android之WIFI网络操作笔记

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本文介绍了如何在Android应用中管理WiFi连接，包括请求必要的权限、使用WifiManager类操作WiFi状态及扫描周边网络等。提供了完整的示例代码。

1.先确认操作WIFI所需要的权限,需要修改AndroidManifest.xml

在SDK文档中的docs\reference 搜索 Manifest.permission 里面查看关于wifi的权限

String ACCESS_WIFI_STATE Allows applications to access information about Wi-Fi networks

String CHANGE_WIFI_MULTICAST_STATE Allows applications to enter Wi-Fi Multicast mode
String CHANGE_WIFI_STATE Allows applications to change Wi-Fi connectivity state
String ACCESS_NETWORK_STATE Allows applications to access information about networks

添加如下

  <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>

2.确认WIFIManager类的相关介绍和WIFI的状态值

在SDK文档中的docs\reference 搜索WifiManager，可以看到状态值

int WIFI_STATE_DISABLED Wi-Fi is disabled.
int WIFI_STATE_DISABLING Wi-Fi is currently being disabled.
int WIFI_STATE_ENABLED Wi-Fi is enabled.
int WIFI_STATE_ENABLING Wi-Fi is currently being enabled.
int WIFI_STATE_UNKNOWN Wi-Fi is in an unknown state.

3.WifiManager对象操作

WifiManager wifiManager =(WifiManager)Context.getSystemService(Service_WIFI_SERVICE);

打开WIFI网卡 wifiManager.setWifiEnable(true);

关闭WIFI网卡 wifiManager.setWifiEnable(false);

获取状态 wifiManager.getWifiState();

4.具体代码如下：

package x2p2.wifi;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class ActivityMain extends Activity {
    /** Called when the activity is first created. */
private Button startButton=null;
private Button endButton=null;
private Button checkButton=null;
private WifiManager wifiManager=null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startButton =(Button)findViewById(R.id.startWifi);
        endButton =(Button)findViewById(R.id.stopWifi);
        checkButton=(Button)findViewById(R.id.checkwifi);
        startButton.setOnClickListener(new StartWifiListener());
        endButton.setOnClickListener(new EndWifiListener());
        checkButton.setOnClickListener(new CheckWifiListener());
    }
    
    class StartWifiListener implements OnClickListener{

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   wifiManager=(WifiManager)ActivityMain.this.getSystemService(Context.WIFI_SERVICE);
   wifiManager.setWifiEnabled(true);
   System.out.println("wifi state-->"+wifiManager.getWifiState());
   Toast.makeText(ActivityMain.this, "当前wifi网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
  }
     
    }
    
    class EndWifiListener implements OnClickListener{

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   wifiManager=(WifiManager)ActivityMain.this.getSystemService(Context.WIFI_SERVICE);
   wifiManager.setWifiEnabled(false);
   System.out.println("wifi state-->"+wifiManager.getWifiState());
   Toast.makeText(ActivityMain.this, "当前wifi网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
  }
     
    }
    
    class CheckWifiListener implements OnClickListener{

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   wifiManager=(WifiManager)ActivityMain.this.getSystemService(Context.WIFI_SERVICE);
   //wifiManager.setWifiEnabled(false);
   System.out.println("wifi state-->"+wifiManager.getWifiState());
   Toast.makeText(ActivityMain.this, "当前wifi网卡状态为"+wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
  }
     
    }
}

5：WiFi一些常见操作

package com.yarin.android.Examples_08_08;

import java.util.List;

import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;

public class WifiAdmin
{
	//定义WifiManager对象
	private WifiManager mWifiManager;
	//定义WifiInfo对象
	private WifiInfo mWifiInfo;
	//扫描出的网络连接列表
	private List<ScanResult> mWifiList;
	//网络连接列表
	private List<WifiConfiguration> mWifiConfiguration;
	//定义一个WifiLock
	WifiLock mWifiLock;
	//构造器
	public  WifiAdmin(Context context)
	{
		//取得WifiManager对象
		mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
		//取得WifiInfo对象
		mWifiInfo = mWifiManager.getConnectionInfo();
	}
	//打开WIFI
	public void OpenWifi()
	{
		if (!mWifiManager.isWifiEnabled())
		{
			mWifiManager.setWifiEnabled(true);
			
		}
	}
	//关闭WIFI
	public void CloseWifi()
	{
		if (!mWifiManager.isWifiEnabled())
		{
			mWifiManager.setWifiEnabled(false);	
		}
	}
	//锁定WifiLock
	public void AcquireWifiLock()
	{
		mWifiLock.acquire();
	}
	//解锁WifiLock
	public void ReleaseWifiLock()
	{
		//判断时候锁定
		if (mWifiLock.isHeld())
		{
			mWifiLock.acquire();
		}
	}
	//创建一个WifiLock
	public void CreatWifiLock()
	{
		mWifiLock = mWifiManager.createWifiLock("Test");
	}
	//得到配置好的网络
	public List<WifiConfiguration> GetConfiguration()
	{
		return mWifiConfiguration;
	}
	//指定配置好的网络进行连接
	public void ConnectConfiguration(int index)
	{
		//索引大于配置好的网络索引返回
		if(index > mWifiConfiguration.size())
		{
			return;
		}
		//连接配置好的指定ID的网络
		mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true);
	}
	public void StartScan()
	{
		mWifiManager.startScan();
		//得到扫描结果
		mWifiList = mWifiManager.getScanResults();
		//得到配置好的网络连接
		mWifiConfiguration = mWifiManager.getConfiguredNetworks();
	}
	//得到网络列表
	public List<ScanResult> GetWifiList()
	{
		return mWifiList;
	}
	//查看扫描结果
	public StringBuilder LookUpScan()
	{
		StringBuilder stringBuilder = new StringBuilder();
		for (int i = 0; i < mWifiList.size(); i++)
		{
			stringBuilder.append("Index_"+new Integer(i + 1).toString() + ":");
			//将ScanResult信息转换成一个字符串包
			//其中把包括：BSSID、SSID、capabilities、frequency、level
			stringBuilder.append((mWifiList.get(i)).toString());
			stringBuilder.append("\n");
		}
		return stringBuilder;
	}
	//得到MAC地址
	public String GetMacAddress()
	{
		return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();
	}
	//得到接入点的BSSID
	public String GetBSSID()
	{
		return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
	}
	//得到IP地址
	public int GetIPAddress()
	{
		return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
	}
	//得到连接的ID
	public int GetNetworkId()
	{
		return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();
	}
	//得到WifiInfo的所有信息包
	public String GetWifiInfo()
	{
		return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();
	}
	//添加一个网络并连接
	public void AddNetwork(WifiConfiguration wcg)
	{
		int wcgID = mWifiManager.addNetwork(wcg); 
		mWifiManager.enableNetwork(wcgID, true); 
	}
	//断开指定ID的网络
	public void DisconnectWifi(int netId)
	{
		mWifiManager.disableNetwork(netId);
		mWifiManager.disconnect();
	}
}