How to Create a File on Android Internal Storage

Android: how to write a file to internal storage

Use the below code to write a file to internal storage:

public void writeFileOnInternalStorage(Context mcoContext, String sFileName, String sBody){      
    File dir = new File(mcoContext.getFilesDir(), "mydir");
    if(!dir.exists()){
        dir.mkdir();
    }

    try {
        File gpxfile = new File(dir, sFileName);
        FileWriter writer = new FileWriter(gpxfile);
        writer.append(sBody);
        writer.flush();
        writer.close();
    } catch (Exception e){
        e.printStackTrace();
    }
}

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Starting in API 19, you must ask for permission to write to storage.

You can add read and write permissions by adding the following code to AndroidManifest.xml:

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

You can prompt the user for read/write permissions using:

requestPermissions(new String[]{WRITE_EXTERNAL_STORAGE,READ_EXTERNAL_STORAGE}, 1);

and then you can handle the result of the permission request in onRequestPermissionsResult() inside activity called from it.

how to create a folder and file in internal storage using kotlin

ok got it,not specifying proper path.

        val data: String = "om namah shivaya"
        val path = this.getExternalFilesDir(null)

        val folder = File(path, "avalakki")
        folder.mkdirs()

        println(folder.exists()) // u'll get true 

        val file = File(folder, "file_name.txt")
        file.appendText("$data")

then to check this, navigate to

Android -> data -> com.your.pkg_name -> files ->

There will see files got created.

note:- we can use different paths

val path = this.externalCacheDir

Android -> data -> com.your.pkg_name -> cache ->

val path = this.externalMediaDirs.first()

Android -> media

val path = this.getExternalFilesDirs(null).first()

val path = Environment.getExternalStorageDirectory().getPath()

print and check what the path is.

How could I create a file in the Internal Storage Directory?

After a while later I found the answer to this question.

public void createDirectory() {
    File file = new File(Environment.getExternalStorageDirectory(), "/test");
    if (!file.exists()) {
        file.mkdirs();
        Log.w("DEBUG", "Created default directory.");

    }
}

This is how you create it code wise. The reason it wasn't creating was due to Samsungs weird permissions.

Make sure you have the storage permission enabled in Settings -> Apps -> App Name -> Permissions. I needed to turn it on so it would create the folder.

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