From 814e1f51e620a4ee99a48ecee0cb4d0bc7374c83 Mon Sep 17 00:00:00 2001
From: Simon Dubray <simonx.dubray@intel.com>
Date: Thu, 5 Nov 2015 11:38:40 +0100
Subject: [PATCH] Chronometer: Update the value only if displayed on screen

Chronometer is refreshed every second even if not displayed
on the screen and if the screen is off.

Change-Id: I9348c4f988b6822f2c7d9cac0e47acaf82a02e01
Signed-off-by: Simon Dubray <simonx.dubray@intel.com>
Signed-off-by: Zhiquan Liu <zhiquan.liu@intel.com>
---
 core/java/android/widget/Chronometer.java | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/core/java/android/widget/Chronometer.java b/core/java/android/widget/Chronometer.java
index ebb54ff39d06e..151326449011c 100644
--- a/core/java/android/widget/Chronometer.java
+++ b/core/java/android/widget/Chronometer.java
@@ -25,6 +25,7 @@ import android.os.SystemClock;
 import android.text.format.DateUtils;
 import android.util.AttributeSet;
 import android.util.Log;
+import android.view.View;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.RemoteViews.RemoteView;
 
@@ -226,6 +227,12 @@ public class Chronometer extends TextView {
         updateRunning();
     }
 
+    @Override
+    protected void onVisibilityChanged(View changedView, int visibility) {
+        super.onVisibilityChanged(changedView, visibility);
+        updateRunning();
+    }
+
     private synchronized void updateText(long now) {
         mNow = now;
         long seconds = now - mBase;
@@ -254,7 +261,7 @@ public class Chronometer extends TextView {
     }
 
     private void updateRunning() {
-        boolean running = mVisible && mStarted;
+        boolean running = mVisible && mStarted && isShown();
         if (running != mRunning) {
             if (running) {
                 updateText(SystemClock.elapsedRealtime());