Question

I have an simple android app that I want to write on the display the value of a single field, that belongs to a different class.

Using the simple text view I can write the initial value of the field but I don’t know how to update the text on the display whenever the field has changed value.

Btw, it is my first android app so im still lost

Here is my activity code:

public class findIT extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    PositionHolder ph = new PositionHolder();
    TextView tv = new TextView(this);
    setContentView(tv);
    //this.updateText();
    tv.setText("You are at "  + ph.getPosition());
  }
}

Answer 1

You need to create a TextView in an xml layout as following:

<TextView 
android:id="@id/textView01"
android:text="Enter your initial text "
android:layout_width="wrap content"
android:layout_height="wrap content"
></TextView>

Then write the following in your class after setContentView() function:

TextView textView = (TextView) findViewById(R.id.textView01);
textView.setText("Enter whatever you Like!");