Added "No recent apps" message on phones

Change-Id: I00bf163369775b79377090b7a9dae0c94ce5d0ac

6 files changed, 84 insertions, 4 deletions

diff --git a/packages/SystemUI/res/layout-land/status_bar_recent_panel.xml b/packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
index f84cc19..2fe22ff 100644
--- a/packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
+++ b/packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
@@ -69,6 +69,12 @@
 
     </FrameLayout>
 
+    <include layout="@layout/status_bar_no_recent_apps"
+        android:id="@+id/recents_no_apps"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="invisible" />
+
     <View android:id="@+id/recents_dismiss_button"
         android:layout_width="80px"
         android:layout_height="@*android:dimen/status_bar_height"
diff --git a/packages/SystemUI/res/layout-port/status_bar_recent_panel.xml b/packages/SystemUI/res/layout-port/status_bar_recent_panel.xml
index ed9ea7a..4d49077 100644
--- a/packages/SystemUI/res/layout-port/status_bar_recent_panel.xml
+++ b/packages/SystemUI/res/layout-port/status_bar_recent_panel.xml
@@ -67,6 +67,12 @@
 
     </FrameLayout>
 
+    <include layout="@layout/status_bar_no_recent_apps"
+        android:id="@+id/recents_no_apps"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="invisible" />
+
     <View android:id="@+id/recents_dismiss_button"
         android:layout_width="80px"
         android:layout_height="@*android:dimen/status_bar_height"
diff --git a/packages/SystemUI/res/layout/status_bar_no_recent_apps.xml b/packages/SystemUI/res/layout/status_bar_no_recent_apps.xml
new file mode 100644
index 0000000..47ffb83
--- /dev/null
+++ b/packages/SystemUI/res/layout/status_bar_no_recent_apps.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/* apps/common/assets/default/default/skins/StatusBar.xml
+**
+** Copyright 2011, 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.
+*/
+-->
+
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_height="match_parent"
+    android:layout_width="match_parent"
+    >
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textSize="24dp"
+        android:textColor="#ffffffff"
+        android:text="@string/status_bar_no_recent_apps"
+        android:gravity="center_horizontal"
+        android:layout_gravity="center"
+    />
+</FrameLayout>
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index bad7e1f..b9e6d78 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -41,6 +41,10 @@
     <!-- Title shown in recents popup for inspecting an application's properties -->
     <string name="status_bar_recent_inspect_item_title">App info</string>
 
+    <!-- Message shown in the middle of the screen after clicking on the recent apps button
+         when there are no recent apps to show [CHAR LIMIT=45]-->
+    <string name="status_bar_no_recent_apps">No recent apps</string>
+
     <!-- The label in the bar at the top of the status bar when there are no notifications
          showing.  [CHAR LIMIT=40]-->
     <string name="status_bar_no_notifications_title">No notifications</string>
diff --git a/packages/SystemUI/src/com/android/systemui/recent/Choreographer.java b/packages/SystemUI/src/com/android/systemui/recent/Choreographer.java
index 9749a1d..fbf00d2 100644
--- a/packages/SystemUI/src/com/android/systemui/recent/Choreographer.java
+++ b/packages/SystemUI/src/com/android/systemui/recent/Choreographer.java
@@ -38,17 +38,20 @@ import android.view.View;
     View mRootView;
     View mScrimView;
     View mContentView;
+    View mNoRecentAppsView;
     AnimatorSet mContentAnim;
     Animator.AnimatorListener mListener;
 
     // the panel will start to appear this many px from the end
     final int HYPERSPACE_OFFRAMP = 200;
 
-    public Choreographer(View root, View scrim, View content, Animator.AnimatorListener listener) {
+    public Choreographer(View root, View scrim, View content,
+            View noRecentApps, Animator.AnimatorListener listener) {
         mRootView = root;
         mScrimView = scrim;
         mContentView = content;
         mListener = listener;
+        mNoRecentAppsView = noRecentApps;
     }
 
     void createAnimation(boolean appearing) {
@@ -81,8 +84,24 @@ import android.view.View;
                 : new android.view.animation.DecelerateInterpolator(1.0f));
         glowAnim.setDuration(appearing ? OPEN_DURATION : CLOSE_DURATION);
 
+        Animator noRecentAppsFadeAnim = null;
+        if (mNoRecentAppsView != null &&  // doesn't exist on large devices
+                mNoRecentAppsView.getVisibility() == View.VISIBLE) {
+            noRecentAppsFadeAnim = ObjectAnimator.ofFloat(mNoRecentAppsView, "alpha",
+                    mContentView.getAlpha(), appearing ? 1.0f : 0.0f);
+            noRecentAppsFadeAnim.setInterpolator(appearing
+                    ? new android.view.animation.AccelerateInterpolator(1.0f)
+                    : new android.view.animation.DecelerateInterpolator(1.0f));
+            noRecentAppsFadeAnim.setDuration(appearing ? OPEN_DURATION : CLOSE_DURATION);
+        }
+
         mContentAnim = new AnimatorSet();
         final Builder builder = mContentAnim.play(glowAnim).with(posAnim);
+
+        if (noRecentAppsFadeAnim != null) {
+            builder.with(noRecentAppsFadeAnim);
+        }
+
         Drawable background = mScrimView.getBackground();
         if (background != null) {
             Animator bgAnim = ObjectAnimator.ofInt(background,
diff --git a/packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java b/packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java
index 0621b22..6fdc534 100644
--- a/packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java
@@ -83,6 +83,7 @@ public class RecentsPanelView extends RelativeLayout
     private int mIconDpi;
     private View mRecentsScrim;
     private View mRecentsGlowView;
+    private View mRecentsNoApps;
     private ViewGroup mRecentsContainer;
     private Bitmap mDefaultThumbnailBackground;
 
@@ -373,8 +374,9 @@ public class RecentsPanelView extends RelativeLayout
 
 
         mRecentsGlowView = findViewById(R.id.recents_glow);
-        mRecentsScrim = (View) findViewById(R.id.recents_bg_protect);
-        mChoreo = new Choreographer(this, mRecentsScrim, mRecentsGlowView, this);
+        mRecentsScrim = findViewById(R.id.recents_bg_protect);
+        mRecentsNoApps = findViewById(R.id.recents_no_apps);
+        mChoreo = new Choreographer(this, mRecentsScrim, mRecentsGlowView, mRecentsNoApps, this);
         mRecentsDismissButton = findViewById(R.id.recents_dismiss_button);
         mRecentsDismissButton.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
@@ -581,6 +583,9 @@ public class RecentsPanelView extends RelativeLayout
             mThumbnailLoader.cancel(false);
             mThumbnailLoader = null;
         }
+        if (mRecentsNoApps != null) { // doesn't exist on large devices
+            mRecentsNoApps.setVisibility(View.INVISIBLE);
+        }
         mActivityDescriptions = getRecentTasks();
         for (ActivityDescription ad : mActivityDescriptions) {
             ad.setThumbnail(mDefaultThumbnailBackground);
@@ -647,7 +652,11 @@ public class RecentsPanelView extends RelativeLayout
         } else {
             // Immediately hide this panel
             if (DEBUG) Log.v(TAG, "Nothing to show");
-            hide(false);
+            if (mRecentsNoApps != null) { // doesn't exist on large devices
+                mRecentsNoApps.setVisibility(View.VISIBLE);
+            } else {
+                hide(false);
+            }
         }
     }