Question

I have an Activity where names are inputed via a EditText box and then they get saved into an Array and then displayed in a ListView where there is also a Button that will appear where they can remove it.

Once the correct names have been added they are then passed to the next Activity by a Button Intent to populate a String. On the next Activity there is a button where they can go back to the previous Activity to add more names or remove.

The problem is when they go back to the previous Activity the Array is empty so I need a way to save the Array even when the Activity has been left.

ArrayList<String> playerList = new ArrayList<String>();

Button to add to the Array is below:

Button confirm = (Button) findViewById(R.id.add);
confirm.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        EditText playername = (EditText) findViewById(R.id.userinput);
        playerList.add(playername.getText().toString());
        adapter.notifyDataSetChanged();
        playername.setText("");
    }
});

Answer 1

Use Bundle to save your array on onSaveInstanceState(Bundle savedInstanceState) of activity

1. http://developer.android.com/reference/android/os/Bundle.html
2. Saving Android Activity state using Save Instance State

Update

    @Override
public void onSaveInstanceState(Bundle outState) {
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
    outState.putStringArrayList("Playlist", playerList );

   super.onSaveInstanceState(outState);

    }

Now to take value

    @Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
    playerList = savedInstanceState.getStringArrayList("Playlist");

}