[Physical Keyboard][A11y Page] Add new Keyboard A11y page

Add new Keyboard A11y page, and controled with flag.
Demo video: b/345399212#comment6

Bug: 345399212
Test: atest SettingsRoboTests
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Change-Id: I4bd45ff16c8abb33e1cf56c377ea86c20195fe26

src/com/android/settings/inputmethod/PhysicalKeyboardA11yFragment.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.inputmethod;
+
+import static com.android.settings.inputmethod.PhysicalKeyboardFragment.getHardKeyboards;
+
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+import android.hardware.input.InputManager;
+
+import androidx.annotation.NonNull;
+
+import com.android.internal.util.Preconditions;
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.keyboard.Flags;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.search.SearchIndexable;
+import com.android.settingslib.utils.ThreadUtils;
+
+import java.util.List;
+
+@SearchIndexable
+public class PhysicalKeyboardA11yFragment extends DashboardFragment
+        implements InputManager.InputDeviceListener {
+    private static final String TAG = "KeyboardAndTouchA11yFragment";
+
+    private InputManager mInputManager;
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.PHYSICAL_KEYBOARD_A11Y;
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        mInputManager = Preconditions.checkNotNull(getActivity()
+                .getSystemService(InputManager.class));
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        finishEarlyIfNeeded();
+        mInputManager.registerInputDeviceListener(this, null);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mInputManager.unregisterInputDeviceListener(this);
+    }
+
+    private void finishEarlyIfNeeded() {
+        final Context context = getContext();
+        ThreadUtils.postOnBackgroundThread(() -> {
+            final List<PhysicalKeyboardFragment.HardKeyboardDeviceInfo> newHardKeyboards =
+                    getHardKeyboards(context);
+            if (newHardKeyboards.isEmpty()) {
+                getActivity().finish();
+            }
+        });
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.physical_keyboard_a11y_settings;
+    }
+
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider(R.xml.physical_keyboard_a11y_settings) {
+                @Override
+                protected boolean isPageSearchEnabled(Context context) {
+                    return Flags.keyboardAndTouchpadA11yNewPageEnabled()
+                            && !getHardKeyboards(context).isEmpty();
+                }
+            };
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {
+        finishEarlyIfNeeded();
+    }
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+        finishEarlyIfNeeded();
+    }
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {
+        finishEarlyIfNeeded();
+    }
+}