Application to send email

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/recipientET"
        android:inputType="textEmailAddress"
        android:hint="Recipient"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/subjectET"
        android:inputType="textEmailSubject"
        android:hint="Subject"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/contentET"
        android:hint="Content"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:id="@+id/sendEmail"
        android:text="Send Mail"/>

</LinearLayout>

package com.example.myapplication;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private EditText recipient, subject, content;
    private Button sendMail;

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

        recipient = findViewById(R.id.recipientET);
        subject = findViewById(R.id.subjectET);
        content = findViewById(R.id.contentET);
        sendMail = findViewById(R.id.sendEmail);

        sendMail.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.parse("mailto:" + recipient.getText().toString()));
                emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject.getText().toString());
                emailIntent.putExtra(Intent.EXTRA_TEXT, content.getText().toString());

                try {
                    startActivity(Intent.createChooser(emailIntent, "Send mail..."));
                } catch (android.content.ActivityNotFoundException ex) {
                    Toast.makeText(MainActivity.this, "There is no email client installed.", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}