Android中圆形的imageView

原创：http://blog.csdn.net/jjding1986/article/details/8141465

[java]
view plaincopy





package com.example.testsam;

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.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
* 圆形的Imageview
* @since 2012-11-02
*
* @author bingyang.djj
*
*/
public class CircleImageView extends ImageView {
private Paint paint = new Paint();

public CircleImageView(Context context) {
super(context);
}

public CircleImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

@Override
protected void onDraw(Canvas canvas) {

Drawable drawable = getDrawable();
if (null != drawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
Bitmap b = toRoundCorner(bitmap, 14);
final Rect rect = new Rect(0, 0, b.getWidth(), b.getHeight());
paint.reset();
canvas.drawBitmap(b, rect, rect, paint);

} else {
super.onDraw(canvas);
}
}

private 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 Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
int x = bitmap.getWidth();
canvas.drawCircle(x / 2, x / 2, x / 2, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}