自动补全提示最主要的是使用AutoCompleteTextView控件，继而从与控件关联的ArrayAdapter提供的字符串集合得到提示。

先上图


AutoCompleteTextViewActivity.java代码如下：

publicclassAutoCompleteTextViewActivityextendsActivity{@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.autocomplete);setTitle("AutoCompleteTextView_Activity");ArrayAdapter<String>adapter=newArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,COUNTRIES);//第2个参数是每个item的显示样式，第3个参数为提供数据的数组名AutoCompleteTextViewautotextView=(AutoCompleteTextView)findViewById(R.id.auto_complete);autotextView.setAdapter(adapter);//将adapter适配器添加到auto..对象中autotextView.setThreshold(1);//设置输入几个字母开始关联，默认是2(threshole:入口，门槛，临界值)}staticfinalString[]COUNTRIES=newString[]{//设置数据源"China","Russia","Germany","Ukraine","Belarus","USA","China1","China12","Germany1","Russia2","Belarus1","USA1"};}

layout中XML文件如下：

<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="wrap_content"><AutoCompleteTextViewandroid:id="@+id/auto_complete"android:layout_width="fill_parent"android:layout_height="wrap_content"/></LinearLayout>

当然，为了以后修改数据源及代码的方便，建议将数据添加到在layout下的strings.xml文件中去

<?xmlversion="1.0"encoding="utf-8"?><resources><string-arrayname="countries_array"><item>China</item><item>China1</item><item>China12</item></string-array></resources>

再将原先的数据源修改为如下即可

String[]COUNTRIES=getResources().getStringArray(R.array.countries_array);

注意：这条语句应写在new ArrayAdapter语句之前