Android Programmatically setting button text

Question

Does anybody know how to programmatically set the text of a button?

thing is i'm not calling this from the main layout(setContentView) i'm calling it in a view thats inflated after an asynctask heres what i have tried but this is giving a null pointer exception on the 2nd line

Button mButton=(Button)findViewById(R.id.contact);
        mButton.setText("number");

heres my layout where i am calling the button

   <Button
       android:id="@+id/contact"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_below="@+id/address"
       android:layout_toLeftOf="@+id/badge"
       android:background="@drawable/ic_btn_call"
       android:textSize="10dp"
       android:textStyle="bold"
       android:textColor="@color/white"/>

here my view i'm inflating

ClubInfo = LayoutInflater.from(getBaseContext()).inflate(R.layout.clubinfocell,
                null);

        TextView TeamNameText = (TextView) ClubInfo.findViewById(R.id.TeamName);
        TeamNameText.setText(teamName);

        TextView AddressText = (TextView) ClubInfo.findViewById(R.id.address);
        AddressText.setText(address1);



        Button mButton=(Button)ClubInfo.findViewById(R.id.contact);
        mButton.setText(telephone);

Answer 1

check R.java files import statement

are you sure that you have import it of the project you use .. and just format your layout (.xml ) file save it and again type the same statement

Answer 2

Then use your view's object to initialize it:

Button mButton = (Button)your_view_object.findViewById(R.id.contact);
mButton.setText("number");

When you try to identify a view other than your Activity's layout, you have to pass the reference of that view like this. If not Android will keep looking for this element from the layout which you provided in the setContentView().

For example, consider you have inflated a view like this:

View View = mInflater.inflate(R.layout.gridelement, null);

Then use this View's object for the Button present in that inflated layout:

  Button mButton = (Button)View.findViewById(R.id.contact);

Answer 3

your mButton is null.so NPE.are you refrenced xml resources after setContentView

onCreate(){
...
setContentView(R.layout.yourlayout);

Button mButton=(Button)findViewById(R.id.contact);
mButton.setText("number");

}

Answer 4

change your code as:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);//set layout here in which u have add contact in xml
        Button mButton=(Button)findViewById(R.id.contact);
        mButton.setText("number");

EDIT: Your \res\layout\main.xml look like as:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
<Button
       android:id="@+id/contact"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_below="@+id/address"
       android:layout_toLeftOf="@+id/badge"
       android:background="@drawable/ic_btn_call"
       android:textSize="10dp"
       android:textStyle="bold"
       android:textColor="@color/white"/>
</LinearLayout>