[16/n] Letterbox Education: focus on the dialog title for accessibility.

This will cause talkback to read the title and the rest of the dialog when the user swipes right.

Bug: 222112590
Test: atest WMShellUnitTests:LetterboxEduDialogLayoutTest
Test: atest WMShellUnitTests:LetterboxEduWindowManagerTest
Change-Id: Id850520380144055c9efa95f6006b7b277cf8eb9

libs/WindowManager/Shell/src/com/android/wm/shell/compatui/letterboxedu/LetterboxEduDialogLayout.java

@@ -21,6 +21,7 @@ import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.view.View;
+import android.widget.TextView;
 
 import androidx.constraintlayout.widget.ConstraintLayout;
 
@@ -38,6 +39,7 @@ class LetterboxEduDialogLayout extends ConstraintLayout {
     // 204 is simply 255 * 0.8.
     static final int BACKGROUND_DIM_ALPHA = 204;
     private View mDialogContainer;
+    private TextView mDialogTitle;
     private Drawable mBackgroundDim;
 
     public LetterboxEduDialogLayout(Context context) {
@@ -61,6 +63,10 @@ class LetterboxEduDialogLayout extends ConstraintLayout {
         return mDialogContainer;
     }
 
+    TextView getDialogTitle() {
+        return mDialogTitle;
+    }
+
     Drawable getBackgroundDim() {
         return mBackgroundDim;
     }
@@ -84,6 +90,7 @@ class LetterboxEduDialogLayout extends ConstraintLayout {
     protected void onFinishInflate() {
         super.onFinishInflate();
         mDialogContainer = findViewById(R.id.letterbox_education_dialog_container);
+        mDialogTitle = findViewById(R.id.letterbox_education_dialog_title);
         mBackgroundDim = getBackground().mutate();
         // Set the alpha of the background dim to 0 for enter animation.
         mBackgroundDim.setAlpha(0);

libs/WindowManager/Shell/src/com/android/wm/shell/compatui/letterboxedu/LetterboxEduWindowManager.java

@@ -28,6 +28,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup.MarginLayoutParams;
 import android.view.WindowManager;
+import android.view.accessibility.AccessibilityEvent;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.wm.shell.R;
@@ -132,7 +133,7 @@ public class LetterboxEduWindowManager extends CompatUIWindowManagerAbstract {
         updateDialogMargins();
 
         mAnimationController.startEnterAnimation(mLayout, /* endCallback= */
-                this::setDismissOnClickListener);
+                this::onDialogEnterAnimationEnded);
 
         return mLayout;
     }
@@ -157,11 +158,13 @@ public class LetterboxEduWindowManager extends CompatUIWindowManagerAbstract {
                 R.layout.letterbox_education_dialog_layout, null);
     }
 
-    private void setDismissOnClickListener() {
+    private void onDialogEnterAnimationEnded() {
         if (mLayout == null) {
             return;
         }
         mLayout.setDismissOnClickListener(this::onDismiss);
+        // Focus on the dialog title for accessibility.
+        mLayout.getDialogTitle().sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
     }
 
     private void onDismiss() {

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/compatui/letterboxedu/LetterboxEduDialogLayoutTest.java

@@ -70,6 +70,8 @@ public class LetterboxEduDialogLayoutTest extends ShellTestCase {
     public void testOnFinishInflate() {
         assertEquals(mLayout.getDialogContainer(),
                 mLayout.findViewById(R.id.letterbox_education_dialog_container));
+        assertEquals(mLayout.getDialogTitle(),
+                mLayout.findViewById(R.id.letterbox_education_dialog_title));
         assertEquals(mLayout.getBackgroundDim(), mLayout.getBackground());
         assertEquals(mLayout.getBackground().getAlpha(), 0);
     }

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/compatui/letterboxedu/LetterboxEduWindowManagerTest.java

@@ -41,9 +41,11 @@ import android.testing.AndroidTestingRunner;
 import android.view.DisplayCutout;
 import android.view.DisplayInfo;
 import android.view.SurfaceControlViewHost;
+import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.MarginLayoutParams;
 import android.view.WindowManager;
+import android.view.accessibility.AccessibilityEvent;
 
 import androidx.test.filters.SmallTest;
 
@@ -173,13 +175,19 @@ public class LetterboxEduWindowManagerTest extends ShellTestCase {
         verifyLayout(layout, mWindowAttrsCaptor.getValue(), /* expectedWidth= */ TASK_WIDTH,
                 /* expectedHeight= */ TASK_HEIGHT, /* expectedExtraTopMargin= */ DISPLAY_CUTOUT_TOP,
                 /* expectedExtraBottomMargin= */ DISPLAY_CUTOUT_BOTTOM);
+        View dialogTitle = layout.getDialogTitle();
+        assertNotNull(dialogTitle);
+        spyOn(dialogTitle);
 
         // Clicking the layout does nothing until enter animation is done.
         layout.performClick();
         verify(mAnimationController, never()).startExitAnimation(any(), any());
+        // The dialog title shouldn't be focused for Accessibility until enter animation is done.
+        verify(dialogTitle, never()).sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
 
         verifyAndFinishEnterAnimation(layout);
 
+        verify(dialogTitle).sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
         // Exit animation should start following a click on the layout.
         layout.performClick();