How do I actively check if EditText field is null or not?

Question

I am designing a text based game and I want it so that when a user enters something in an EditText field, other items on screen update accordingly. I tried doing the following in the onCreate method to no avail (probably because that method is only called when the activity is first created).

How do I actively check if a user inputted something in the field without them pressing a button and only by them typing something in the field?

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Typeface myTypeface;
    TextView myTextView;

    myTypeface= Typeface.createFromAsset(getAssets(), "fonts/script.ttf");



    EditText players = (EditText) findViewById(R.id.id_players);

    //while(players.getText().toString().matches("")) {}

    if(!players.getText().toString().matches(""))
        myTextView.setText(players.getText().toString()); //this is just to debug if it is actually working
}

score 1 · Answer 1 · answered Jul 28 '16 at 22:18

1

Use a TextWatcher on the field via addTextChangedListener.

answered Jul 28 '16 at 22:18

Gabe Sechan

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Should I put that in the onCreate method? – Tirth Allspark Rami Jul 28 '16 at 23:12

score 0 · Answer 2 · edited May 23 '17 at 12:32

0

You can find here the exact question with solution.

Simply use TextWatcher and implement its onTextChanged() where you'll be able to catch every change to the edit text.

edited May 23 '17 at 12:32

Community

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1

answered Jul 28 '16 at 22:20

Nativ

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Sorry beginner here, would I do this in the onCreate method as well? – Tirth Allspark Rami Jul 28 '16 at 22:56

How do I actively check if EditText field is null or not?

2 Answers2