实时监听网络状态
很多时候我们都需要实时监听网络状态，当网络状态发生变化后通知程序实行不同的策略。这里，我采用Service+BroadcastReceiver的形式实时监听网络变化。
原理是程序在背后启一个Service，在Service中注册一个广播，当网络变化时会产生一个ConnectivityManager.CONNECTIVITY_ACTION事件，只要监听这个事件就可以了。代码如下：
import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.IBinder;import android.util.Log;public class NetworkStateService extends Service{private static final String tag="tag";private ConnectivityManager connectivityManager; private NetworkInfo info; private BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) { Log.d(tag, "网络状态已经改变"); connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); info = connectivityManager.getActiveNetworkInfo(); if(info != null && info.isAvailable()) { String name = info.getTypeName(); Log.d(tag, "当前网络名称：" + name); //doSomething() } else { Log.d(tag, "没有可用网络"); //doSomething() } } } }; @Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {super.onCreate();IntentFilter mFilter = new IntentFilter();mFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);registerReceiver(mReceiver, mFilter);}@Overridepublic void onDestroy() {super.onDestroy();unregisterReceiver(mReceiver);}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {return super.onStartCommand(intent, flags, startId);}}
别忘了在Manifast中配置这个Service：
<service android:enabled="true" android:name="com.reyo.util.NetworkStateService" />
还有权限：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
在必要的地方启动该Service即可：
Intent i=new Intent(context,NetworkStateService.class);startService(i);
另外附加几个Android网络连接的判断
1）判断是否有网络连接
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; }
2）判断WIFI网络是否可用
public boolean isWifiConnected(Context context) { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mWiFiNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_WIFI); if (mWiFiNetworkInfo != null) { return mWiFiNetworkInfo.isAvailable(); } } return false; }
3）判断MOBILE网络是否可用
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; }
4）获取当前网络连接的类型信息
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; }
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