我有一项服务和一项活动。在服务中，我广播从网络收到的消息，并在活动中显示这些消息。这很好用。但是当活动在后台时，所有消息都会丢失。
如何在 onResume（或 onCreate）活动中从服务器获取最后一条消息（如果存在）？
编辑： 服务中：
public class server extends Service implements Runnable
{
@Override
public void onCreate()
{
}
@Override
public IBinder onBind(Intent arg0)
{
return null;
}
@Override
public void onStart(Intent intent, int startID)
{
//initializing socket and begining listen
new Thread(this).start();
}
public void run()
{
String readed;
while (true)
{
if(reader == null) continue;
try
{
if ((readed = reader.readLine()) != null)
{
Intent intent = new Intent(SEND_DATA_INTENT);
intent.putExtra("type", "message");
intent.putExtra("content", readed.substring(1));
sendBroadcast(intent);
Thread.sleep(100);
}
}
catch (Exception ee) { }
}
}
}
并在活动中：
public class menhaj extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
@Override
protected void onResume()
{
if (dataUpdateReceiver == null) dataUpdateReceiver = new DataReciver();
IntentFilter intentFilter = new IntentFilter(server.SEND_DATA_INTENT);
registerReceiver(dataUpdateReceiver, intentFilter);
super.onResume();
};
@Override
protected void onPause()
{
if (dataUpdateReceiver != null) unregisterReceiver(dataUpdateReceiver);
super.onPause();
};
private class DataReciver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
if (intent.getAction().equals(server.SEND_DATA_INTENT))
{
Bundle bdl = intent.getExtras();
String type = bdl.getString("type");
if (type.equals("message"))
{
String message = bdl.getString("content");
db.addMessage(message);
showMessage(message);
}
}
}
}
}