harshavardhan98

Setting up a callback interface when querying the DB:
https://stackoverflow.com/questions/42121771/handle-data-returned-by-an-async-task-firebase?rq=1 

harshavardhan98

lex programs repo - https://github.com/VandanaBaidya/Lex-Programs 
https://github.com/3ZadeSSG/Lex-Yacc-Basics/blob/master/Problem%20Statements%20Scanned%20Copy.pdf

harshavardhan98

//source:
//https://www.concretepage.com/android/android-alarm-clock-tutorial-to-schedule-and-cancel-alarmmanager-pendingintent-and-wakefulbroadcastreceiver-example

// permissions - add this in the manifest file
// <uses-permission android:name="android.permission.WAKE_LOCK"/>
//<receiver android:name=".AlarmReceiver"/> - add this to the manifest file 

alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent myIntent = new Intent(MainActivity.this, AlarmReceiver.class);
pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent, 0);

harshavardhan98

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

public class adapter_name extends ArrayAdapter<class_name> {

harshavardhan98

// assigning an onclick listener to a button

// declare a Button b1 above outside the onCreate

// assigns a button with id 'btn1' in the xml layout file to the variable b1
b1=findViewById(R.id.btn1);

// assigning an onClickListener to the Button b1
b1.setOnClickListener(new View.OnClickListener() {
    @Override