Fix startup crash and remove Kotlin references

Author: MihaiCristianCondrea

CHANGELOG.md

@@ -77,7 +77,7 @@
 - Added functionality to "Music" chip.
 - Added app updater dialog and ability to update in background.
 - Added comments to the Java code samples for better understanding.
-- Refactored app's codebase from Kotlin to Java to match the name and style of the app.
+- Refactored app's codebase to Java to match the name and style of the app.
 - Fixed all crash reports from Google Play Console and Google Firebase.
 - Made various improvements to languages and fixed some typos.
 - Made under-the-hood improvements for a better overall app experience.

README.md

@@ -6,10 +6,12 @@
 
 **Learn how to make simple apps in Android Studio.**
 
-Android Studio Tutorials: Java Edition is the sister project of [Android Studio Tutorials: Kotlin Edition](https://github.com/D4rK7355608/com.d4rk.androidtutorials). This guide provides practical examples and complete source code to help you build your first Android application using Android Studio and Java.
+Android Studio Tutorials: Java Edition provides practical examples and complete source code to help you build your first Android application using Android Studio with Java and XML.
 
 Our app is designed to be easy to use and lightweight. Plus, it's free and open‑source!
 
+> **Note:** This project is built solely with Java and XML. Kotlin and Jetpack Compose are not used.
+
 ## Features
 
 - Java and XML code examples

app/src/main/AndroidManifest.xml

@@ -40,7 +40,7 @@
         <activity
             android:name=".ui.screens.startup.StartupActivity"
             android:exported="true"
-            android:theme="@style/SplashScreenTheme" />
+            android:theme="@style/AppTheme" />
 
         <activity
             android:name=".ui.screens.main.MainActivity"

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/DefaultMainRepository.java

@@ -1,10 +1,7 @@
 package com.d4rk.androidtutorials.java.data.repository;
 
 import android.content.Context;
-import android.content.Intent;
 import android.content.SharedPreferences;
-import android.content.pm.PackageManager;
-import android.net.Uri;
 
 import androidx.appcompat.app.AppCompatDelegate;
 import androidx.core.os.LocaleListCompat;
@@ -47,22 +44,6 @@ private static int getNewNightMode(String[] darkModeValues, int currentNightMode
         return newNightMode;
     }
 
-    /**
-     * Check if a given package name is installed.
-     *
-     * @param packageName The package to check.
-     * @return True if installed, false otherwise.
-     */
-    public boolean isAppInstalled(String packageName) {
-        PackageManager packageManager = context.getPackageManager();
-        try {
-            packageManager.getPackageInfo(packageName, 0);
-            return true;
-        } catch (PackageManager.NameNotFoundException e) {
-            return false;
-        }
-    }
-
     /**
      * Retrieves the user's theme preference and applies it.
      * This method returns true if a change was applied (so the Activity can decide if it needs to recreate).
@@ -134,19 +115,4 @@ public AppUpdateManager getAppUpdateManager() {
         return appUpdateManager;
     }
 
-    /**
-     * Creates an intent to open your other app or fallback to Google Play if not installed.
-     */
-    public Intent buildShortcutIntent(boolean isInstalled) {
-        if (isInstalled) {
-            return new Intent(Intent.ACTION_MAIN)  // <--- set an ACTION
-                    .addCategory(Intent.CATEGORY_LAUNCHER) // optional for typical launcher scenario
-                    .setClassName("com.d4rk.androidtutorials", "com.d4rk.androidtutorials.MainActivity")
-                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        } else {
-            return new Intent(Intent.ACTION_VIEW)
-                    .setData(Uri.parse("https://play.google.com/store/apps/details?id=com.d4rk.androidtutorials"))
-                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        }
-    }
 }

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/MainRepository.java

@@ -1,16 +1,13 @@
 package com.d4rk.androidtutorials.java.data.repository;
 
-import android.content.Intent;
 import com.google.android.play.core.appupdate.AppUpdateManager;
 
 public interface MainRepository {
-    boolean isAppInstalled(String packageName);
     boolean applyThemeSettings(String[] darkModeValues);
     String getBottomNavLabelVisibility();
     String getDefaultTabPreference();
     boolean shouldShowStartupScreen();
     void markStartupScreenShown();
     void applyLanguageSettings();
     AppUpdateManager getAppUpdateManager();
-    Intent buildShortcutIntent(boolean isInstalled);
 }

app/src/main/java/com/d4rk/androidtutorials/java/di/AppModule.java

@@ -29,11 +29,9 @@
 import com.d4rk.androidtutorials.java.domain.home.GetAppPlayStoreUrlUseCase;
 import com.d4rk.androidtutorials.java.domain.main.ApplyLanguageSettingsUseCase;
 import com.d4rk.androidtutorials.java.domain.main.ApplyThemeSettingsUseCase;
-import com.d4rk.androidtutorials.java.domain.main.BuildShortcutIntentUseCase;
 import com.d4rk.androidtutorials.java.domain.main.GetAppUpdateManagerUseCase;
 import com.d4rk.androidtutorials.java.domain.main.GetBottomNavLabelVisibilityUseCase;
 import com.d4rk.androidtutorials.java.domain.main.GetDefaultTabPreferenceUseCase;
-import com.d4rk.androidtutorials.java.domain.main.IsAppInstalledUseCase;
 import com.d4rk.androidtutorials.java.domain.main.MarkStartupScreenShownUseCase;
 import com.d4rk.androidtutorials.java.domain.main.ShouldShowStartupScreenUseCase;
 import com.d4rk.androidtutorials.java.domain.quiz.LoadQuizQuestionsUseCase;
@@ -171,16 +169,6 @@ public MarkStartupScreenShownUseCase provideMarkStartupScreenShownUseCase(MainRe
         return new MarkStartupScreenShownUseCase(repository);
     }
 
-    @Provides
-    public IsAppInstalledUseCase provideIsAppInstalledUseCase(MainRepository repository) {
-        return new IsAppInstalledUseCase(repository);
-    }
-
-    @Provides
-    public BuildShortcutIntentUseCase provideBuildShortcutIntentUseCase(MainRepository repository) {
-        return new BuildShortcutIntentUseCase(repository);
-    }
-
     @Provides
     public GetAppUpdateManagerUseCase provideGetAppUpdateManagerUseCase(MainRepository repository) {
         return new GetAppUpdateManagerUseCase(repository);

app/src/main/java/com/d4rk/androidtutorials/java/domain/main/BuildShortcutIntentUseCase.java

@@ -18,9 +18,6 @@
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
-import androidx.core.content.pm.ShortcutInfoCompat;
-import androidx.core.content.pm.ShortcutManagerCompat;
-import androidx.core.graphics.drawable.IconCompat;
 import androidx.core.splashscreen.SplashScreen;
 import androidx.lifecycle.DefaultLifecycleObserver;
 import androidx.lifecycle.LifecycleOwner;
@@ -123,7 +120,6 @@ protected void onCreate(Bundle savedInstanceState) {
         String[] defaultTabValues = getResources().getStringArray(R.array.preference_default_tab_values);
         mainViewModel.applySettings(themeValues, bottomNavBarLabelsValues, defaultTabValues);
 
-        launcherShortcuts();
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
             requestPermissions(new String[]{Manifest.permission.POST_NOTIFICATIONS}, 1);
@@ -162,18 +158,6 @@ private void setupActionBar() {
         }
     }
 
-    private void launcherShortcuts() {
-        boolean isInstalled = mainViewModel.isAndroidTutorialsInstalled();
-
-        ShortcutInfoCompat shortcut = new ShortcutInfoCompat.Builder(this, "shortcut_id")
-                .setShortLabel(getString(R.string.shortcut_kotlin_edition_short))
-                .setLongLabel(getString(R.string.shortcut_kotlin_edition_long))
-                .setIcon(IconCompat.createWithResource(this, R.mipmap.ic_shortcut_kotlin_edition))
-                .setIntent(mainViewModel.getShortcutIntent(isInstalled))
-                .build();
-
-        ShortcutManagerCompat.pushDynamicShortcut(this, shortcut);
-    }
 
     private boolean shouldUseNavigationRail() {
         return getResources().getConfiguration().smallestScreenWidthDp >= 600;

app/src/main/java/com/d4rk/androidtutorials/java/domain/main/IsAppInstalledUseCase.java

@@ -1,6 +1,5 @@
 package com.d4rk.androidtutorials.java.ui.screens.main;
 
-import android.content.Intent;
 
 import androidx.lifecycle.ViewModel;
 import androidx.lifecycle.LiveData;
@@ -13,8 +12,6 @@
 import com.d4rk.androidtutorials.java.domain.main.ApplyLanguageSettingsUseCase;
 import com.d4rk.androidtutorials.java.domain.main.ShouldShowStartupScreenUseCase;
 import com.d4rk.androidtutorials.java.domain.main.MarkStartupScreenShownUseCase;
-import com.d4rk.androidtutorials.java.domain.main.IsAppInstalledUseCase;
-import com.d4rk.androidtutorials.java.domain.main.BuildShortcutIntentUseCase;
 import com.d4rk.androidtutorials.java.domain.main.GetAppUpdateManagerUseCase;
 import com.google.android.material.navigation.NavigationBarView;
 import com.google.android.play.core.appupdate.AppUpdateManager;
@@ -35,8 +32,6 @@ public class MainViewModel extends ViewModel {
     private final ApplyLanguageSettingsUseCase applyLanguageSettingsUseCase;
     private final ShouldShowStartupScreenUseCase shouldShowStartupScreenUseCase;
     private final MarkStartupScreenShownUseCase markStartupScreenShownUseCase;
-    private final IsAppInstalledUseCase isAppInstalledUseCase;
-    private final BuildShortcutIntentUseCase buildShortcutIntentUseCase;
     private final GetAppUpdateManagerUseCase getAppUpdateManagerUseCase;
     private final MutableLiveData<MainUiState> uiState = new MutableLiveData<>();
     private final MutableLiveData<Boolean> isLoading = new MutableLiveData<>(false);
@@ -48,17 +43,13 @@ public MainViewModel(ApplyThemeSettingsUseCase applyThemeSettingsUseCase,
                          ApplyLanguageSettingsUseCase applyLanguageSettingsUseCase,
                          ShouldShowStartupScreenUseCase shouldShowStartupScreenUseCase,
                          MarkStartupScreenShownUseCase markStartupScreenShownUseCase,
-                         IsAppInstalledUseCase isAppInstalledUseCase,
-                         BuildShortcutIntentUseCase buildShortcutIntentUseCase,
                          GetAppUpdateManagerUseCase getAppUpdateManagerUseCase) {
         this.applyThemeSettingsUseCase = applyThemeSettingsUseCase;
         this.getBottomNavLabelVisibilityUseCase = getBottomNavLabelVisibilityUseCase;
         this.getDefaultTabPreferenceUseCase = getDefaultTabPreferenceUseCase;
         this.applyLanguageSettingsUseCase = applyLanguageSettingsUseCase;
         this.shouldShowStartupScreenUseCase = shouldShowStartupScreenUseCase;
         this.markStartupScreenShownUseCase = markStartupScreenShownUseCase;
-        this.isAppInstalledUseCase = isAppInstalledUseCase;
-        this.buildShortcutIntentUseCase = buildShortcutIntentUseCase;
         this.getAppUpdateManagerUseCase = getAppUpdateManagerUseCase;
     }
 
@@ -118,20 +109,6 @@ public void markStartupScreenShown() {
         markStartupScreenShownUseCase.invoke();
     }
 
-    /**
-     * Check if the “Android Tutorials” app is installed or not.
-     */
-    public boolean isAndroidTutorialsInstalled() {
-        return isAppInstalledUseCase.invoke("com.d4rk.androidtutorials.java");
-    }
-
-    /**
-     * Build the intent for the shortcut (opens app if installed, or fallback to the Play Store).
-     */
-    public Intent getShortcutIntent(boolean isInstalled) {
-        return buildShortcutIntentUseCase.invoke(isInstalled);
-    }
-
     /**
      * Expose the consolidated UI state so MainActivity can observe it.
      */