Android 自定义的圆角矩形ImageView 工具类

上图看效果

自定义圆角矩形ImageView工具类

 package com.wechaotou.utils;

 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.PorterDuff.Mode;
 import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.widget.ImageView;

 /**
  * 自定义的圆角矩形ImageView，可以直接当组件在布局中使用。
  * @author caizhiming
  *
  */
 public class XCRoundRectImageView extends ImageView {

     private Paint paint;

     public XCRoundRectImageView(Context context) {
         this(context,null);
     }

     public XCRoundRectImageView(Context context, AttributeSet attrs) {
         this(context, attrs,0);
     }

     public XCRoundRectImageView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
         paint  = new Paint();
     }

     /**
      * 绘制圆角矩形图片
      * @author caizhiming
      */
     @Override
     protected void onDraw(Canvas canvas) {

         Drawable drawable = getDrawable();
         if (null != drawable) {
             Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
             Bitmap b = getRoundBitmap(bitmap, 20);
             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);

         } 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;

     }
 }

布局文件使用

        <com.wechaotou.utils.XCRoundRectImageView
            android:id="@+id/image_head"
            android:layout_width="77dp"
            android:layout_height="77dp"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="68dp"
            android:gravity="center_vertical"
            android:src="@drawable/text_order" />