Q: ArrayAdapter requires the resource ID to be a TextView-优快云博客

本文详细解释了ArrayAdapter在Android开发中遇到的资源ID必须为TextView的XML异常，提供了两种解决方案：一种是使用包含仅一个TextView的布局文件作为资源ID，另一种是提供包含多种视图但必须包含指定TextView的布局文件。并提供了相关链接进行深入学习。

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

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.youkuaiyun.com/xxg3053/article/details/6999872

http://stackoverflow.com/questions/9280965/arrayadapter-requires-the-resource-id-to-be-a-textview-xml-problems