How To Create A Calling Application In Android Using Android Studio

Introduction

Android is one of the most popular operating systems for mobile. In this article, I will show you how to create a Calling Application in Android Using 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 to be followed

Follow these steps to create a Calling Application in Android Using Android Studio. I have included the source code in the attachment.

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 on the location. If you wish to use C++ for coding the project, mark the "Include C++ support", and click "Next" button.



Now, select the version of Android and select the target Android devices.

Step 3

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



Add activity name and click "Finish".

Step 4

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



The XML code is given below.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    tools:context="abu.call.MainActivity" >
 <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">


    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Dial No." />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginLeft="44dp"
        android:layout_marginTop="84dp"
        android:text="Call" />
    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginLeft="18dp"
        android:ems="10" >
        <requestFocus />
    </EditText>
</RelativeLayout>
</android.support.constraint.ConstraintLayout>

Step 5

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



The Java code is given below

package abu.call;

import android.Manifest;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.app.ActivityCompat;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity
{
    EditText et;
    Button call_btn;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et=(EditText)findViewById(R.id.editText1);
        call_btn=(Button)findViewById(R.id.button1);
        call_btn.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                // TODO Auto-generated method stub
                Intent i = new Intent(Intent.ACTION_CALL);
                i.setData(Uri.parse("tel:"+et.getText().toString()));
                startActivity(i);
            }
        });
    }
}

Step 6

We need to make call requests, so add call permissions 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.call">

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

</manifest>

Step 7

Now, go to menu bar and click "Make Project" or press ctrl+f9 so as to debug it from errors.



Step 8

Then, click "Run" button or press shift+f10 to run the project. Choose the "virtual machine" option and click OK.

Conclusion

We have successfully created a Calling application in Android using Android Studio.