Android-監聽網絡狀態

1.註冊一個廣播接收器，監聽網絡狀態
private void Start()
{
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
this.registerReceiver(myBroadcastReceiver, filter);
}

2.取消註冊廣播器
private void Stop()
{
this.unregisterReceiver(myBroadcastReceiver);
}

3.新建監聽類NetworkConnectChangedReceiver繼承BroadcastReceiver

public class NetworkConnectChangedReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
// 這個監聽wifi的打開與關閉，與wifi的鏈接無關
if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction()))
{
int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
switch (wifiState)
{
case WifiManager.WIFI_STATE_ENABLED:
Log.e("APActivity", "WIFI_STATE_ENABLED");
break;
case WifiManager.WIFI_STATE_ENABLING:
Log.e("APActivity", "WIFI_STATE_ENABLING");
break;
case WifiManager.WIFI_STATE_DISABLED:
Log.e("APActivity", "WIFI_STATE_DISABLED");
break;
case WifiManager.WIFI_STATE_DISABLING:
Log.e("APActivity", "WIFI_STATE_DISABLING");
break;
}
}
// 這個監聽wifi的鏈接狀態便是否連上了一個有效無線路由，當上邊廣播的狀態是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的時候，根本不會接到這個廣播。
// 在上邊廣播接到廣播是WifiManager.WIFI_STATE_ENABLED狀態的同時也會接到這個廣播，固然剛打開wifi確定尚未鏈接到有效的無線
if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction()))
{
Parcelable parcelableExtra = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (null != parcelableExtra)
{
NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;
switch (networkInfo.getState())
{
case CONNECTED:
Log.e("APActivity", "CONNECTED");
break;
case CONNECTING:
Log.e("APActivity", "CONNECTING");
break;
case DISCONNECTED:
Log.e("APActivity", "DISCONNECTED");
break;
case DISCONNECTING:
Log.e("APActivity", "DISCONNECTING");
break;
case SUSPENDED:
Log.e("APActivity", "SUSPENDED");
break;
case UNKNOWN:
Log.e("APActivity", "UNKNOWN");
break;
default:
break;
}
}
}
// 這個監聽網絡鏈接的設置，包括wifi和移動數據的打開和關閉。
// 最好用的仍是這個監聽。wifi若是打開，關閉，以及鏈接上可用的鏈接都會接到監聽。見log
// 這個廣播的最大弊端是比上邊兩個廣播的反應要慢，若是隻是要監聽wifi，我以爲仍是用上邊兩個配合比較合適
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction()))
{
NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if (info != null)
{
StringBuilder sb = new StringBuilder();
sb.append("info.getTypeName() : " + info.getTypeName() + "\n");
sb.append("getSubtypeName() : " + info.getSubtypeName() + "\n");
sb.append("getState() : " + info.getState() + "\n");
sb.append("getDetailedState() : " + info.getDetailedState().name() + "\n");
sb.append("getDetailedState() : " + info.getExtraInfo() + "\n");
sb.append("getType() : " + info.getType());
Log.e("APActivity", sb.toString());
}
}
}
}

當網絡鏈接接通的時候，是用的是Wifi或者3G網絡。利用本文所述,能夠實現記錄什麼時候使用的是Wifi，什麼時候使用的是3G網絡。

public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(action)) {
NetworkInfo ni = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if (ni.getState() == State.CONNECTED && ni.getType() == ConnectivityManager.TYPE_WIFI) {
Log.v("kevin", "wifi connected");
} else if(ni.getState() == State.DISCONNECTED && ni.getType() == ConnectivityManager.TYPE_WIFI){
Log.v("kevin", "wifi disconnected");
}
}
}
}