Fix IndexOutOfBoundsException.

This fix resolves an exception thrown when the snapshot ArrayList has
no entries.

Fixes bug 6311207.

Change-Id: I84383417116a4a62eb2842792ed04096aebc8ee2

Author: Craig Mautner

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

@@ -2043,7 +2043,10 @@ public void onClick(View v) {
                         snapshot.add(child);
                     }
                 }
-                final int N = snapshot.size();
+                if (snapshot.isEmpty()) {
+                    animateCollapse(false);
+                    return;
+                }
                 new Thread(new Runnable() {
                     @Override
                     public void run() {
@@ -2059,6 +2062,7 @@ public void run() {
                         mPile.setViewRemoval(false);
 
                         mPostCollapseCleanup = new Runnable() {
+                            @Override
                             public void run() {
                                 try {
                                     mPile.setViewRemoval(true);
@@ -2069,9 +2073,8 @@ public void run() {
 
                         View sampleView = snapshot.get(0);
                         int width = sampleView.getWidth();
-                        final int velocity = (int)(width * 8); // 1000/8 = 125 ms duration
-                        for (View v : snapshot) {
-                            final View _v = v;
+                        final int velocity = width * 8; // 1000/8 = 125 ms duration
+                        for (final View _v : snapshot) {
                             mHandler.postDelayed(new Runnable() {
                                 @Override
                                 public void run() {
@@ -2087,6 +2090,7 @@ public void run() {
                         // synchronize the end of those animations with the start of the collaps
                         // exactly.
                         mHandler.postDelayed(new Runnable() {
+                            @Override
                             public void run() {
                                 animateCollapse(false);
                             }