Adding support for overlay and corresponding plugin to Launcher

Updating various task callbacks to handle overlays

Change-Id: I80077508ad35c31269c873f51f0105302a9e6a5d

src_plugins/com/android/systemui/plugins/shared/LauncherExterns.java

@@ -0,0 +1,49 @@
+/*
+ * 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.systemui.plugins.shared;
+
+import android.content.SharedPreferences;
+
+import com.android.systemui.plugins.shared.LauncherOverlayManager.LauncherOverlay;
+
+/**
+ * This interface defines the set of methods that the Launcher activity exposes. Methods
+ * here should be safe to call from classes outside of com.android.launcher3.*
+ */
+public interface LauncherExterns {
+
+    /**
+     * Returns the shared main preference
+     */
+    SharedPreferences getSharedPrefs();
+
+    /**
+     * Returns the device specific preference
+     */
+    SharedPreferences getDevicePrefs();
+
+    /**
+     * Sets the overlay on the target activity
+     */
+    void setLauncherOverlay(LauncherOverlay overlay);
+
+    /**
+     * Executes the command, next time the overlay is hidden
+     */
+    void runOnOverlayHidden(Runnable runnable);
+
+}