Question

Rounded Corner代码适用于Volley NetworkImageView和资源。但它不适用于ApplicationContext的Bitmap。以下是代码。

public class ImageViewUtils {
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
            bitmap.getHeight(), Bitmap.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);

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, pixels, pixels, paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
    }
}


public class Fragment{
     ......
     imageView.setImageBitmap(ImageViewUtils.getRoundedCornerBitmap(((AppContext) getActivity().getApplicationContext()).getUserPhoto(), 10); // The rounded corner doesn't work.

     imageView.setImageBitmap(ImageViewUtils.getRoundedCornerBitmap(BitmapFactory.decodeResource(getActivity().getResources(), R.drawable.ic_avatar), 10); // The rounded corner works.
     ......
}



public class AppContext extends Application {
    ......
    // Get the Bitmap of a photo.
    public Bitmap getUserPhoto(){

        FileInputStream in = null;
        try {
            in = openFileInput(KEY_USER_PHOTO_FILE_NAME);
            return BitmapFactory.decodeStream(in);
        } catch (IOException e) {
            Log.d(TAG, e.toString());
            return BitmapFactory.decodeResource(getResources(),R.drawable.ball);
        } finally {
            if(in != null) try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
    ......
}

以下是此ImageView的布局

        <ImageView
        android:id="@+id/logo"
        android:src="@drawable/ball"
        android:contentDescription="@string/title_activity_profile"
        android:padding="4dp"
        android:layout_height="@dimen/touchable_height_15"
        android:layout_width="@dimen/touchable_width_15"
        android:scaleType="fitXY" />

奇怪的是，它适用于资源，但它不适用于Bitmap对象。这困扰了我4个小时。有人可以解释一下吗？

Answer 1

可能您的图像分辨率太高，因此10px圆不可见，尝试使用更高的圆角半径值 - 它应该使其可见。

圆角不适用于openFileInput位图

1 个答案: