How to store a class object into Internal Memory Storage using serializable?

Question

I need to store this object into the internal storage memory of the phone, and i have the

Answer 1

You're not allowed to just write into the internal storage (even if you get that permission). Try it with the external sd or your cache folder instead.

Answer 2

change this

out = new ObjectOutputStream(new FileOutputStream("appSaveState.data"));

with

   File outFile = new File(Environment.getExternalStorageDirectory(), "appSaveState.data");
   out = new ObjectOutputStream(new FileOutputStream(outFile)); 

as correctly pointed out by @e-x, the file will not be removed clearing application's data or uninstalling the app

Answer 3

This was my aproach based on this post and this

I wrote this on my User class

private static File mFolder;
public void saveData(Activity pContext) {
    //this could be initialized once onstart up
    if(mFolder == null){
        mFolder = pContext.getExternalFilesDir(null);
    }
    this.save();
    ObjectOutput out;
    try {
        File outFile = new File(mFolder,
                "someRandom.data");
        out = new ObjectOutputStream(new FileOutputStream(outFile));
        out.writeObject(this);
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static User loadData(Context pContext) {
    if(mFolder == null){
        mFolder = pContext.getExternalFilesDir(null);
    }
    ObjectInput in;
    User lUser = null;
    try {
        FileInputStream fileIn = new FileInputStream(mFolder.getPath() + File.separator + "someRandom.data");
        in = new ObjectInputStream(fileIn);
        lUser = (User) in.readObject();
        in.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    if (lUser != null) {
        lUser.save();
        Log.d("current User: ", lUser.nickname);
    } else {
        Log.d("current User: ", "null");
    }
    return lUser;
}

Edit:

Then from my activity i call

mUser = User.loadData(mSelf);

or

mUser = User.loadData(this);

mSelf would be an instance I store

Hope this helps :)