How to work with large bitmap. Rotating and inserting to the gallery

Question

I need to take a picture with the camera and, if depending on the picture size, rotate it before saving it into the gallery.

I'm using

Intent imageCaptureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); imageCaptureIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri); startActivityForResult(imageCaptureIntent, IMAGE_CAPTURE);

To take the pic and save it to a temporary file.

Then

Bitmap bmp = BitmapFactory.decodeFile(imagePath);
String str = android.provider.MediaStore.Images.Media.insertImage(cr, bmp, name, description);

To save it.

This is the code i have tried to use to rotate the bitmap

Matrix matrix = new Matrix();
matrix.postRotate(180);
Bitmap x = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
android.provider.MediaStore.Images.Media.insertImage(cr, x, name, description);

The problem is I'm getting an OutOfMemoryException.

Is there a better way to handle the bitmaps to avoid breaking the memory?

~Thanks in advance, regards

score 2 · Accepted Answer · answered Nov 18 '10 at 18:48

I don't think there is a better way to handle bitmaps. You could try to parse data directly from a file as Byte[] a portion at a time, and manipulating it in pieces; it's hard and you'll probably end up with very ugly code.

I also suggest the following:

Use android.provider.MediaStore.Images.Media.insertImage(cr, imagePath, name, description) instead of android.provider.MediaStore.Images.Media.insertImage(cr, bmp, name, description) this way there is no need to call Bitmap bmp = BitmapFactory.decodeFile(imagePath) and no bitmap will be loaded into memory at that point.
Throughout your code, make sure no bitmap is loaded unless needed. Set bitmaps that are no longer needed to null and call the garbage collector, or use bmp.recycle().

bmp.recycle() wont help here cuz you can actually do it right AFTER you catch OOM. I mean after rotating bitmap and saving it. However the OOM most probably comes at rotating moment since it has to keep 2 same bitmaps in RAM there. — Stan, Feb 16 '15 at 07:14

score 0 · Answer 2 · edited May 23 '17 at 12:20

I had the same issue with rotating bitmap. The problem here:

    Bitmap bmp = BitmapFactory.decodeFile(imagePath); //this is the image you want to rotate
    // keeping in mind that you want to rotate the whole original image instead
    // of its downscaled copy you cant use BitmapFactory downscaling ratio
    Matrix matrix = new Matrix();
    matrix.postRotate(180);
    Bitmap x = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true); 
    // the line above creates another bitmap so we have here 2 same sized bitmaps
    // even using the same var (bmp instead of x) wont change anything here
    // so you gonna get the OOM here

is that it creates 2 bitmaps so they want x2 more RAM.
Check my question and solution here. I bet for ImageMagick lib.

How to work with large bitmap. Rotating and inserting to the gallery

2 Answers2