Android缩小大图像尺寸

Question

如果手机上有图像，我想发送到1mb或更高的服务器，我希望将该图像缩小并缩小至较小的尺寸，而不会干扰原始图像。我知道如何从电话中获得答案，并且我也知道如何将它发送给服务器，我只需要知道如何缩小图像，因为大于1mb的大文件会给我带来问题。

Answer 1

可以缩放位图如下所示：

// Load in your bitmap here, I'll leave this detail up to you 
Bitmap _bitmapPreScale = BitmapFactory.decodeResource(resources, fieldValue); 

int oldWidth = _bitmapPreScale.getWidth(); 
int oldHeight = _bitmapPreScale.getHeight(); 
int newWidth = width; // whatever your desired width and height are 
int newHeight = height; 

// calculate the scale 
float scaleWidth = ((float) newWidth)/oldWidth; 
float scaleHeight = ((float) newHeight)/oldHeight; 

// create a matrix for the manipulation 
Matrix matrix = new Matrix(); 
// resize the bit map 
matrix.postScale(scaleWidth, scaleHeight); 

// recreate the new Bitmap 
Bitmap _bitmapScaled = Bitmap.createBitmap(_bitmapPreScale, 0, 0, oldWidth, oldHeight, matrix, true); 

Answer 2

从原始的位图，你可以使用createScaledBitmap(...) 然而，困难可能是open the large image in the first place。