在标题中，我对绑定服务有一个非常奇怪的问题。
确保我的服务以两种方式运作。它由循环AlarmBroadcast（由public class MsgService extends Service {
private static final String LOG_MSG = "MSG_SERVICE";
private final Context context = this;
private List<Message> clients;
private Messenger messenger = new Messenger(new IncomingHandler(this));
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.v(LOG_MSG, "Message service started");
new AsyncMsgsDownloadManager(this).execute();
return START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return messenger.getBinder();
}
@Override
public void onCreate() {
Log.v(LOG_MSG, "Message service created");
HandlerThread thread = new HandlerThread("ServiceStartArguments",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
exceptionHandler = new ExceptionHandler();
clients = Collections.synchronizedList(new ArrayList<Message>());
}
@Override
public void onDestroy() {
Log.v(LOG_MSG, "Message service destroyed");
}
private void sendResponseToClients() {
Thread t = new Thread(new Runnable() {
@Override
public void run() {
//update local database
}
});
t.join();
for(Message client : clients) {
if ("TasksPerson".equals(client.obj)) {
client.replyTo.send(Message.obtain(null, MSG.REFRESH_TASKS.ordinal()));
break;
}
}
}
static class IncomingHandler extends Handler {
private final WeakReference<MsgService> _service;
IncomingHandler(MsgService msgService) {
_service = new WeakReference<>(msgService);
}
@Override
public void handleMessage(Message msg) {
switch (MSG.getEnum(msg.what)) {
case REGISTER_CLIENT: {
_service.get().clients.add(msg);
break;
}
case UNREGISTER_CLIENT: {
_service.get().clients.remove(msg);
break;
}
}
}
}
static class AsyncMsgsDownloadManager extends AsyncTask<Void, Void, Void> {
private final WeakReference<MsgService> service;
AsyncMsgsDownloadManager(MsgService service) {
this.service = new WeakReference<>(service);
}
@Override
protected Void doInBackground(Void... voids) {
//downloading data from server
return null;
}
@Override
protected void onPostExecute(Void result) {
try {
service.get().stopSelf();
} catch (NullPointerException e) {
//Service already closed?
}
}
}
}
）启动，用于下载数据，并且可以与客户端绑定。
服务下载数据到本地数据库，当一些特定客户端连接时，下载（将使用此数据）服务获取它并向客户端发送REFRESH标志，从而对数据库应用更改。
onStartCommand问题是，当我将客户端消息绑定到我的服务时，一切都没问题 - 它出现在客户列表中，我可以通过客户端信使简单地发送消息。但是当某个客户端连接并且服务获取{{1}}列表崩溃时。
列表仍然引用了对象（我检查了它，它在android studio中的数字相同），但是这个对象如果只有null或零参数。