Android Firebase read ArrayList object from database

Question

When I uploaded an ArrayList of objects in my firebase database with setValue,

It was stored this way:database screenshot

And now I'm wondering if I could retrieve this ArrayList from the database to use the information in it to populate a listview.

public class Alarm {

    private String alarm_time;
    private String alarm_ampm;
    private String alarm_days;

    public void setAlarm_time(String time) {
        alarm_time = time;
    }

    public void setAlarm_ampm(String ampm) {
        alarm_ampm = ampm;
    }

    public void setAlarm_days(String days) {
        alarm_days = days;
    }

    public String getTime() {
        return this.alarm_time;
    }

    public String getAmpm() {
        return this.alarm_ampm;
    }

    public String getDays() {
        return this.alarm_days;
    }
}

This is what an Alarm looks like, and the Alarms are stored in the ArrayList that I uploaded to the database.

Is there a way to retrieve an ArrayList directly from firebase database? Or is there any library that might help me out?

akhilesh0707 · Accepted Answer · 2017-07-24 06:09:35Z

1

Try this

private void getAlarmLlist() {
        final List<Alarm> alarmList=new ArrayList();
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference().child("alarm_list");
        databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                try {
                    for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                        Alarm alarm= postSnapshot.getValue(Alarm.class);
                        alarmList.add(alarm);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Log.w(TAG, "Error: ", databaseError.toException());
            }
        });
    }

answered Jul 24, 2017 at 6:09

akhilesh0707

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1 Comment

Andy K Over a year ago

Thank you so much!

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