Android自定义带圆角的ImageView

最近有一个实现一个带有圆角的imageview的需求，在网上找了找三方，虽然demo都是正确的，但是移植过来就不可以了，因为请求链接的时候用的是xutils中bitmap来进行解析的，这样就总是会报类型转换异常的错误。

就这样只能自己定义一个了.

demo:

package com.yizooo.yizooo.ui;
 
 
import android.content.context;
import android.graphics.bitmap;
import android.graphics.bitmap.config;
import android.graphics.canvas;
import android.graphics.paint;
import android.graphics.pixelformat;
import android.graphics.rectf;
import android.graphics.porterduff.mode;
import android.graphics.porterduffxfermode;
import android.graphics.rect;
import android.graphics.drawable.bitmapdrawable;
import android.graphics.drawable.drawable;
import android.util.attributeset;
import android.widget.imageview;
 
import com.lidroid.xutils.bitmap.core.asyncdrawable;
 
 
/**
 * created by 雪宝宝 on 2016/3/27.
 * 自定义圆角工具
 */
public class roundimageview extends imageview {
  private paint paint;
 
  public roundimageview(context context) {
    this(context,null);
  }
 
  public roundimageview(context context, attributeset attrs) {
    this(context, attrs,0);
  }
 
  public roundimageview(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    paint = new paint();
  }
 
  /**
   * 绘制圆角矩形图片
   */
  @override
  protected void ondraw(canvas canvas) {
    drawable drawable = getdrawable();
    bitmap bitmap = null;
    if (null != drawable && drawable instanceof bitmapdrawable ) {
      bitmapdrawable bitmapdrawable = (bitmapdrawable) drawable;
       bitmap = bitmapdrawable.getbitmap();
      //bitmap bitmap =( (bitmapdrawable)drawable).getbitmap();
      bitmap b = getroundbitmap(bitmap, 10);
      final rect rectsrc = new rect(0, 0, b.getwidth(), b.getheight());
      final rect rectdest = new rect(0,0,getwidth(),getheight());
      paint.reset();
      canvas.drawbitmap(b, rectsrc, rectdest, paint);
 
    }//防止出现类型转换异常
    else if(this.getdrawable() instanceof asyncdrawable){
      bitmap = bitmap
          .createbitmap(
              getwidth(),
              getheight(),
              drawable.getopacity() != pixelformat.opaque ? bitmap.config.argb_8888
                  : bitmap.config.rgb_565);
      canvas canvas1 = new canvas(bitmap);
      // canvas.setbitmap(bitmap);
      drawable.setbounds(0, 0, getwidth(),
          getheight());
      drawable.draw(canvas1);
    }
    else {
      super.ondraw(canvas);
    }
  }
 
  /**
   * 获取圆角矩形图片方法
   * @param bitmap
   * @param roundpx,一般设置成14
   * @return bitmap
   * @author caizhiming
   */
  private bitmap getroundbitmap(bitmap bitmap, int roundpx) {
    bitmap output = bitmap.createbitmap(bitmap.getwidth(),
        bitmap.getheight(), config.argb_8888);
    canvas canvas = new canvas(output);
 
    final int color = 0xff424242;
 
    final rect rect = new rect(0, 0, bitmap.getwidth(), bitmap.getheight());
    final rectf rectf = new rectf(rect);
    paint.setantialias(true);
    canvas.drawargb(0, 0, 0, 0);
    paint.setcolor(color);
    int x = bitmap.getwidth();
 
    canvas.drawroundrect(rectf, roundpx, roundpx, paint);
    paint.setxfermode(new porterduffxfermode(mode.src_in));
    canvas.drawbitmap(bitmap, rect, rect, paint);
    return output;
 
 
  }
}

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/swipelayout"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" >
 
    <com.yizooo.yizooo.ui.roundimageview
      android:id="@+id/item_frag_news_icon"
      android:layout_width="@dimen/dp_47"
      android:layout_height="@dimen/dp_50"
      android:scaletype="fitxy"
      android:src="@mipmap/fuwutongzhi"
      android:layout_margin="@dimen/dp_10"
      />
</relativelayout>

最终的效果图就不发照片了,各位朋友尝试一下就可以看出效果图了。

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。