MainActivity.java

import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

        // open gmail through intent
        openGmail(new String[]{"infojkasdkad@gmail.com", "hassfajsf@gmail.com"}, "Type Subject", "This is email body");

    }

    private void openGmail(String[] emailIds, String subject, String body) {

        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.putExtra(Intent.EXTRA_EMAIL, emailIds);
        intent.putExtra(Intent.EXTRA_SUBJECT, subject);
        intent.putExtra(Intent.EXTRA_TEXT, body);
        intent.setType("message/rfc822");
        intent.setPackage("com.google.android.gm");
        startActivity(intent);
    }