Add plugin to swap out recents

Adds new mechanism for activities in sysui to be replaced by plugins
and allows that to happen for recents.

Test: runtest systemui
Change-Id: I8b570ce7c57484c58a52afe5e247d24ebfa0c57f
diff --git a/packages/SystemUI/src/com/android/systemui/Dependency.java b/packages/SystemUI/src/com/android/systemui/Dependency.java
index 1b694b3..bb44123 100644
--- a/packages/SystemUI/src/com/android/systemui/Dependency.java
+++ b/packages/SystemUI/src/com/android/systemui/Dependency.java
@@ -31,6 +31,7 @@
 import com.android.systemui.colorextraction.SysuiColorExtractor;
 import com.android.systemui.fragments.FragmentService;
 import com.android.systemui.plugins.ActivityStarter;
+import com.android.systemui.plugins.PluginActivityManager;
 import com.android.systemui.plugins.PluginDependencyProvider;
 import com.android.systemui.plugins.PluginManager;
 import com.android.systemui.plugins.PluginManagerImpl;
@@ -276,6 +277,9 @@
 
         mProviders.put(UiOffloadThread.class, UiOffloadThread::new);
 
+        mProviders.put(PluginActivityManager.class,
+                () -> new PluginActivityManager(mContext, getDependency(PluginManager.class)));
+
         // Put all dependencies above here so the factory can override them if it wants.
         SystemUIFactory.getInstance().injectDependencies(mProviders, mContext);
     }
diff --git a/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java b/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java
index 4a45997..fe6eb4b 100644
--- a/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java
+++ b/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java
@@ -16,6 +16,7 @@
 
 package com.android.systemui;
 
+import android.app.Activity;
 import android.app.ActivityThread;
 import android.app.Application;
 import android.content.BroadcastReceiver;
@@ -39,6 +40,7 @@
 import com.android.systemui.plugins.GlobalActions;
 import com.android.systemui.plugins.OverlayPlugin;
 import com.android.systemui.plugins.Plugin;
+import com.android.systemui.plugins.PluginActivityManager;
 import com.android.systemui.plugins.PluginListener;
 import com.android.systemui.plugins.PluginManager;
 import com.android.systemui.power.PowerUI;
@@ -266,4 +268,10 @@
     public SystemUI[] getServices() {
         return mServices;
     }
+
+    @Override
+    public Activity instantiateActivity(ClassLoader cl, String className, Intent intent) {
+        if (!mServicesStarted) return null;
+        return Dependency.get(PluginActivityManager.class).instantiate(cl, className, intent);
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/plugins/PluginActivityManager.java b/packages/SystemUI/src/com/android/systemui/plugins/PluginActivityManager.java
new file mode 100644
index 0000000..9becc38
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/plugins/PluginActivityManager.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2017 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;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.text.TextUtils;
+import android.util.ArrayMap;
+
+public class PluginActivityManager {
+
+    private final Context mContext;
+    private final PluginManager mPluginManager;
+    private final ArrayMap<String, String> mActionLookup = new ArrayMap<>();
+
+    public PluginActivityManager(Context context, PluginManager pluginManager) {
+        mContext = context;
+        mPluginManager = pluginManager;
+    }
+
+    public void addActivityPlugin(String className, String action) {
+        mActionLookup.put(className, action);
+    }
+
+    public Activity instantiate(ClassLoader cl, String className, Intent intent) {
+        String action = mActionLookup.get(className);
+        if (TextUtils.isEmpty(action)) return null;
+        return mPluginManager.getOneShotPlugin(action, PluginActivity.class);
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/plugins/PluginManagerImpl.java b/packages/SystemUI/src/com/android/systemui/plugins/PluginManagerImpl.java
index 493d244..a968399 100644
--- a/packages/SystemUI/src/com/android/systemui/plugins/PluginManagerImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/plugins/PluginManagerImpl.java
@@ -42,7 +42,6 @@
 import com.android.internal.messages.nano.SystemMessageProto.SystemMessage;
 import com.android.systemui.Dependency;
 import com.android.systemui.plugins.PluginInstanceManager.PluginContextWrapper;
-import com.android.systemui.plugins.PluginInstanceManager.PluginInfo;
 import com.android.systemui.plugins.annotations.ProvidesInterface;
 
 import dalvik.system.PathClassLoader;
@@ -120,14 +119,21 @@
         }
         PluginInstanceManager<T> p = mFactory.createPluginInstanceManager(mContext, action, null,
                 false, mLooper, cls, this);
+        PluginListener<Plugin> listener = new PluginListener<Plugin>() {
+            @Override
+            public void onPluginConnected(Plugin plugin, Context pluginContext) { }
+        };
+        mPluginMap.put(listener, p);
         mPluginPrefs.addAction(action);
-        PluginInfo<T> info = p.getPlugin();
+        PluginInstanceManager.PluginInfo<T> info = p.getPlugin();
         if (info != null) {
             mOneShotPackages.add(info.mPackage);
             mHasOneShot = true;
             startListening();
+            mPluginMap.remove(listener);
             return info.mPlugin;
         }
+        mPluginMap.remove(listener);
         return null;
     }
 
diff --git a/packages/SystemUI/src/com/android/systemui/recents/Recents.java b/packages/SystemUI/src/com/android/systemui/recents/Recents.java
index 9ba32b3..de2ace4 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/Recents.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/Recents.java
@@ -43,11 +43,14 @@
 
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+import com.android.systemui.Dependency;
 import com.android.systemui.EventLogConstants;
 import com.android.systemui.EventLogTags;
 import com.android.systemui.R;
 import com.android.systemui.RecentsComponent;
 import com.android.systemui.SystemUI;
+import com.android.systemui.plugins.PluginActivity;
+import com.android.systemui.plugins.PluginActivityManager;
 import com.android.systemui.recents.events.EventBus;
 import com.android.systemui.recents.events.activity.ConfigurationChangedEvent;
 import com.android.systemui.recents.events.activity.DockedTopTaskEvent;
@@ -234,6 +237,8 @@
             registerWithSystemUser();
         }
         putComponent(Recents.class, this);
+        Dependency.get(PluginActivityManager.class).addActivityPlugin(RecentsImpl.RECENTS_ACTIVITY,
+                PluginActivity.ACTION_RECENTS);
     }
 
     @Override