changed weird activity switching to smooth fragment switching

ClimateGoApp/app/src/main/AndroidManifest.xml

@@ -16,17 +16,6 @@
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
-                <category android:name="android.intent.category.LAUNCHER" />
-            </intent-filter>
-        </activity>
-        <activity
-            android:name=".activities.DebugActivity"
-            android:exported="true"
-            android:theme="@style/Theme.ClimateGoApp.NoActionBar"
-            android:parentActivityName=".activities.HomeActivity">
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>

ClimateGoApp/app/src/main/java/de/cdaut/climategoapp/activities/ActivityUtils.java

@@ -1,44 +0,0 @@
-package de.cdaut.climategoapp.activities;
-
-import android.content.Intent;
-import android.view.MenuItem;
-
-import androidx.annotation.NonNull;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.drawerlayout.widget.DrawerLayout;
-
-import de.cdaut.climategoapp.R;
-
-public final class ActivityUtils {
-    private ActivityUtils() {
-        throw new IllegalAccessError("Utility Class");
-    }
-
-    public static boolean handleNavBarItemClicks(@NonNull MenuItem item,
-                                                 AppCompatActivity rootClass,
-                                                 DrawerLayout drawer) {
-
-        Class<? extends AppCompatActivity> targetActivityClass;
-
-        switch (item.getItemId()) {
-            case R.id.nav_main:
-                targetActivityClass = HomeActivity.class;
-                break;
-            case R.id.nav_debug:
-                targetActivityClass = DebugActivity.class;
-                break;
-            default:
-                throw new IllegalAccessError("Illegal activity met in nav drawer");
-        }
-
-        if (targetActivityClass.equals(rootClass.getClass())) {
-            drawer.closeDrawers();
-            return false;
-        }
-
-        Intent targetIntent = new Intent(rootClass, targetActivityClass);
-        rootClass.startActivity(targetIntent);
-
-        return false;
-    }
-}

ClimateGoApp/app/src/main/java/de/cdaut/climategoapp/activities/DebugActivity.java

@@ -1,103 +0,0 @@
-package de.cdaut.climategoapp.activities;
-
-import android.content.Intent;
-import android.os.Bundle;
-
-
-import androidx.annotation.NonNull;
-import androidx.appcompat.app.ActionBarDrawerToggle;
-import androidx.appcompat.app.AppCompatActivity;
-
-import androidx.drawerlayout.widget.DrawerLayout;
-import androidx.navigation.NavController;
-import androidx.navigation.Navigation;
-import androidx.navigation.ui.AppBarConfiguration;
-import androidx.navigation.ui.NavigationUI;
-
-import de.cdaut.climategoapp.R;
-import de.cdaut.climategoapp.databinding.ActivityDebugBinding;
-
-import android.view.Menu;
-import android.view.MenuItem;
-
-import com.google.android.material.navigation.NavigationView;
-
-public class DebugActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
-
-    private AppBarConfiguration appBarConfiguration;
-    private ActivityDebugBinding binding;
-    public DrawerLayout drawerLayout;
-    public ActionBarDrawerToggle actionBarDrawerToggle;
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
-        binding = ActivityDebugBinding.inflate(getLayoutInflater());
-        setContentView(binding.getRoot());
-
-        setSupportActionBar(binding.toolbar);
-
-
-        // drawer layout instance to toggle the menu icon to open
-        // drawer and back button to close drawer
-        drawerLayout = findViewById(R.id.debug_drawer_layout);
-        actionBarDrawerToggle = new ActionBarDrawerToggle(this,
-                drawerLayout,
-                R.string.nav_open,
-                R.string.nav_close);
-
-        // pass the Open and Close toggle for the drawer layout listener
-        // to toggle the button
-        drawerLayout.addDrawerListener(actionBarDrawerToggle);
-        actionBarDrawerToggle.syncState();
-
-        // to make the Navigation drawer icon always appear on the action bar
-        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
-
-        setNavigationViewListener();
-    }
-
-    @Override
-    public boolean onCreateOptionsMenu(Menu menu) {
-        // Inflate the menu; this adds items to the action bar if it is present.
-        getMenuInflater().inflate(R.menu.menu_main, menu);
-        return true;
-    }
-
-    @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
-        // Handle action bar item clicks here. The action bar will
-        // automatically handle clicks on the Home/Up button, so long
-        // as you specify a parent activity in AndroidManifest.xml.
-        int id = item.getItemId();
-
-        if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
-            return true;
-        }
-
-        //noinspection SimplifiableIfStatement
-        if (id == R.id.action_settings) {
-            return true;
-        }
-
-        return super.onOptionsItemSelected(item);
-    }
-
-    @Override
-    public boolean onSupportNavigateUp() {
-        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_nav);
-        return NavigationUI.navigateUp(navController, appBarConfiguration)
-                || super.onSupportNavigateUp();
-    }
-
-    @Override
-    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
-        return ActivityUtils.handleNavBarItemClicks(item, this, drawerLayout);
-    }
-
-    private void setNavigationViewListener() {
-        NavigationView navigationView = findViewById(R.id.nav_drawer);
-        navigationView.setNavigationItemSelectedListener(this);
-    }
-}

ClimateGoApp/app/src/main/java/de/cdaut/climategoapp/activities/HomeActivity.java

@@ -1,6 +1,5 @@
 package de.cdaut.climategoapp.activities;
 
-import android.content.Intent;
 import android.os.Bundle;
 
 
@@ -9,11 +8,14 @@ import androidx.appcompat.app.ActionBarDrawerToggle;
 import androidx.appcompat.app.AppCompatActivity;
 
 import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.fragment.app.Fragment;
 import androidx.navigation.NavController;
 import androidx.navigation.Navigation;
 import androidx.navigation.ui.AppBarConfiguration;
 import androidx.navigation.ui.NavigationUI;
 
+import de.cdaut.climategoapp.DebugFragment;
+import de.cdaut.climategoapp.HomeFragment;
 import de.cdaut.climategoapp.R;
 import de.cdaut.climategoapp.databinding.ActivityHomeBinding;
 
@@ -52,7 +54,13 @@ public class HomeActivity extends AppCompatActivity implements NavigationView.On
         actionBarDrawerToggle.syncState();
 
         // to make the Navigation drawer icon always appear on the action bar
-        getSupportActionBar(). setDisplayHomeAsUpEnabled(true);
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+
+        //add the Home Fragment to the Fragment container
+        this.getSupportFragmentManager()
+                .beginTransaction()
+                .replace(R.id.home_act_fragment_container, new HomeFragment())
+                .commit();
 
         setNavigationViewListener();
     }
@@ -93,7 +101,30 @@ public class HomeActivity extends AppCompatActivity implements NavigationView.On
 
     @Override
     public boolean onNavigationItemSelected(@NonNull MenuItem item) {
-        return ActivityUtils.handleNavBarItemClicks(item, this, drawerLayout);
+
+        Fragment targetFragment;
+
+        //determine which fragment to switch to
+        switch (item.getItemId()) {
+            case R.id.nav_main:
+                targetFragment = new HomeFragment();
+                break;
+            case R.id.nav_debug:
+                targetFragment = new DebugFragment();
+                break;
+            default:
+                throw new IllegalAccessError("Illegal activity met in nav drawer");
+        }
+
+        //switch to the appropriate Fragment
+        this.getSupportFragmentManager()
+                .beginTransaction()
+                .replace(R.id.home_act_fragment_container, targetFragment)
+                .commit();
+
+        //close the nav drawer after switching fragments
+        this.drawerLayout.closeDrawers();
+        return false;
     }
 
     private void setNavigationViewListener() {

ClimateGoApp/app/src/main/res/layout/activity_debug.xml

@@ -1,37 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/debug_drawer_layout"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".activities.HomeActivity"
-    tools:ignore="HardcodedText">
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical"
-        android:theme="@style/Theme.ClimateGoApp.AppBarOverlay">
-
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/toolbar"
-            android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            android:background="?attr/colorPrimary"
-            app:popupTheme="@style/Theme.ClimateGoApp.PopupOverlay" />
-
-        <include layout="@layout/fragment_debug" />
-    </LinearLayout>
-
-    <!--this the navigation view which draws
-    and shows the navigation drawer-->
-    <!--include the menu created in the menu folder-->
-    <com.google.android.material.navigation.NavigationView
-        android:id="@+id/nav_drawer"
-        android:layout_width="wrap_content"
-        android:layout_height="match_parent"
-        android:layout_gravity="start"
-        app:menu="@menu/navigation_menu" />
-
-</androidx.drawerlayout.widget.DrawerLayout>

ClimateGoApp/app/src/main/res/layout/activity_home.xml

@@ -21,7 +21,11 @@
             android:background="?attr/colorPrimary"
             app:popupTheme="@style/Theme.ClimateGoApp.PopupOverlay" />
 
-        <include layout="@layout/fragment_home" />
+        <FrameLayout
+            android:id="@+id/home_act_fragment_container"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent">
+        </FrameLayout>
     </LinearLayout>
 
     <!--this the navigation view which draws

ClimateGoApp/app/src/main/res/navigation/nav_graph.xml

@@ -3,21 +3,21 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/nav_graph"
-    app:startDestination="@id/HomeFragment">
+    app:startDestination="@id/home_fragment">
 
     <fragment
-        android:id="@+id/HomeFragment"
+        android:id="@+id/home_fragment"
         android:name="de.cdaut.climategoapp.HomeFragment"
         android:label="@string/first_fragment_label"
         tools:layout="@layout/fragment_home"/>
 
-    <fragment android:id="@+id/DebugFragment"
+    <fragment android:id="@+id/debug_fragment"
         android:name="de.cdaut.climategoapp.DebugFragment"
         android:label="@string/debug_fragment_label"
         tools:layout="@layout/fragment_debug">
         <action
             android:id="@+id/action_DebugFragment_to_HomeFragment"
-            app:destination="@id/HomeFragment" />
+            app:destination="@id/home_fragment" />
     </fragment>
 
 </navigation>