android图片圆角效果

圆角效果：

 

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;

public class Main 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.jpg1);
        BitmapDrawable bitmapDrawable = (BitmapDrawable)drawable;
        Bitmap bitmap = bitmapDrawable.getBitmap();   
      
         ImageView imageView = (ImageView)findViewById(R.id.imgShow);
         imageView.setImageBitmap(Main.getRoundedCornerBitmap(bitmap));       
       
    }
 // 将图片的四角圆化
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
     
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), 
            bitmap.getHeight(), Config.ARGB_8888);
        //得到画布
        Canvas canvas = new Canvas(output);
    
       
       //将画布的四角圆化
        final int color = Color.RED; 
        final Paint paint = new Paint(); 
        //得到与图像相同大小的区域  由构造的四个值决定区域的位置以及大小
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); 
        final RectF rectF = new RectF(rect); 
        //值越大角度越明显
        final float roundPx = 50; 
      
        paint.setAntiAlias(true); 
        canvas.drawARGB(0, 0, 0, 0); 
        paint.setColor(color); 
        //drawRoundRect的第2,3个参数一样则画的是正圆的一角，如果数值不同则是椭圆的一角
        canvas.drawRoundRect(rectF, roundPx,roundPx, paint); 
      
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
        canvas.drawBitmap(bitmap, rect, rect, paint); 
      
        return output; 
      }
   
}

评论

2 楼 luozhiren 2013-01-18  

         

1 楼 qq50956466 2011-09-22  

很实用