ANDROID笔记:圆形ImageView

 

public static Bitmap toRoundCorner(Bitmap bitmap, float pixels) {

        System.out.println("图片是否变成圆角模式了+++++++++++++");

        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);

        System.out.println("pixels+++++++" + pixels);



        return output;

    }

}

调用方法:

ImageView imageView = (ImageView) findViewById(R.id.imageView1);

        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),

                R.drawable.ii);
　　　　//可以设置bitmap.getWidth()/2做半径

        imageView.setImageBitmap(toRoundCorner(bitmap,80.f));

 

效果: