android之AutoCompleteTextView控件用法

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/container"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    tools:context="com.example.mar_2300_autocompletetextview.MainActivity"    tools:ignore="MergeRootFrame" ><AutoCompleteTextView android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:id="@+id/atv"/><TextView android:id="@+id/textView1"    android:layout_width="fill_parent"    android:layout_height="wrap_content"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">Mar_2300_AutoCompleteTextView</string>    <string name="hello_world">Hello world!</string>    <string name="action_settings">Settings</string>    <string-array name="test">        <item>Mercury</item>        <item>Mercury2</item>        <item>Venus</item>        <item>Earth</item>        <item>Mars</item>        <item>Jupiter</item>        <item>Saturn</item>        <item>Uranus</item>        <item>Neptune</item>    </string-array></resources>

package com.example.mar_2300_autocompletetextview;import android.support.v7.app.ActionBarActivity;import android.support.v7.app.ActionBar;import android.support.v4.app.Fragment;import android.text.Editable;import android.text.TextWatcher;import android.app.Activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.AutoCompleteTextView;import android.widget.TextView;import android.os.Build;public class MainActivity extends Activity implements TextWatcher {    private AutoCompleteTextView atv;    private TextView tv;    private ArrayAdapter<CharSequence> adapter;        @Override    public void afterTextChanged(Editable s) {        // TODO Auto-generated method stub            }    @Override    public void beforeTextChanged(CharSequence s, int start, int count,            int after) {        // TODO Auto-generated method stub    }    @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {        // TODO Auto-generated method stub        tv.setText(atv.getText());    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        atv = (AutoCompleteTextView) findViewById(R.id.atv);        tv = (TextView) findViewById(R.id.textView1);        adapter = ArrayAdapter.createFromResource(this, R.array.test,                android.R.layout.simple_dropdown_item_1line);        atv.setAdapter(adapter);        atv.addTextChangedListener(this);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

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