Question

I want to insert a TextView into a LinearLayout that’s in a different XML file that is being used as layout for a ListView. But it seems that I can’t access the LinearLayout that’s in the other XML file.

I run a loop that gets category titles, and for each title I wanna create a TextView with the title.

How I insert the TextView

LinearLayout Layout = (LinearLayout) findViewById(R.id.itemDesign); //When debugging I can see "Layout" is just null. itemDesign is also not in main.xml.
TextView title = new TextView(this);
title.setText(CatName);
Layout.addView(title);

XML used by ListView “single_list_item.xml”

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/itemDesign"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <!-- Name Label -->
    <TextView android:id="@+id/name_label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="25dip"
        android:textStyle="bold"
        android:paddingTop="10dip"
        android:paddingBottom="10dip"
        android:textColor="#43bd00"/>
    <!-- Description Label -->
    <TextView android:id="@+id/email_label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#acacac"/>
</LinearLayout>

Answer 1

It sounds like you need to inflate your view. In getView() of adapter class

LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.your_layout, parent, false);

Then to access your TextViews

TextView firstTV = (TextView) rowView.findViewById(R.id.some_id);

All about LayoutInflater