feat: Refactor shortcuts screens to use a single activity

This commit refactors the shortcuts feature by replacing multiple individual activity classes for each shortcut category with a single, generic `ShortcutsCategoryActivity`. This new activity dynamically loads the appropriate layout and sets the title based on intent extras, significantly reducing boilerplate code.

- A new `ShortcutsCategoryActivity` is introduced to display different shortcut categories.
- The `ShortcutsActivity` now uses preference click listeners to launch `ShortcutsCategoryActivity` with the correct layout and title resource IDs.
- Removed seven separate activity classes and their corresponding manifest entries, consolidating the logic into the new generic activity.
- The `EdgeToEdgeHelper` is updated to correctly apply system bar colors based on the current theme.

Author: Mihai-Cristian Condrea

app/src/main/AndroidManifest.xml

@@ -197,45 +197,15 @@
             android:label="@string/shortcuts"
             android:parentActivityName=".ui.screens.main.MainActivity" />
         <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.CodeShortcutsActivity"
+            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.ShortcutsCategoryActivity"
             android:exported="false"
-            android:label="@string/writing_code"
-            android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
-        <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.GeneralShortcutsActivity"
-            android:exported="false"
-            android:label="@string/general"
-            android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
-        <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.RefactoringShortcutsActivity"
-            android:exported="false"
-            android:label="@string/refactoring"
-            android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
-        <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.BuildShortcutsActivity"
-            android:exported="false"
-            android:label="@string/build_and_run"
+            android:label="@string/shortcuts"
             android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
         <activity
             android:name=".ui.screens.android.lessons.clocks.chronometer.ChronometerActivity"
             android:exported="false"
             android:label="@string/chronometer"
             android:parentActivityName=".ui.screens.main.MainActivity" />
-        <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.DebuggingShortcutsActivity"
-            android:exported="false"
-            android:label="@string/debugging"
-            android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
-        <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.NavigationAndSearchingShortcutsActivity"
-            android:exported="false"
-            android:label="@string/navigation_and_searching"
-            android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
-        <activity
-            android:name=".ui.screens.android.lessons.basics.shortcuts.tabs.VersionControlShortcutsActivity"
-            android:exported="false"
-            android:label="@string/version_control"
-            android:parentActivityName=".ui.screens.android.lessons.basics.shortcuts.ShortcutsActivity" />
         <activity
             android:name=".ui.screens.android.lessons.basics.history.AndroidHistory"
             android:exported="false"

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/basics/shortcuts/ShortcutsActivity.java

@@ -5,12 +5,14 @@
 import android.os.Bundle;
 
 import androidx.core.view.WindowCompat;
+import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 
 import com.d4rk.androidtutorials.java.R;
 import com.d4rk.androidtutorials.java.ads.AdUtils;
 import com.d4rk.androidtutorials.java.databinding.ActivityShortcutsBinding;
 import com.d4rk.androidtutorials.java.ui.components.navigation.UpNavigationActivity;
+import com.d4rk.androidtutorials.java.ui.screens.android.lessons.basics.shortcuts.tabs.ShortcutsCategoryActivity;
 import com.d4rk.androidtutorials.java.utils.EdgeToEdgeHelper;
 
 public class ShortcutsActivity extends UpNavigationActivity {
@@ -30,6 +32,28 @@ public static class SettingsFragment extends PreferenceFragmentCompat {
         @Override
         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
             setPreferencesFromResource(R.xml.preferences_shortcuts, rootKey);
+            setupPreference("shortcuts_general", R.layout.activity_shortcuts_general, R.string.general);
+            setupPreference("shortcuts_refactoring", R.layout.activity_shortcuts_refractoring, R.string.refactoring);
+            setupPreference("shortcuts_build", R.layout.activity_shortcuts_build, R.string.build_and_run);
+            setupPreference("shortcuts_debugging", R.layout.activity_shortcuts_debugging, R.string.debugging);
+            setupPreference("shortcuts_navigation", R.layout.activity_shortcuts_navigation_and_searching, R.string.navigation_and_searching);
+            setupPreference("shortcuts_code", R.layout.activity_shortcuts_code, R.string.writing_code);
+            setupPreference("shortcuts_version_control", R.layout.activity_shortcuts_version_control, R.string.version_control);
+        }
+
+        private void setupPreference(String key, int layoutResId, int titleResId) {
+            Preference preference = findPreference(key);
+            if (preference == null) {
+                return;
+            }
+
+            preference.setOnPreferenceClickListener(pref -> {
+                Intent intent = new Intent(requireContext(), ShortcutsCategoryActivity.class);
+                intent.putExtra(ShortcutsCategoryActivity.EXTRA_LAYOUT_RES_ID, layoutResId);
+                intent.putExtra(ShortcutsCategoryActivity.EXTRA_TITLE_RES_ID, titleResId);
+                startActivity(intent);
+                return true;
+            });
         }
     }
-}
+}

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/basics/shortcuts/tabs/BuildShortcutsActivity.java

@@ -0,0 +1,59 @@
+package com.d4rk.androidtutorials.java.ui.screens.android.lessons.basics.shortcuts.tabs;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.d4rk.androidtutorials.java.R;
+import com.d4rk.androidtutorials.java.ads.AdUtils;
+import com.d4rk.androidtutorials.java.ui.components.navigation.UpNavigationActivity;
+import com.d4rk.androidtutorials.java.utils.EdgeToEdgeHelper;
+
+import com.google.android.gms.ads.AdView;
+
+import me.zhanghai.android.fastscroll.FastScrollScrollView;
+import me.zhanghai.android.fastscroll.FastScrollerBuilder;
+
+public class ShortcutsCategoryActivity extends UpNavigationActivity {
+
+    public static final String EXTRA_LAYOUT_RES_ID =
+            "com.d4rk.androidtutorials.java.ui.screens.android.lessons.basics.shortcuts.tabs.EXTRA_LAYOUT_RES_ID";
+    public static final String EXTRA_TITLE_RES_ID =
+            "com.d4rk.androidtutorials.java.ui.screens.android.lessons.basics.shortcuts.tabs.EXTRA_TITLE_RES_ID";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        Intent intent = getIntent();
+        int layoutResId = intent.getIntExtra(EXTRA_LAYOUT_RES_ID, 0);
+        int titleResId = intent.getIntExtra(EXTRA_TITLE_RES_ID, R.string.shortcuts);
+
+        if (layoutResId == 0) {
+            finish();
+            return;
+        }
+
+        setContentView(layoutResId);
+        setTitle(titleResId);
+
+        View contentView = findViewById(android.R.id.content);
+        if (contentView instanceof ViewGroup) {
+            View root = ((ViewGroup) contentView).getChildAt(0);
+            if (root != null) {
+                EdgeToEdgeHelper.applyEdgeToEdge(getWindow(), root);
+            }
+        }
+
+        AdView adView = findViewById(R.id.ad_view);
+        if (adView != null) {
+            AdUtils.loadBanner(adView);
+        }
+
+        FastScrollScrollView scrollView = findViewById(R.id.scroll_view);
+        if (scrollView != null) {
+            new FastScrollerBuilder(scrollView).useMd2Style().build();
+        }
+    }
+}