Q: ArrayAdapter requires the resource ID to be a TextView

Q:

Error Msg: ArrayAdapter requires the resource ID to be a TextView

A:

The ArrayAdapter requires the resource ID to be a TextView XML exception means you don't supply what the

ArrayAdapter

expects.
When you use this constructor:

new ArrayAdapter<String>(this, R.layout.a_layout_file, this.file)

R.Layout.a_layout_file

must
be the id of a xml layout file containing only a

TextView

(the

TextView

can't be
wrapped by another layout, like a

LinearLayout

,

RelativeLayout

etc!),
something like this:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
// other attributes of the TextView
/>

If you want your list row layout to be something a little different then a simple

TextView

widget
use this constructor:

new ArrayAdapter<String>(this, R.layout.a_layout_file,
R.id.the_id_of_a_textview_from_the_layout, this.file)

where you supply the

id

of
a layout that can contain various views, but also must contain a

TextView

with
and

id

(the
third parameter) that you pass to your

ArrayAdapter

so
it can know where to put the

Strings

in
the row layout.

Refer:
http://blog.csdn.net/xxg3053/article/details/6999872 http://stackoverflow.com/questions/9280965/arrayadapter-requires-the-resource-id-to-be-a-textview-xml-problems