AutoCompleteTextView控件的使用

public class MainActivity extends Activity {

    //[0]声明AutoCompleteTextView要显示的数据
      private static final String[] COUNTRIES = new String[] {
             "laofang", "laozhang", "laoli", "laobi","laoli","laowang","aab","abb","cc"
         };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //[1]找到控件
        AutoCompleteTextView actv = (AutoCompleteTextView) findViewById(R.id.actv);

        //[2]创建数据适配器
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line, COUNTRIES);

        //[3]设置数据适配器
        actv.setAdapter(adapter);
    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <AutoCompleteTextView
        android:id="@+id/actv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:completionThreshold="1"
         />

</RelativeLayout>