android - save file to internal storage

Question

I know this is a double post but the other threads didn't answer my question. I want to write a file to the directory of my app inside the Android directory in the internal storage

I added the permission to the manifest:

Manifest.xml Code:

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

and Java code:

 File myPath = new File(getFilesDir(), "test.dat");            
    myPath.mkdirs();
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(myPath);
        fos.write(bytes);
    } catch (Exception e) {

    }

however the directory for my app is not created and I cannot find the filename via search.

EDIT: there is actually a FileNotFoundException thrown, my bad. But I thought that mkdirs() would create all missing directories.

Answer 1

You can try with below:

ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
File directory = contextWrapper.getDir(getFilesDir().getName(), Context.MODE_PRIVATE);
File file =  new File(directory,”fileName”);
String data = “TEST DATA”;
FileOutputStream fos = new FileOutputStream(“fileName”, true); // save
fos.write(data.getBytes());
fos.close();

This will write the file in to the Device's internal storage at /data/user/0/com.yourapp/

Answer 2

try this way

 String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/filename";

            File dir = new File(path);
            if (!dir.exists())
                dir.mkdirs();

           // File file = new File(dir, "filename");

Answer 3

however the directory for my app is not created and I cannot find the filename via search.

You, as a user, have no access to your app's portion of what the Android SDK refers to as internal storage , which is what you are using.

Users have access to what the Android SDK refers to as external storage .

Answer 4

I cannot make comments, due to too low reputation, so I need to answer this way. I would slightly modify #AndroidDevUser answer, changing:

FileOutputStream fos = new FileOutputStream(“fileName”, true);

with

fos = new FileOutputStream(file, true);

Additionally I would add try / catch block.

    ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
    File directory = contextWrapper.getDir(getFilesDir().getName(), Context.MODE_PRIVATE);
    File file =  new File(directory,"fileName");
    String data = "TEST DATA";
    FileOutputStream fos = null; // save
    try {
        fos = new FileOutputStream(file, true);
        fos.write(data.getBytes());
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }