MainActivity.java

package com.project.rama.sendemail;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private EditText ToEmail = null;
    private EditText EmailSubject = null;
    private EditText EmailMessage = null;

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_clear:
                ToEmail.setText("");
                EmailSubject.setText("");
                EmailMessage.setText("");
                break;
            case R.id.menu_send:
                String to = ToEmail.getText().toString();
                String subject = EmailSubject.getText().toString();
                String message = EmailMessage.getText().toString();

                Intent email = new Intent(Intent.ACTION_SEND);
                email.putExtra(Intent.EXTRA_EMAIL, new String[]{(to)});
                email.putExtra(Intent.EXTRA_SUBJECT, subject);
                email.putExtra(Intent.EXTRA_TEXT, message);

                // need this to prompts email client only
                email.setType("message/rfc822");
                startActivity(Intent.createChooser(email, "Choose an Email client"));
                break;

        }
        return true;
    }

    private void Deklarasi() {
        ToEmail = (EditText) findViewById(R.id.EdMail);
        EmailSubject = (EditText) findViewById(R.id.EdSubject);
        EmailMessage = (EditText) findViewById(R.id.EdMessage);
    }
}