How to avoid OutOfMemory ex while rotating the image?

Question

public static boolean rotateBitmapByExifAndSave(File targetFile){

  if (targetFile==null || !targetFile.exists() || !targetFile.canRead() || !targetFile.canWrite())         


        

Answer 1

Make a method name decode file:

public static Bitmap decodeFile(File f,int WIDTH,int HIGHT){
         try {
             //Decode image size
             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=WIDTH;
             final int REQUIRED_HIGHT=HIGHT;
             //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);
         } catch (FileNotFoundException e) {}
         return null;
     }

then call this method like this (You can call this method in button click listener)

Bitmap bi = decodeFile(new File(path),1280,800);

Where path is the path of image where you save your image.. in my case it is

String path = Environment.getExternalStorageDirectory().toString() + "/nature.jpg";

In case of any problem - ask :) Hope this helps.

Answer 2

Since there was no answer I assume there is no answer or maybe I just had asked the question a bit incorrectly. It looks like the only option here is to increase the app's heap size
UPDATE:
There is also another option - to work with bitmaps via NDK/JNI like here or to use Android Image-Magic lib. The Image Magic lib is pretty cool, to rotate an image all you need is:

ImageInfo imageInfo = new ImageInfo(imageFile.getAbsolutePath());
MagickImage magickImage = new MagickImage(imageInfo);
magickImage.setCompression(100); // to minimize loss
magickImage.rotateImage(90.0f).writeImage(imageInfo);

MagickImage has many other image manipulating options as well. Blur, matte, scale, charcoal and many more. However its libraries size is noticable. Authors made a great job and they covered all possible plaforms: arm64-v8a, armeabi, armeabi-v7a, mips, mips64, x86, x86_64 and final size of all these libs is over 36Mb. So you should think before adding all the libs into one apk, maybe packaging 6 different versions using manifest to filter by chipset/platform is the right way.
UPDATE
Another option is to convert Immutable Bitmap into Mutable (wrap bitmaps into MappedByteBuffer)