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。