问题描述
在我的android应用程序中，即使该应用程序未激活，我仍在尝试实现firebase数据库的childEventListener.表示，只要firebase db特定子项具有新条目，它都应通知用户.所以直到现在我都做完了，
in my android application i am trying to implement childEventListener of firebase database even when the app is not active.means whenever the firebase db particular child has a new entry it should notify the user..so till now i have done with this,
我已在清单文件中声明服务为
i have declared service in manifest file as
<service android:name=".ChildEventListener"/>
然后我的ChildEventListener类如下
then my ChildEventListener class is as follows
public class ChildEventListener extends Service {
FirebaseAuth auth;
NotificationCompat.Builder builder;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
retrivemsg();
return START_STICKY;
}
public void retrivemsg()
{
DatabaseReference mdb= FirebaseDatabase.getInstance().getReference("messages/"+auth.getCurrentUser().getUid());
builder=new NotificationCompat.Builder(this,"onchildadded");
mdb.addChildEventListener(new com.google.firebase.database.ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
String msg=dataSnapshot.child("msg").getKey();
builder.setSmallIcon(R.drawable.send);
builder.setContentTitle("child added");
builder.setContentText(msg);
NotificationManager notificationManager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(1,builder.build());
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
但是我尝试了，但是没有运气...即使添加了新孩子，我也没有收到任何通知....即使应用程序处于前台状态也没有...
but i tried, but no luck... even the new child is added, i am not getting any notification.... not even when the app is in foreground...
推荐答案
实际上，我们可以在清单文件中启动服务.但是在我的情况下，我的错误是我没有在我真正想要启动它的地方添加启动服务语句.因此只需添加
actually we can start a service in manifest fie. but in my case my mistake was i didnt added start service statement where i actually want to start it. so just by adding
startService(new Intent(this, ChildEventListener.class));
我是一个我想开始的班级.解决了我的问题.
i a class where i want to start it. solved my problem.
-Thanx @ merterpam，指出了我的错误
-Thanx @ merterpam, for pointing out my mistake
这篇关于服务中的android-firebase childEventListener的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！