Input settings: Associate keyboard layouts with device/IME subtype.

Implements selection of keyboard layouts using the new InputManager
methods that associate keyboard layouts to
device/InputMethodInfo/InputMethodSubtype
See: Ie88ce1ab77dbfe03ab51d89c1dc9e0a7ddbb3216

Bug: 25752812
Change-Id: Ib76880d66391ca37978054de80f4b3b5147cecc3

src/com/android/settings/inputmethod/KeyboardLayoutPickerFragment2.java

@@ -0,0 +1,155 @@
+/*
+ * 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 android.app.Activity;
+import android.hardware.input.InputDeviceIdentifier;
+import android.hardware.input.InputManager;
+import android.hardware.input.InputManager.InputDeviceListener;
+import android.hardware.input.KeyboardLayout;
+import android.os.Bundle;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.view.InputDevice;
+
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodSubtype;
+import com.android.internal.logging.MetricsLogger;
+import com.android.internal.util.Preconditions;
+import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class KeyboardLayoutPickerFragment2 extends SettingsPreferenceFragment
+        implements InputDeviceListener {
+
+    private InputDeviceIdentifier mInputDeviceIdentifier;
+    private int mInputDeviceId = -1;
+    private InputManager mIm;
+    private InputMethodInfo mImi;
+    private InputMethodSubtype mSubtype;
+    private KeyboardLayout[] mKeyboardLayouts;
+    private Map<Preference, KeyboardLayout> mPreferenceMap = new HashMap<>();
+
+    // TODO: Make these constants public API for b/25752827
+
+    /**
+     * Intent extra: The input device descriptor of the keyboard whose keyboard
+     * layout is to be changed.
+     */
+    public static final String EXTRA_INPUT_DEVICE_IDENTIFIER = "input_device_identifier";
+
+    /**
+     * Intent extra: The associated {@link InputMethodInfo}.
+     */
+    public static final String EXTRA_INPUT_METHOD_INFO = "input_method_info";
+
+    /**
+     * Intent extra: The associated {@link InputMethodSubtype}.
+     */
+    public static final String EXTRA_INPUT_METHOD_SUBTYPE = "input_method_subtype";
+
+    @Override
+    protected int getMetricsCategory() {
+        return MetricsLogger.INPUTMETHOD_KEYBOARD;
+    }
+
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        Activity activity = Preconditions.checkNotNull(getActivity());
+
+        mInputDeviceIdentifier = activity.getIntent().getParcelableExtra(
+                EXTRA_INPUT_DEVICE_IDENTIFIER);
+        mImi = activity.getIntent().getParcelableExtra(EXTRA_INPUT_METHOD_INFO);
+        mSubtype = activity.getIntent().getParcelableExtra(EXTRA_INPUT_METHOD_SUBTYPE);
+
+        if (mInputDeviceIdentifier == null || mImi == null || mSubtype == null) {
+            activity.finish();
+        }
+
+        mIm = activity.getSystemService(InputManager.class);
+        mKeyboardLayouts = mIm.getKeyboardLayoutsForInputDevice(mInputDeviceIdentifier);
+        Arrays.sort(mKeyboardLayouts);
+        setPreferenceScreen(createPreferenceHierarchy());
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        mIm.registerInputDeviceListener(this, null);
+
+        InputDevice inputDevice =
+                mIm.getInputDeviceByDescriptor(mInputDeviceIdentifier.getDescriptor());
+        if (inputDevice == null) {
+            getActivity().finish();
+            return;
+        }
+        mInputDeviceId = inputDevice.getId();
+    }
+
+    @Override
+    public void onPause() {
+        mIm.unregisterInputDeviceListener(this);
+        mInputDeviceId = -1;
+
+        super.onPause();
+    }
+
+    @Override
+    public boolean onPreferenceTreeClick(Preference preference) {
+        KeyboardLayout layout = mPreferenceMap.get(preference);
+        if (layout != null) {
+            mIm.setKeyboardLayoutForInputDevice(mInputDeviceIdentifier, mImi, mSubtype,
+                    layout.getDescriptor());
+            getActivity().finish();
+            return true;
+        }
+        return super.onPreferenceTreeClick(preference);
+    }
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {}
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {}
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+        if (mInputDeviceId >= 0 && deviceId == mInputDeviceId) {
+            getActivity().finish();
+        }
+    }
+
+    private PreferenceScreen createPreferenceHierarchy() {
+        PreferenceScreen root = getPreferenceManager().createPreferenceScreen(getActivity());
+
+        for (KeyboardLayout layout : mKeyboardLayouts) {
+            Preference pref = new Preference(getPrefContext());
+            pref.setTitle(layout.getLabel());
+            root.addPreference(pref);
+            mPreferenceMap.put(pref, layout);
+        }
+
+        root.setTitle(PhysicalKeyboardFragment.getDisplayName(getContext(), mImi, mSubtype));
+        return root;
+    }
+}