Refactor IMEAndLanguageSettings to use PreferenceController

Bug: 32642706
Bug: 32637613
Bug: 32643833
Test: RunSettingsRoboTests

This change is necessary to test preference controlling logic, as well
as making preferences reusable in other Preference pages in the new
information architecture.

Change-Id: I9e2fd2f6800579f005a5c303ed03ae06477006a6

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

@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2016 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.content.Context;
+import android.hardware.input.InputManager;
+import android.provider.Settings;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+import android.view.InputDevice;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.lifecycle.LifecycleObserver;
+import com.android.settings.core.lifecycle.events.OnPause;
+import com.android.settings.core.lifecycle.events.OnResume;
+
+public class GameControllerPreferenceController extends PreferenceController
+        implements InputManager.InputDeviceListener, LifecycleObserver, OnResume, OnPause {
+
+    public static final String PREF_KEY = "vibrate_input_devices";
+    private static final String CATEGORY_KEY = "game_controller_settings_category";
+
+    private final InputManager mIm;
+
+    private PreferenceScreen mScreen;
+    private Preference mCategory;
+    private Preference mPreference;
+
+    public GameControllerPreferenceController(Context context) {
+        super(context);
+        mIm = (InputManager) context.getSystemService(Context.INPUT_SERVICE);
+    }
+
+    @Override
+    public void onResume() {
+        mIm.registerInputDeviceListener(this, null);
+    }
+
+    @Override
+    public void onPause() {
+        mIm.unregisterInputDeviceListener(this);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mScreen = screen;
+        mCategory = screen.findPreference(CATEGORY_KEY);
+        mPreference = screen.findPreference(PREF_KEY);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        final int[] devices = mIm.getInputDeviceIds();
+        for (int deviceId : devices) {
+            InputDevice device = mIm.getInputDevice(deviceId);
+            if (device != null && !device.isVirtual() && device.getVibrator().hasVibrator()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (TextUtils.equals(PREF_KEY, preference.getKey())) {
+            Settings.System.putInt(mContext.getContentResolver(),
+                    Settings.System.VIBRATE_INPUT_DEVICES,
+                    ((SwitchPreference) preference).isChecked() ? 1 : 0);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return CATEGORY_KEY;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        if (preference == null) {
+            return;
+        }
+        ((SwitchPreference) preference).setChecked(Settings.System.getInt(
+                mContext.getContentResolver(),
+                Settings.System.VIBRATE_INPUT_DEVICES, 1) > 0);
+    }
+
+    @Override
+    public void onInputDeviceAdded(int deviceId) {
+        updateGameControllers();
+    }
+
+    @Override
+    public void onInputDeviceRemoved(int deviceId) {
+        updateGameControllers();
+    }
+
+    @Override
+    public void onInputDeviceChanged(int deviceId) {
+        updateGameControllers();
+    }
+
+    private void updateGameControllers() {
+        if (isAvailable()) {
+            mScreen.addPreference(mCategory);
+            updateState(mPreference);
+        } else {
+            if (mCategory != null) {
+                mScreen.removePreference(mCategory);
+            }
+        }
+    }
+}