BitmapFactory.decodeFile() returns null

Question

I am creating an Android app in which you copy an image from location x to location y. After the copying is complete I would like to see the picture in a ImageView. I know the images location, but no matter what I try I can't create a bitmap object of it.

The line which are causing my problems is this:

BitmapFactory.decodeFile(dir+s);

dir = getCacheDir().getAbsolutePath()+"/images/";

s = file name (eg. 1275123123.jpg)

If I create a File object with the same path, and call f.isFile(), it returns true.

Opening the image in either android or windows are not a problem.

Have you checked http://stackoverflow.com/questions/6013029/android-decodefile-always-returns-null-for-file-in-internal-storage — Ryhan, May 13 '13 at 21:17
@blackbelt /data/data/net.hath.snapcap/cache/images/file.jpg — MartinHaTh, May 13 '13 at 21:17

score 7 · Answer 1 · answered Sep 17 '14 at 11:37

7

Didn't you forget to add SD card access permissions READ_EXTERNAL_STORAGE and/or WRITE_EXTERNAL_STORAGE ?

answered Sep 17 '14 at 11:37

zedrummer

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score 2 · Answer 2 · answered May 13 '13 at 22:20

2

I had a similar problem and what eventually solved it was creating FileInputStream(...) and decoding the stream. This is the code I used, I changed it to suite your case:

File location = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+ "/images");
File dest = new File(location, fileName + ".JPG");
FileInputStream fis;
fis = new FileInputStream(dest);
Bitmap img = BitmapFactory.decodeStream(fis);

answered May 13 '13 at 22:20

Aviel Gross

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I'm getting FileNotFoundException no creating fis. While File object is fine. Please help – Hussain Mansoor Oct 07 '13 at 07:06
1

No need to do this. `decodeFile` calls `decodeStream` itself: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.4.2_r1/android/graphics/BitmapFactory.java#BitmapFactory.decodeFile%28java.lang.String%29 – Or B Feb 22 '14 at 00:46

score -1 · Answer 3 · answered May 18 '20 at 15:55

You have to add

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

permissions to you manifest.

And please don't forget to request runtime permission from user.

BitmapFactory.decodeFile() returns null

3 Answers3

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