AutoCompleteTextView监听输入内容并显示

package com.example.listview_2;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;

public class MainActivity extends Activity  implements  TextWatcher {

	private AutoCompleteTextView autoComplete_city;
	private String[] city_district = new String[] { "阿巴嘎旗-内蒙古", "阿坝-四川",
			"阿坝-四川", "阿尔山-内蒙古", "阿合奇-新疆", "阿克-甘肃", "阿克苏-新疆", "阿克苏-新疆",
			"阿克陶-新疆", "阿拉尔-新疆", "阿拉善盟-内蒙古", "阿拉善右旗-内蒙古", "阿拉善左旗-内蒙古", "阿勒泰-新疆",
			"阿勒泰-新疆", "阿里-西藏", "阿鲁科尔沁旗-内蒙古", "阿荣旗-内蒙古", "阿图什-新疆", "阿瓦提-新疆",
			"鞍山-辽宁", "安达-黑龙江", "安多-西藏", "安福-江西", "安国-河北", "安化-湖南", "安吉-浙江",
			"安康-陕西", "安龙-贵州", "安陆-湖北", "安宁-云南", "安平-河北", "安庆-安徽", "安丘-山东",
			"安仁-湖南", "安塞-陕西", "安顺-贵州", "安图-吉林", "安溪-福建", "安县-四川", "安乡-湖南",
			"安新-河北", "安阳-河南", "安阳-河南", "安义-江西", "安远-江西", "安岳-四川", "安泽-山西",
		        "黟县-安徽",

	};

	private Button button1;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		autoComplete_city = (AutoCompleteTextView) findViewById(R.id.autoComplete_city);
		button1 = (Button) findViewById(R.id.button1);

		ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, city_district);
		autoComplete_city.setAdapter(adapter);
		Log.i("info", "info");

		//String city = autoComplete_city.getText().toString();
		
		//String city=autoComplete_city.getAdapter().ge
		
		//Log.i("city", city);
		Log.i("info2", "info2");
		autoComplete_city.addTextChangedListener(this);
		
		//button1.setText(city);
		button1.setOnLongClickListener(new OnLongClickListener() {

			@Override
			public boolean onLongClick(View v) {
				// TODO Auto-generated method stub
				button1.setVisibility(View.GONE);
				return true;
			}
		});

	}////onCreate

	@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
		
	}

	@Override
	public void afterTextChanged(Editable s) {
		// TODO Auto-generated method stub
		
		button1.setText(autoComplete_city.getText());
		
	}
}///MainActivity