Create Instant Alarm Android App Using Android Studio

Introduction

 

In this article, I will show you how to create an Instant Alarm Android App using an Android studio.

 

Requirements

• Android Studio version 2.3.3
• Little bit XML and JAVA knowledge.
• Android Emulator (or) Android mobile
• Download link (Android Studio)

Steps should be followed

 

Follow these steps to create an instant Alarm Android app. I have included the source code below.

 

Step 1

 

Open Android Studio and start a new Android Studio Project.

 

 

Step 2

 

You can choose your application name and choose where your project is stored. If you wish to use C++ for coding the project, mark the "Include C++ support", and click the "Next" button.

 

 

Step 3

 

Now, select the version of Android and select the target Android devices. We need to choose the SDK level which plays an important role to run the application.

 

 

Step 4

 

Now, add the activity and click the "Next" button.

 

 

Step 5

 

Add Activity name and click "Finish".

 

 

Step 6

 

Go to activity_main.xml. This XML file contains the designing code for the Android app. 

 

 

The XML code is given below.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="28dp"
        android:ems="10"
        android:hint="Number of minutes"
        android:inputType="numberDecimal" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/time"
        android:layout_below="@+id/time"
        android:layout_marginRight="60dp"
        android:layout_marginTop="120dp"
        android:text="Start" />

</RelativeLayout>

Step 7

 

Create a new java class file. Go to (Java ⇒ new ⇒Java class file).

 

 

Add the below code.

package abu.alarm;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.Toast;

public class MyBroadcastReceiver extends BroadcastReceiver {
    MediaPlayer mp;
    @Override
    public void onReceive(Context context, Intent intent) {
        mp=MediaPlayer.create(context, R.raw.alrm   );
        mp.start();
        Toast.makeText(context, "Alarm....", Toast.LENGTH_LONG).show();
    }
}

Step 8

 

Add Music in the Res folder. The below template shows how to add the image file. Go to the app and right-click. The “Show in Explorer” option  will appear. Click on the path and add the image in the main folder.

 

 

Create a new folder, name it as “Raw”, and add the music (mp3) file.

 

 

Step 9

 

We need to make Vibrate requests, so add Vibrate permission in AndroidManifest.xml.

 

 

The AndroidManifest.xml code is given below.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="abu.alarm">
 <uses-permission android:name="android.permission.VIBRATE" />
    <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            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="MyBroadcastReceiver" >
            </receiver>
        </application>
</manifest>

Step 10

 

Go to Main Activity.java. This Java program is the backend language for Android.

 

 

The Java code is given below.

package abu.alarm;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
 Button b1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  b1 = (Button) findViewById(R.id.button1);

  b1.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    startAlert();
   }
  });

 }
 public void startAlert() {
  EditText text = (EditText) findViewById(R.id.time);
  int i = Integer.parseInt(text.getText().toString());
  Intent intent = new Intent(this, MyBroadcastReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(
   this.getApplicationContext(), 234324243, intent, 0);
  AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
  alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() +
   (i * 1000), pendingIntent);
  Toast.makeText(this, "Alarm set in " + i + " seconds", Toast.LENGTH_LONG).show();
 }

}

Step 11

 

Now, go to the menu bar and click "Make Project" or press ctrl+f9 to debug the error.

 

 

Step 12

 

Then, click the Run button or press shift+f10 to run the project. And choose the virtual machine and click OK.

 

 

Conclusion

 

We have successfully created an Instant Alarm Android application using Android Studio.