NullPointerException - Attempt to get length of null array (readDirectory())

Question

I have the code as shown here. My Problem is a NullPointerException at files.length

for(int i=0; i < files.length; i++){

It is caused b

Answer 1

f.listFiles()

will return null if the path does not exist.

Please check your path.

Update

Android will also require a permission to read certain files. Maybe you need to add this to your manifest:

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

More information:

http://developer.android.com/reference/android/Manifest.permission.html

Answer 2

i have check the condition

File folderPath = new File(getFilesDir() + "/" + getResources().getString(R.string.app_name));

    if (folderPath.exists()) {}

for my code and it works for me becuase when this file attemp to read data there were no directory exist on the storage so that it was giving error.

now works fine