<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Please input:"
  />
<AutoCompleteTextView
  android:id="@+id/actv"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
/>
</LinearLayout>

package com.android.test;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
public class AutoCompleteTextViewDemo extends Activity {
  private AutoCompleteTextView actv;
  private static final String[] autoStrs = new String[]{"a","abc","abcd","abcde","ba"};
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //通過findViewById()方法取到actv
    actv = (AutoCompleteTextView)findViewById(R.id.actv);
    //new ArrayAdapter對象并將autoStr字符串?dāng)?shù)組傳入actv中
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_dropdown_item_1line,autoStrs);
    actv.setAdapter(adapter);
  }
}