); mCanvas.drawBitmap(mBgBitmap, null, new Rect(mPadding / 2, mPadding / 2, getMeasuredWidth() - mPadding / 2, getMeasuredWidth() - mPadding / 2), null); } /** * 根据当前旋转的mStartAngle计算当前滚动到的区域 * * @param startAngle */ public void calInExactArea(float startAngle) { // 让指针从水平向右开始计算 float rotate = startAngle + 90; rotate %= 360.0; for (int i = 0; i < mItemCount; i++) { // 每个的中奖范围 float from = 360 - (i + 1) * (360 / mItemCount); float to = from + 360 - (i) * (360 / mItemCount); if ((rotate > from) && (rotate < to)) { Log.d("TAG", mStrs[i]); return; } } } private void drawIcon(float startAngle, int i) { // 设置图片的宽度为直径的1/8 int imgWidth = mRadius / 8; float angle = (float) ((30 + startAngle) * (Math.PI / 180)); int x = (int) (mCenter + mRadius / 2 / 2 * Math.cos(angle)); int y = (int) (mCenter + mRadius / 2 / 2 * Math.sin(angle)); // 确定绘制图片的位置 Rect rect = new Rect(x - imgWidth / 2, y - imgWidth / 2, x + imgWidth / 2, y + imgWidth / 2); mCanvas.drawBitmap(mImgsBitmap[i], null, rect, null); } private void drawText(float startAngle, float sweepAngle, String string) { Path path = new Path(); path.addArc(mRange, startAngle, sweepAngle); float textWidth = mTextPaint.measureText(string); // 利用水平偏移让文字居中 float hOffset = (float) (mRadius * Math.PI / mItemCount / 2 - textWidth / 2);// 水平偏移 float vOffset = mRadius / 2 / 6;// 垂直偏移 mCanvas.drawTextOnPath(string, path, hOffset, vOffset, mTextPaint); } /** * 点击开始旋转 * * @param luckyIndex */ public void luckyStart(int luckyIndex) { // 每项角度大小 float angle = (float) (360 / mItemCount); // 中奖角度范围（因为指针向上，所以水平第一项旋转到指针指向，需要旋转210-270；） //获取随机数，使用随机数来进行旋转的角度 Random r = new Random(); //一圈是360度 int i = r.nextInt(360); // 停下来时旋转的距离 float targetFrom = 4 * 360 + i; /** * <pre> * (v1 + 0) * (v1+1) / 2 = target ; * v1*v1 + v1 - 2target = 0 ; * v1=-1+(1*1 + 8 *1 * target)/2; * </pre> */ float v1 = (float) (Math.sqrt(1 * 1 + 8 * 1 * targetFrom) - 1) / 2; float targetTo = 4 * 360 + i; float v2 = (float) (Math.sqrt(1 * 1 + 8 * 1 * targetTo) - 1) / 2; mSpeed = (float) (v1 + Math.random() * (v2 - v1)); isShouldEnd = false; } public void luckyEnd() { mStartAngle = 0; isShouldEnd = true; } public boolean isStart() { return mSpeed != 0; } public boolean isShouldEnd() { return isShouldEnd; } }
主页面布局
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.zy_choujianglunpan.MainActivity"> <com.example.zy_choujianglunpan.KongJian android:id="@+id/id_luckypan" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_centerInParent="true" android:padding="30dp" /> <ImageView android:id="@+id/id_start_btn" android:src="@drawable/start" android:layout_centerInParent="true" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout>