Android检查网络状态步骤

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android 如何检查网络连接状态，是android开发中一个常见的问题。

获取网络信息需要在AndroidManifest.xml文件中加入相应的权限：

<span style="font-size:24px;"><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> </span>

<span style="font-size:24px;">public boolean isNetworkConnected(Context context) { 
    if (context != null) { 
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context 
                .getSystemService(Context.CONNECTIVITY_SERVICE); 
        NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); 
       if (mNetworkInfo != null) { 
          return mNetworkInfo.isAvailable(); 
          } 
        } 
       return false; 
} </span>

2）判断WIFI网络是否可用

<span style="font-size:24px;">public boolean isWifiConnected(Context context) { 
   if (context != null) { 
         ConnectivityManager mConnectivityManager = (ConnectivityManager) context 
      .getSystemService(Context.CONNECTIVITY_SERVICE); 
        NetworkInfo mWiFiNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_WIFI); //WIFI
        if (mWiFiNetworkInfo != null) { 
          return mWiFiNetworkInfo.isAvailable(); 
          } 
      } 
      return false; 
} </span>

<span style="font-size:24px;">public boolean isMobileConnected(Context context) { 
    if (context != null) { 
       ConnectivityManager mConnectivityManager = (ConnectivityManager) context 
.getSystemService(Context.CONNECTIVITY_SERVICE); 
       NetworkInfo mMobileNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_MOBILE); 
       if (mMobileNetworkInfo != null) { 
           return mMobileNetworkInfo.isAvailable(); 
         } 
       } 
     return false; 
} </span>

<span style="font-size:24px;">public static int getConnectedType(Context context) { 
     if (context != null) { 
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); 
         NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); 
        if (mNetworkInfo != null && mNetworkInfo.isAvailable()) { 
            return mNetworkInfo.getType(); 
        } 
     } 
      return -1; 
} </span>

当我们要在程序中监听网络状态时，只要一下几个步骤即可：
1、定义一个Receiver重载其中的onReceive函数，在其中完成所需要的功能，如根据WIFI和GPRS是否断开来改变空间的外观

<span style="font-size:24px;">onnectionReceiver = new BroadcastReceiver() { 
@Override 
   public void onReceive(Context context, Intent intent) { 
        ConnectivityManager connectMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); 
       NetworkInfo mobNetInfo = connectMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); 
       NetworkInfo wifiNetInfo = connectMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
      if (!mobNetInfo.isConnected() && !wifiNetInfo.isConnected()) { 
       Log.i(TAG, "unconnect"); 
       // unconnect network 
        }else { 
        // connect network 
        } 
    } 
}; </span>

<span style="font-size:24px;">IntentFilter intentFilter = new IntentFilter(); 
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); 
registerReceiver(connectionReceiver, intentFilter); </span>

<span style="font-size:24px;">if (connectionReceiver != null) { 
  unregisterReceiver(connectionReceiver); 
} </span>

Android 监控网络状态

<span style="font-size:24px;">public static boolean isNetworkAvailable(Context context) { 
      ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); 
    if (connectivity == null) { 
       Log.i("NetWorkState", "Unavailabel"); 
        return false; 
      } else { 
        NetworkInfo[] info = connectivity.getAllNetworkInfo(); 
        if (info != null) { 
        for (int i = 0; i < info.length; i++) { 
          if (info[i].getState() == NetworkInfo.State.CONNECTED) { 
          Log.i("NetWorkState", "Availabel"); 
          return true; 
         } 
      } 
     } 
   } 
    return false; 
} </span>

上面这个方法就是判断网络是否连接的代码，返回true表示有网络，返回false表示无网络。 在Android网络应用程序开发中，经常要判断网络连接是否可用，因此经常有必要监听网络状态的变化。android的网络状态监听可以用BroadcastReceiver来接收网络状态改变的广 播，具体实现如下

<span style="font-size:24px;">@Override 
public void onReceive(Context context, Intent intent) { 
   Log.e(TAG, "网络状态改变"); 
   boolean success = false; 
  //获得网络连接服务 
    ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); 
    // State state = connManager.getActiveNetworkInfo().getState(); 
    State state = connManager.getNetworkInfo( ConnectivityManager.TYPE_WIFI).getState(); // 获取网络连接状态 
    if (State.CONNECTED == state) { // 判断是否正在使用WIFI网络 
     success = true; 
      } 
     state = connManager.getNetworkInfo( 
     ConnectivityManager.TYPE_MOBILE).getState(); // 获取网络连接状态 
     if (State.CONNECTED != state) { // 判断是否正在使用GPRS网络 
       success = true; 
     } 
     if (!success) { 
      Toast.makeText(LocationMapActivity.this, "您的网络连接已中断", Toast.LENGTH_LONG).show(); 
     } 
} </span>

<span style="font-size:24px;">/注册网络监听 
IntentFilter filter = new IntentFilter(); 
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); 
registerReceiver(mNetworkStateReceiver, filter); 
//在Activity中的onDestroy中:' 
unregisterReceiver(mNetworkStateReceiver); //取消监听 </span>

<span style="font-size:24px;">public static int getAPNType(Context context){ 
  int netType = -1; 
   ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); 
   NetworkInfo networkInfo = connMgr.getActiveNetworkInfo(); 
   if(networkInfo==null){ 
     return netType; 
    } 
   int nType = networkInfo.getType(); 
   if(nType==ConnectivityManager.TYPE_MOBILE){ 
     Log.e("networkInfo.getExtraInfo()", "networkInfo.getExtraInfo() is "+networkInfo.getExtraInfo()); 
   if(networkInfo.getExtraInfo().toLowerCase().equals("cmnet")){ 
          netType = CMNET; 
     } 
   else{ 
          netType = CMWAP; 
    } 
    } 
   else if(nType==ConnectivityManager.TYPE_WIFI){ 
          netType = WIFI; 
    } 
    return netType; 
} </span>

Android检查网络状态步骤

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原文地址：http://blog.csdn.net/tuke_tuke/article/details/51684042