Implement new keyboard settings UI.

Add enabled input method locales page
Add keyboard layout picker page
Add keyboard settings entry in BT device detail

Bug: 242680718
Test: local test
Change-Id: I07e068ecde553d394697b25cb573f806229f6f52

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

@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2022 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.app.settings.SettingsEnums;
+import android.content.Context;
+import android.hardware.input.InputDeviceIdentifier;
+import android.hardware.input.InputManager;
+import android.os.Bundle;
+import android.view.InputDevice;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+
+import com.android.settings.R;
+import com.android.settings.core.SubSettingLauncher;
+import com.android.settings.dashboard.DashboardFragment;
+
+public class NewKeyboardLayoutEnabledLocalesFragment extends DashboardFragment
+        implements InputManager.InputDeviceListener {
+
+    private static final String TAG = "NewKeyboardLayoutEnabledLocalesFragment";
+    private static final String PREF_KEY_ENABLED_LOCALES = "enabled_locales_keyboard_layout";
+
+    static final String EXTRA_KEYBOARD_DEVICE_NAME = "extra_keyboard_device_name";
+
+    private InputManager mIm;
+    private InputDeviceIdentifier mInputDeviceIdentifier;
+    private int mInputDeviceId;
+    private Context mContext;
+
+    @Override
+    public void onActivityCreated(final Bundle icicle) {
+        super.onActivityCreated(icicle);
+
+        Bundle arguments = getArguments();
+        final String title = arguments.getString(EXTRA_KEYBOARD_DEVICE_NAME);
+        mInputDeviceIdentifier = arguments.getParcelable(
+                KeyboardLayoutPickerFragment.EXTRA_INPUT_DEVICE_IDENTIFIER);
+        getActivity().setTitle(title);
+        final PreferenceCategory category = findPreference(PREF_KEY_ENABLED_LOCALES);
+
+        // TODO(b/252816846): Need APIs to get the available keyboards from Inputmanager.
+        // For example: InputMethodManager.getEnabledInputMethodLocales()
+        //              InputManager.getKeyboardLayoutForLocale()
+        // Hardcode the default value for demo purpose
+        String[] keyboardLanguages = {"English (US)", "German (Germany)", "Spanish (Spain)"};
+        String[] keyboardLayouts = {"English (US)", "German", "Spanish"};
+        for (int i = 0; i < keyboardLanguages.length; i++) {
+            final Preference pref = new Preference(mContext);
+            String key = "keyboard_language_label_" + String.valueOf(i);
+            String keyboardLanguageTitle = keyboardLanguages[i];
+            String keyboardLanguageSummary = keyboardLayouts[i];
+            // TODO: Waiting for new API to use a prefix with special number to setKey
+            pref.setKey(key);
+            pref.setTitle(keyboardLanguageTitle);
+            pref.setSummary(keyboardLanguageSummary);
+            pref.setOnPreferenceClickListener(
+                    preference -> {
+                        showKeyboardLayoutPicker(
+                                keyboardLanguageTitle,
+                                keyboardLanguageSummary,
+                                mInputDeviceIdentifier);
+                        return true;
+                    });
+            category.addPreference(pref);
+        }
+    }
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {
+        // Do nothing.
+    }
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+        if (mInputDeviceId >= 0 && deviceId == mInputDeviceId) {
+            getActivity().finish();
+        }
+    }
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {
+        if (mInputDeviceId >= 0 && deviceId == mInputDeviceId) {
+            // TODO(b/252816846): Need APIs to update the available keyboards.
+        }
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mContext = getContext();
+        mIm = mContext.getSystemService(InputManager.class);
+        mInputDeviceId = -1;
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        mIm.registerInputDeviceListener(this, null);
+        final InputDevice inputDevice =
+                mIm.getInputDeviceByDescriptor(mInputDeviceIdentifier.getDescriptor());
+        if (inputDevice == null) {
+            getActivity().finish();
+            return;
+        }
+        mInputDeviceId = inputDevice.getId();
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        mIm.unregisterInputDeviceListener(this);
+        mInputDeviceId = -1;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        // TODO(b/252816846): Need APIs to get the available keyboards from Inputmanager.
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.SETTINGS_KEYBOARDS_ENABLED_LOCALES;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.keyboard_settings_enabled_locales_list;
+    }
+
+    private void showKeyboardLayoutPicker(String language, String layout,
+            InputDeviceIdentifier inputDeviceIdentifier) {
+        Bundle arguments = new Bundle();
+        arguments.putParcelable(KeyboardLayoutPickerFragment.EXTRA_INPUT_DEVICE_IDENTIFIER,
+                inputDeviceIdentifier);
+        arguments.putString(NewKeyboardLayoutPickerFragment.EXTRA_TITLE, language);
+        arguments.putString(NewKeyboardLayoutPickerFragment.EXTRA_KEYBOARD_LAYOUT, layout);
+        new SubSettingLauncher(mContext)
+                .setSourceMetricsCategory(getMetricsCategory())
+                .setDestination(NewKeyboardLayoutPickerFragment.class.getName())
+                .setArguments(arguments)
+                .launch();
+    }
+}