.listfiles giving a null exception (in app error could not read images)

[vedant-creator]

Hi Shubham,
I wanted to test the efficiency of facenet tf lite model so i tried running your app but it always gives the toast as " could not read images make sure you have files according to readme "

I rebuild your app and added the google services file, i added all the READ/WRITE permissions and i found that imageDir give the proper director but imageDir.listfiles return a null exception. I have directories in the images folder as specified but it is unable to list them

[shubham0204]

The imageDir.listFiles() method would throw a NullPointerException maybe because the imageDir is itself null. As you said you have created the images directory correctly, make sure you have created this directory in the device's internal storage and not the external storage.

[shubham0204]

You may rebuild the project to check if the issue is solved. See this commit.

[vedant-creator]

I have no external sd card in my device, filepath which received in logcat was /storage/emaluated/0/images
i created folders in it as jeff_bezos and tested if it was a valid directory with isdirectory() it returned a true value, so I am not sure why .listfiles() method is returning null value

[vedant-creator]

Okay i will try to rebuild it again

[vedant-creator]

I tried the latest commit, still facing the same issue, I have added the logs for directory check and file path

 val imagesDir = File( Environment.getExternalStorageDirectory()!!.absolutePath + "/images" )
            val imagesSubDir1 = File( Environment.getExternalStorageDirectory()!!.absolutePath + "/images/vedant" )
            Log.w("fullpath", "" + imagesDir)
            if(imagesSubDir1.isDirectory){
                Log.w("fullpath", "yes" )
            }
            val imageSubDirs = imagesDir.listFiles()
            Log.w("fullpath", "" + imageSubDirs)
            if ( imageSubDirs == null ) {
                Toast.makeText( this , "Could not read images. Make sure you've have a folder as described in the README" ,
                        Toast.LENGTH_LONG ).show()
                return

Logcat output:

2020-09-17 21:34:51.211 16013-16013/com.ml.quaterion.facenetdetection W/fullpath: /storage/emulated/0/images
2020-09-17 21:34:51.211 16013-16013/com.ml.quaterion.facenetdetection W/fullpath: yes
2020-09-17 21:34:51.211 16013-16013/com.ml.quaterion.facenetdetection W/fullpath: null

[shubham0204]

@vedant-creator, thanks for the logs. I'll go through the issue once again and revert back to you. Also, please share your device's Android version so that I can resolve any issues with the API quickly.

[vedant-creator]

I am using Android 10
Thank you for the efforts i hope the issue get solved

[vedant-creator]

Hey @shubham0204 thanks for your support
I have solved the issue, in android 10 or API level above 29
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
android:requestLegacyExternalStorage="true"
needs to be added in manifest file