Android之广播监控wifi连接状态

package com.example.floatdialogtest;  
  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
import android.net.NetworkInfo;  
import android.net.wifi.WifiInfo;  
import android.net.wifi.WifiManager;  
  
public class WifiReceiver extends BroadcastReceiver{  
    @Override  
    public void onReceive(Context context, Intent intent) {  
        // TODO Auto-generated method stub  
        if(intent.getAction().equals(WifiManager.RSSI_CHANGED_ACTION)){  
            //signal strength changed  
        }  
        else if(intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)){//wifi连接上与否  
            System.out.println("网络状态改变");  
            NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);  
            if(info.getState().equals(NetworkInfo.State.DISCONNECTED)){  
                System.out.println("wifi网络连接断开");  
            }  
            else if(info.getState().equals(NetworkInfo.State.CONNECTED)){  
                  
                WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);  
                WifiInfo wifiInfo = wifiManager.getConnectionInfo();                  
                  
                //获取当前wifi名称  
                System.out.println("连接到网络 " + wifiInfo.getSSID());  
                  
            }  
              
        }  
        else if(intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)){//wifi打开与否  
            int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);  
              
            if(wifistate == WifiManager.WIFI_STATE_DISABLED){  
                System.out.println("系统关闭wifi");  
            }  
            else if(wifistate == WifiManager.WIFI_STATE_ENABLED){  
                System.out.println("系统开启wifi");  
            }  
        }  
    }  
} 

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

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

\

receiver intetfilter

<intent-filter >
<action android:name="android.net.wifi.RSSI_CHANGED"/>
<action android:name="android.net.wifi.STATE_CHANGE"/>
<action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
</intent-filter>