Added Home/Settings/About Fragment and adjust navigation

app/src/main/java/net/xcreen/restsms/AboutFragment.java

@@ -0,0 +1,21 @@
+package net.xcreen.restsms;
+
+import androidx.fragment.app.Fragment;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+public class AboutFragment extends Fragment {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_about, container, false);
+    }
+}

app/src/main/java/net/xcreen/restsms/HomeFragment.java

@@ -0,0 +1,21 @@
+package net.xcreen.restsms;
+
+import androidx.fragment.app.Fragment;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+public class HomeFragment extends Fragment {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_home, container, false);
+    }
+}

app/src/main/java/net/xcreen/restsms/MainActivity.java

@@ -7,6 +7,9 @@ import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.appcompat.app.ActionBarDrawerToggle;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentTransaction;
+
 import android.view.MenuItem;
 
 public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
@@ -31,6 +34,15 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 
         navigationView = findViewById(R.id.nav_view);
         navigationView.setNavigationItemSelectedListener(this);
+
+        //Set Home Fragment
+        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
+        try {
+            Fragment homeFragment = HomeFragment.class.newInstance();
+            fragmentTransaction.replace(R.id.main_framelayout, homeFragment).commit();
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
     }
 
     @Override
@@ -45,24 +57,25 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
     @SuppressWarnings("StatementWithEmptyBody")
     @Override
     public boolean onNavigationItemSelected(MenuItem item) {
-        // Handle navigation view item clicks here.
-        int id = item.getItemId();
-
-        /*
-        if (id == R.id.nav_camera) {
-            // Handle the camera action
-        } else if (id == R.id.nav_gallery) {
-
-        } else if (id == R.id.nav_slideshow) {
-
-        } else if (id == R.id.nav_manage) {
-
-        } else if (id == R.id.nav_share) {
-
-        } else if (id == R.id.nav_send) {
+        //Set new Fragment
+        Fragment fragment;
+        switch(item.getItemId()){
+            case R.id.nav_home:
+                fragment = new HomeFragment();
+                break;
+            case R.id.nav_settings:
+                fragment = new SettingsFragment();
+                break;
+            case R.id.nav_about:
+                fragment = new AboutFragment();
+                break;
+            default:
+                fragment = new HomeFragment();
+                break;
         }
-        */
-
+        //Replace Fragment
+        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
+        fragmentTransaction.replace(R.id.main_framelayout, fragment).addToBackStack("fragBack").commit();
         drawerLayout.closeDrawer(GravityCompat.START);
         return true;
     }

app/src/main/java/net/xcreen/restsms/SettingsFragment.java

@@ -0,0 +1,21 @@
+package net.xcreen.restsms;
+
+import androidx.fragment.app.Fragment;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+public class SettingsFragment extends Fragment {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_settings, container, false);
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -38,7 +38,8 @@
             <FrameLayout
                 android:id="@+id/main_framelayout"
                 android:layout_width="match_parent"
-                android:layout_height="match_parent" />
+                android:layout_height="match_parent"
+                android:padding="@dimen/fragment_padding"/>
 
         </LinearLayout>
 

app/src/main/res/layout/fragment_about.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout 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=".AboutFragment">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="ABOUT" />
+
+</FrameLayout>

app/src/main/res/layout/fragment_home.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout 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=".HomeFragment">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="Hello Home" />
+
+</FrameLayout>

app/src/main/res/layout/fragment_settings.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout 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=".SettingsFragment">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="SETTINGS" />
+
+</FrameLayout>

app/src/main/res/values/dimens.xml

@@ -1,8 +1,7 @@
 <resources>
-    <!-- Default screen margins, per the Android Design guidelines. -->
     <dimen name="activity_horizontal_margin">16dp</dimen>
     <dimen name="activity_vertical_margin">16dp</dimen>
     <dimen name="nav_header_vertical_spacing">8dp</dimen>
     <dimen name="nav_header_height">176dp</dimen>
-    <dimen name="fab_margin">16dp</dimen>
+    <dimen name="fragment_padding">20dp</dimen>
 </resources>