Question

I have a view with a TextView and a Custom View laid out in a RelativeLayout. I am inflating the xml and I see both the TextView and CustomView rendered. Now I want to modify the text in the TextView depending on the actions of the user. How can I access the TextView from the view? I thought the following will work but I got a null –

mDisplay = (TextView)this.findViewById(R.id.displayBuffer);

The above works from inside the Activity but I really want to access it and modify it from the View.

EDIT: I did not post code because it might distract from the question. I am thinking accessing/modifying the TextView from inside a View should be a generic problem and nothing to do with my layout in specific. Having said that here is the layout —

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">


            <TextView
                android:id="@+id/question"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:textSize="30sp"
                android:text="ASDFASDF"
                android:textColor="#ffFFFFFF"   
                android:layout_gravity="center_vertical"
                android:paddingBottom="9dip"
                android:layout_marginLeft="3dip"
                android:layout_marginRight="2dip"/>

           <com.ac.gui.CustomView

            android:layout_below="@+id/question"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" />

</RelativeLayout>

Thanks,
– P

Answer 1

Assuming the two Views are in the same layout hierarchy:

mDisplay = (TextView) this.getRootView().findViewById(R.id.displayBuffer);

If you look at the docs, findViewById searches its child views, so you should go up the hierarchy before searching.