如何检测Android中何时建立WIFI连接？

问题描述 投票：129回答：13

我需要检测何时通过WIFI进行网络连接。发送什么广播以确定已建立有效的网络连接。我需要验证HTTP的有效网络连接是否存在。我应该注意什么以及我需要做些什么其他测试才能知道存在有效连接。

android android-wifi
13个回答
119
投票

您可以注册一个BroadcastReceiver，以便在建立WiFi连接时（或连接更改时）收到通知。

注册BroadcastReceiver：

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
registerReceiver(broadcastReceiver, intentFilter);

然后在你的BroadcastReceiver做这样的事情：

@Override
public void onReceive(Context context, Intent intent) {
    final String action = intent.getAction();
    if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {
        if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)) {
            //do stuff
        } else {
            // wifi connection was lost
        }
    }
}

有关更多信息，请参阅BroadcastReceiver和WifiManager的文档

当然，在此之前您应该检查设备是否已连接到WiFi。

编辑：感谢ban-geoengineering，这是检查设备是否已连接的方法：

private boolean isConnectedViaWifi() {
     ConnectivityManager connectivityManager = (ConnectivityManager) appObj.getSystemService(Context.CONNECTIVITY_SERVICE);
     NetworkInfo mWifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);     
     return mWifi.isConnected();
}
2
投票

我用过这段代码：

public class MainActivity extends Activity
    {
    .
    .
    .
    @Override
    protected void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);
        .
        .
        .
        }

    @Override
    protected void onResume()
        {
        super.onResume();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
        registerReceiver(broadcastReceiver, intentFilter);  
        }

    @Override
    protected void onPause()
        {
        super.onPause();
        unregisterReceiver(broadcastReceiver);
        }

    private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver()
        {
        @Override
        public void onReceive(Context context, Intent intent)
            {
            final String action = intent.getAction();
            if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION))
                {
                if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false))
                    {
                    // wifi is enabled
                    }
                else
                    {
                    // wifi is disabled
                    }
                }
            }
        };
    }
2
投票

我有两种方法来检测接收应用程序上下文的WIFI连接：

1)my old method

public boolean isConnectedWifi1(Context context) {
    try {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();           
        if (networkInfo != null) {
            NetworkInfo[] netInfo = connectivityManager.getAllNetworkInfo();
            for (NetworkInfo ni : netInfo) {
                if ((ni.getTypeName().equalsIgnoreCase("WIFI"))
                        && ni.isConnected()) {
                    return true;
                }                   
            }
        }
        return false;
    } catch (Exception e) {
        Log.e(TAG, e.getMessage());
    }
    return false;
}

2)my New method (I´m currently using this method):

public boolean isConnectedWifi(Context context) {
         ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);     
         return networkInfo.isConnected();
}
2
投票

1）我尝试了广播接收器方法，尽管我知道CONNECTIVITY_ACTION/CONNECTIVITY_CHANGE在API 28中已弃用，不推荐使用。还绑定使用显式寄存器，只要app正在运行，它就会监听。

2）我也尝试过Firebase Dispatcher，它可以工作但不会超过app杀死。

3）找到的推荐方法是使用registerNetworkRequest()保证在进程被杀死和内部执行的WorkManager

支持＃3方法的最大证据是Android doc本身。特别是对于后台的应用程序。

还有here

在Android 7.0中，我们删除了三个常用的隐式广播 - CONNECTIVITY_ACTION，ACTION_NEW_PICTURE和ACTION_NEW_VIDEO - 因为它们可以同时唤醒多个应用程序的后台进程并消耗内存和电池。如果您的应用正在接收这些内容，请利用Android 7.0迁移到JobScheduler和相关API。

到目前为止，它适用于我们使用Periodic WorkManager请求。

更新：我最终写了两个关于它的系列medium post。

1
投票

对于所有享受CONNECTIVITY_CHANGE广播的人，请注意当应用程序在Android O中处于后台时，这不再被解雇。

https://developer.android.com/about/versions/o/background.html

104
投票

对我有用的最好的：

AndroidManifest

<receiver android:name="com.AEDesign.communication.WifiReceiver" >
   <intent-filter android:priority="100">
      <action android:name="android.net.wifi.STATE_CHANGE" />
   </intent-filter>
</receiver>

BroadcastReceiver class

public class WifiReceiver extends BroadcastReceiver {

   @Override
   public void onReceive(Context context, Intent intent) {

      NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
      if(info != null && info.isConnected()) {
        // Do your work. 

        // e.g. To check the Network Name or other info:
        WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        String ssid = wifiInfo.getSSID();
      }
   }
}

Permissions

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
16
投票

对我来说，只有WifiManager.NETWORK_STATE_CHANGED_ACTION工作。

注册广播接收器：

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
registerReceiver(broadcastReceiver, intentFilter);

并收到：

@Override
public void onReceive(Context context, Intent intent) {

    final String action = intent.getAction();

    if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)){
        NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
        boolean connected = info.isConnected();

        //call your method
    }      
}
10
投票

用户@JPM和@usman给出的答案非常有用。它工作正常，但在我的情况下，它在我的情况下多次进入onReceive 4次，所以我的代码执行多次。

我做了一些修改，按照我的要求制作，现在只有一次

这是广播的java类。

public class WifiReceiver extends BroadcastReceiver {

String TAG = getClass().getSimpleName();
private Context mContext;

@Override
public void onReceive(Context context, Intent intent) {

    mContext = context;


    if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();

        if (networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_WIFI &&
                networkInfo.isConnected()) {
            // Wifi is connected
            WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
            WifiInfo wifiInfo = wifiManager.getConnectionInfo();
            String ssid = wifiInfo.getSSID();

            Log.e(TAG, " -- Wifi connected --- " + " SSID " + ssid );

        }
    }
    else if (intent.getAction().equalsIgnoreCase(WifiManager.WIFI_STATE_CHANGED_ACTION))
    {
        int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN);
        if (wifiState == WifiManager.WIFI_STATE_DISABLED)
        {
            Log.e(TAG, " ----- Wifi  Disconnected ----- ");
        }

    }
}
}

在AndroidManifest中

<receiver android:name=".util.WifiReceiver" android:enabled="true">
        <intent-filter>
            <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
        </intent-filter>
    </receiver>


<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
8
投票

如果您允许用户选择覆盖每次询问的正常行为，则可以启动wifi连接。

我选择使用三种方法......

public boolean isOnline() 
{
 ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
 NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
 return (networkInfo != null && networkInfo.isConnected());
}

这是快速检查是否有互联网连接Wifi或CellData。从这里，您可以选择要采取的操作。是否在飞机模式下也需要进行检查。

在一个单独的线程上。我将变量IpAddress设置为=“”并进行轮询，直到我有一个有效的IP地址。

  WifiManager wifi;
  wifi = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
  WifiInfo wifiInfo = wifi.getConnectionInfo();
  int ipAddress = wifiInfo.getIpAddress();
  String ip = null;
  ip = String.format("%d.%d.%d.%d",
  (ipAddress & 0xff),
  (ipAddress >> 8 & 0xff),
  (ipAddress >> 16 & 0xff),
  (ipAddress >> 24 & 0xff));
  Log.e(" >>IP number Begin ",ip);

另一个代码片段...如果它没有打开（用户事先许可）

   if(wifi.isWifiEnabled()!=true)wifi.setWifiEnabled(true);
6
投票

为了检测WIFI连接状态，我使用了ConnectivityManager类的CONNECTIVITY_ACTION：

    IntentFilter filter=new IntentFilter();
    filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
    registerReceiver(receiver, filter);

并从您的BroadCastReceiver：

    if (ConnectivityManager.CONNECTIVITY_ACTION.equals(action)) {
        int networkType = intent.getIntExtra(
                android.net.ConnectivityManager.EXTRA_NETWORK_TYPE, -1);
        if (ConnectivityManager.TYPE_WIFI == networkType) {
            NetworkInfo networkInfo = (NetworkInfo) intent
                    .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            if (networkInfo != null) {
                if (networkInfo.isConnected()) {

                    // TODO: wifi is connected
                } else {
                    // TODO: wifi is not connected
                }
            }
        }

    }

ps：对我来说很好:)

5
投票

此代码根本不需要许可。它仅限于Wi-Fi网络连接状态更改（不考虑任何其他网络）。接收器静态发布在AndroidManifest.xml文件中，不需要导出，因为系统protected broadcast，NETWORK_STATE_CHANGED_ACTION将在每次网络连接状态更改时调用它。

AndroidManifest：

<receiver
    android:name=".WifiReceiver"
    android:enabled="true"
    android:exported="false">

    <intent-filter>
        <!--protected-broadcast: Special broadcast that only the system can send-->
        <!--Corresponds to: android.net.wifi.WifiManager.NETWORK_STATE_CHANGED_ACTION-->
        <action android:name="android.net.wifi.STATE_CHANGE" />
    </intent-filter>

</receiver>

BroadcastReceiver类：

public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
/*
 Tested (I didn't test with the WPS "Wi-Fi Protected Setup" standard):
 In API15 (ICE_CREAM_SANDWICH) this method is called when the new Wi-Fi network state is:
 DISCONNECTED, OBTAINING_IPADDR, CONNECTED or SCANNING

 In API19 (KITKAT) this method is called when the new Wi-Fi network state is:
 DISCONNECTED (twice), OBTAINING_IPADDR, VERIFYING_POOR_LINK, CAPTIVE_PORTAL_CHECK
 or CONNECTED

 (Those states can be obtained as NetworkInfo.DetailedState objects by calling
 the NetworkInfo object method: "networkInfo.getDetailedState()")
*/
    /*
     * NetworkInfo object associated with the Wi-Fi network.
     * It won't be null when "android.net.wifi.STATE_CHANGE" action intent arrives.
     */
    NetworkInfo networkInfo = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);

    if (networkInfo != null && networkInfo.isConnected()) {
        // TODO: Place the work here, like retrieving the access point's SSID

        /*
         * WifiInfo object giving information about the access point we are connected to.
         * It shouldn't be null when the new Wi-Fi network state is CONNECTED, but it got
         * null sometimes when connecting to a "virtualized Wi-Fi router" in API15.
         */
        WifiInfo wifiInfo = intent.getParcelableExtra(WifiManager.EXTRA_WIFI_INFO);
        String ssid = wifiInfo.getSSID();
    }
}
}

权限：

None
3
投票

Android O删除了接收wifi状态更改的隐式广播的可能性。因此，如果您的应用已关闭，您将无法接收它们。新的WorkManager能够在你的应用程序关闭时运行，所以我已经尝试了一下它似乎工作得很好：

将此添加到您的依赖项：

implementation "android.arch.work:work-runtime:1.0.0-alpha08"

WifiConnectWorker.kt

class WifiConnectWorker : Worker() {

    override fun doWork(): Result {
        Log.i(TAG, "I think we connected to a wifi")
        return Result.SUCCESS
    }
}

Manaktivitykkt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)

        val workManager = WorkManager.getInstance()

        // Add constraint to start the worker when connecting to WiFi
        val request = OneTimeWorkRequest.Builder(WifiConnectWorker::class.java)
            .setConstraints(Constraints.Builder()
                .setRequiredNetworkType(UNMETERED)
                .build())
            .build()

        // The worker should be started, even if your app is closed
        workManager.beginUniqueWork("watch_wifi", REPLACE, request).enqueue()
    }
}

请记住，这只是对一次性通知的快速测试。当打开和关闭WiFi时，还有更多工作要做，以便始终得到通知。

PS：当应用程序强制退出时，工作人员没有启动，似乎WorkManager正在取消请求。

2
投票

以下是我的代码示例，它考虑了用户在连接到Wifi时仅允许通信的偏好。

我在尝试下载内容之前从IntentService中调用此代码。

请注意，如果没有任何网络连接，NetworkInfo将是null。

private boolean canConnect()
{
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    boolean canConnect = false;
    boolean wifiOnly = SharedPreferencesUtils.wifiOnly();

    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    if(networkInfo != null)
    {
        if(networkInfo.isConnected())
        {
            if((networkInfo.getType() == ConnectivityManager.TYPE_WIFI) ||
               (networkInfo.getType() != ConnectivityManager.TYPE_WIFI && !wifiOnly))
            {
                canConnect = true;
            }
        }
    }

    return canConnect;
}
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