我的Android
应用程序使用AndroidAsync
库连接到一个带有Socket.IO
客户端的Node.js
服务器。该套接字客户端是通过服务建立的。
- 当应用程序开启时,套接字需要保持打开/连接状态
- 当应用程序关闭时,套接字可以关闭
- 有一种情况例外,当应用程序关闭时套接字需要保持打开状态
我目前在应用程序中的每个Activity
的onResume
中启动Socket.IO服务,并在onPause
中停止。
这似乎非常低效,因为每次按下主页按钮或切换到应用程序中的另一个活动时,我都会停止套接字并创建一个新的。
如何最好地处理上述关于保持套接字打开的要求?
public class SocketIOService extends Service {
private Preferences prefs;
private SocketIOClient socket;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
try {
ConnectCallback callback = new ConnectCallback() {
@Override
public void onConnectCompleted(Exception ex, SocketIOClient client) {
if (ex != null) {
ex.printStackTrace();
return;
}
Log.v("SOCKET IO CONNECTION", "ESTABLISHED");
client.setDisconnectCallback(new DisconnectCallback() {
@Override
public void onDisconnect(Exception e) {
Log.v("SOCKET IO CONNECTION", "TERMINATED");
}
});
client.setErrorCallback(new ErrorCallback() {
@Override
public void onError(String error) {
Log.e("SOCKET IO ERROR", error);
}
});
client.setExceptionCallback(new ExceptionCallback() {
@Override
public void onException(Exception e) {
e.printStackTrace();
}
});
client.setReconnectCallback(new ReconnectCallback() {
@Override
public void onReconnect() {
Log.v("SOCKET IO CONNECTION", "RECONNECTED");
}
});
client.on(EVENT_NEWS, new EventCallback() {
@Override
public void onEvent(JSONArray argument, Acknowledge acknowledge) {
Log.v("EVENT:NEWS", argument.toString());
}
});
client.on(EVENT_MESSAGE_RECEIVE, new EventCallback() {
@Override
public void onEvent(JSONArray argument, Acknowledge acknowledge) {
handleMessageReceive(argument);
}
});
}
};
socket = SocketIOClient.connect(AsyncHttpClient.getDefaultInstance(), URL_SERVER, callback).get();
JSONArray array = new JSONArray();
JSONObject obj = new JSONObject();
prefs = new Preferences(this);
try {
obj.put(KEY_USER_ID, prefs.getUserId());
} catch (JSONException e) {
e.printStackTrace();
}
array.put(obj);
socket.emit(EVENT_LOG_USER_ID, array);
Log.v("SOCKET LOG USER ID", array.toString());
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
// If we get killed, after returning from here, restart
return START_REDELIVER_INTENT;
}
@Override
public void onDestroy() {
Log.v("SOCKET IO SERVICE", "STOPPED");
if (socket != null) {
if (socket.isConnected()) {
socket.disconnect();
}
}
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private void handleMessageReceive(JSONArray json) {
ChatMessage message = JReader.createMessage(json);
}
}