[Physical Keyboard] Listen input devices change

Create new fragment which listen input device change, when input device
detached while pages show, it will exist correctly.

Bug: 399284521
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Test: atest
packages/apps/Settings/tests/robotests/src/com/android/settings/inputmethod/

Change-Id: I3d6b9a4558866a8c4a3aa4fc30e500b8b6be90cd

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

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2025 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 android.hardware.input.InputManager;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+
+import com.android.internal.util.Preconditions;
+import com.android.settings.dashboard.DashboardFragment;
+
+public abstract class InputDeviceDashboardFragment extends DashboardFragment
+        implements InputManager.InputDeviceListener {
+    private InputManager mInputManager;
+
+    @Override
+    public void onCreate(@NonNull Bundle icicle) {
+        super.onCreate(icicle);
+        mInputManager = Preconditions.checkNotNull(getActivity()
+                .getSystemService(InputManager.class));
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        finishEarlyIfNeeded();
+        mInputManager.registerInputDeviceListener(this /* listener */, null /* handler */);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mInputManager.unregisterInputDeviceListener(this /* listener */);
+    }
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {
+        finishEarlyIfNeeded();
+    }
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+        finishEarlyIfNeeded();
+    }
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {
+        finishEarlyIfNeeded();
+    }
+
+    private void finishEarlyIfNeeded() {
+        if (getActivity() == null) {
+            return;
+        }
+        if (needToFinishEarly()) {
+            getActivity().finish();
+        }
+    }
+
+    /**
+     * Returns whether the fragment should still be displayed given the input devices that are
+     * currently connected.
+     */
+    protected abstract boolean needToFinishEarly();
+
+    protected static boolean isTouchpadDetached() {
+        return !InputPeripheralsSettingsUtils.isTouchpad();
+    }
+
+    protected static boolean isMouseDetached() {
+        return !InputPeripheralsSettingsUtils.isMouse();
+    }
+
+    protected static boolean isHardKeyboardDetached() {
+        return !InputPeripheralsSettingsUtils.isHardKeyboard();
+    }
+}