android脚步---自动完成文本框

自动完成文本框AutoCompleteTextView，当用户输入一定字符时，自动完成文本框会显示一个下拉菜单，供用户选择，设置一个Adapter，该Adapter中封装了AutoCompleteTextView预设的文本

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>

<AutoCompleteTextView
android:id="@+id/auto"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:completionHint="请选择您喜欢的图书"
android:dropDownHorizontalOffset="20dp"
android:completionThreshold="1"
/>

</LinearLayout>

mainactivity

package com.example.autocompletetextview;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends Activity {
//定义字符串数组，作为提示文本
String[]  books = new String[]{
"aaa",
"abbb",
"accc",
"addd",
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//创建一个ArrayAdapter,封装数组
ArrayAdapter<String> aa = new ArrayAdapter<String>(
this,
android.R.layout.simple_dropdown_item_1line,
books);
AutoCompleteTextView actv = (AutoCompleteTextView)
findViewById(R.id.auto);
//设置adapter
actv.setAdapter(aa);
}
}