How do I declare a TextView variable so that I can use it anywhere?

Question

I have started coding in java/android just today so excuse me if I am being a total idiot here.

I have been facing this problem for the past hour, I have tried to go

Answer 1

You have to instantiate the variable after the setcontentView method was called, so you have to do the following:

public class MainActivity extends Activity {

TextView test;

@Override
onCreate(Bundle s){
    ...
    setContentView(R.layout.yourLayout);
    test = (TextView)findViewById(R.id.textView2);
}


public void registermessage(View view) {

    test.setText("Test");
}

Answer 2

Declare it as a variable of your activity and initialize it after calling setContentView(). There is no need to pass a View parameter in your function if you're just setting the text of your TextView.

public class MainActivity extends Activity {

    private TextView test;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_launch);
        test = (TextView)findViewById(R.id.textView2);
        registermessage();
    }

    public void registermessage() {    
        test.setText("Test");
    }