如何从IntentService类更新编辑文本？
如何从IntentService类更新编辑文本？
提问于 2018-06-01 15:41:28
我正在制作一个聊天应用程序，并使用意图服务发送消息到firebase数据库，即使活动被销毁。当上传成功时，我想在IntentService类的Edittext中清除文本，但不知道怎么做。
酸性类代码
Intent sendmsgService = new Intent(getApplicationContext(),SendMessageService.class);
sendmsgService.putExtra("msg",message);
sendmsgService.putExtra("time",time);
sendmsgService.putExtra("cuser",current_user);
sendmsgService.putExtra("otheruser",otherusername);
startService(sendmsgService);IntentService类代码
public class SendMessageService extends IntentService {
DatabaseReference msgDatabase , mDatabase;
String current_user,otherusername,message,time;
public SendMessageService() {
super("SendMessageService");
mDatabase = FirebaseDatabase.getInstance().getReference();
msgDatabase = mDatabase.child("messages").child(current_user).child(otherusername);
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
assert intent!=null;
message = intent.getStringExtra("msg");
time = intent.getStringExtra("time");
current_user = intent.getStringExtra("cuser");
otherusername = intent.getStringExtra("otheruser");
DatabaseReference push_database = msgDatabase.push();
String msg_push = push_database.getKey();
DatabaseReference d = FirebaseDatabase.getInstance().getReference();
String cuser = current_user+"/"+otherusername+"/";
String ouser = otherusername+"/"+current_user+"/";
Map<String,Object> chatitems = new HashMap<>();
chatitems.put("seen",false);
chatitems.put("msg",message);
chatitems.put("from",current_user);
Map<String,Object> msgitemmap = new HashMap<>();
chatitems.put("time", ServerValue.TIMESTAMP);
msgitemmap.put("servertime",ServerValue.TIMESTAMP);
msgitemmap.put("time",time);
msgitemmap.put("msg",message);
msgitemmap.put("from",current_user);
msgitemmap.put("to",otherusername);
msgitemmap.put("seen",false);
msgitemmap.put("key",msg_push);
Map<String,Object> chatmap = new HashMap<>();
chatmap.put("chatlist/"+cuser,chatitems);
chatmap.put("chatlist/"+ouser,chatitems);
chatmap.put("messages/"+cuser+msg_push,msgitemmap);
chatmap.put("messages/"+ouser+msg_push,msgitemmap);
d.updateChildren(chatmap).addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
//Here i want to clear the edittext
}
});
}}如果有任何其他解决方案，请提出建议。
回答 2
Stack Overflow用户
回答已采纳
发布于 2018-06-01 15:49:24
Intent服务在后台线程上运行，而不是在main(UI)线程上运行，但我们可以使用处理程序机制向activity发送/更新数据。要将数据发送到activity，您需要在activity中声明handler，如下所示：
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
Bundle reply = msg.getData();
// do whatever with the bundle here
}
};在intent服务类中，以这种方式传递数据：
Bundle bundle = intent.getExtras();
if (bundle != null) {
Messenger messenger = (Messenger) bundle.get("messenger");
Message msg = Message.obtain();
msg.setData(data); //put the data here
try {
messenger.send(msg);
} catch (RemoteException e) {
Log.i("error", "error");
}
}最重要的是从活动调用意图服务，将处理程序传递给它：
Intent intent = new Intent(this, IntentService1.class);
intent.putExtra("messenger", new Messenger(handler));
startService(intent);希望这能对你有所帮助
Stack Overflow用户
发布于 2018-06-01 15:52:46
简单的解决方案是使用Broadcast Reciever在您的activity类中声明这一点
BroadcastReceiver broadCastNewMessage = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// do your stuff here
edittext.setText("");
}
};现在在onCreate()中注册以下内容
registerReceiver(this.broadCastNewMessage, new IntentFilter("uploading_done"));在onDestroy()中
unregisterReceiver(broadCastNewMessage);现在，从要更新活动的服务类中调用此方法
sendBroadcast(new Intent().setAction("uploading_done"));页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50638430
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