Android开发使用Drawable绘制圆角与圆形图案功能示例

本文实例讲述了android开发使用drawable绘制圆角与圆形图案功能。分享给大家供大家参考，具体如下：

1. 创建类roundcircledrawable继承drawable

/**
 * 圆角矩形
 * @project  app_view
 * @package  com.android.view.drawable
 * @author   chenlin
 * @version  1.0
 * @date    2016年4月21日
 * @note    todo
 */
public class roundcircledrawable extends drawable{
  private paint mpaint;//画笔
  private int mwidth;//图片宽与长度的最小值
  private int mradius;//半径
  private int mround;//圆角
  private rectf mrectf;//矩形
  private bitmap mbitmap;//图片
  private type mtype = type.type_round;//默认是矩形
  //设置类型
  enum type{
    type_round, type_cicle;
  }
  public roundcircledrawable(bitmap bitmap){
    this.mbitmap = bitmap;
    //初始化画笔
    mpaint = new paint();
    mpaint.setantialias(true);
    bitmapshader shader = new bitmapshader(mbitmap, tilemode.clamp, tilemode.clamp);
    mpaint.setshader(shader);
    mwidth = math.min(mbitmap.getwidth(), mbitmap.getheight());
    mradius = mwidth / 2;
  }
  /**
   * 向外提供设置图片类型的方法
   * @param type
   */
  public void settype(type type){
    this.mtype = type;
  }
  /**
   * 暴露给外面设置圆角的大小
   * 
   * @param round
   */
  public void setround(int round) {
    this.mround = round;
  }
  @override
  public void setbounds(int left, int top, int right, int bottom) {
    super.setbounds(left, top, right, bottom);
    mrectf = new rectf(left, top, right, bottom);
  }
  @override
  public void draw(canvas canvas) {
    if (mtype == type.type_round) {
      canvas.drawroundrect(mrectf, mround, mround, mpaint);
    }else {
      canvas.drawcircle(mwidth / 2, mwidth / 2, mradius, mpaint);
    }
  }
  @override
  public int getintrinsicwidth() {
    if (mtype == type.type_cicle) {
      return mwidth;
    }else {
      return mbitmap.getwidth();
    }
  }
  @override
  public int getintrinsicheight() {
    if (mtype == type.type_cicle) {
      return mwidth;
    }else {
      return mbitmap.getheight();
    }
  }
  @override
  public void setalpha(int alpha) {
    mpaint.setalpha(alpha);
  }
  @override
  public void setcolorfilter(colorfilter cf) {
    mpaint.setcolorfilter(cf);
  }
  @override
  public int getopacity() {
    return pixelformat.translucent;
  }
}

2. 实现方法

public class roundactivity extends activity {
  private imageview mimageview;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_round_drawable);
    mimageview = (imageview) findviewbyid(r.id.iv_round);
    bitmap bitmap = bitmapfactory.decoderesource(getresources(), r.drawable.aa);
    //roundimagedrawable drawable = new roundimagedrawable(bitmap);
    //drawable.setround(30);
    roundcircledrawable drawable = new roundcircledrawable(bitmap);
    drawable.setround(50);
    mimageview.setimagedrawable(drawable);
  }
}

更多关于android相关内容感兴趣的读者可查看本站专题：《android图形与图像处理技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。