android - 如何以编程方式使图像角变圆

Question

我正在使用 TextView 。它有一个图像作为背景。如何以编程方式将此图像的角圆角？

Answer 1

将您的图像转换为位图，然后将该位图转换为圆角位图。最后将该位图应用于您的 TextView 背景。以下代码用于将位图转换为圆形位图图像。

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,int roundPixelSize) { 
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); 
    Canvas canvas = new Canvas(output); 
    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 = roundPixelSize;
    paint.setAntiAlias(true);
    canvas.drawRoundRect(rectF,roundPx,roundPx, paint);
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint); 
    return output; 
}