NullPointerException on findViewById() in android

Question

In the following code i get a NullPointerException on lines 9/10 with findViewById().
In my main class I just instantiated an object from this class, to use .getFrom()

Answer 1

First , you should call the setContentView(int layout) ,in order to set the Content of your Activity , and then you can get your Views ( findViewById(int id) ) ;

So your Activity will be like this :

public class UserInteraction extends Activity {
EditText etFrom;
int from;
EditText etTill;
int till;

public void onCreate(Bundle savedInstance{
   super.onCreate(saveInstance);
   this.setContentView(R.layout.main);

   etFrom = (EditText)findViewById(R.id.et_from);
   etTill = (EditText)findViewById(R.id.et_till);
} 

}