圆形imageview自定义

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import android.content.Context; 

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.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.util.AttributeSet; 
import android.widget.ImageView; 
 
public class RoundImageView extends ImageView { 
 
public RoundImageView(Context context) { 
    super(context); 
    // TODO Auto-generated constructor stub 
} 
 
public RoundImageView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
} 
 
public RoundImageView(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
} 
 
@Override 
protected void onDraw(Canvas canvas) { 
 
    Drawable drawable = getDrawable(); 
 
    if (drawable == null) { 
        return; 
    } 
 
    if (getWidth() == 0 || getHeight() == 0) { 
        return;  
    } 
     
    Bitmap b =  ((BitmapDrawable)drawable).getBitmap(); 
     
    if(null == b) 
    { 
        return; 
    } 
     
    Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true); 
 
    int w = getWidth(), h = getHeight(); 
 
 
    Bitmap roundBitmap =  getCroppedBitmap(bitmap, w); 
    canvas.drawBitmap(roundBitmap, 0,0, null); 
 
} 
 
public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) { 
    Bitmap sbmp; 
    if(bmp.getWidth() != radius || bmp.getHeight() != radius) 
        sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false); 
    else 
        sbmp = bmp; 
    Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), 
            sbmp.getHeight(), Config.ARGB_8888); 
    Canvas canvas = new Canvas(output); 
 
    final int color = 0xffa19774; 
    final Paint paint = new Paint(); 
    final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight()); 
 
    paint.setAntiAlias(true); 
    paint.setFilterBitmap(true); 
    paint.setDither(true); 
    canvas.drawARGB(0, 0, 0, 0); 
    paint.setColor(Color.parseColor("#BAB399")); 
    canvas.drawCircle(sbmp.getWidth() / 2+0.7f, sbmp.getHeight() / 2+0.7f, 
            sbmp.getWidth() / 2+0.1f, paint); 
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
    canvas.drawBitmap(sbmp, rect, rect, paint); 
 
 
            return output; 
} 
 
}