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Question

Problem

I want to read some files (in binary format is ok – i do not need to decode them, just read and copy) created by the DJI Fly software. I have tried to create an app that runs as a background service in Kotlin.

My code

private fun initFileObserver() {


    val projection = arrayOf(
        MediaStore.Files.FileColumns._ID,
        MediaStore.Files.FileColumns.DISPLAY_NAME,
        MediaStore.Files.FileColumns.SIZE
    )

    val selection = "${MediaStore.Files.FileColumns.DATA} LIKE ?"
    val selectionArgs = arrayOf("$flightRecordsPath/%")

    val sortOrder = "${MediaStore.Files.FileColumns.DATE_ADDED} DESC"

    val queryUri = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL)



    val contentResolver = context.contentResolver
    val cursor = contentResolver.query(
        queryUri,
        projection,
        selection,
        selectionArgs,
        sortOrder
    )

    cursor?.use {
        val idColumn = it.getColumnIndexOrThrow(MediaStore.Files.FileColumns._ID)
        val nameColumn = it.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DISPLAY_NAME)
        val sizeColumn = it.getColumnIndexOrThrow(MediaStore.Files.FileColumns.SIZE)

        var ic = it.count
        Log.d("monsoonParasiteRDR", "cursor $it, $ic")
        while (it.moveToNext()) {

            Log.d("monsoonParasiteRDR", "$it")

            val id = it.getLong(idColumn)
            val name = it.getString(nameColumn)
            val size = it.getLong(sizeColumn)

            if (name.endsWith(".txt")) {
                val uri = ContentUris.withAppendedId(queryUri, id)
                val inputStream = contentResolver.openInputStream(uri)
                val text = inputStream?.bufferedReader().use { it?.readText() }

                // Do something with the text
                Log.d("monsoonParasiteRDR", "File: $name, Size: $size, Content: $text")
            }
        }
    }

    val directory = File(Environment.getExternalStorageDirectory(), flightRecordsPath)


    if (directory.exists()) {

        Log.d("monsoonParasiteRDR", "Directory successfully located: $directory")

    } else {
        Log.d("monsoonParasiteRDR", "Directory does not exist: $directory")
    }

    val files = directory.listFiles()
    Log.d("monsoonParasiteRDR", "got files $files")

    if (files != null && files.isNotEmpty()) {
        files.forEach { file ->
            Log.d("monsoonParasiteRDR", "File: ${file.name}, Size: ${file.length()} bytes")
        }
    } else {
        Log.d("monsoonParasiteRDR", "No files found in the directory.")
    }


    Log.d("monsoonParasiteRDR", "got it")
    fileObserver = object : FileObserver(flightRecordsPath, CREATE) {
        override fun onEvent(event: Int, path: String?) {
            Log.d("monsoonParasiteRDR","running: $event")

            if (event == CREATE && path != null) {
                val file = File("$flightRecordsPath/$path")
                val content = file.readText()
                Log.d("monsoonParasiteRDR","new file found")
                sendContentViaWebSocket(content)
            }
        }
    }
    fileObserver.startWatching()
 } 



Now, The app runs in background, via a service. The app is able to run as a background service. The output in logcat is:

2024-08-08 14:05:21.075  8264-8264  monsoonParasite         org...sky.monsoon.parasitetelemetry  D  Starting operation
2024-08-08 14:05:21.076  8264-8264  monsoonParasite         org...sky.monsoon.parasitetelemetry  D  Starting service
2024-08-08 14:05:21.076  8264-8264  monsoonParasite         org...sky.monsoon.parasitetelemetry  D  Starting reader service
2024-08-08 14:05:21.180  8264-8264  monsoonParasiteRDR      org...sky.monsoon.parasitetelemetry  D  cursor android.content.ContentResolver$CursorWrapperInner@54733e7, 0

Break intentional. Note this line:

2024-08-08 14:05:21.181  8264-8264  monsoonParasiteRDR      org...sky.monsoon.parasitetelemetry  D  Directory successfully located: /storage/emulated/0/Download

Break intentional, note the subsequent output:

2024-08-08 14:05:21.181  8264-8264  monsoonParasiteRDR      org...sky.monsoon.parasitetelemetry  D  got files null
2024-08-08 14:05:21.181  8264-8264  monsoonParasiteRDR      org...sky.monsoon.parasitetelemetry  D  No files found in the directory.
2024-08-08 14:05:21.181  8264-8264  monsoonParasiteRDR      org...sky.monsoon.parasitetelemetry  D  got it

So I am able to open the directory. If I check the directory via adb shell, I see the files.

DJIFlightRecord_2023-11-05_[16-44-49].txt DJIFlightRecord_2023-11-29_[13-13-16].txt DJIFlightRecord_2023-12-07_[12-03-57].txt DJIFlightRecord_2023-12-13_[13-10-43].txt DJIFlightRecord_2024-03-28_[16-12-03].txt 
DJIFlightRecord_2023-11-12_[14-55-26].txt DJIFlightRecord_2023-11-29_[13-19-17].txt DJIFlightRecord_2023-12-07_[12-14-12].txt DJIFlightRecord_2023-12-17_[13-44-36].txt DJIFlightRecord_2024-03-28_[16-54-45].txt 
DJIFlightRecord_2023-11-13_[11-29-02].txt DJIFlightRecord_2023-11-29_[13-29-33].txt DJIFlightRecord_2023-12-07_[12-19-24].txt DJIFlightRecord_2023-12-17_[13-50-12].txt DJIFlightRecord_2024-03-31_[12-57-35].txt 
DJIFlightRecord_2023-11-29_[12-22-15].txt DJIFlightRecord_2023-12-07_[11-40-37].txt DJIFlightRecord_2023-12-07_[12-32-25].txt DJIFlightRecord_2023-12-17_[13-57-33].txt DJIFlightRecord_2024-03-31_[13-07-54].txt 
DJIFlightRecord_2023-11-29_[13-04-43].txt DJIFlightRecord_2023-12-07_[11-48-21].txt DJIFlightRecord_2023-12-07_[12-50-51].txt DJIFlightRecord_2023-12-17_[15-34-16].txt MCDatFlightRecords                        
DJIFlightRecord_2023-11-29_[13-11-08].txt DJIFlightRecord_2023-12-07_[11-54-59].txt DJIFlightRecord_2023-12-07_[13-04-31].txt DJIFlightRecord_2023-12-18_[11-35-20].txt dgdhgdh.txt                               
DJIFlightRecord_2023-11-29_[13-12-17].txt DJIFlightRecord_2023-12-07_[12-00-26].txt DJIFlightRecord_2023-12-12_[12-52-52].txt DJIFlightRecord_2024-01-01_[15-46-59].txt test.txt

The last two files are manually created by me.

Problem

Unfortunately, all these files have permission -rw-rw---- , and belong to the group sdcard_rw . So as seen in the last part of my output, the file iterator is null.

Question

What can I do? I have tried to use direct reading (not just mediastore).

DJI is not going to give me intent or fileprovider. What other option do I have?

Thank you

Additional

We have Android 10. Here is my manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" package="org.opensky.monsoon.parasitetelemetry">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service
            android:name=".DJIFileReaderService"
            android:enabled="true"
            android:exported="false" />
    </application>



</manifest>

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Danh mục

Reading files generated by another app in andrid 10