Android studio实现刮刮乐的方法

本文实例为大家分享了android studio实现刮刮乐的具体代码，供大家参考，具体内容如下

mainactivity

public class mainactivity extends appcompatactivity {

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
  }
}

第一种方法：

guatwo

public class guatwo extends view {
  /*第一种方法*/
  private path mpath;//手刮动的path，过程
  private paint moutterpaint;//绘制mpath的画笔
  private canvas mcanvas;//临时画布
  private bitmap mbitmap;//临时图片

  //记录用户path每次的开始坐标值
  private int mlastx;
  private int mlasty;

  private bitmap moutterbitmap;//图片遮罩，就是手刮动，要擦掉的那张图

  public guatwo(context context) {
    this(context, null);
  }

  public guatwo(context context, attributeset attrs) {
    this(context, attrs, 0);
  }

  public guatwo(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    init();
  }


  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    //获得控件的宽高
    int width = getmeasuredwidth();
    int height = getmeasuredheight();
    //初始化bitmap
    mbitmap = bitmap.createbitmap(width, height, bitmap.config.argb_8888);
    mcanvas = new canvas(mbitmap);

    //设置画笔属性
    setupoutpaint();
    mcanvas.drawcolor(color.parsecolor("#c0c0c0"));
  }

  @override
  protected void ondraw(canvas canvas) {
    moutterpaint.setstyle(paint.style.stroke);
    moutterpaint.setxfermode(new porterduffxfermode(porterduff.mode.dst_out));//mode.dst_out改模式就类似橡皮檫，这个属性设置是关键
    canvas.drawbitmap(moutterbitmap, 0, 0, null);
    canvas.drawbitmap(mbitmap, 0, 0, null);
    mcanvas.drawpath(mpath, moutterpaint);
  }

  @override
  public boolean ontouchevent(motionevent event) {
    int action = event.getaction();
    int x = (int) event.getx();
    int y = (int) event.gety();

    switch (action) {
      case motionevent.action_down://按下
        //记录按下的时候的x和y值，以便于之后移动的时候绘制
        mlastx = x;
        mlasty = y;
        mpath.moveto(mlastx, mlasty);
        break;
      case motionevent.action_move://移动
        //拿到用户移动的x绝对值，y轴绝对值
        int dx = math.abs(x - mlastx);
        int dy = math.abs(y - mlasty);
        //用户滑动超过3像素才会改变，这个可以不做，做只是为了避免很频繁的响应而已。
        if (dx > 3 || dy > 3) {
          mpath.lineto(x, y);
        }
        mlastx = x;
        mlasty = y;
        break;
    }
    invalidate();//刷新ui
    return true;
  }

  /**
   * 绘制path（也就是手刮动的path来绘制） 的画笔属性
   * 类似橡皮擦
   */
  private void setupoutpaint() {
    moutterpaint.setcolor(color.red);
    moutterpaint.setantialias(true);
    moutterpaint.setdither(true);
    moutterpaint.setstrokejoin(paint.join.round);//设置圆角
    moutterpaint.setstrokecap(paint.cap.round);
    moutterpaint.setstyle(paint.style.fill);
    moutterpaint.setstrokewidth(60);//设置画笔宽度
  }
  /**
   * 初始化信息
   */
  private void init() {
    moutterpaint = new paint();
    mpath = new path();
    moutterbitmap = bitmapfactory.decoderesource(getresources(),
        r.drawable.mein);
  }

第二种方法：

guatwo

private path mpath;//手刮动的path，过程
  private paint moutterpaint;//绘制mpath的画笔
  private canvas mcanvas;
  private bitmap mbitmap;

  //记录用户path每次的开始坐标值
  private int mlastx;
  private int mlasty;

  private bitmap moutterbitmap;//图片遮罩，就是手刮动，要擦掉的那张图
  private string mtext;//刮奖文本信息
  private rect mtextbound;
  private paint mbackpaint;//刮奖信息的画笔

  public guatwo(context context) {
    this(context, null);
  }

  public guatwo(context context, attributeset attrs) {
    this(context, attrs, 0);
  }

  public guatwo(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    init();
  }


  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    //获得控件的宽高
    int width = getmeasuredwidth();
    int height = getmeasuredheight();
    //初始化bitmap
    mbitmap = bitmap.createbitmap(width, height, bitmap.config.argb_8888);
    mcanvas = new canvas(mbitmap);//用指定的位图构造一个画布来绘制。

    //设置画笔属性
    setupoutpaint();
    setupbackpaint();

//    mcanvas.drawcolor(color.parsecolor("#c0c0c0"));
    mcanvas.drawroundrect(new rectf(0, 0, width, height), 30, 30,
        moutterpaint);//用moutterpaint画圆角矩形
    mcanvas.drawbitmap(moutterbitmap, null, new rect(0, 0, width, height),
        null);//在刚刚画的圆角矩形上面再画一个bitmap图片，让图片大小和圆角矩形大小相关联
  }

  @override
  protected void ondraw(canvas canvas) {
    moutterpaint.setstyle(paint.style.stroke);
    moutterpaint.setxfermode(new porterduffxfermode(porterduff.mode.dst_out));//mode.dst_out改模式就类似橡皮檫，这个属性设置是关键
    canvas.drawtext(mtext, (getwidth() - mtextbound.width()) / 2, getheight() / 2 - mtextbound.height() / 2, mbackpaint);//把获奖信息放在正中间
    mcanvas.drawpath(mpath, moutterpaint);
    canvas.drawbitmap(mbitmap, 0, 0, null);
  }

  @override
  public boolean ontouchevent(motionevent event) {
    int action = event.getaction();
    int x = (int) event.getx();
    int y = (int) event.gety();

    switch (action) {
      case motionevent.action_down://按下
        //记录按下的时候的x和y值，以便于之后移动的时候绘制
        mlastx = x;
        mlasty = y;
        mpath.moveto(mlastx, mlasty);
        break;
      case motionevent.action_move://移动
        //拿到用户移动的x绝对值，y轴绝对值
        int dx = math.abs(x - mlastx);
        int dy = math.abs(y - mlasty);
        //用户滑动超过3像素才会改变，这个可以不做，做只是为了避免很频繁的相应而已。
        if (dx > 3 || dy > 3) {
          mpath.lineto(x, y);
        }
        mlastx = x;
        mlasty = y;
        break;
    }
    invalidate();//刷新ui
    return true;
  }
  private void setupbackpaint() {
    mbackpaint.setcolor(color.red);
    mbackpaint.setstyle(paint.style.fill);
    mbackpaint.settextsize(60);
    //获得当前画笔绘制文本的宽和高
    mbackpaint.gettextbounds(mtext, 0, mtext.length(), mtextbound);
  }
  *//**
   * 绘制path（也就是手刮动的path来绘制） 的画笔属性
   * 类似橡皮擦
   *//*
  private void setupoutpaint() {
    moutterpaint.setcolor(color.red);
    moutterpaint.setantialias(true);
    moutterpaint.setdither(true);
    moutterpaint.setstrokejoin(paint.join.round);//设置圆角
    moutterpaint.setstrokecap(paint.cap.round);
    moutterpaint.setstyle(paint.style.fill);
    moutterpaint.setstrokewidth(60);//设置画笔宽度
  }
  *//**
   * 初始化信息
   *//*
  private void init() {
    moutterpaint = new paint();
    mpath = new path();
    moutterbitmap = bitmapfactory.decoderesource(getresources(),
        r.drawable.huahua);
    mtext = "您中奖了！";
    mtextbound = new rect();
    mbackpaint = new paint();
  }

布局文件

xml文件：

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingbottom="@dimen/activity_vertical_margin"
  android:paddingleft="@dimen/activity_horizontal_margin"
  android:paddingright="@dimen/activity_horizontal_margin"
  android:paddingtop="@dimen/activity_vertical_margin"
  tools:context="com.bwie.test.guaguale.mainactivity">

  <com.bwie.test.guaguale.guatwo
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</relativelayout>

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。