android 图片设置圆角

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把图片变成圆角
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-----------------------帖子正文---------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/layout"
     android:orientation="vertical"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     >
</LinearLayout>
package com.test.demo;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
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.os.Bundle;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MyActivity extends Activity {
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

//        Drawable drawable = getResources().getDrawable(R.drawable.bg);
//        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
//        Bitmap bitmap = bitmapDrawable.getBitmap();
        
         LinearLayout layout = (LinearLayout) findViewById(R.id.layout);
         Drawable drawable = getResources().getDrawable(R.drawable.bg);
         BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
         Bitmap bitmap = bitmapDrawable.getBitmap();
        
         BitmapDrawable bbb = new BitmapDrawable(toRoundCorner(bitmap, 30));
         layout.setBackgroundDrawable(bbb);
         //ImageView imageView = (ImageView) findViewById(R.id.imgShow);
         //imageView.setImageBitmap(MyActivity.getRoundedCornerBitmap(bitmap));
         //imageView.setImageBitmap(MyActivity.toRoundCorner(bitmap, 20));
     }
     public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) { 
          
         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); 
         Canvas canvas = new Canvas(output); 
  
         final int color = 0xff424242; 
         final Paint paint = new Paint(); 
         final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); 
         final RectF rectF = new RectF(rect); 
         final float roundPx = pixels; 
  
         paint.setAntiAlias(true); 
         canvas.drawARGB(0, 0, 0, 0); 
         paint.setColor(color); 
         canvas.drawRoundRect(rectF, roundPx, roundPx, paint); 
  
         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
         canvas.drawBitmap(bitmap, rect, rect, paint); 
  
         return output; 
     }
}

原文链接：http://www.eoeandroid.com/thread-233561-1-1.html