wifi的状态返回假，即使它是连接

Question

我在应用程序的调用onStart查询手机的wifi状态，但即使连接它返回false，我已经尝试过很多事情，但没有奏效

这里就是我做

@Override protected void onStart() { 
    super.onStart(); 
    onStartStates(); 
} 

onStartStates（）方法

private void onStartStates(){ 

    ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo net = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 

    Log.d(TAG, "Wifi State 1"+net.isConnected()); 
    Log.d(TAG, "Wifi State 2"+getCurrentSsid(esActivity.this)); 
} 

getCurrentSsid（）方法

public static String getCurrentSsid(Context context) { 
    WifiInfo wifiInfo = getCurrentWifiInfo(context); 
    if (wifiInfo != null) { 
     return wifiInfo.getSSID(); 
    } 
    return null; 
} 

public static WifiInfo getCurrentWifiInfo(Context context) { 
    final ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); 
    final NetworkInfo networkInfo = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
    if (networkInfo != null && networkInfo.isConnected()) { 
     final WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); 
     return wifiManager.getConnectionInfo(); 
    } 

    return null; 
} 

两个方法返回false，即使我切换WiFi打开刚开始我的应用程序...任何想法

Answer 1

试试下面的方法来检测设备是否有网络连接。获取当前活动的网络可能会对您有所帮助。

/** 
* Check for <code>TYPE_WIFI</code> and <code>TYPE_MOBILE</code> connection 
* using <code>isConnected()</code> Checks for generic Exceptions and writes 
* them to LogCat as <code>CheckConnectivity Exception</code>. Make sure 
* AndroidManifest.xml has appropriate permissions. 
* 
* @param con 
*   Application context 
* @return Boolean 
*/ 
public static boolean hasConnectivity(Context con) 
{ 
    ConnectivityManager connectivityManager; 
    NetworkInfo   wifiInfo; 
    NetworkInfo mobileInfo; 
    try 
    { 
     connectivityManager = (ConnectivityManager) con.getSystemService(Context.CONNECTIVITY_SERVICE); 

     NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo(); 
     boolean serviceAvailable = (netInfo!=null && netInfo.isConnected())? true:false; 

     wifiInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
     mobileInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); 
     if (wifiInfo.isConnected() || mobileInfo.isConnected() || serviceAvailable) 
     { 
      Logger.info(TAG + " : " + true); 
      return true; 
     } 
    } 
    catch (Exception e) 
    { 
     Logger.info(TAG + ": hasConnectivity: Exception: " + e.getMessage()); 
    } 
    Logger.error(TAG + " : " + false); 
    return false; 
}