Android TextWatcher(auto-complete-text-view) example

We often require a ListView with search option. Here is an example of a ListView with a TextEdit on top. The target of this program is to update the list items as user types into the TextEdit box.

Layout XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/item_top_wrapper" android:background="#991A1111"
       android:paddingLeft="2dip" android:paddingRight="2dip"
       android:layout_height="wrap_content"
       android:layout_width="fill_parent"
       android:focusable="true"
       android:focusableInTouchMode="true">
        <EditText android:id="@+id/search_string"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dip"
                android:hint="Search Key"
                android:singleLine="true" />          
    </LinearLayout>
    
    <ListView
        android:id="@+id/itemList"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/item_top_wrapper"
        android:background="#55E0FFFF"
        android:cacheColorHint="#00000000"/>
        
 </RelativeLayout>

Activity Code:

ListView itemListView = (ListView)findViewById(R.id.itemList);
TextView textView = (TextView)findViewById(R.id.search_string);
ArrayAdapter<String> autoCompleteAdapter = 
    new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line); 
// This is so I don't have to manually sync whenever changed 
autoCompleteAdapter.setNotifyOnChange(true); 
        
itemListView.setAdapter(autoCompleteAdapter);
               
final TextWatcher textChecker = new TextWatcher() {
             
        public void afterTextChanged(Editable s) {
               textView.setEnabled(true);
        }

        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
               textView.setEnabled(false);
        }
     
        public void onTextChanged(CharSequence s, int start, int before, int count) {
               autoCompleteAdapter.clear();
               for (int i=1; i < nameArr.length; i++) {
                   if(nameArr[i].contains(s.toString()))
                       autoCompleteAdapter.add((String) nameArr[i]);
               }
           }
};
textView.addTextChangedListener(textChecker);