1 package zzl.wifi;
 2
 3 import android.app.Activity;
 4 import android.content.Context;
 5 import android.net.wifi.WifiManager;
 6 import android.os.Bundle;
 7 import android.view.Menu;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 import android.widget.Toast;
12
13 public class WifiActivity extends Activity {
14
15     private Button start=null;
16     private Button stop=null;
17     private Button check=null;
18     private WifiManager wifiManager=null;
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.main);
23
24         start=(Button)findViewById(R.id.start);
25         stop=(Button)findViewById(R.id.stop);
26         check=(Button)findViewById(R.id.check);
27
28         start.setOnClickListener(new StartWifiListener());
29         stop.setOnClickListener(new StopWifiListener());
30         check.setOnClickListener(new CheckWifiListener());
31     }
32
33     class StartWifiListener implements OnClickListener{
34
35         @Override
36         public void onClick(View v) {
37             // TODO Auto-generated method stub
38             //WifiActivity继承自Activity，
39             //Activity本身又是Context的子类（所以Context的所有函数Activity都可以用）
40             wifiManager=(WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
41             wifiManager.setWifiEnabled(true);
42             System.out.println("wiif state--->"+wifiManager.getWifiState());
43             Toast.makeText(WifiActivity.this, "当前wifi状态："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
44         }
45     }
46     class StopWifiListener implements OnClickListener{
47
48         @Override
49         public void onClick(View v) {
50             // TODO Auto-generated method stub
51              wifiManager=(WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
52                 wifiManager.setWifiEnabled(false);
53                 System.out.println("wiif state--->"+wifiManager.getWifiState());
54                 Toast.makeText(WifiActivity.this, "当前wifi状态："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
55         }
56     }
57     class CheckWifiListener implements OnClickListener{
58
59         @Override
60         public void onClick(View v) {
61             // TODO Auto-generated method stub
62              wifiManager=(WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
63              System.out.println("wiif state--->"+wifiManager.getWifiState());
64              Toast.makeText(WifiActivity.this, "当前wifi状态："+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
65         }
66     }
67     @Override
68     public boolean onCreateOptionsMenu(Menu menu) {
69         // Inflate the menu; this adds items to the action bar if it is present.
70         getMenuInflater().inflate(R.menu.main, menu);
71         return true;
72     }
73
74 }

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:orientation="vertical"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     tools:context=".WifiActivity" >
 7
 8     <Button
 9         android:layout_width="fill_parent"
10         android:layout_height="wrap_content"
11         android:id="@+id/start"
12         android:text="@string/start"/>
13     <Button
14         android:layout_width="fill_parent"
15         android:layout_height="wrap_content"
16         android:id="@+id/stop"
17         android:text="@string/stop"/>
18     <Button
19         android:layout_width="fill_parent"
20         android:layout_height="wrap_content"
21         android:id="@+id/check"
22         android:text="@string/check"/>
23
24 </LinearLayout>

1      <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"></uses-permission>
2      <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
3      <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
4      <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>