當WIFI或3G網絡發生變化時，BroadcastReceiver

我開發了一款android應用程序，該應用程序會在WiFi或3G網絡發生變化時更新服務器數據庫。我實施了一個BroadcastReceiver，它收聽WiFi change or a 3G connectivity change。當WIFI或3G網絡發生變化時，BroadcastReceiver

問題是此代碼在Android版本4.x.x中不起作用。即使網絡已啓用或WiFi已啓用，「互聯網已連接」烤麪包也不會出現。

它在android 2.3.x和3.x.x中完美工作，「互聯網已連接」toast出現，並且數據庫也被更新。

這是MainActivity.java文件：

public class MainActivity extends BroadcastReceiver { 


    @Override 
    public void onReceive(Context context, Intent intent) { 
     // TODO Auto-generated method stub 
     Integer flag; 
     flag = 0; 
     ConnectivityManager check = (ConnectivityManager) context 
       .getSystemService(Context.CONNECTIVITY_SERVICE); 
     NetworkInfo[] info = check.getAllNetworkInfo();  

     for (int i = 0; i < info.length; i++) { 
      if (info[i].getState() == NetworkInfo.State.CONNECTED) { 
       Toast.makeText(context, "Internet is connected", 
         Toast.LENGTH_SHORT).show(); 
       flag = 1; 
      } 
     } 

     if (flag != 0) { 

      StringBuffer sb = new StringBuffer(); 

      TelephonyManager TelephonyMgr = (TelephonyManager) context 
        .getSystemService(Context.TELEPHONY_SERVICE); 
      m_deviceId = TelephonyMgr.getDeviceId(); 

      m_androidId = Secure.getString(context.getContentResolver(), 
        Secure.ANDROID_ID); 

      String bm = android.os.Build.MANUFACTURER + "," 
        + android.os.Build.MODEL; 
      System.out.println("Device Name: " + bm + "\n"); 

      try { 

       URL url = new URL(
         "http://saslabtech.com/atsdemo/import_vr.php?d=" 
           + URLEncoder.encode(m_deviceId, "UTF-8") + "&a=" 
           + URLEncoder.encode(m_androidId, "UTF-8") 
           + "&model=" + URLEncoder.encode(bm, "UTF-8") 
           + "&ip=" 
           + URLEncoder.encode(getLocalIpv4Address(), "UTF-8")); 
       System.out.println(url); 
       HttpURLConnection con = (HttpURLConnection) url 
         .openConnection(); 
       readStream(con.getInputStream()); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      Toast.makeText(context, "Updated", Toast.LENGTH_SHORT).show(); 
     } 
    } 
}

這是AndroidManifest.xml文件：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.read" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="10" 
     android:targetSdkVersion="19" /> 

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

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 

     <receiver android:name=".MainActivity" > 
      <intent-filter> 
       <action android:name="android.net.conn.CONNECTIVITY_CHANGE" /> 
       <action android:name="android.net.wifi.WIFI_STATE_CHANGED" /> 
      </intent-filter> 
     </receiver> 

    </application> 

</manifest>

我想不通我要去哪裏錯了。

謝謝！

來源

2015-02-09 Mimi Paul

請指定*不工作*表示 – TheLostMind 2015-02-09 12:42:50

「網絡連接」網絡啓用後，即使敬酒不出現或無線網絡已啓用。 – 2015-02-09 12:47:54

請不要創建一個名爲'MainActivity'的類，除非它實際上擴展了'Activity'類。另外，除非您有實際的MAIN/LAUNCHER'Activity'，否則用戶無法啓動您的應用程序，並且您的'AndroidManifest.xml'中註冊的任何'BroadcastReceiver'永遠不會被激活。 – Squonk 2015-02-09 12:53:36

你可以簡單地檢查連接如下所述：

@Override 
public void onReceive(Context context, Intent intent) { 
    Log.d("Network Monitoring", "onReceive "); 

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


      boolean noConnectivity = intent.getBooleanExtra(
        ConnectivityManager.EXTRA_NO_CONNECTIVITY, false); 

      if (noConnectivity) { 
       return;//you don't have internet connectivity 
      } 
      //you have internet connectivity, so you may put your code here for further process 

     } 


}

來源

2015-02-09 12:55:06

當WIFI或3G網絡發生變化時，BroadcastReceiver

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