我尝试从stackoverflow和github学习android编程，
我从以下位置下载此源：
https://github.com/PiracyIzSed/HospitalApplication
在android studio中打开并设置firebase，在Memu和我的手机中运行它， 约会有效，但未显示通知。
请帮助我在更改约会状态时如何发出此通知。
谢谢。
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package com.android.hospitalapplication.UtilityAndNetworkingClasses;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import com.android.hospitalapplication.Activities.AppointmentReceiptActivity;
import com.android.hospitalapplication.Activities.Doctor.DoctorActivity;
import com.android.hospitalapplication.Activities.Patient.AppointmentStatusActivity;
import com.android.hospitalapplication.Activities.Patient.PatientActivity;
import com.android.hospitalapplication.R;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* Created by Gaurav on 31-12-2017.
*/
public class FirebaseNotificationsService extends FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
Log.d("payload :", "" + remoteMessage.getData());
String titleNotif = remoteMessage.getData().get("title_notif");
String contentNotif = remoteMessage.getData().get("body_notif");
String from = remoteMessage.getData().get("from_user_id");
String typeNotif = remoteMessage.getData().get("type");
if(typeNotif.equals("request")){
Intent i = new Intent(this, DoctorActivity.class);
i.putExtra("notif_frag","new_req");
PendingIntent resultingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
createNotification(titleNotif,contentNotif,resultingIntent);
}
else if(typeNotif.equals("confirmed")){
Intent i = new Intent(this, AppointmentReceiptActivity.class);
String docId = from;
String patId = remoteMessage.getData().get("to_user_id");
i.putExtra("doc_id",docId);
i.putExtra("pat_id",patId);
PendingIntent resultingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
createNotification(titleNotif,contentNotif,resultingIntent);
}
else if(typeNotif.equals("rescheduled")){
Intent i = new Intent(this, AppointmentReceiptActivity.class);
String docId = from;
String patId = remoteMessage.getData().get("to_user_id");
i.putExtra("doc_id",docId);
i.putExtra("pat_id",patId);
PendingIntent resultingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
createNotification(titleNotif,contentNotif,resultingIntent);
}
else if(typeNotif.equals("follow")){
Intent i = new Intent(this, AppointmentReceiptActivity.class);
String docId = from;
String patId = remoteMessage.getData().get("to_user_id");
i.putExtra("doc_id",docId);
i.putExtra("pat_id",patId);
PendingIntent resultingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
createNotification(titleNotif,contentNotif,resultingIntent);
}
else if(typeNotif.equals("declined")){
Intent i = new Intent(this, AppointmentStatusActivity.class);
PendingIntent resultingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
createNotification(titleNotif,contentNotif,resultingIntent);
}
}
private void createNotification(String titleNotif, String contentNotif, PendingIntent resultPendingIntent) {
Notification notification = new Notification();
notification.defaults |= Notification.DEFAULT_SOUND;
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);
mBuilder.setDefaults(notification.defaults);
mBuilder.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(titleNotif)
.setContentText(contentNotif)
.setAutoCancel(true)
.setVibrate(new long[]{50, 350, 200, 350, 200})
.setLights(Color.RED, 3000, 3000)
.setContentIntent(resultPendingIntent);
int mNotificationId = (int) System.currentTimeMillis();
NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
public void addReminder(final String docID, final String patId){
DatabaseReference dbrefUsers = FirebaseDatabase.getInstance().getReference("Users").child(docID);
dbrefUsers.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
final String name = dataSnapshot.child("name").getValue().toString();
DatabaseReference dbrefApt = FirebaseDatabase.getInstance().getReference("Appointments").child(docID).child(patId);
dbrefApt.addValueEventListener(new ValueEventListener() {
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String date = dataSnapshot.child("apt_date").getValue().toString();
String time = dataSnapshot.child("apt_time").getValue().toString();
long eventTime = 0;
try {
eventTime = getTimeInMillis(date+" "+time);
Log.d("time in mils :",""+eventTime);
} catch (ParseException e) {
e.printStackTrace();
}
SimpleDateFormat df = new SimpleDateFormat("HH:mm");
time =df.format(time);
String s[] = time.split(":");
int hr = Integer.parseInt(s[0]);
int min = Integer.parseInt(s[1]);
NotificationScheduler.setReminder(getApplicationContext(), PatientActivity.class,hr,min);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
//this means reminder is added
}
public long getTimeInMillis(String date) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss a");
long millis;
Date d = sdf.parse(date);
millis= d.getTime();
Log.d("date , millis:",date+" "+millis);
return millis;
}
}