This tutorial will help you in creating an android application to set alarm using TimePicker. This is a basic android tutorial which will make you familiar with Intents , Pending Intents and BroadcastReceiver.

Step 1: Create an android Project Name TimeActivity

Step 2: Create main the layout file activity_main.xml

Step 3:Set Button,TimePicker and TextView

Step 4:Then SetAlarm by creating the pending intent

Step 5:Create the BroadcastReceiver to recive and set the Ringtone

step 6: Set user permissions in manifest file

First create the layout file set buttons and textview..

then create the mainactivity .

Sample code::

 package com.example.timeactivity;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;

public class MainActivity extends Activity {

 TimePicker myTimePicker;
 Button buttonstartSetDialog;
 TextView textAlarmPrompt;

 TimePickerDialog timePickerDialog;

 final static int RQS_1 = 1;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startActivity(new Intent(MainActivity.this,Ringtones.class));

        textAlarmPrompt = (TextView)findViewById(R.id.alarmprompt);

        buttonstartSetDialog = (Button)findViewById(R.id.startSetDialog);
        buttonstartSetDialog.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    textAlarmPrompt.setText("");
    openTimePickerDialog(false);

   }});

    }


 private void openTimePickerDialog(boolean is24r){
  Calendar calendar = Calendar.getInstance();

  timePickerDialog = new TimePickerDialog(
    MainActivity.this, 
    onTimeSetListener, 
    calendar.get(Calendar.HOUR_OF_DAY), 
    calendar.get(Calendar.MINUTE), 
    is24r);
  timePickerDialog.setTitle("Set Alarm Time");  

  timePickerDialog.show();

 }

    OnTimeSetListener onTimeSetListener
    = new OnTimeSetListener(){

  @Override
  public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

   Calendar calNow = Calendar.getInstance();
   Calendar calSet = (Calendar) calNow.clone();

   calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
   calSet.set(Calendar.MINUTE, minute);
   calSet.set(Calendar.SECOND, 0);
   calSet.set(Calendar.MILLISECOND, 0);

   if(calSet.compareTo(calNow) <= 0){

    calSet.add(Calendar.DATE, 1);
   }

   setAlarm(calSet);
  }};

 private void setAlarm(Calendar targetCal){

  textAlarmPrompt.setText(
    "\n\n\n"
    + "AlarmSet  " + targetCal.getTime() + "\n"
    + "\n");

  Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
  AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
  alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);

 }

}

Then create the AlarmReceiver extending BroadcastReceiver.

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Vibrator;
import android.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent arg1) {
        Toast.makeText(context, "Alarm received!", Toast.LENGTH_LONG).show();

        Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
        Ringtone r = RingtoneManager.getRingtone(context, notification);
        r.play();

        Vibrator vibrator = (Vibrator)context 
                .getSystemService(Context.VIBRATOR_SERVICE);
        vibrator.vibrate(5000);
    }

}