fix #3521: GPS would stay on after a cache list refresh

The previous fix for #3521 was incomplete and only reduced the time
window during which the GPS could be turned on in a race condition
(4c5ef68f45a2b35537b89f857c1aa9fcb117ae83).

This one prevents the GPS from being turned on again when the
activity is paused (which includes a dead activity as well if
the user has left).

1 files changed, 23 insertions, 0 deletions

diff --git a/main/src/cgeo/geocaching/activity/AbstractListActivity.java b/main/src/cgeo/geocaching/activity/AbstractListActivity.java
index a5d5c14..2adae7a 100644
--- a/main/src/cgeo/geocaching/activity/AbstractListActivity.java
+++ b/main/src/cgeo/geocaching/activity/AbstractListActivity.java
@@ -11,6 +11,7 @@ public abstract class AbstractListActivity extends FragmentListActivity implemen
         IAbstractActivity {
 
     private boolean keepScreenOn = false;
+    private boolean paused = true;
 
     protected CgeoApplication app = null;
     protected Resources res = null;
@@ -84,4 +85,26 @@ public abstract class AbstractListActivity extends FragmentListActivity implemen
         // initialize action bar title with activity title
         ActivityMixin.setTitle(this, getTitle());
     }
+
+    @Override
+    public void onResume() {
+        paused = false;
+        super.onResume();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        paused = true;
+    }
+
+    /**
+     * Check if the current activity is paused. This must be called and acted
+     * upon only from the UI thread.
+     *
+     * @return <code>true</code> if the current activity is paused
+     */
+    protected boolean isPaused() {
+        return paused;
+    }
 }