BitmapFactory.decodeFile() returns null value for a camera picture

Question

I have an android app where I go to the camera activity and take a photo, and then I execute the following code:

        String s1 = file_uri.getPath();
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        bitmap = BitmapFactory.decodeFile( s1, options);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 50,  stream);

where the file_uri is the image path from the phone storage (it is not null) bitmap variable is null. Why?

You are using the uri.getPath() as the actual path to your file. Instead, you should [get the real path from Uri](http://stackoverflow.com/questions/3401579/get-filename-and-path-from-uri-from-mediastore). — MohanadMohie, Nov 05 '16 at 15:42
I honestly don't know the difference. [This answer](http://stackoverflow.com/questions/176264/what-is-the-difference-between-a-uri-a-url-and-a-urn/1984225#1984225) might clarify things a little bit, but I still get confused about them. — MohanadMohie, Nov 05 '16 at 16:47

score 0 · Answer 1 · answered Nov 05 '16 at 15:35

0

your image may be too big and you get out of memory

answered Nov 05 '16 at 15:35

Andrew

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what should I do now? – Nov 05 '16 at 15:36

greenapps · Answer 2 · 2016-11-05T16:01:47.767

    options.inJustDecodeBounds = true;
    bitmap = BitmapFactory.decodeFile( s1, options);

After those statements bitmap is always null'. That's normal.

    options.inJustDecodeBounds = false;
    bitmap = BitmapFactory.decodeFile( s1, options);

Now you can have a bitmap. If not then the bitmap would be to big for available memory and decodeFile() had returned null;

Then you should resize your image. In variable options you can find the width and heigth of the image. With knowing pixels width and height you could calculate a scale factor. Or just say int scale = 8;`.

   options.inSampleSize = scale;

After that do another call like

    options.inJustDecodeBounds = false;
    bitmap = BitmapFactory.decodeFile( s1, options);

Presise code for this has been posted many times on stackoverflow.

Then show the adapted cods in a new code block in your original post. — greenapps, Nov 05 '16 at 16:09

BitmapFactory.decodeFile() returns null value for a camera picture

2 Answers2