Question

我需要将图像从圆形更改为普通正方形。

我是编程方面的新手，我在此代码中停留了2天，有人知道如何更改吗？

我已经尝试了一切，但无法解决

我对画布一无所知，我已经研究过解决此问题的方法，但是我仍然无法做到

public static Bitmap getCircleBitmap(Bitmap bitmap) {
    final int scaledWidth = 100;
    final int scaledHeight = 100;

    bitmap = Bitmap.createScaledBitmap(bitmap, scaledWidth, scaledHeight, true);
    Bitmap output;
    Rect srcRect, dstRect;

    float r;
    final int width = bitmap.getWidth();
    final int height = bitmap.getHeight();

    if (width > height) {
        output = Bitmap.createBitmap(height, height, Bitmap.Config.ARGB_8888);
        int left = (width - height) / 2;
        int right = left + height;
        srcRect = new Rect(left, 0, right, height);
        dstRect = new Rect(0, 0, height, height);
        r = height / 2;
    } else {
        output = Bitmap.createBitmap(width, width, Bitmap.Config.ARGB_8888);
        int top = (height - width) / 2;
        int bottom = top + width;
        srcRect = new Rect(0, top, width, bottom);
        dstRect = new Rect(0, 0, width, width);
        r = width / 2;
    }

    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);


    paint.setColor(color);
    canvas.drawCircle(r, r, r, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, srcRect, dstRect, paint);

    bitmap.recycle();

    return output;

}

public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
    Drawable drawable = AppCompatResources.getDrawable(context, drawableId);
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        drawable = (DrawableCompat.wrap(drawable)).mutate();
    }

    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
            drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}

}

Answer 1

如果您查看代码，则在方法 getCircleBitmap（）的结尾处，您将看到以下代码行：

canvas.drawCircle(r, r, r, paint);

这就是使用DrawCircle为您绘制圆形图像的人。您可以做的是，将其替换为DrawRect。那应该为你做那把戏。

但是，如果只需要从矢量绘制正方形图像，则可以直接使用标准的 ImageView 并将矢量用作图像资源。

如何在位图画布中将圆形转换为正方形图像？ Android Studio

1 个答案: