Question

I want to know whether it is possible to write data in /etc folder (or any other folder besides data)? If yes, how to do that?

And if not possible, any way to store a permanent data? For scenario example, an app is uninstalled (or clear data), but a specific file will still remain.

thank you.

Answer 1

i’m not sure about /etc folder, but the stuff saved in /data folder is managed by android automatically itself. So when you uninstall an app, anything related to it is also removed from data folder.

However, to store a file permanently besides Data folder on your SdCard, see the code below:

public static boolean saveOnFile(String msg){
        boolean saved = false;

        String filename = "yourFileName.extension";

        try{
            if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){
                File root = new File(Environment.getExternalStorageDirectory(), "/YourFolderOnSdCard/");

                //create root folders if they do not exist
                if(!root.exists()){
                    root.mkdirs();
                }

                //now lets save file in our directory structure
                File file = new File(root, filename);

                FileWriter fw = new FileWriter(file);
                fw.append(msg);
                fw.flush();
                fw.close();

                saved = true;
            }
            else
                Log.e("Save", "Mounted media is not available or is write-protected");
        }
        catch (Exception e) { Log.e("Save", e.toString()); }

        return saved;
    }