Sendmail Java - Android Studio

Question

Good morning, I’m developing an application, where I have the following doubts. I intend to email a form using Intent’s. The Code is apparently all OK, but when you click on the button "Send" the program does nothing. Please, I’d like you to help me. Below is the Java and XML code.:

JAVA

package pt.penafielverde.serpeagu.serpaguv110.agu;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
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 enviarmail extends AppCompatActivity {
    Button enviar = findViewById(R.id.enviar);
    final EditText assunto = findViewById(R.id.assunto);
    EditText operador = findViewById(R.id.operador);
    final EditText corpoemail = findViewById(R.id.corpoemail);
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_enviar_email);
        enviar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendMail();
                assunto.setText("");
                operador.setText("");
                corpoemail.setText("");
            }
            private void sendMail() {
                String recipientList = "[email protected]";
                String[] recipients = recipientList.split(",");
                String subject = assunto.getText().toString();
                String message = corpoemail.getText().toString();
                Intent intent = new Intent(Intent.ACTION_SEND);
                intent.putExtra(Intent.EXTRA_EMAIL, recipients);
                intent.putExtra(Intent.EXTRA_SUBJECT, subject);
                intent.putExtra(Intent.EXTRA_TEXT, message + "Mensagem enviada por," + operador);
                intent.setType("message/rfc822");
                startActivity(Intent.createChooser(intent, "Escolha o cliente email, por onde deseja enviar a mensagem :"));
            }
            ;
        });
    }
}

XML

<?xml version="1.0" encoding="utf-8"?>
<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="pt.penafielverde.serpeagu.serpaguv110.agu.enviarmail">

    <TextView
        android:id="@+id/textView10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="66dp"
        android:layout_marginTop="51dp"
        android:text="Operador.:" />

    <TextView
        android:id="@+id/textView11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="14dp"
        android:text="COMUNICAÇÃO "
        android:textColor="@android:color/holo_green_light"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/assunto_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/textView10"
        android:layout_alignParentTop="true"
        android:layout_marginTop="81dp"
        android:text="Assunto.:" />

    <EditText
        android:id="@+id/operador"
        android:layout_width="wrap_content"
        android:layout_height="36dp"
        android:layout_alignBaseline="@+id/textView10"
        android:layout_toEndOf="@+id/textView10"
        android:ems="10"
        android:inputType="textPersonName"
        android:textSize="12sp" />

    <EditText
        android:id="@+id/assunto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView10"
        android:layout_toEndOf="@+id/textView10"
        android:ems="10"
        android:inputType="textPersonName"
        android:textSize="12sp" />

    <EditText
        android:id="@+id/corpoemail"
        android:layout_width="334dp"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="154dp"
        android:ems="10"
        android:inputType="textMultiLine" />

    <TextView
        android:id="@+id/textView13"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/corpoemail"
        android:layout_alignStart="@+id/corpoemail"
        android:layout_marginBottom="-154dp"
        android:text="Descrição da Anómalia" />

    <Button
        android:id="@+id/enviar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="17dp"
        android:text="enviar" />
</RelativeLayout>

Answer 1

Add one (mailto: Uri) right after the creation of Intent

intent.setData(Uri.parse("mailto"));