android - 如何将位图调整为最大可用大小？

Question

我有非常大的位图图像。我的来源

BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(new FileInputStream(f), null, o);

            // The new size we want to scale to
            final int REQUIRED_WIDTH = 1000;
            final int REQUIRED_HIGHT = 500;
            // Find the correct scale value. It should be the power of 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= REQUIRED_WIDTH
                    && o.outHeight / scale / 2 >= REQUIRED_HIGHT)
                scale *= 2;

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);

我想正确调整图片大小，我需要将图片调整到最大可用大小

例如

我下载的图片大小为 4000x4000 像素，我的手机支持 2000x1500 像素大小我需要 anderstend 我的手机支持多大尺寸？然后我将图像调整为 2000x1500(例如)

Answer 1

在这里你可以调整位图到最大可用尺寸:

public void onClick() //for example 
{
/*
Getting screen diemesions
*/
WindowManager w = getWindowManager();
        Display d = w.getDefaultDisplay();
        int width = d.getWidth();
        int height = d.getHeight(); 
// "bigging" bitmap
Bitmap nowa = getResizedBitmap(yourbitmap, width, height);
}

public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {

int width = bm.getWidth();

int height = bm.getHeight();

float scaleWidth = ((float) newWidth) / width;

float scaleHeight = ((float) newHeight) / height;

// create a matrix for the manipulation

Matrix matrix = new Matrix();

// resize the bit map

matrix.postScale(scaleWidth, scaleHeight);

// recreate the new Bitmap

Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);

return resizedBitmap;

}

希望对你有帮助