【总结备用】Android监听网络状态实现(BroadcastReceiver + Service)

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：

 

/**
 * ConnectionChangeReceiver
 *
 * @author benny Yang on 2011-12-23
 *
 */
public class ConnectionChangeReceiver extends BroadcastReceiver {

    private static final String TAG =ConnectionChangeReceiver.class.getSimpleName();

    @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) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    // State state = connManager.getActiveNetworkInfo().getState();
    // 获取WIFI网络连接状态
    State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
    // 判断是否正在使用WIFI网络
    if (State.CONNECTED == state) {
    success = true;
    }
    // 获取GPRS网络连接状态
    state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
    // 判断是否正在使用GPRS网络
    if (State.CONNECTED != state) {
    success = true;
    }

    if (!success) {
    Toast.makeText(context, context.getString(R.string.your_network_has_disconnected), Toast.LENGTH_LONG).show();
    }
    }

记得在Manifest文件里面进行权限声明，和广播接收器注册。

 

 

< !-- Needed to check when the network connection changes -->
< uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
< receiver android:name="you_package_name.ConnectionChangeReceiver"   android:label="NetworkConnection">
< intent-filter>
      < action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
< /intent-filter>
< /receiver>

 

使用方式一：

1. 在Activity的onCreate中:
//注册网络监听 
IntentFilter filter = new IntentFilter();  
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); 
registerReceiver(mNetworkStateReceiver, filter); 
2. 在Activity中的onDestroy中:
//取消监听
unregisterReceiver(mNetworkStateReceiver); 

 

使用方式二：

1. 应用启动时，启动Service，在Service的onCreate方法中注册网络监听：

//注册网络监听 
IntentFilter filter = new IntentFilter();  
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); 
registerReceiver(mNetworkStateReceiver, filter); 

2. 应用退出时，Service关闭，在Service的onDestroy方法中取消监听：
//取消监听
unregisterReceiver(mNetworkStateReceiver);