BitmapFactory.decodeFile is null

Question

I tried several ways but it always returns 'null'.

I want to read a file from the camera folder into a bitmap object.

File camDir = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/DCIM/Camera");
    File[] files = camDir.listFiles();
    Bitmap img = BitmapFactory.decodeFile(files[1].getAbsolutePath());
    img.getDensity();

Where is my mistake?

Maybe it is long because the image is too large, can you put a try catch and get the exception? — Skizo-ozᴉʞS ツ, Jan 14 '16 at 15:18
You are assuming that `files[1]` is going to point to a bitmap. Also, this will only work if you have `READ_EXTERNAL_STORAGE`, and depending upon your device OS version and `targetSdkVersion`, you may need to request that permission from the user at runtime. — CommonsWare, Jan 14 '16 at 15:19
Why you don't use this? : `File camDir = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera");` — Skizo-ozᴉʞS ツ, Jan 14 '16 at 15:22
@Skizo The try/catch don't catching it and maybe it is to large because it is about 3-4MB — Simon Dzn, Jan 14 '16 at 15:25
@CommonsWare I have all the permissions that need, nad I just want to get one file from the camera folder — Simon Dzn, Jan 14 '16 at 15:27

score 1 · Accepted Answer · edited May 23 '17 at 11:59

If you don't know what's the null you can add a simple try()catch(Exception e) and then e.printstacktrace(); to get the error.

If the error is about outOfMemory try this answer;

Also, you may try this trick :

File camDir = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/DCIM/Camera");
File[] files = camDir.listFiles();
FileInputStream FI = new FileInputStream (files[1].getAbsolutePath());
Bitmap img = BitmapFactory.decodeStream(FI);
img.getDensity();

Another try that I mentioned to you on comments you can remove the getAbsolutePath() and do it as follows :

File camDir = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera");

score 1 · Answer 2 · answered Jan 14 '16 at 15:49

Thank you all for the help!!

I found that the problem was the "getAbsolutePath()" I don't understand why but it works..

I changed this:

File camDir = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/DCIM/Camera");

To:

File camDir = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera");

And it works!

BitmapFactory.decodeFile is null

2 Answers2