Add plugin support

- Add libs/plugin_core.jar
- Include plugin_core in Launcher3 build (it is already present other
  builds as part of the updated shared lib)
- Add PluginEnablerImpl that uses SharedPrefs to enable/disable plugin
  components
- Add src_plugins, where plugin interfaces will live. It has a build
  rule to create a jar that plugin projects will depend on.
- Copy PluginPreferencesFragment from sysui but using our implementation
  for PluginEnabler

Bug: 115877296
Change-Id: I3db54677eaceb10f92018c0f9d18920ad9ffac39

10 files changed, 477 insertions, 0 deletions

diff --git a/Android.mk b/Android.mk
index 727c541c4..b8e6c858f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -28,6 +28,35 @@ LOCAL_UNINSTALLABLE_MODULE := true
 LOCAL_SDK_VERSION := current
 include $(BUILD_PREBUILT)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := libPluginCore
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := JAVA_LIBRARIES
+LOCAL_SRC_FILES := libs/plugin_core.jar
+LOCAL_UNINSTALLABLE_MODULE := true
+LOCAL_SDK_VERSION := current
+include $(BUILD_PREBUILT)
+
+#
+# Build rule for plugin lib (needed to write a plugin).
+#
+include $(CLEAR_VARS)
+LOCAL_USE_AAPT2 := true
+LOCAL_AAPT2_ONLY := true
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_STATIC_JAVA_LIBRARIES := libPluginCore
+
+LOCAL_SRC_FILES := \
+    $(call all-java-files-under, src_plugins)
+
+LOCAL_SDK_VERSION := current
+LOCAL_MIN_SDK_VERSION := 28
+LOCAL_MODULE := LauncherPluginLib
+LOCAL_PRIVILEGED_MODULE := true
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
 #
 # Build rule for Launcher3 dependencies lib.
 #
@@ -40,6 +69,8 @@ LOCAL_STATIC_ANDROID_LIBRARIES := \
     androidx.recyclerview_recyclerview \
     androidx.dynamicanimation_dynamicanimation
 
+LOCAL_STATIC_JAVA_LIBRARIES := libPluginCore
+
 LOCAL_SRC_FILES := \
     $(call all-proto-files-under, protos) \
     $(call all-proto-files-under, proto_overrides)
diff --git a/libs/plugin_core.jar b/libs/plugin_core.jar
new file mode 100644
index 000000000..dd27f86fa
--- /dev/null
+++ b/libs/plugin_core.jar
diff --git a/quickstep/libs/sysui_shared.jar b/quickstep/libs/sysui_shared.jar
index 7ff664d41..c5a7c051e 100644
--- a/quickstep/libs/sysui_shared.jar
+++ b/quickstep/libs/sysui_shared.jar
diff --git a/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginEnablerImpl.java b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginEnablerImpl.java
new file mode 100644
index 000000000..e9fac26bd
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginEnablerImpl.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2018 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.launcher3.uioverrides.plugins;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import com.android.launcher3.Utilities;
+import com.android.systemui.shared.plugins.PluginEnabler;
+
+public class PluginEnablerImpl implements PluginEnabler {
+
+    final private SharedPreferences mSharedPrefs;
+
+    public PluginEnablerImpl(Context context) {
+        mSharedPrefs = Utilities.getDevicePrefs(context);
+    }
+
+    @Override
+    public void setEnabled(ComponentName component, boolean enabled) {
+        mSharedPrefs.edit().putBoolean(toPrefString(component), enabled).apply();
+    }
+
+    @Override
+    public boolean isEnabled(ComponentName component) {
+        return mSharedPrefs.getBoolean(toPrefString(component), true);
+    }
+
+    private String toPrefString(ComponentName component) {
+        return "PLUGIN_ENABLED_" + component.flattenToString();
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginInitializerImpl.java b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginInitializerImpl.java
new file mode 100644
index 000000000..8a6aa050c
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginInitializerImpl.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2018 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.launcher3.uioverrides.plugins;
+
+import android.content.Context;
+import android.os.Looper;
+
+import com.android.launcher3.LauncherModel;
+import com.android.systemui.shared.plugins.PluginEnabler;
+import com.android.systemui.shared.plugins.PluginInitializer;
+
+public class PluginInitializerImpl implements PluginInitializer {
+    @Override
+    public Looper getBgLooper() {
+        return LauncherModel.getWorkerLooper();
+    }
+
+    @Override
+    public void onPluginManagerInit() {
+    }
+
+    @Override
+    public String[] getWhitelistedPlugins(Context context) {
+        return new String[0];
+    }
+
+    @Override
+    public PluginEnabler getPluginEnabler(Context context) {
+        return new PluginEnablerImpl(context);
+    }
+
+    @Override
+    public void handleWtfs() {
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginManagerWrapper.java b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginManagerWrapper.java
new file mode 100644
index 000000000..ca12951c7
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginManagerWrapper.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2018 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.launcher3.uioverrides.plugins;
+
+import android.content.Context;
+
+import com.android.launcher3.util.MainThreadInitializedObject;
+import com.android.systemui.plugins.Plugin;
+import com.android.systemui.plugins.PluginListener;
+import com.android.systemui.shared.plugins.PluginEnabler;
+import com.android.systemui.shared.plugins.PluginInitializer;
+import com.android.systemui.shared.plugins.PluginManager;
+import com.android.systemui.shared.plugins.PluginManagerImpl;
+
+public class PluginManagerWrapper {
+
+    public static final MainThreadInitializedObject<PluginManagerWrapper> INSTANCE =
+            new MainThreadInitializedObject<>(PluginManagerWrapper::new);
+
+    private final PluginManager mPluginManager;
+    private final PluginEnabler mPluginEnabler;
+
+    private PluginManagerWrapper(Context c) {
+        PluginInitializer pluginInitializer  = new PluginInitializerImpl();
+        mPluginManager = new PluginManagerImpl(c, pluginInitializer);
+        mPluginEnabler = pluginInitializer.getPluginEnabler(c);
+    }
+
+    PluginEnabler getPluginEnabler() {
+        return mPluginEnabler;
+    }
+
+    public void addPluginListener(PluginListener<? extends Plugin> listener, Class<?> pluginClass) {
+        mPluginManager.addPluginListener(listener, pluginClass);
+    }
+
+    public void removePluginListener(PluginListener<? extends Plugin> listener) {
+        mPluginManager.removePluginListener(listener);
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginPreferencesFragment.java b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginPreferencesFragment.java
new file mode 100644
index 000000000..3da4f8427
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/plugins/PluginPreferencesFragment.java
@@ -0,0 +1,217 @@
+/*
+ * Copyright (C) 2018 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.launcher3.uioverrides.plugins;
+
+import android.content.BroadcastReceiver;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.net.Uri;
+import android.os.Bundle;
+import android.preference.PreferenceFragment;
+import android.preference.PreferenceScreen;
+import android.preference.SwitchPreference;
+import android.provider.Settings;
+import android.util.ArrayMap;
+import android.util.ArraySet;
+import android.view.View;
+
+import com.android.launcher3.R;
+import com.android.systemui.shared.plugins.PluginEnabler;
+import com.android.systemui.shared.plugins.PluginManager;
+import com.android.systemui.shared.plugins.PluginPrefs;
+
+import java.util.List;
+import java.util.Set;
+
+/**
+ * This class is copied from System UI Tuner, except using our PluginEnablerImpl. The reason we
+ * can't share a common base class in the shared lib is because the androidx preference dependency
+ * interferes with our recyclerview and fragment dependencies.
+ */
+public class PluginPreferencesFragment extends PreferenceFragment {
+    public static final String ACTION_PLUGIN_SETTINGS
+            = "com.android.systemui.action.PLUGIN_SETTINGS";
+
+    private static final String PLUGIN_PERMISSION = "com.android.systemui.permission.PLUGIN";
+
+    private PluginPrefs mPluginPrefs;
+    private PluginEnabler mPluginEnabler;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
+        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
+        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
+        filter.addDataScheme("package");
+        getContext().registerReceiver(mReceiver, filter);
+        filter = new IntentFilter(Intent.ACTION_USER_UNLOCKED);
+        getContext().registerReceiver(mReceiver, filter);
+
+        mPluginEnabler = PluginManagerWrapper.INSTANCE.get(getContext()).getPluginEnabler();
+        loadPrefs();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        getContext().unregisterReceiver(mReceiver);
+    }
+
+    private void loadPrefs() {
+        PreferenceScreen screen = getPreferenceManager().createPreferenceScreen(getContext());
+        screen.setOrderingAsAdded(false);
+        Context prefContext = getContext();
+        mPluginPrefs = new PluginPrefs(getContext());
+        PackageManager pm = getContext().getPackageManager();
+
+        Set<String> pluginActions = mPluginPrefs.getPluginList();
+        ArrayMap<String, ArraySet<String>> plugins = new ArrayMap<>();
+        for (String action : pluginActions) {
+            String name = toName(action);
+            List<ResolveInfo> result = pm.queryIntentServices(
+                    new Intent(action), PackageManager.MATCH_DISABLED_COMPONENTS);
+            for (ResolveInfo info : result) {
+                String packageName = info.serviceInfo.packageName;
+                if (!plugins.containsKey(packageName)) {
+                    plugins.put(packageName, new ArraySet<>());
+                }
+                plugins.get(packageName).add(name);
+            }
+        }
+
+        List<PackageInfo> apps = pm.getPackagesHoldingPermissions(new String[]{PLUGIN_PERMISSION},
+                PackageManager.MATCH_DISABLED_COMPONENTS | PackageManager.GET_SERVICES);
+        apps.forEach(app -> {
+            if (!plugins.containsKey(app.packageName)) return;
+            SwitchPreference pref = new PluginPreference(prefContext, app, mPluginEnabler);
+            pref.setSummary("Plugins: " + toString(plugins.get(app.packageName)));
+            screen.addPreference(pref);
+        });
+        setPreferenceScreen(screen);
+    }
+
+    private String toString(ArraySet<String> plugins) {
+        StringBuilder b = new StringBuilder();
+        for (String string : plugins) {
+            if (b.length() != 0) {
+                b.append(", ");
+            }
+            b.append(string);
+        }
+        return b.toString();
+    }
+
+    private String toName(String action) {
+        String str = action.replace("com.android.systemui.action.PLUGIN_", "");
+        StringBuilder b = new StringBuilder();
+        for (String s : str.split("_")) {
+            if (b.length() != 0) {
+                b.append(' ');
+            }
+            b.append(s.substring(0, 1));
+            b.append(s.substring(1).toLowerCase());
+        }
+        return b.toString();
+    }
+
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            loadPrefs();
+        }
+    };
+
+    private static class PluginPreference extends SwitchPreference {
+        private final boolean mHasSettings;
+        private final PackageInfo mInfo;
+        private final PluginEnabler mPluginEnabler;
+
+        public PluginPreference(Context prefContext, PackageInfo info, PluginEnabler pluginEnabler) {
+            super(prefContext);
+            PackageManager pm = prefContext.getPackageManager();
+            mHasSettings = pm.resolveActivity(new Intent(ACTION_PLUGIN_SETTINGS)
+                    .setPackage(info.packageName), 0) != null;
+            mInfo = info;
+            mPluginEnabler = pluginEnabler;
+            setTitle(info.applicationInfo.loadLabel(pm));
+            setChecked(isPluginEnabled());
+            setWidgetLayoutResource(R.layout.switch_preference_with_settings);
+        }
+
+        private boolean isPluginEnabled() {
+            for (int i = 0; i < mInfo.services.length; i++) {
+                ComponentName componentName = new ComponentName(mInfo.packageName,
+                        mInfo.services[i].name);
+                if (!mPluginEnabler.isEnabled(componentName)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        @Override
+        protected boolean persistBoolean(boolean isEnabled) {
+            boolean shouldSendBroadcast = false;
+            for (int i = 0; i < mInfo.services.length; i++) {
+                ComponentName componentName = new ComponentName(mInfo.packageName,
+                        mInfo.services[i].name);
+
+                if (mPluginEnabler.isEnabled(componentName) != isEnabled) {
+                    mPluginEnabler.setEnabled(componentName, isEnabled);
+                    shouldSendBroadcast = true;
+                }
+            }
+            if (shouldSendBroadcast) {
+                final String pkg = mInfo.packageName;
+                final Intent intent = new Intent(PluginManager.PLUGIN_CHANGED,
+                        pkg != null ? Uri.fromParts("package", pkg, null) : null);
+                getContext().sendBroadcast(intent);
+            }
+            setChecked(isEnabled);
+            return true;
+        }
+
+        @Override
+        protected void onBindView(View view) {
+            super.onBindView(view);
+            view.findViewById(R.id.settings).setVisibility(mHasSettings ? View.VISIBLE
+                    : View.GONE);
+            view.findViewById(R.id.divider).setVisibility(mHasSettings ? View.VISIBLE
+                    : View.GONE);
+            view.findViewById(R.id.settings).setOnClickListener(v -> {
+                ResolveInfo result = v.getContext().getPackageManager().resolveActivity(
+                        new Intent(ACTION_PLUGIN_SETTINGS).setPackage(
+                                mInfo.packageName), 0);
+                if (result != null) {
+                    v.getContext().startActivity(new Intent().setComponent(
+                            new ComponentName(result.activityInfo.packageName,
+                                    result.activityInfo.name)));
+                }
+            });
+            view.setOnLongClickListener(v -> {
+                Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+                intent.setData(Uri.fromParts("package", mInfo.packageName, null));
+                getContext().startActivity(intent);
+                return true;
+            });
+        }
+    }
+}
diff --git a/res/layout/switch_preference_with_settings.xml b/res/layout/switch_preference_with_settings.xml
new file mode 100644
index 000000000..d3195610d
--- /dev/null
+++ b/res/layout/switch_preference_with_settings.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:gravity="center_vertical">
+
+    <ImageView
+        android:id="@+id/settings"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:src="@drawable/ic_setting"
+        android:tint="@android:color/black"
+        android:padding="12dp"
+        android:background="?android:attr/selectableItemBackgroundBorderless" />
+
+    <View
+        android:id="@+id/divider"
+        android:layout_width="1dp"
+        android:layout_height="30dp"
+        android:layout_marginEnd="8dp"
+        android:background="?android:attr/listDivider" />
+
+    <!-- Note: seems we need focusable="false" and clickable="false" when moving to androidx -->
+    <Switch
+        android:id="@android:id/switch_widget"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:background="@null" />
+</LinearLayout>
\ No newline at end of file
diff --git a/src_plugins/README.md b/src_plugins/README.md
new file mode 100644
index 000000000..c7ce1daca
--- /dev/null
+++ b/src_plugins/README.md
@@ -0,0 +1,3 @@
+This directory contains plugin interfaces that launcher listens for and plugins implement. In other words, these are the hooks that specify what plugins launcher currently supports. 
+
+Details about how to create a new plugin interface, or to use existing interfaces to write a plugin can be found at go/gnl/plugins.
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/plugins/PluginManagerWrapper.java b/src_ui_overrides/com/android/launcher3/uioverrides/plugins/PluginManagerWrapper.java
new file mode 100644
index 000000000..fcb2abe3e
--- /dev/null
+++ b/src_ui_overrides/com/android/launcher3/uioverrides/plugins/PluginManagerWrapper.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2018 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.launcher3.uioverrides.plugins;
+
+import android.content.Context;
+
+import com.android.launcher3.util.MainThreadInitializedObject;
+import com.android.systemui.plugins.Plugin;
+import com.android.systemui.plugins.PluginListener;
+
+public class PluginManagerWrapper {
+
+    public static final MainThreadInitializedObject<PluginManagerWrapper> INSTANCE =
+            new MainThreadInitializedObject<>(PluginManagerWrapper::new);
+
+    private PluginManagerWrapper(Context c) {
+    }
+
+    public void addPluginListener(PluginListener<? extends Plugin> listener, Class<?> pluginClass) {
+    }
+
+    public void removePluginListener(PluginListener<? extends Plugin> listener) {
+    }
+}