tdf#119082 Exception wrong thread on Android Viewer

Change-Id: I58a8d104b24c7cf2d021e2dce700e25592c8a605
Signed-off-by: Mert Tumer <merttumer@outlook.com>
Reviewed-on: https://gerrit.libreoffice.org/58563
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

android/source/src/java/org/libreoffice/LOKitThread.java

@@ -230,7 +230,12 @@ class LOKitThread extends Thread {
         if (mTileProvider.isReady()) {
             LOKitShell.showProgressSpinner(mContext);
             updateZoomConstraints();
-            refresh();
+            LOKitShell.getMainHandler().post(new Runnable() {
+                @Override
+                public void run() {
+                    refresh();
+                }
+            });
             LOKitShell.hideProgressSpinner(mContext);
         } else {
             closeDocument();