“ArrayAdapter requires the resource ID to be a TextView” issue

Question

I seem to have problems using custom styles for ListView.

All online searches (stackOverflow and other sites) pty much say the same: - create an my_style.xml layout file. - use it in the adapter.

But for some reason this doesn't seem to be working for me. MainAct.java:

arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.list_content, items);

XML file:

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textview"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:textColor="#0000DD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />

saved as /res/layout/list_content.xml.

If I use the android.R.layout.simple_list_item_1 everything works fine, with the own xml file I get "java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView".

Any ideas?

PS: I already looked at lots of other very similar questions/issues, including:

"ArrayAdapter requires the resource ID to be a TextView" xml problems

How to set the text at center in ListView android application?

Android ListView Text Color

Answer 1

As error java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView clearly says. You need to pass the textview on which you need to show the data. Also, when you are using your own layout then R.java should belong to your project not android.R.

Change

arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.list_content, items);

to

arrayAdapter = new ArrayAdapter<String>(this, R.layout.list_content, R.id.textview, items);