Android管理Wifi

首先，需要权限

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

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

WIF的状态在WifiManager中定义了常量，都是public static final int类型的，如下

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1. public static final int WIFI_STATE_DISABLED  
2. Wi-Fi is disabled.  
3. Constant Value: 1 (0x00000001)  
4.   
5.   
6. public static final int WIFI_STATE_DISABLING  
7. Wi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.  
8. Constant Value: 0 (0x00000000)  
9.   
10.   
11. public static final int WIFI_STATE_ENABLED  
12. Wi-Fi is enabled.  
13. Constant Value: 3 (0x00000003)  
14.   
15.   
16.   
17.   
18. public static final int WIFI_STATE_ENABLING  
19. Wi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.  
20. Constant Value: 2 (0x00000002)  
21.   
22.   
23.   
24. public static final int WIFI_STATE_UNKNOWN  
25. Wi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.  
26. Constant Value: 4 (0x00000004)  

public static final int WIFI_STATE_DISABLEDWi-Fi is disabled.Constant Value: 1 (0x00000001)public static final int WIFI_STATE_DISABLINGWi-Fi is currently being disabled. The state will change to WIFI_STATE_DISABLED if it finishes successfully.Constant Value: 0 (0x00000000)public static final int WIFI_STATE_ENABLEDWi-Fi is enabled.Constant Value: 3 (0x00000003)public static final int WIFI_STATE_ENABLINGWi-Fi is currently being enabled. The state will change to WIFI_STATE_ENABLED if it finishes successfully.Constant Value: 2 (0x00000002)public static final int WIFI_STATE_UNKNOWNWi-Fi is in an unknown state. This state will occur when an error happens while enabling or disabling.Constant Value: 4 (0x00000004)

定义一个并且初始化WifiManager manager==(WifiManager) Context.getSystemService(Context.WIFI_SERVICE);

启动WIFI manager.setWifiEnabled(true);

关闭WIFI manager.setWifiEnabled(false);

获取WIFI状态 manager.getWifiState();返回前面说的五种状态的一种

下面是全部代码

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1. package com.zhycheng.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.View;  
8. import android.view.View.OnClickListener;  
9. import android.widget.Button;  
10. import android.widget.Toast;  
11.   
12. public class WIFIDemoActivity extends Activity implements OnClickListener {  
13.     Button start,stop,state;  
14.     WifiManager manager;  
15.       
16.       
17.     public void onCreate(Bundle savedInstanceState) {  
18.         super.onCreate(savedInstanceState);  
19.         setContentView(R.layout.main);  
20.         start=(Button) findViewById(R.id.startWIFI);  
21.         stop=(Button) findViewById(R.id.stopWIFI);  
22.         state=(Button) findViewById(R.id.getSTATE);  
23.         start.setOnClickListener(this);  
24.         stop.setOnClickListener(this);  
25.         state.setOnClickListener(this);  
26.     }  
27.   
28.   
29.   
30.     @Override  
31.     public void onClick(View v) {  
32.         manager=(WifiManager) this.getSystemService(Context.WIFI_SERVICE);  
33.           
34.         switch(v.getId())  
35.         {  
36.         case R.id.startWIFI:  
37.             manager.setWifiEnabled(true);  
38.             System.out.println("当前WIFI状态为"+manager.getWifiState());  
39.             Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();  
40.               
41.             break;  
42.         case R.id.stopWIFI:  
43.             manager.setWifiEnabled(false);  
44.             System.out.println("当前WIFI状态为"+manager.getWifiState());  
45.             Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();  
46.               
47.             break;  
48.         case R.id.getSTATE:  
49.               
50.             System.out.println("当前WIFI状态为"+manager.getWifiState());  
51.             Toast.makeText(this, "当前WIFI状态为"+manager.getWifiState(), Toast.LENGTH_SHORT).show();  
52.             break;  
53.         }  
54.           
55.     }  
56. }