Add UI to select multiple keyboard layouts.

Bug: 6405203
Change-Id: I27ca4630aebcb39b83298d37d8fb3f4ef0080317

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

@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2012 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 com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
+
+import android.content.Context;
+import android.hardware.input.InputManager;
+import android.hardware.input.InputManager.InputDeviceListener;
+import android.hardware.input.KeyboardLayout;
+import android.os.Bundle;
+import android.preference.CheckBoxPreference;
+import android.preference.Preference;
+import android.preference.PreferenceScreen;
+import android.view.InputDevice;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+public class KeyboardLayoutPickerFragment extends SettingsPreferenceFragment
+        implements InputDeviceListener {
+    private String mInputDeviceDescriptor;
+    private int mInputDeviceId = -1;
+    private InputManager mIm;
+    private KeyboardLayout[] mKeyboardLayouts;
+    private HashMap<CheckBoxPreference, KeyboardLayout> mPreferenceMap =
+            new HashMap<CheckBoxPreference, KeyboardLayout>();
+
+    /**
+     * Intent extra: The input device descriptor of the keyboard whose keyboard
+     * layout is to be changed.
+     */
+    public static final String EXTRA_INPUT_DEVICE_DESCRIPTOR = "input_device_descriptor";
+
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        mInputDeviceDescriptor = getActivity().getIntent().getStringExtra(
+                EXTRA_INPUT_DEVICE_DESCRIPTOR);
+        if (mInputDeviceDescriptor == null) {
+            getActivity().finish();
+        }
+
+        mIm = (InputManager)getSystemService(Context.INPUT_SERVICE);
+        mKeyboardLayouts = mIm.getKeyboardLayouts();
+        Arrays.sort(mKeyboardLayouts);
+        setPreferenceScreen(createPreferenceHierarchy());
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        mIm.registerInputDeviceListener(this, null);
+
+        InputDevice inputDevice = mIm.getInputDeviceByDescriptor(mInputDeviceDescriptor);
+        if (inputDevice == null) {
+            getActivity().finish();
+            return;
+        }
+        mInputDeviceId = inputDevice.getId();
+
+        updateCheckedState();
+    }
+
+    @Override
+    public void onPause() {
+        mIm.unregisterInputDeviceListener(this);
+        mInputDeviceId = -1;
+
+        super.onPause();
+    }
+
+    @Override
+    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
+            Preference preference) {
+        if (preference instanceof CheckBoxPreference) {
+            CheckBoxPreference checkboxPref = (CheckBoxPreference)preference;
+            KeyboardLayout layout = mPreferenceMap.get(checkboxPref);
+            if (layout != null) {
+                boolean checked = checkboxPref.isChecked();
+                if (checked) {
+                    mIm.addKeyboardLayoutForInputDevice(mInputDeviceDescriptor,
+                            layout.getDescriptor());
+                } else {
+                    mIm.removeKeyboardLayoutForInputDevice(mInputDeviceDescriptor,
+                            layout.getDescriptor());
+                }
+                return true;
+            }
+        }
+        return super.onPreferenceTreeClick(preferenceScreen, preference);
+    }
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {
+    }
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {
+        if (mInputDeviceId >= 0 && deviceId == mInputDeviceId) {
+            updateCheckedState();
+        }
+    }
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+        if (mInputDeviceId >= 0 && deviceId == mInputDeviceId) {
+            getActivity().finish();
+        }
+    }
+
+    private PreferenceScreen createPreferenceHierarchy() {
+        PreferenceScreen root = getPreferenceManager().createPreferenceScreen(getActivity());
+        Context context = getActivity();
+
+        for (KeyboardLayout layout : mKeyboardLayouts) {
+            CheckBoxPreference pref = new CheckBoxPreference(context);
+            pref.setTitle(layout.getLabel());
+            pref.setSummary(layout.getCollection());
+            root.addPreference(pref);
+            mPreferenceMap.put(pref, layout);
+        }
+        return root;
+    }
+
+    private void updateCheckedState() {
+        String[] enabledKeyboardLayouts = mIm.getKeyboardLayoutsForInputDevice(
+                mInputDeviceDescriptor);
+        Arrays.sort(enabledKeyboardLayouts);
+
+        for (Map.Entry<CheckBoxPreference, KeyboardLayout> entry : mPreferenceMap.entrySet()) {
+            entry.getKey().setChecked(Arrays.binarySearch(enabledKeyboardLayouts,
+                    entry.getValue().getDescriptor()) >= 0);
+        }
+    }
+}