Add PluginInflateContainer

PluginInflateContainer extends AutoReinflateContainer, except that
it also uses the plugin interface to allow the view to be swapped
out with something else.

Define an interface or abstract class as follows that includes the
version and action.

public interface MyInterface {
    public static final String ACTION =
            "com.android.systemui.action.PLUGIN_MYINTERFACE";

    public static final int VERSION = 1;

    void myImportantInterface();
}

Then put in a PluginInflateContainer to use and specify the interface
or class that will be implemented as viewType.  The layout specified
will be used by default and whenever a plugin is not present.

<com.android.systemui.PluginInflateContainer
    android:id="@+id/some_id"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout="@layout/my_default_component"
    systemui:viewType="com.android.systemui.plugins.MyInterface" />

Test: Manual
Change-Id: I2ef3fa8dbe344c4635df20056182c1c0b3846fdf

4 files changed, 142 insertions, 2 deletions

diff --git a/packages/SystemUI/plugin/src/com/android/systemui/plugins/ViewProvider.java b/packages/SystemUI/plugin/src/com/android/systemui/plugins/ViewProvider.java
new file mode 100644
index 000000000000..18ca8e6e26a6
--- /dev/null
+++ b/packages/SystemUI/plugin/src/com/android/systemui/plugins/ViewProvider.java
@@ -0,0 +1,21 @@
+/*
+ * 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;
+
+import android.view.View;
+
+public interface ViewProvider extends Plugin {
+    View getView();
+}
diff --git a/packages/SystemUI/res/values/attrs.xml b/packages/SystemUI/res/values/attrs.xml
index cbaf23f85fdc..ad65f82ab956 100644
--- a/packages/SystemUI/res/values/attrs.xml
+++ b/packages/SystemUI/res/values/attrs.xml
@@ -108,5 +108,9 @@
         <attr name="enableAutoSizing" format="boolean" />
         <attr name="itemHeight" format="dimension" />
     </declare-styleable>
+
+    <declare-styleable name="PluginInflateContainer">
+        <attr name="viewType" format="string" />
+    </declare-styleable>
 </resources>
 
diff --git a/packages/SystemUI/src/com/android/systemui/AutoReinflateContainer.java b/packages/SystemUI/src/com/android/systemui/AutoReinflateContainer.java
index 2aca7889f31b..810dd8c403a7 100644
--- a/packages/SystemUI/src/com/android/systemui/AutoReinflateContainer.java
+++ b/packages/SystemUI/src/com/android/systemui/AutoReinflateContainer.java
@@ -72,9 +72,13 @@ public class AutoReinflateContainer extends FrameLayout {
         }
     }
 
-    private void inflateLayout() {
-        removeAllViews();
+    protected void inflateLayoutImpl() {
         LayoutInflater.from(getContext()).inflate(mLayout, this);
+    }
+
+    protected void inflateLayout() {
+        removeAllViews();
+        inflateLayoutImpl();
         final int N = mInflateListeners.size();
         for (int i = 0; i < N; i++) {
             mInflateListeners.get(i).onInflated(getChildAt(0));
diff --git a/packages/SystemUI/src/com/android/systemui/PluginInflateContainer.java b/packages/SystemUI/src/com/android/systemui/PluginInflateContainer.java
new file mode 100644
index 000000000000..efa7cae0821d
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/PluginInflateContainer.java
@@ -0,0 +1,111 @@
+/*
+ * 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;
+
+import android.annotation.Nullable;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+
+import com.android.systemui.plugins.PluginListener;
+import com.android.systemui.plugins.PluginManager;
+import com.android.systemui.plugins.ViewProvider;
+
+/**
+ * Define an interface or abstract class as follows that includes the
+ * version and action.
+ *
+ * public interface MyInterface {
+ *     public static final String ACTION =
+ *             "com.android.systemui.action.PLUGIN_MYINTERFACE";
+ *
+ *     public static final int VERSION = 1;
+ *
+ *     void myImportantInterface();
+ * }
+ *
+ * Then put in a PluginInflateContainer to use and specify the interface
+ * or class that will be implemented as viewType.  The layout specified
+ * will be used by default and whenever a plugin is not present.
+ *
+ * <com.android.systemui.PluginInflateContainer
+ *     android:id="@+id/some_id"
+ *     android:layout_width="match_parent"
+ *     android:layout_height="match_parent"
+ *     android:layout="@layout/my_default_component"
+ *     systemui:viewType="com.android.systemui.plugins.MyInterface" />
+ */
+public class PluginInflateContainer extends AutoReinflateContainer
+        implements PluginListener<ViewProvider> {
+
+    private static final String TAG = "PluginInflateContainer";
+
+    private String mAction;
+    private int mVersion;
+    private View mPluginView;
+
+    public PluginInflateContainer(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PluginInflateContainer);
+        String viewType = a.getString(R.styleable.PluginInflateContainer_viewType);
+        try {
+            Class c = Class.forName(viewType);
+            mAction = (String) c.getDeclaredField("ACTION").get(null);
+            mVersion = (int) c.getDeclaredField("VERSION").get(null);
+        } catch (Exception e) {
+            Log.d(TAG, "Problem getting class info " + viewType, e);
+            mAction = null;
+            mVersion = 0;
+        }
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        if (mAction != null) {
+            PluginManager.getInstance(getContext()).addPluginListener(mAction, this, mVersion);
+        }
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        if (mAction != null) {
+            PluginManager.getInstance(getContext()).removePluginListener(this);
+        }
+    }
+
+    @Override
+    protected void inflateLayoutImpl() {
+        if (mPluginView != null) {
+            addView(mPluginView);
+        } else {
+            super.inflateLayoutImpl();
+        }
+    }
+
+    @Override
+    public void onPluginConnected(ViewProvider plugin) {
+        mPluginView = plugin.getView();
+        inflateLayout();
+    }
+
+    @Override
+    public void onPluginDisconnected(ViewProvider plugin) {
+        mPluginView = null;
+        inflateLayout();
+    }
+}