android圖片轉,圓形和圓角矩形

android 圖片轉 圓形和圓角矩形,比較高效的方法
圓角矩形:
int w = getWidth();
        int h = getHeight();
        Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint(1);
        paint.setColor(0xff000000);
        RectF rectf = new RectF(0F, 0F, w, h);
        canvas.drawRoundRect(rectf, cornerRadius, cornerRadius, paint);
        return bitmap;

圓形:

int w = getWidth();
        int h = getHeight();
        Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint(1);
        paint.setColor(0xff000000);
        RectF rectf = new RectF(0F, 0F, w, h);
        canvas.drawOval(rectf, paint);
        return bitmap;

摘自 劉群博客

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