android—wifi | 易学教程

1. 什么是wifi？

Wifi是一种无线联网的技术，以前通过网线连接电脑，现在通过无线电波来连网，常见的就是一个无限路由器，那么这个无限路由器的电波覆盖的有效范围都可以采用wifi连接方式进行连网，如果无线路由器连接了一条ADSL线路或者别的上网线路，则又被称为热点。

2. 获取wifi网卡的状态

是由一系列的整形常量来表示的，

WIFI_STATE_DISABLED: 网卡不可用 constant value 1

WIFI_STATE_DISABLING：WIFI正在关闭 constant value 0

WIFI_STATE_ENABLED: WIFI网卡可用 constant value 3

WIFI_STATE_ENABLING : WIFI网卡正在打开 constant value 2

WIFI_STATE_UNKNOWN:未知网卡状态

3. 操作wifi所需要的权限

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

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

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

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

4. 改变wifi网卡的状态

改变wifi网卡的状态，

对wifi网卡进行操作，需要通过WifiManager对象来进行，获取该对象的方法如下:

WifiManger

WifiManger =( WifiManger)Context.getSystemService(Service.WIFI_SERVICE);

打开wifi网卡

WifiManger.setWifiEnabled(ture);

关闭wifi网卡

WifiManger.setEnable(false);

获取网卡当前的状态：

WifiManger.getWifiState();

代码如下：

View Code

 1 package com.wbk.wifi.activity; 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 Wifi_wbkActivity extends Activity13 {14     private Button startButton = null;15     private Button stopButton = null;16     private Button checkButton = null;17 18     private WifiManager wifiManager = null;19 20     @Override21     public void onCreate(Bundle savedInstanceState)22     {23         super.onCreate(savedInstanceState);24         setContentView(R.layout.main);25         startButton = (Button) findViewById(R.id.startButton);26         stopButton = (Button) findViewById(R.id.stopButton);27         checkButton = (Button) findViewById(R.id.checkButton);28         startButton.setOnClickListener(new startWifiListener());29         stopButton.setOnClickListener(new stopWifiListener());30         checkButton.setOnClickListener(new checkWifiListener());31     }32 33     // 内部类，需要的是Wifi_wbkActivity的对象，所以Wifi_wbkActivity.this34     class startWifiListener implements OnClickListener35     {36 37         @Override38         public void onClick(View v)39         {40             wifiManager = (WifiManager) Wifi_wbkActivity.this.getSystemService(Context.WIFI_SERVICE);41             wifiManager.setWifiEnabled(true);42             System.out.println("wifi start ----->" + wifiManager.getWifiState());43             Toast.makeText(Wifi_wbkActivity.this, "当前wifi网卡状态为", wifiManager.getWifiState());44         }45     }46 47     class stopWifiListener implements OnClickListener48     {49 50         @Override51         public void onClick(View v)52         {53             wifiManager=(WifiManager)Wifi_wbkActivity.this.getSystemService(Context.WIFI_SERVICE);54             wifiManager.setWifiEnabled(false);55             System.out.println("wifi stop --->"+wifiManager.getWifiState());56             Toast.makeText(Wifi_wbkActivity.this, "当前的wifi状态为", wifiManager.getWifiState());57             58         }59 60     }61     class checkWifiListener implements OnClickListener{62 63         @Override64         public void onClick(View v)65         {66             wifiManager=(WifiManager)Wifi_wbkActivity.this.getSystemService(Context.WIFI_SERVICE);67             System.out.println("wifi state ----->"+wifiManager.getWifiState());68             Toast.makeText(Wifi_wbkActivity.this, "当前的wifi状态为",  wifiManager.getWifiState());69         }70         71     }72 73 }

来源：https://www.cnblogs.com/bokun-wang/archive/2011/10/06/2200056.html

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