How To Crete An Alarm Clock Android App

Aim:

To develop a Android Application that creates Alarm Clock.

Procedure:

Creating a New project:

Open Android Studio and then click onFile -> New -> New project.

new project

Then type the Application name as "ex.no.11″ and clickNext.

application-name-11

Then select theMinimum SDK as shown below and clickNext.

minimum sdk

Then select theEmpty Activityand clickNext.

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 AlarmReceiverand click Finish button.

AlarmActivity

Thus Second Activity For the application is created.

Designing layout for the Android Application:

Click onapp -> res -> layout -> activity_main.xml.

activity_main

Now click onText 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 onDesign 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 onapp -> 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();     } }