Question

I am 2 days old to Android Programming. I may be comitting a mistake at the core level. If this is the case, pardon.

I am trying to add a text box to a Relative Layout. When a button is clicked.
The method is bound to the button by the attribute android:onClick="method"

By doing the below.

public method (View view){
    RelativeLayout vRL = (RelativeLayout)findViewById(R.layout.rLayout);
    TextView vET = new TextView(this);
    vET.setText("Text added to view.");
    vET.setId(1);
    vRL.addView(vET);
    setContentView(R.layout.rLayout);
}

But I am getting a null pointer exception at vRL.addView(vET);

• what is it that I am doing wrong? -OR-
• Am I not adding the TextView element properly?

Answer 1

setContentView(R.layout.rLayout);

put this line in onCreate() of Activity..

and this line from method()

RelativeLayout vRL = (RelativeLayout)findViewById(R.id.rLayout);