Android判断联网状态，Wifi信号强度，注册网络变化广播事件

code

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package com.idogfooding.lawsonsot.common;   import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager;   import com.idogfooding.lawsonsot.model.WifiResultInfo; /**  *  * */ public class WiFiUtil {     /**      * 判断是否联网      */     public static boolean checkConnectNetwork(Context context) {         ConnectivityManager conn = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);         NetworkInfo net = conn.getActiveNetworkInfo();         if (net != null && net.isConnected()) {             return true;         }         return false;     }       /**      * 获取已连接的wifi      */     public static WifiResultInfo getConnectedWifi(Context context) { //        Context context = SysApplication.getContext();         WifiResultInfo wifiResultInfo = null;         WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);         WifiInfo wifiInfo = wifiManager.getConnectionInfo();           if (wifiInfo != null) {             wifiResultInfo = new WifiResultInfo();             //名称             String ssid = wifiInfo.getSSID();             //信号强度，得到的值是一个0到-100的区间值，是一个int型数据             int rssi = wifiInfo.getRssi();               if(ssid.startsWith("\"") && ssid.endsWith("\""))             {                 ssid = ssid.substring(1, ssid.length() - 1);             }             //信号强度等级，根据强度值，分为6个等级，5最大，表示强度最高，0表示没连Wifi。             int level = WifiManager.calculateSignalLevel(rssi, 6);             String supplicantState = wifiInfo.getSupplicantState().toString();               wifiResultInfo.setWifiLevel(level);             wifiResultInfo.setRssi(rssi);             wifiResultInfo.setSsid(ssid);             wifiResultInfo.setSupplicantState(supplicantState);         }         return wifiResultInfo;     } }

 AndroidManifest.xml

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<!-- 联网，网络状态 -->     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- WIFI改变，WIFI状态 -->     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <!-- 申请定位权限 否则的话，wifiManager.getScanResults()获取不到任何的数据 -->     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

注册网络变化接收通知

/**
     * 注册网络变化接收通知
     * */
    public static void regNetChageRecever(Context context){
        NetChangeReceiver receiver = new NetChangeReceiver();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        context.registerReceiver(receiver, intentFilter);
    }

Recever

package com.jay.common;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * 接收 网络状态变化 发出的通知
 * */
public class NetChangeReceiver extends BroadcastReceiver {

    @SuppressLint("UnsafeProtectedBroadcastReceiver")
    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            if (networkInfo != null && networkInfo.isConnected()) {
                //有网
                String res = "";
                Activity activity = BaseForm.curActivity();
                activity.runOnUiThread(()->{
//                    activity.findViewById(R.id.txtDes);
                });
            } else {
                //无网
            }
        } catch (Exception e) {
            //ignore
        }
    }
}

来源：https://blog.csdn.net/chongchi_wxcc/article/details/126941037