学习地址

http://www.imooc.com/learn/444

LuckyPan.java:

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * Created by TONG on 2017/3/22.
 */

public class LuckyPan extends SurfaceView implements SurfaceHolder.Callback,Runnable {

    private SurfaceHolder mHolder;
    private Canvas mCanvas;
    /**
     * 用于绘制的线程
     */
    private Thread t;
    /**
     * 线程的控制开关
     */
    private boolean isRunning;

    /**
     * 盘块的奖项
     */
    private String[] mStrs=new String[]{"单反相机","IPAD","恭喜发财","IPHONE","服装一套","恭喜发财"};
    /**
     * 盘块的图片
     */
    private int[] mImgs=new int[]{R.mipmap.danfan, R.mipmap.ipad, R.mipmap.f040, R.mipmap.iphone, R.mipmap.meizi, R.mipmap.f040};
    /**
     * 与图片对应的bitmap数组
     */
    private Bitmap[] mImgBitmap;

    private Bitmap mBigBitmap= BitmapFactory.decodeResource(getResources(),R.mipmap.bg2);

    /**
     * 盘块的颜色
     */
        private int[] mColor=new int[]{0XFFFFC300, 0XFFF17E01, 0XFFFFC300, 0XFFF17E01, 0XFFFFC300, 0XFFF17E01
    };

    private int mItemCount=6;

    /**
     * 绘制盘块的画笔
     */
    private Paint mArcPaint;
    /**
     * 绘制文本的画笔
     */
    private Paint mTextPaint;

    /**
     * 盘块的背景图
     * RectF与Rect区别：1、精度不一样，Rect是使用int类型作为数值，RectF是使用float类型作为数值
     2、两个类型提供的方法也不是完全一致
     */
    private RectF mRange=new RectF();
    /**
     * 整个盘块的直径
     */
    private int mRadius;

    /**
     * 文字大小 20sp
     */
    private float mTextSize= TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,20,getResources().getDisplayMetrics());

    /**
     * 滚动的速度
     */
    private double mSpeed;
    /**
     *
     * 可能有两个线程操作
     * 保证线程间变量的可见性
     */
    private volatile int mStartAngle=0;
    /**
     * 是否点击了停止按钮
     */
    private boolean isShouldEnd;
    /**
     * 转盘的中心位置
     */
    private int mCenter;
    /**
     * 这里我们的padding直接以paddingLeft为准
     */
    private int mPadding;


    public LuckyPan(Context context) {
        this(context,null);
    }

    public LuckyPan(Context context, AttributeSet attrs) {
        super(context, attrs);
        mHolder=getHolder();
        mHolder.addCallback(this);
        //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();
        //直径
        mRadius=width-mPadding*2;
        //中心点
        mCenter=width/2;
        setMeasuredDimension(width,width);
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {

        //初始化绘制盘块的画笔
        mArcPaint=new Paint();
        //防止边缘的锯齿
        mArcPaint.setAntiAlias(true);
        //设置递色
        mArcPaint.setDither(true);

        //初始化绘制文本的画笔
        mTextPaint=new Paint();
        mTextPaint.setColor(0xffffffff);
        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;
        t=new Thread(this);
        t.start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        isRunning=false;
    }

    @Override
    public void run() {
        //不断进行绘制
        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){
                //draw something
                drawBg();

            }
        } catch (Exception e) {
        }finally {
            if(mCanvas!=null)
            {
                mHolder.unlockCanvasAndPost(mCanvas);
            }
        }
    }

    /**
     * 绘制背景
     */
    private void drawBg() {
        mCanvas.drawColor(0xFFFFFFFF);
        mCanvas.drawBitmap(mBigBitmap,null,
                new Rect(mPadding/2,mPadding/2,getMeasuredWidth()-mPadding/2,
                        getMeasuredHeight()-mPadding/2),null);
    }
}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffffff" >
    <myapplication3.xt.com.myapplication.LuckyPan
        android:layout_width="match_parent"
        android:padding="30dp"
        android:id="@+id/id_luckypan"
        android:layout_centerInParent="true"
        android:layout_height="match_parent" />

</RelativeLayout>

运行效果:

Paste_Image.png