package com.app.myweb;import java.util.List;import android.app.Activity;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;public class WifiTest extends Activity{private WifiManager wifiManager ;private Button button;private TextView textView1,textView2;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.wifi);button = (Button) findViewById(R.id.button1);textView1 = (TextView) findViewById(R.id.textView1);textView2 = (TextView) findViewById(R.id.textView2);wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);if (wifiManager.isWifiEnabled()) {//判断Wifi是否开启textView1.setText("WIFI开关：已启用");button.setText("关闭Wifi");} else {textView1.setText("WIFI开关：已关闭");button.setText("打开Wifi");}button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (button.getText().equals("关闭Wifi")) {wifiManager.setWifiEnabled(false);textView1.setText("WIFI开关：已关闭");button.setText("打开Wifi");} else if (button.getText().equals("打开Wifi")) {wifiManager.setWifiEnabled(true);textView1.setText("WIFI开关：已启用");button.setText("关闭Wifi");}}});StringBuilder sBuilder = new StringBuilder();if (wifiManager != null) {List<ScanResult> wifiResults = wifiManager.getScanResults();if (wifiResults != null && wifiResults.size() != 0) {for (int i = 0; i < wifiResults.size(); i++) {ScanResult wifi = wifiResults.get(i);System.out.println(wifi.BSSID);sBuilder.append("第"+i+"个可用Wifi：\n");sBuilder.append("Wifi名称："+wifi.BSSID + "\n");}} else {Toast.makeText(this, "请检查Wifi是否开启", Toast.LENGTH_LONG).show();sBuilder.append("没有可用Wifi，请检查Wifi是否开启！");}}textView2.setText(sBuilder);}
}

XML布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:padding="10dp" ><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content" ><TextViewandroid:id="@+id/textView1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:text="WIFI开关" /><Buttonandroid:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:text="开启Wifi" /></RelativeLayout><TextViewandroid:id="@+id/textView2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="可用Wifi列表" /></LinearLayout>