dadino

<android.support.design.widget.CoordinatorLayout
	android:id="@+id/main_content"
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<android.support.design.widget.AppBarLayout
		android:id="@+id/appbar"
		android:layout_width="match_parent"

dadino

<?xml version="1.0" encoding="utf-8"?>
<resources>

<!-- google's material design colours from 
http://www.google.com/design/spec/style/color.html#color-ui-color-palette -->
<!--reds-->
    <color name="md_red_50">#fffde0dc</color>
    <color name="md_red_100">#fff9bdbb</color>
    <color name="md_red_200">#fff69988</color>
    <color name="md_red_300">#fff36c60</color>

dadino

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;


public class FragmentUtils {
    public static void addFragmentsInActivity(Activity act,
                                              int containerId, Fragment fragment, String tag) {
        FragmentManager fm = act.getFragmentManager();