Developer QS tile: Show Layout.

Bug: 27872042
Change-Id: I0df2ffecbf7d2682d89c9b8343590bb04bcc305c

src/com/android/settings/DevelopmentSettings.java

@@ -2078,7 +2078,7 @@ public class DevelopmentSettings extends RestrictedSettingsFragment
         }
     };
 
-    static class SystemPropPoker extends AsyncTask<Void, Void, Void> {
+    public static class SystemPropPoker extends AsyncTask<Void, Void, Void> {
         @Override
         protected Void doInBackground(Void... params) {
             String[] services = ServiceManager.listServices();

src/com/android/settings/qstile/ShowLayout.java

@@ -0,0 +1,46 @@
+/*
+ * 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.qstile;
+
+import android.os.SystemProperties;
+import android.service.quicksettings.Tile;
+import android.service.quicksettings.TileService;
+import android.view.View;
+import com.android.settings.DevelopmentSettings;
+
+public class ShowLayout extends TileService {
+    @Override
+    public void onStartListening() {
+        super.onStartListening();
+        refresh();
+    }
+
+    public void refresh() {
+        getQsTile().setState(
+            SystemProperties.getBoolean(View.DEBUG_LAYOUT_PROPERTY, false)
+                ? Tile.STATE_ACTIVE : Tile.STATE_INACTIVE);
+        getQsTile().updateTile();
+    }
+
+    @Override
+    public void onClick() {
+        SystemProperties.set(View.DEBUG_LAYOUT_PROPERTY,
+                getQsTile().getState() == Tile.STATE_INACTIVE ? "true" : "false");
+        new DevelopmentSettings.SystemPropPoker().execute(); // Settings app magic
+        refresh();
+    }
+}