android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 
 

receiver intetfilter