Fix Talkback wrong label announced going from App to Overview

To fix the incorrect title information being spoken after a transition state ends, a new function named getTitle is introduced in the LauncherState. This function provides the correct title for the transition state. The default accessibility label is set to R.string.home_screen. All Apps and Overview states override the getTitle function to ensure the correct accessibility label for their respective states.

Fix: 265892510
Flag: EXEMPT bugfix
Test: Manual with Talkback. With Talkback enabled, navigate from App to Overview.
Change-Id: I96b820f310f8b778a149709bca687a5912386246

quickstep/src/com/android/launcher3/uioverrides/states/AllAppsState.java

@@ -101,6 +101,11 @@ public class AllAppsState extends LauncherState {
         return launcher.getAppsView().getDescription();
     }
 
+    @Override
+    public int getTitle() {
+        return R.string.all_apps_label;
+    }
+
     @Override
     public float getVerticalProgress(Launcher launcher) {
         return 0f;

quickstep/src/com/android/launcher3/uioverrides/states/OverviewState.java

@@ -182,6 +182,11 @@ public class OverviewState extends LauncherState {
         return launcher.getString(R.string.accessibility_recent_apps);
     }
 
+    @Override
+    public int getTitle() {
+        return R.string.accessibility_recent_apps;
+    }
+
     public static float getDefaultSwipeHeight(Launcher launcher) {
         return LayoutUtils.getDefaultSwipeHeight(launcher, launcher.getDeviceProfile());
     }

quickstep/src/com/android/quickstep/RecentsActivity.java

@@ -371,6 +371,9 @@ public final class RecentsActivity extends StatefulActivity<RecentsState> implem
         getSystemUiController().updateUiState(SystemUiController.UI_STATE_BASE_WINDOW,
                 Themes.getAttrBoolean(this, R.attr.isWorkspaceDarkText));
         ACTIVITY_TRACKER.handleCreate(this);
+
+        // Set screen title for Talkback
+        setTitle(R.string.accessibility_recent_apps);
     }
 
     @Override

src/com/android/launcher3/Launcher.java

@@ -1268,11 +1268,7 @@ public class Launcher extends StatefulActivity<LauncherState>
         }
 
         // Set screen title for Talkback
-        if (state == ALL_APPS) {
-            setTitle(R.string.all_apps_label);
-        } else {
-            setTitle(R.string.home_screen);
-        }
+        setTitle(state.getTitle());
     }
 
     /**

src/com/android/launcher3/LauncherState.java

@@ -38,6 +38,7 @@ import android.view.View;
 import android.view.animation.Interpolator;
 
 import androidx.annotation.FloatRange;
+import androidx.annotation.StringRes;
 
 import com.android.launcher3.statemanager.BaseState;
 import com.android.launcher3.statemanager.StateManager;
@@ -369,6 +370,10 @@ public abstract class LauncherState implements BaseState<LauncherState> {
         return launcher.getWorkspace().getCurrentPageDescription();
     }
 
+    public @StringRes int getTitle() {
+        return R.string.home_screen;
+    }
+
     public PageAlphaProvider getWorkspacePageAlphaProvider(Launcher launcher) {
         if ((this != NORMAL && this != HINT_STATE)
                 || !launcher.getDeviceProfile().shouldFadeAdjacentWorkspaceScreens()) {

src_no_quickstep/com/android/launcher3/uioverrides/states/AllAppsState.java

@@ -52,6 +52,11 @@ public class AllAppsState extends LauncherState {
         return launcher.getString(R.string.all_apps_button_label);
     }
 
+    @Override
+    public int getTitle() {
+        return R.string.all_apps_label;
+    }
+
     @Override
     public int getVisibleElements(Launcher launcher) {
         return ALL_APPS_CONTENT;