Android Application that creates Alarm Clock

Aim:

        To develop a Android Application that creates Alarm Clock.

Procedure:

Creating a New project:

  • Open Android Studio and then click on File -> New -> New project.

new project

  • Then type the Application name as “ex.no.11″ and click Next. 

application-name-11

  • Then select the Minimum SDK as shown below and click Next.

minimum sdk

  • Then select the Empty Activity and click Next. 

empty activity

  • Finally click Finish.

finish

  • It will take some time to build and load the project.
  • After completion it will look as given below.

new

Creating Second Activity for the Android Application:

  • Click on File -> New -> Activity -> Empty Activity.

New activity

  • Type the Activity Name as AlarmReceiver and click Finish button.

AlarmActivity

  • Thus Second Activity For the application is created.

Designing layout for the Android Application:

  • Click on app -> res -> layout -> activity_main.xml.

activity_main

  • Now click on Text as shown below.

text

  • Then delete the code which is there and type the code as given below.

Code for Activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

    <ToggleButton
        android:id="@+id/toggleButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="20dp"
        android:checked="false"
        android:onClick="OnToggleClicked" />

</LinearLayout>
  • Now click on Design and your application will look as given below.

design-11

  • So now the designing part is completed.

Changes in Manifest for the Android Application:

  • Click on app -> manifests -> AndroidManifest.xml

manifest-11-a

  • Now change the activity tag to receiver tag in the AndroidManifest.xml file as shown below

manifest-11

Code for AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.exno11" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".AlarmReceiver" >
        </receiver>
    </application>

</manifest>
  • So now the changes are done in the Manifest.

Java Coding for the Android Application:

Java Coding for Main Activity:

  • Click on app -> java -> com.example.exno11 -> MainActivity.

MainActivity

  • Then delete the code which is there and type the code as given below.

Code for MainActivity.java:

package com.example.exno11;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TimePicker;
import android.widget.Toast;
import android.widget.ToggleButton;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity
{
    TimePicker alarmTimePicker;
    PendingIntent pendingIntent;
    AlarmManager alarmManager;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        alarmTimePicker = (TimePicker) findViewById(R.id.timePicker);
        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    }
    public void OnToggleClicked(View view)
    {
        long time;
        if (((ToggleButton) view).isChecked())
        {
            Toast.makeText(MainActivity.this, "ALARM ON", Toast.LENGTH_SHORT).show();
            Calendar calendar = Calendar.getInstance();
            calendar.set(Calendar.HOUR_OF_DAY, alarmTimePicker.getCurrentHour());
            calendar.set(Calendar.MINUTE, alarmTimePicker.getCurrentMinute());
            Intent intent = new Intent(this, AlarmReceiver.class);
            pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

            time=(calendar.getTimeInMillis()-(calendar.getTimeInMillis()%60000));
            if(System.currentTimeMillis()>time)
            {
                if (calendar.AM_PM == 0)
                    time = time + (1000*60*60*12);
                else
                    time = time + (1000*60*60*24);
            }
            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, time, 10000, pendingIntent);
        }
        else
        {
            alarmManager.cancel(pendingIntent);
            Toast.makeText(MainActivity.this, "ALARM OFF", Toast.LENGTH_SHORT).show();
        }
    }
}
  • So now the Coding part of Main Activity is completed.

Java Coding for Alarm Receiver:

  • Click on app -> java -> com.example.exno11 -> AlarmReceiver.

AlarmActivity-java

  • Then delete the code which is there and type the code as given below.

Code for AlarmReceiver.java:

package com.example.exno11;

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.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver 
{
    @Override
    public void onReceive(Context context, Intent intent) 
    {
        Toast.makeText(context, "Alarm! Wake up! Wake up!", Toast.LENGTH_LONG).show();
        Uri alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
        if (alarmUri == null)
        {
            alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        }
        Ringtone ringtone = RingtoneManager.getRingtone(context, alarmUri);
        ringtone.play();
    }
}
  • So now the Coding part of Alarm Receiver is also completed.
  • Now run the application to see the output.

Output:

android application      Screenshot_2016-04-25-23-36-43

Screenshot_2016-04-25-23-37-02      Screenshot_2016-04-25-23-37-09

Result:

              Thus Android Application that creates Alarm Clock is developed and executed successfully.

 

15 Responses

  1. Camp says:

    NICE ONE SIR

  2. negar says:

    tnxxxxxxxxxxxxxxxxxxxxxxxxxx <3

  3. khubab says:

    very well, better understanding

  4. Anu G says:

    thank u for u r information

  5. USAMA JAHANGIR says:

    very nice work. thank you……….

  6. anon says:

    Bless, this actually works!

  7. sonu says:

    really great

  8. udhayapriya says:

    its really super and its helpful to developers

  9. df says:

    it is very simple and useful

  10. Abhinav says:

    Awesome Thank you so much

  11. Md. Rejaul Karim says:

    You saved my life brother 😀

  12. ivereson says:

    thank you

  13. Dhaval says:

    Hi Devang,

    Really Helpful Code.. Its working good with my project.

    Thanks

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