Avert race condition between window attachment and buffer swap

* java/org/gnu/emacs/EmacsView.java (swapBuffers): Synchronize
such that code cannot execute between the bitmap's being loaded
and being transferred to surfaceView.
(onDetachedFromWindow): Recycle bitmap after the surface view is
reset.

* java/org/gnu/emacs/EmacsWindow.java (recreateActivity):

* src/android.c (android_init_emacs_window)
(android_recreate_activity):

* src/androidfns.c (Fandroid_recreate_activity)
(syms_of_androidfns): New functions for debugging window
attachment.

* src/androidgui.h: Update prototypes.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/androidfns.c b/src/androidfns.c
index 34f1f533684..eaecb78338b 100644
--- a/src/androidfns.c
+++ b/src/androidfns.c
@@ -3164,6 +3164,24 @@ android_set_preeditarea (struct window *w, int x, int y)
 				     y + w->phys_cursor_height);
 }
 
+
+
+/* Debugging.  */
+
+DEFUN ("android-recreate-activity", Fandroid_recreate_activity,
+       Sandroid_recreate_activity, 0, 0, "",
+       doc: /* Recreate the activity attached to the current frame.
+This function exists for debugging purposes and is of no interest to
+users.  */)
+  (void)
+{
+  struct frame *f;
+
+  f = decode_window_system_frame (Qnil);
+  android_recreate_activity (FRAME_ANDROID_WINDOW (f));
+  return Qnil;
+}
+
 #endif /* !ANDROID_STUBIFY */
 
 
@@ -3550,6 +3568,7 @@ language to be US English if LANGUAGE is empty.  */);
   defsubr (&Sandroid_request_directory_access);
   defsubr (&Sandroid_external_storage_available_p);
   defsubr (&Sandroid_request_storage_access);
+  defsubr (&Sandroid_recreate_activity);
 
   tip_timer = Qnil;
   staticpro (&tip_timer);