Synchronize access to Progress methods

This is part of #670.

1 files changed, 4 insertions, 4 deletions

diff --git a/main/src/cgeo/geocaching/activity/Progress.java b/main/src/cgeo/geocaching/activity/Progress.java
index d3f98be..28aaa66 100644
--- a/main/src/cgeo/geocaching/activity/Progress.java
+++ b/main/src/cgeo/geocaching/activity/Progress.java
@@ -10,26 +10,26 @@ public class Progress {
 
     private static ProgressDialog dialog;
 
-    public static void dismiss() {
+    public static synchronized void dismiss() {
         if (dialog != null && dialog.isShowing()) {
             dialog.dismiss();
         }
         dialog = null;
     }
 
-    public static void show(Context context, String title, String message, boolean indeterminate, boolean cancelable) {
+    public static synchronized void show(Context context, String title, String message, boolean indeterminate, boolean cancelable) {
         if (dialog == null) {
             dialog = ProgressDialog.show(context, title, message, indeterminate, cancelable);
         }
     }
 
-    public static void setMessage(final String message) {
+    public static synchronized void setMessage(final String message) {
         if (dialog != null && dialog.isShowing()) {
             dialog.setMessage(message);
         }
     }
 
-    public static boolean isShowing() {
+    public static synchronized boolean isShowing() {
         return dialog != null && dialog.isShowing();
     }