Morgazmo

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files

Morgazmo

    public static MyViewModel obtainViewModel(FragmentActivity activity) {

        Log.d(TAG, "obtainViewModel");

        // Use a Factory to inject dependencies into the ViewModel
        ViewModelFactory factory = ViewModelFactory.getInstance(activity.getApplication());

        return ViewModelProviders.of(activity, factory).get(MyViewModel.class);

Morgazmo

    @NonNull
    private MyFragment findOrCreateViewFragment() {

        MyFragment myFragment = (MyFragment) getSupportFragmentManager().findFragmentById(R.id.contentFrame);

        if (myFragment == null) {

            Log.d(TAG, "createFragment");

Morgazmo

package xxx.xxxx.xxxxx;


import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;