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Android 自定义星评空间示例代码

程序员文章站 2023-11-12 13:20:04
没事做用自定义view方式写一个星评控件，虽说网上很多这个控件，但是这是自己写的，在这里记录一下。 首先需要自定义属性

没事做用自定义view方式写一个星评控件，虽说网上很多这个控件，但是这是自己写的，在这里记录一下。

首先需要自定义属性

<declare-styleable name="rate">
    <!--属性分别是：单个的宽，高，之间的距离，激活的数量，总数量，激活的drawable，没有激活的drawable，是否可以选择数量-->
    <attr name="custom_rate_width" format="dimension"/>
    <attr name="custom_rate_height" format="dimension"/>
    <attr name="custom_rate_padding" format="dimension"/>
    <attr name="custom_rate_active_size" format="integer"/>
    <attr name="custom_rate_size" format="integer"/>
    <attr name="custom_rate_active_drawable" format="reference"/>
    <attr name="custom_rate_disactive_drawable" format="reference"/>
    <attr name="custom_rate_touch" format="boolean"/>
  </declare-styleable>

初始化代码

 protected void init(context context, attributeset attrs) {
    typedarray array = context.obtainstyledattributes(attrs, r.styleable.rate);
    int activeid = 0;
    int disactiveid = 0;
    if (array != null) {
      size = array.getint(r.styleable.rate_custom_rate_size, 5);
      activesize = array.getint(r.styleable.rate_custom_rate_active_size, 3);
      ratewidth = array.getdimensionpixeloffset(r.styleable.rate_custom_rate_width, 0);
      rateheight = array.getdimensionpixeloffset(r.styleable.rate_custom_rate_height, 0);
      activeid = array.getresourceid(r.styleable.rate_custom_rate_active_drawable, 0);
      disactiveid = array.getresourceid(r.styleable.rate_custom_rate_disactive_drawable, 0);
      padding = array.getdimensionpixeloffset(r.styleable.rate_custom_rate_padding, 0);
      istouch = array.getboolean(r.styleable.rate_custom_rate_touch, false);
      array.recycle();
    }
    //如果没有宽高就设置一个默认值
    if (rateheight <= 0){
      rateheight = 80;
    }
    if (ratewidth <= 0){
      ratewidth = 80;
    }
    if (activeid!=0){
      activebitmap = bitmapfactory.decoderesource(getresources(), activeid);
      //如果没有设置宽高时候
      if (ratewidth <= 0) {
        ratewidth = activebitmap.getwidth();
      }
      //把图片压缩到设置的宽高
      activebitmap = bitmap.createscaledbitmap(activebitmap, (int) ratewidth, (int) rateheight, false);
    }
    if (disactiveid != 0){
      disactivebitmap = bitmapfactory.decoderesource(getresources(), disactiveid);
      if (rateheight <= 0) {
        rateheight = activebitmap.getheight();
      }
      disactivebitmap = bitmap.createscaledbitmap(disactivebitmap, (int) ratewidth, (int) rateheight, false);
    }
    mpaint = new paint();//初始化bitmap的画笔
    mpaint.setantialias(true);
    activpaint = new paint();//初始化选中星星的画笔
    activpaint.setantialias(true);
    activpaint.setcolor(color.yellow);
    disactivpaint = new paint();//初始化未选中星星的画笔
    disactivpaint.setantialias(true);
    disactivpaint.setcolor(color.gray);
  }

onmeasure方法设置view的宽高，如果设置的每一个星星控件的宽高大于实际view的宽高，就用星星空间的宽高作于view的宽高

@override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    int widthmode = measurespec.getmode(widthmeasurespec);
    int widthsize = measurespec.getsize(widthmeasurespec);
    int heightmode = measurespec.getmode(heightmeasurespec);
    int heightsize = measurespec.getsize(heightmeasurespec);
    //计算宽
    if (widthmode == measurespec.exactly) {
      //如果view的宽度小于设置size*星星的宽度，就用size * (int) (padding + ratewidth)做为控件的宽度度
      if (widthsize < size * (int) (padding + ratewidth)) {
        width = size * (int) (padding + ratewidth);
      } else {
        width = widthsize;
      }
    } else {
      width = size * (int) (padding + ratewidth)-padding;
    }
    //计算高
    if (heightmode == measurespec.exactly) {
      //如果view的高度小于设置星星的高度，就用星星高度做为控件的高度
      if (heightsize < rateheight) {
        height = (int) rateheight + 5;
      } else {
        height = heightsize;
      }
    } else {
      height = (int) rateheight + 5;
    }
    setmeasureddimension(width, height);
  }

ondraw方法中绘制

//开始画active
    for (int i = 0; i < activesize; i++) {
      if (activebitmap != null){
        if (i == 0) {
          canvas.drawbitmap(activebitmap, ratewidth * i, (height - rateheight) / 2, mpaint);
        } else {
          canvas.drawbitmap(activebitmap, (ratewidth + padding) * i, (height - rateheight) / 2, mpaint);
        }
      }else {
        drawactivrate(i,canvas);
      }
    }
//    //开始画disactive
    for (int i = activesize; i < size; i++) {
      if (disactivebitmap != null){
        if (i == 0) {
          canvas.drawbitmap(disactivebitmap, ratewidth * i, (height - rateheight) / 2, mpaint);
        } else {
          canvas.drawbitmap(disactivebitmap, (ratewidth + padding) * i, (height - rateheight) / 2, mpaint);
        }
      }else {
        drawdisactivrate(i,canvas);
      }
    }

上面用到两个方法drawactivrate和drawdisactivrate，分别是在没有设置活动中的星星和不在活动中星星的图片的时候，绘制在活动和不在活动的默认星星：

/**
   * 绘制黄色的五角星（在活动的）
   * */
  private void drawactivrate(int position,canvas canvas){
    float radius = ratewidth/2;//根據每一個星星的位置繪製園，確定五角星五個點的位置
    float angle = 360/5;
    float centerx = (ratewidth+padding)*(position+1)-padding-radius;//獲取每一個星星空間的中心位置的x坐標
    float centery =height/2;//獲取每一個星星空間的中心位置的y坐標
    path mpath = new path();
    mpath.moveto(centerx,centery-radius);
    mpath.lineto(centerx+(float) math.cos((angle*2-90)*math.pi / 180)*radius,centery+(float)math.sin((angle*2-90)*math.pi / 180)*radius);
    mpath.lineto( centerx-(float)math.sin(angle*math.pi / 180)*radius,centery-(float)math.cos(angle*math.pi / 180)*radius);
    mpath.lineto( centerx+(float)math.sin(angle*math.pi / 180)*radius,centery-(float)math.cos(angle*math.pi / 180)*radius);
    mpath.lineto( centerx-(float)math.sin((angle*3-180)*math.pi / 180)*radius,centery+(float)math.cos((angle*3-180)*math.pi / 180)*radius);
//    mpath.lineto(centerx,centery-radius);
    mpath.close();
    canvas.drawpath(mpath,activpaint);
  }
  /**
   * 绘制灰色的五角星
   * */
  private void drawdisactivrate(int position,canvas canvas){
    float radius = ratewidth/2;
    float angle = 360/5;
    float centerx = (ratewidth+padding)*(position+1)-padding-radius;
    float centery =height/2;
    path mpath = new path();
    mpath.moveto(centerx,centery-radius);
    mpath.lineto(centerx+(float) math.cos((angle*2-90)*math.pi / 180)*radius,centery+(float)math.sin((angle*2-90)*math.pi / 180)*radius);
    mpath.lineto( centerx-(float)math.sin(angle*math.pi / 180)*radius,centery-(float)math.cos(angle*math.pi / 180)*radius);
    mpath.lineto( centerx+(float)math.sin(angle*math.pi / 180)*radius,centery-(float)math.cos(angle*math.pi / 180)*radius);
    mpath.lineto( centerx-(float)math.sin((angle*3-180)*math.pi / 180)*radius,centery+(float)math.cos((angle*3-180)*math.pi / 180)*radius);
//    mpath.lineto(centerx,centery-radius);
    mpath.close();
    canvas.drawpath(mpath,disactivpaint);
  }

最后在ontouchevent方法中处理选中和未选中星星的处理

@override
  public boolean ontouchevent(motionevent event) {
    if (!istouch){//如果不支持觸摸
      return false;
    }
    switch (event.getaction()) {
      case motionevent.action_down:
        touchx = event.getx();
        touchy = event.gety();
        for (int i = 0; i < size; i++) {
          if (i == 0) {
            if (0.0 < touchx && touchx < ratewidth+padding/2) {
              activesize = 1;
            }
          }else {
            if ((ratewidth+padding)*i-padding/2<touchx&&touchx<(ratewidth+padding)*(i+1)-padding/2){
              activesize = i+1;
            }
          }
        }
        invalidate();
        break;
      case motionevent.action_up:
        if ( null!= changelistener){
          changelistener.change(activesize);
        }
        break;
      case motionevent.action_move:
        touchx = event.getx();
        touchy = event.gety();
        for (int i = 0; i < size; i++) {
          if (i == 0) {
            if (0.0 < touchx && touchx < ratewidth+padding/2) {
              activesize = 1;
            }
          }else {
            if ((ratewidth+padding)*i-padding/2<touchx&&touchx<(ratewidth+padding)*(i+1)-padding/2){
              activesize = i+1;
            }
          }
        }
        invalidate();
        if (touchx<=0){
          activesize = 0;
        }
        break;
    }
    return true;
  }

以上就是自定义view写的星评控件，代码中的注解已经比较详细了，就不多说了，

源码地址

以上所述是小编给大家介绍的android自定义星评空间的实例代码，希望对大家有所帮助！

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