FileNotFoundException when try to upload a image in AsynTask thread

Question

Following are my code in AsynTask thread:

File f = new File(Environment.getExternalStorageDirectory()+"/DCIM/IMG_20140210_130057.jpg");
 boolean exist=f.exists(); //debug result exist=false.

This code fires FileNotFoundException but the file is there.

I have already added following permission.

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

have you seen that? http://stackoverflow.com/questions/5453708/android-how-to-use-environment-getexternalstoragedirectory — nikis, Feb 20 '14 at 12:48
Thank you all. After serveral trying. I found the problems is in the AsynTask . Because when i get the File code in the MainActivity UI thread, file.exists return true. But in AsynTask execution, file.exists return false. How can it be like this? — cc5zhenhua, Feb 20 '14 at 14:59
Thanks all one more time. I finally get the problem that, in AsyncTask, when passing parameter from List to List, when convert object Back to String, it automationcally added [/mnt/sdcard...] ,this cause the FileNotFound exception. Sorry for your time. — cc5zhenhua, Feb 20 '14 at 15:51

score 0 · Answer 1 · answered Feb 20 '14 at 12:47

0

use

File.separator

instead of '/' character that might help

answered Feb 20 '14 at 12:47

Shabbir Dhangot

hey look sometime .jpg, .jpeg, .JPG , seems different make sure with the extension of the file – Shabbir Dhangot Feb 20 '14 at 15:12
Thank you. I found that in MAIN activity thread, file.exists()return true but in AsycnTask's execution, file.exists()return false. So the problem is a high possibility related with the AsycnTask. – cc5zhenhua Feb 20 '14 at 15:14

score 0 · Accepted Answer · answered Feb 20 '14 at 13:05

0

Have you forgot to call getAbsolutePath() method ?

Try this way,

File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/DCIM/IMG_20140210_130057.jpg");

answered Feb 20 '14 at 13:05

Lucifer

Tried, file.exists() still return false. Thank you. – cc5zhenhua Feb 20 '14 at 14:50
@cc5zhenhua for which device you are testing ? – Lucifer Feb 21 '14 at 03:10
You're the first guest. Thank you. – cc5zhenhua Feb 21 '14 at 06:03

score 0 · Answer 3 · answered Feb 20 '14 at 13:13

0

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

Also, try to log the file path.

Log.d("Path:",Environment.getExternalStorageDirectory()+"DCIM/IMG_20140210_130057.jpg");

answered Feb 20 '14 at 13:13

PsyGik

THe path in the log is: /mnt/sdcard/DCIM/IMG_20140210_130057.jpg. The file just be in the same location. – cc5zhenhua Feb 20 '14 at 14:49

3 Answers3