Phone call android App

In this example we will see how to make a phone call using an Intent object in the android to invoke the default phone calls feature. In order to track changes in some telephony states on the device, we can use PhoneStateListener and TelephonyManager classes.

Syntax to display Toast

Intent i = new Intent(Intent.ACTION_CALL);
i.setData(Uri.parse("tel:"+number));
startActivity(i); 

Add permission

 // Below permission is required to make calls in android
 
 if (ActivityCompat.checkSelfPermission(MainActivity.this,
       Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
         return;
       } 

MainActivity.java

// MainActivity.java
package com.techstackguru.phone;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText getNo;
    Button callNo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getNo=(EditText)findViewById(R.id.mobileNo);
        callNo=(Button)findViewById(R.id.btCall);

        callNo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String number=getNo.getText().toString();
                Intent i = new Intent(Intent.ACTION_CALL);
                i.setData(Uri.parse("tel:"+number));

                if (ActivityCompat.checkSelfPermission(MainActivity.this,
                        Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }

                startActivity(i);
            }
        });
    }
}

In activity_main.xml file we are adding EditText and Button to enter phone number and to make call.

activity_main.xml

// 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"
    android:gravity="center">

    <EditText
        android:id="@+id/mobileNo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:hint="Enter Number"
        android:inputType="phone"
        android:maxLength="10" />

    <Button
        android:id="@+id/btCall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"
        android:p="Make Call" />

</LinearLayout>

AndroidManifest.xml

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

Output