CODEWITHSUNDEEP
javaandroid
Ben Ajax
Ben Ajax

Reputation: 740

Saving view state android while app restarted

I am currently new to android and am working on a note taker application so please be patient with me. Inside the menu, i implemented an option whereby the user can change view if desired (List or Grid).

 LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View customTitleView = inflater.inflate(R.layout.dialog_menu, null);
        mListViewSelect = (LinearLayout) customTitleView.findViewById(R.id.list_select);
        mGridViewSelect = (LinearLayout) customTitleView.findViewById(R.id.grid_select);
case R.id.changeView:
                final AlertDialog alertbox = new AlertDialog.Builder(this).create();
                alertbox.setCancelable(true);
                alertbox.setView(customTitleView);
                alertbox.show();
                mListViewSelect.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        mListNotes.setVisibility(View.VISIBLE);
                        mGridNotes.setVisibility(View.GONE);
                        alertbox.dismiss();
                    }
                });
        mGridViewSelect.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mListNotes.setVisibility(View.GONE);
        mGridNotes.setVisibility(View.VISIBLE);
        alertbox.dismiss();
    }
});
        }
        return super.onOptionsItemSelected(item);
    }

This works perfectly. However, i want the app to open in the selected view initially selected by user. For example, if the user had closed the app while in gridview, the app should open in gridview while restarted.

I understand i need to save data persistently with shared preferences or something. But i need to know exactly what i need to do.

Upvotes: 1

Views: 127

Answers (2)

Igor Fridman
Igor Fridman

Reputation: 1297

If you want to save your data in Shared Preference, here is a way to do it.

First you need to create an instance of SharedPreferences and SharedPreferences.Editor:

private SharedPreferences settings = context.getSharedPreferences("*Desired preferences file", Context.MODE_PRIVATE);

*Desired preferences file. If a preferences file by this name does not exist, it will be created when you retrieve an editor (SharedPreferences.edit()) and then commit changes (Editor.commit()).

 private SharedPreferences.Editor editor = settings.edit();

If you need to save a String:

 editor.putString(key, val).commit()

Don't forget to do the .commit();

To get The String from SharedPreferences:

String str = settings.getString(key, "");

Saving Int:

just use:

editor.putInt(key, val).commit();

and so on.

Upvotes: 1

Calco
Calco

Reputation: 1460

You are correct that you need to persist data, you have options though. You say it is a note taking app, where are you saving your notes?

You could store your application's state in share preferences, described in the the docs here. You could store the applications state, as well as all the notes in a database, such as a relational database, of which there a tons of tutorials on and the main docs can be found here, or alternatively a database such as Realm, which saves objects to the database.

I would research into these options, and implement one. Then, on application launch, check the 'application state' that you have saved and adjust the UI accordingly!

Upvotes: 0

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