Android刮刮卡功能具体实现代码

今天整理之前的代码，忽然看到之前自己写的一个刮刮卡，整理下以便以后使用，同时分享给需要的朋友，如有错误，还请多多指正。

实现的步骤，其实就是徒手画三个图层叠加在一起，最上层是绘制需要的问题，就是以上所述的“骚年，刮我吧”，第二层就是覆盖宽高的灰层，第三层是结果层，多的不啰嗦了，具体实现如下，附上详细注释。

/**
 * 
 * created by zero on 2016-9-9
 * 
 * 刮刮卡
 * 
 */
public class scratchview extends view
{

  public scratchview(context context)
  {
    super(context);
    init();
  }

  private canvas mcanvas = null;
  private path mpath = null;
  private paint mpaint = null;

  // 定义画布的宽和高
  private int screenwidth = 720;
  private int screenheight = 360;
  private bitmap bitmap = null;

  private void init() {
    // todo auto-generated method stub
    mpath = new path();
    bitmap = bitmap.createbitmap(screenwidth, screenheight,
        config.argb_8888);

    // 对mpaint的设置
    mpaint = new paint();
    mpaint.setflags(paint.anti_alias_flag);
    mpaint.setantialias(true);
    mcanvas = new canvas();
    mpaint.setdither(true);
    // 设置画笔为空心
    mpaint.setstyle(style.stroke);
    // 设置线宽，即每次擦除的宽度
    mpaint.setstrokewidth(10);
    mpaint.setstrokecap(cap.round);
    mpaint.setstrokejoin(join.round);
    // 设置图形重叠时的处理方式，一共有16种方式，有兴趣可自己查阅
    mpaint.setxfermode(new porterduffxfermode(mode.dst_in));
    mpaint.setalpha(0);

    mcanvas = new canvas(bitmap);
    mcanvas.drawcolor(color.parsecolor("#c0c0c0"));
    setbitmaptext();
  }

  private void setbitmaptext() {
    paint paint = new paint();
    paint.settextsize(40);
    paint.setcolor(color.parsecolor("#9f9fa0"));
    paint.setflags(paint.anti_alias_flag);
    paint.setantialias(true);
    paint.settextalign(paint.align.center);
    paint.setfakeboldtext(true);

    canvas canvas = new canvas(bitmap);
    canvas.drawcolor(color.alpha(0));
    canvas.rotate(-20);
    // 遍历绘制文字
    for (int i = 0; i < screenwidth + 200; i += 300)
    {
      for (int j = 0; j < screenheight + 200; j += 60)
      {
        canvas.drawtext("刮我吧，骚年！", i, j, paint);
      }
    }
    setscratchbackground("一等奖");
  }

  // 接收后台传来的文字，即中奖或者未中奖的文字
  public void setscratchbackground(string txt_win) {
    // todo auto-generated method stub
    paint paint = new paint();
    bitmap bitmap = bitmap.createbitmap(screenwidth, screenheight,
        config.argb_8888);
    paint.settextsize(40);
    paint.setcolor(color.black);
    paint.setflags(paint.anti_alias_flag);
    paint.setantialias(true);
    paint.settextalign(paint.align.center);

    canvas canvas = new canvas(bitmap);
    canvas.drawcolor(color.alpha(0));
    canvas.drawtext(txt_win, screenwidth / 2, 60, paint);
    setbackgrounddrawable(new bitmapdrawable(getresources(), bitmap));
  }

  @override
  protected void ondraw(canvas canvas) {
    // todo auto-generated method stub
    super.ondraw(canvas);
    mcanvas.drawpath(mpath, mpaint);
    canvas.drawbitmap(bitmap, 0, 0, null);
  }

  int x = 0;
  int y = 0;

  @suppresslint("clickableviewaccessibility")
  @override
  public boolean ontouchevent(motionevent event) {
    // todo auto-generated method stub
    int action = event.getaction();
    int currx = (int) event.getx();
    int curry = (int) event.gety();
    switch (action)
    {
    case motionevent.action_down:
    {
      mpath.reset();
      x = currx;
      y = curry;
      mpath.moveto(x, y);
    }
      break;
    case motionevent.action_move:
    {
      mpath.quadto(x, y, currx, curry);
      x = currx;
      y = curry;
      postinvalidate();
    }
      break;
    case motionevent.action_up:
    {
      new thread(mrunnable).start();
    }
    case motionevent.action_cancel:
    {
      mpath.reset();
    }
      break;
    }
    return true;
  }

  private runnable mrunnable = new runnable()
  {
    private int[] mpixels;

    @override
    public void run() {
      float wipearea = 0;
      float totalarea = screenwidth * screenheight;
      bitmap mbitmap = bitmap;
      mpixels = new int[screenwidth * screenheight];
      /**
       * 拿到所有的像素信息
       */
      mbitmap.getpixels(mpixels, 0, screenwidth, 0, 0, screenwidth,
          screenheight);
      /**
       * 遍历统计擦除的区域
       */
      for (int i = 0; i < screenwidth; i++)
      {
        for (int j = 0; j < screenheight; j++)
        {
          int index = i + j * screenwidth;
          if (mpixels[index] == 0)
          {
            wipearea++;
          }
        }
      }

      /**
       * 根据所占百分比，进行一些操作
       */
      if (wipearea > 0 && totalarea > 0)
      {
        int percent = (int) (wipearea * 100 / totalarea);
        /**
         * 设置达到多少百分比的时候，弹窗提醒是否中奖此处设置为20
         */
        if (percent > 20)
        {
          /**
           * 刮开奖以后的操作，此处在子线程toast，可能会发生线程阻塞，只为测试使用
           */
          looper.prepare();
          toast.maketext(getcontext(), "已刮开" + percent + "%",
              toast.length_long).show();
          looper.loop();
        }
      }
    }
  };
}

发的是公司需要的效果，以上代码只是一个实现，各种样式还需要自己去实现。

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。