Add Screen pinning back to settings

Adds a basic screen for screen pinning (previously lock-to-app) to
settings that describes the feature and allows it to be turned on
and off.

Bug: 16378448
Depends on Ide333463f86310eacb7a1d8b6dc7b1aea8722713 for Settings
constant
Change-Id: Id3ef8471794aa01de20efeb947bed95c50d6b954

src/com/android/settings/ScreenPinningSettings.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2014 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;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Switch;
+
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settings.search.Indexable;
+import com.android.settings.search.SearchIndexableRaw;
+import com.android.settings.widget.SwitchBar;
+
+/**
+ * Screen pinning settings.
+ */
+public class ScreenPinningSettings extends SettingsPreferenceFragment
+        implements SwitchBar.OnSwitchChangeListener, Indexable {
+
+    private SwitchBar mSwitchBar;
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        final SettingsActivity activity = (SettingsActivity) getActivity();
+
+        mSwitchBar = activity.getSwitchBar();
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
+        mSwitchBar.setChecked(isLockToAppEnabled());
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        mSwitchBar.removeOnSwitchChangeListener(this);
+        mSwitchBar.hide();
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.screen_pinning_instructions, null);
+    }
+
+    private boolean isLockToAppEnabled() {
+        try {
+            return Settings.System.getInt(getContentResolver(), Settings.System.LOCK_TO_APP_ENABLED)
+                != 0;
+        } catch (SettingNotFoundException e) {
+            return false;
+        }
+    }
+
+    private void setLockToAppEnabled(boolean isEnabled) {
+        Settings.System.putInt(getContentResolver(), Settings.System.LOCK_TO_APP_ENABLED,
+                isEnabled ? 1 : 0);
+    }
+
+    /**
+     * Listens to the state change of the lock-to-app master switch.
+     */
+    @Override
+    public void onSwitchChanged(Switch switchView, boolean isChecked) {
+        setLockToAppEnabled(isChecked);
+    }
+
+    /**
+     * For search
+     */
+    public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+        new BaseSearchIndexProvider() {
+            @Override
+            public List<SearchIndexableRaw> getRawDataToIndex(Context context, boolean enabled) {
+                final List<SearchIndexableRaw> result = new ArrayList<SearchIndexableRaw>();
+
+                final Resources res = context.getResources();
+
+                // Add fragment title
+                SearchIndexableRaw data = new SearchIndexableRaw(context);
+                data.title = res.getString(R.string.screen_pinning_title);
+                data.screenTitle = res.getString(R.string.screen_pinning_title);
+                result.add(data);
+
+                // Screen pinning description.
+                data = new SearchIndexableRaw(context);
+                data.title = res.getString(R.string.screen_pinning_description);
+                data.screenTitle = res.getString(R.string.screen_pinning_title);
+                result.add(data);
+
+                return result;
+            }
+        };
+}