Question

This is my code :

public void onCreate(Bundle savedInstanceState)
{
   super.onCreate(savedInstanceState);
   TextView editTextDay = (TextView)findViewById(R.id.editTextDay);
   editTextDay.setVisibility(8);    //GONE
   setContentView(R.layout.main);
}

without the line ” editTextDay.setVisibility(8); ” the app doesn’t crash.

any idea on what’s wrong ?

Answer 1

you should set the content layout before any call of the method : findViewById() ;that’s why it return null . So your code will work like this :

public void onCreate(Bundle savedInstanceState)
{
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   TextView editTextDay = (TextView)findViewById(R.id.editTextDay);
   editTextDay.setVisibility(8);    //GONE

}