在android中制作图像循环

Question

我找到了很多圆角的样本代码.我需要的是圆形图像.我发现这个没问题,但输出不是完美的圆形.

ImageView im = (ImageView) findViewById(R.id.imag);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.white);
Bitmap circleBitmap = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), Bitmap.Config.ARGB_8888);
BitmapShader shader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP);
Paint paint = new Paint();
paint.setShader(shader);
Canvas c = new Canvas(circleBitmap);
c.drawCircle(bmp.getWidth() / 2, bmp.getHeight() / 2, bmp.getWidth() / 2, paint);
im.setImageBitmap(circleBitmap);

Answer 1

试试这个...

public static Bitmap getCircularBitmapFrom(Bitmap bitmap) {
    if (bitmap == null || bitmap.isRecycled()) {
        return null;
    }
    float radius = bitmap.getWidth() > bitmap.getHeight() ? ((float) bitmap
            .getHeight()) / 2f : ((float) bitmap.getWidth()) / 2f;
    Bitmap canvasBitmap = Bitmap.createBitmap(bitmap.getWidth(),
            bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    BitmapShader shader = new BitmapShader(bitmap, TileMode.CLAMP,
            TileMode.CLAMP);
    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setShader(shader);

    Canvas canvas = new Canvas(canvasBitmap);

    canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2,
            radius, paint);

    return canvasBitmap;
}