如何压缩图像？

Question

I am working on a project in android studio where I am uploading images. Some of the images are very large in size and I want to compress before upload them in the app. Can anyone please suggest me soemthing?

Answer 1

You can use this code to compress images

Bitmap imageBitmap;
int newHeight  = 20 // define your height here
int newWidth = 30 //define new height 
Bitmap resizedBitmap = Bitmap.createScaledBitmap(imageBitmap,newWidth, 
               newHeight, 
                         true);

https://developer.android.com/reference/android/graphics/Bitmap.html see documentation for details.

Answer 2

使用此库压缩任何文件： https : //github.com/zetbaitsu/Compressor

Answer 3

try this function

 public static Bitmap scaleDown(Bitmap realImage, float maxImageSize, boolean filter) {

    float ratio = Math.min(
            maxImageSize / realImage.getWidth(),
            maxImageSize / realImage.getHeight());
    int width = Math.round(ratio * realImage.getWidth());
    int height = Math.round(ratio * realImage.getHeight());

    Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
            height, filter);
    return newBitmap;
}