Simple Alarm Application in Android Studio

Chhavi Goel
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Introduction

In today's article we will make our own Alarm clock. You will be able to hear the alarm sound after 15 seconds and the application will end on click of a button.

Step 1:

Open "activity_main.xml" and add the following code to it: (Inside LinearLayout element)

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/hello_world"

android:textSize="30dp"/>

The layout looks like:

Step 2:

Right click on layout-> New-> Layout resource file. Name this file as "alarm_layout". This file is to display a button to stop the alarm. Add the following code to this file:

<Button

android:id="@+id/alarm"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Stop"

android:layout_marginTop="200dp"

android:layout_marginLeft="140dp"

android:background="@drawable/button_lay"/>

The layout looks like:

Step 3:

Make a new layout file and name it as "bye_layout". Add the following code to it: (Inside LinearLayout element)

<TextView

android:text="Thanxx for visiting the Alarm clock..."

android:layout_height="wrap_content"

android:layout_width="fill_parent"

android:textSize="30dp"

android:layout_marginTop="180dp"

android:textColor="#FFFFFF"

android:paddingLeft="20dp"

android:paddingRight="20dp"/>

The layout looks like:

Step 4:

Open "MainActivity.java" and add the following code to it:

package com.alarmclock;

import android.app.AlarmManager;

import android.app.PendingIntent;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.Window;

import android.widget.Button;

import java.util.Calendar;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

Calendar t = Calendar.getInstance();

t.add(Calendar.SECOND, 15);

Intent i = new Intent(this, AlarmSound.class);

PendingIntent pending = PendingIntent.getActivity(this,1235, i, PendingIntent.FLAG_CANCEL_CURRENT);

AlarmManager alarm = (AlarmManager)getSystemService(Activity.ALARM_SERVICE);

alarm.set(AlarmManager.RTC_WAKEUP, t.getTimeInMillis(),pending);

//startActivity(intent);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

In the above code activity "AlarmC" class will be called after 15 seconds. "PendingIntent.FLAG_CANCEL_CURRENT" ensures that after 15 seconds the current activity will be cancelled and the new activity ie "AlarmSound" is started. "AlarmManager" allows the access to system alarm services. This class allows you to schedule your application to run at some time in future.

Step 5:

Right click on the package-> New-> Java class. Name this class as "AlarmSound" and add the following code to it:

package com.alarmclock;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.media.AudioManager;

import android.media.MediaPlayer;

import android.media.RingtoneManager;

import android.net.Uri;

import android.os.Bundle;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

import android.view.Window;

import android.view.WindowManager;

import android.widget.Button;

import java.io.IOException;

public class AlarmSound extends Activity {

private MediaPlayer player;

final Context context=this;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.alarm_layout);

Button stop = (Button) findViewById(R.id.alarm);

stop.setOnTouchListener(new View.OnTouchListener() {

public boolean onTouch(View arg0, MotionEvent arg1) {

player.stop();

Intent i=new Intent(context,Bye.class);

startActivity(i);

return false;

}

});

play(this, getAlarmSound());

}

private void play(Context context, Uri alert) {

player = new MediaPlayer();

try {

player.setDataSource(context, alert);

final AudioManager audio = (AudioManager) context

.getSystemService(Context.AUDIO_SERVICE);

if (audio.getStreamVolume(AudioManager.STREAM_ALARM) != 0) {

player.setAudioStreamType(AudioManager.STREAM_ALARM);

player.prepare();

player.start();

}

} catch (IOException e) {

Log.e("Error....","Check code...");

}

private Uri getAlarmSound() {

Uri alertSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);

if (alertSound == null) {

alertSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

if (alertSound == null) {

alertSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);

}

return alertSound;

}

"getAlarmSound()" returns the alarm sound set in the device. If the alarm tone is not set, default tone will be returned. "play()" will start the Media Player that plays the sound. Also if "stop" button is clicked, a new activity called "bye" will be called and this will end our application.

Step 6:

Create a new Java class and name it as "Bye". Add the following code to it:

package com.alarmclock;

import android.app.Activity;

import android.os.Bundle;

public class Bye extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.bye_layout);

}

Step 7:

Finally, make the following changes in "AndroidManifest.xml"

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.alarmclock"

android:versionCode="1"

android:versionName="1.0" >

<uses-permission android:name="android.permission.INTERNET" />

<uses-sdk

android:minSdkVersion="7"

android:targetSdkVersion="16" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme"

android:debuggable="true">

<activity

android:name="com.alarmclock.MainActivity"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

<activity

android:name="com.alarmclock.AlarmSound"

android:label="@string/app_name" >

</activity>

<activity

android:name=".Bye"

android:label="Byee"/>

</application>

</manifest>

Note that we have added the internet permission.

Step 8:

This application will not run on the emulator because emulator does not consists of the ringtones. Even if you will try the project on emulator you will not be able to hear the sound. So its better to run the application on a device.

To run the application on an android phone, install the "apk" of the application on your device. "apk" of you application is present in "Build"-> "Apk". To install the apk, mail the mail to your gmail account. Go to settings in your phone-> Security->Allow non-market apps. If you then access your account from the native Gmail app on the phone it will recognize that the attachment is an app and offers an "Install" button. Install the app. After the installation completes, Run the application.

The output snapshots: