Android Phone Call Tutorial

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1- Android Phone Call

In Android, it is simple for you to make a phone call from your application by creating an implicit Intent, ACTION_CALL, and then dispatching to the system in order to request to launch the calling application available in the system.
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" + phoneNumber));

startActivity(callIntent);
Example preview:
On Android Studio create a project:
  • File > New > New Project > Empty Activity
    • Name: PhoneCallExample
    • Package name: org.o7planning.phonecallexample
    • Language: Java
Your application needs permission to place phone calls, so it requires the following code to be added to the  AndroidManifest.xml file:

<uses-permission android:name="android.permission.CALL_PHONE" />
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.phonecallexample">

    <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>
In addition, from  Android 6.0 (API Level 23) onwards, an application wants to make a call, it must be given permission by the user. Thus, you need to have some additional processing actions in the application (See in the example code).
The interface of the application is shown below:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">


    <EditText
        android:id="@+id/editText_phoneNumber"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:gravity="center"
        android:inputType="phone"
        android:text="+15555219999"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button_call"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Call by Intent.ACTION_CALL"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_phoneNumber" />

</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.phonecallexample;


import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final int MY_PERMISSION_REQUEST_CODE_CALL_PHONE = 555;

    private static final String LOG_TAG = "AndroidExample";

    private EditText editTextPhoneNumber;
    private Button buttonCall;

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

        this.editTextPhoneNumber = (EditText) this.findViewById(R.id.editText_phoneNumber);
        this.buttonCall = (Button) this.findViewById(R.id.button_call);

        this.buttonCall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                askPermissionAndCall();
            }
        });
    }

    private void askPermissionAndCall() {

        // With Android Level >= 23, you have to ask the user
        // for permission to Call.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) { // 23

            // Check if we have Call permission
            int sendSmsPermisson = ActivityCompat.checkSelfPermission(this,
                    Manifest.permission.CALL_PHONE);

            if (sendSmsPermisson != PackageManager.PERMISSION_GRANTED) {
                // If don't have permission so prompt the user.
                this.requestPermissions(
                        new String[]{Manifest.permission.CALL_PHONE},
                        MY_PERMISSION_REQUEST_CODE_CALL_PHONE
                );
                return;
            }
        }
        this.callNow();
    }

    @SuppressLint("MissingPermission")
    private void callNow() {
        String phoneNumber = this.editTextPhoneNumber.getText().toString();

        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:" + phoneNumber));
        try {
            this.startActivity(callIntent);
        } catch (Exception ex) {
            Toast.makeText(getApplicationContext(),"Your call failed... " + ex.getMessage(),
                    Toast.LENGTH_LONG).show();
            ex.printStackTrace();
        }
    }


    // When you have the request results
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //
        switch (requestCode) {
            case MY_PERMISSION_REQUEST_CODE_CALL_PHONE: {

                // Note: If request is cancelled, the result arrays are empty.
                // Permissions granted (CALL_PHONE).
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    Log.i( LOG_TAG,"Permission granted!");
                    Toast.makeText(this, "Permission granted!", Toast.LENGTH_LONG).show();

                    this.callNow();
                }
                // Cancelled or denied.
                else {
                    Log.i( LOG_TAG,"Permission denied!");
                    Toast.makeText(this, "Permission denied!", Toast.LENGTH_LONG).show();
                }
                break;
            }
        }
    }

    // When results returned
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == MY_PERMISSION_REQUEST_CODE_CALL_PHONE) {
            if (resultCode == RESULT_OK) {
                // Do something with data (Result returned).
                Toast.makeText(this, "Action OK", Toast.LENGTH_LONG).show();
            } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Action Cancelled", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Action Failed", Toast.LENGTH_LONG).show();
            }
        }
    }
}

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