Android: Fix rescanning on first app launch after cache clear

GameFileCacheService.startRescan (in MainPresenter.onResume)
does nothing if called before GameFileCacheService.startLoad.
Fixes a 3f71c36 regression where already added games would not
show up after app launch under specific circumstances.

Unfortunately the loading indicator still doesn't show up
during a rescan initiated by app launch, but that would
be more annoying to fix, so I will leave it for now.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/services/GameFileCacheService.java

@@ -42,6 +42,7 @@ public final class GameFileCacheService extends IntentService
   private static final AtomicReference<GameFile[]> gameFiles =
           new AtomicReference<>(new GameFile[]{});
   private static final AtomicInteger unhandledIntents = new AtomicInteger(0);
+  private static final AtomicInteger unhandledRescanIntents = new AtomicInteger(0);
 
   public GameFileCacheService()
   {
@@ -105,11 +106,22 @@ public final class GameFileCacheService extends IntentService
       return new String[]{gameFile.getPath(), secondFile.getPath()};
   }
 
+  /**
+   * Returns true if in the process of either loading the cache or rescanning.
+   */
   public static boolean isLoading()
   {
     return unhandledIntents.get() != 0;
   }
 
+  /**
+   * Returns true if in the process of rescanning.
+   */
+  public static boolean isRescanning()
+  {
+    return unhandledRescanIntents.get() != 0;
+  }
+
   private static void startService(Context context, String action)
   {
     Intent intent = new Intent(context, GameFileCacheService.class);
@@ -137,6 +149,7 @@ public final class GameFileCacheService extends IntentService
   public static void startRescan(Context context)
   {
     unhandledIntents.getAndIncrement();
+    unhandledRescanIntents.getAndIncrement();
 
     new AfterDirectoryInitializationRunner().run(context, false,
             () -> startService(context, ACTION_RESCAN));
@@ -173,7 +186,9 @@ public final class GameFileCacheService extends IntentService
     }
 
     // Rescan the file system and update the game list cache with the results
-    if (ACTION_RESCAN.equals(intent.getAction()) && gameFileCache != null)
+    if (ACTION_RESCAN.equals(intent.getAction()))
+    {
+      if (gameFileCache != null)
       {
         synchronized (gameFileCache)
         {
@@ -198,6 +213,9 @@ public final class GameFileCacheService extends IntentService
         }
       }
 
+      unhandledRescanIntents.decrementAndGet();
+    }
+
     int intentsLeft = unhandledIntents.decrementAndGet();
     if (intentsLeft == 0)
     {

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/MainActivity.java

@@ -82,8 +82,6 @@ public final class MainActivity extends AppCompatActivity
   {
     super.onResume();
 
-    mPresenter.onResume();
-
     if (DirectoryInitialization.shouldStart(this))
     {
       DirectoryInitialization.start(this);
@@ -91,6 +89,8 @@ public final class MainActivity extends AppCompatActivity
               .run(this, false, this::setPlatformTabsAndStartGameFileCacheService);
     }
 
+    mPresenter.onResume();
+
     // In case the user changed a setting that affects how games are displayed,
     // such as system language, cover downloading...
     forEachPlatformGamesView(PlatformGamesView::refetchMetadata);

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/MainPresenter.java

@@ -132,7 +132,7 @@ public final class MainPresenter
       mDirToAdd = null;
     }
 
-    if (sShouldRescanLibrary && !GameFileCacheService.isLoading())
+    if (sShouldRescanLibrary && !GameFileCacheService.isRescanning())
     {
       new AfterDirectoryInitializationRunner().run(mContext, false, () ->
       {

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/main/TvMainActivity.java

@@ -71,14 +71,14 @@ public final class TvMainActivity extends FragmentActivity
   {
     super.onResume();
 
-    mPresenter.onResume();
-
     if (DirectoryInitialization.shouldStart(this))
     {
       DirectoryInitialization.start(this);
       GameFileCacheService.startLoad(this);
     }
 
+    mPresenter.onResume();
+
     // In case the user changed a setting that affects how games are displayed,
     // such as system language, cover downloading...
     refetchMetadata();