Overflow activity scaffold, xml, manifest, style

Bug: 138116789
Test: manual - overflow compiles and works as expected in separate xl cl
Test: atest SystemUITests
Change-Id: I7142527442c01dca87c88fd6034af184df6f93d6

packages/SystemUI/AndroidManifest.xml

@@ -325,6 +325,14 @@
                 android:permission="android.permission.BIND_WALLPAPER"
                 android:exported="true" />
 
+        <activity
+            android:name=".bubbles.BubbleOverflowActivity"
+            android:theme="@style/BubbleOverflow"
+            android:excludeFromRecents="true"
+            android:documentLaunchMode="always"
+            android:resizeableActivity="true">
+        </activity>
+
         <activity android:name=".tuner.TunerActivity"
                   android:enabled="false"
                   android:icon="@drawable/tuner"

packages/SystemUI/res/layout/bubble_overflow_activity.xml

@@ -0,0 +1,20 @@
+<!--
+  ~ Copyright (C) 2019 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
+  -->
+<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/bubble_overflow_recycler"
+    android:scrollbars="vertical"
+    android:layout_width="wrap_content"
+    android:layout_height="match_parent"/>

packages/SystemUI/res/values/styles.xml

@@ -15,6 +15,7 @@
 -->
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
+    <style name="BubbleOverflow" parent="@android:style/Theme.NoTitleBar"></style>
 
     <style name="ClearAllButtonDefaultMargins">
         <item name="android:layout_marginStart">0dp</item>

packages/SystemUI/src/com/android/systemui/bubbles/BubbleOverflowActivity.java

@@ -0,0 +1,69 @@
+package com.android.systemui.bubbles;
+
+import android.app.Activity;
+import android.content.res.TypedArray;
+import android.graphics.Color;
+import android.os.Bundle;
+
+import androidx.recyclerview.widget.GridLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.android.systemui.R;
+
+/**
+ * Activity for showing aged out bubbles.
+ * Must be public to be accessible to androidx...AppComponentFactory
+ */
+public class BubbleOverflowActivity extends Activity {
+    private RecyclerView mRecyclerView;
+    private int mMaxBubbles;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.bubble_overflow_activity);
+        setBackgroundColor();
+
+        mMaxBubbles = getResources().getInteger(R.integer.bubbles_max_rendered);
+        mRecyclerView = findViewById(R.id.bubble_overflow_recycler);
+        mRecyclerView.setLayoutManager(
+                new GridLayoutManager(getApplicationContext(), /* numberOfColumns */ mMaxBubbles));
+    }
+
+    void setBackgroundColor() {
+        final TypedArray ta = getApplicationContext().obtainStyledAttributes(
+                new int[] {android.R.attr.colorBackgroundFloating});
+        int bgColor = ta.getColor(0, Color.WHITE);
+        ta.recycle();
+        findViewById(android.R.id.content).setBackgroundColor(bgColor);
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+    }
+
+    @Override
+    public void onRestart() {
+        super.onRestart();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+    }
+
+    public void onDestroy() {
+        super.onStop();
+    }
+}