如何将数据添加到 Firebase 数据库？

Question

I cannot add any data on the Firebase Realtime Database. Database connections are ok but I cannot add any data. When I click to button, add to data on my database.

MainActivity.java - codes

        private FirebaseDatabase database;
        private DatabaseReference dbRef;
        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String plan,note,date,time,remb,eventId;
                plan = etplan.getText().toString();
                note = etnote.getText().toString();
                date = etdate.getText().toString();
                time = ettime.getText().toString();

                if (remember.isChecked()==true){
                    remb= "true";
                }
                else{
                    remb = "false";
                }
                database = FirebaseDatabase.getInstance();
                dbRef = database.getReference("events");
                eventId = dbRef.push().getKey();
                event = new Events(plan,note,date,time,remb);
                dbRef.child(eventId).setValue(event);

                Toast.makeText(MainActivity.this,"Events Added SUCCESSFULLY!", Toast.LENGTH_SHORT).show();
            }
        });

Events.java - codes

public class Events {
    String plan;
    String note;
    String date;
    String time;
    String remb;

    public Events(){

    }

    public Events(String plan, String note, String date, String time, String remb){
        this.plan=plan;
        this.note=note;
        this.date=date;
        this.time=time;
        this.remb=remb;
    }
}

I am getting the following error in run : at com.cdirect.agenda.MainActivity$4.onClick(MainActivity.java:118)

this code:

dbRef.child(eventId).setValue(event);

and before this code of eventID (is String)

eventId = dbRef.push().getKey().toString();

Answer 1

What you can do is to add a listener to setValue(event) method like this:

dbRef.child(eventId).setValue(event)
     .addOnCompleteListener { task ->
            if(task.isSuccessful) {
                 Toast.makeText(this, "Successful", Toast.LENGTH_SHORT).show()
                 } else {
                 Toast.makeText(this, task.getException().getMessage(),
                         Toast.LENGTH_SHORT).show();
                }
      }

Now task.getException().getMessage() will let you know what the actual problem is about saving your event data.

Also, don't forget to check the database rules that read and write is set to true .