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, 1 insertions, 0 deletions

diff --git a/src/androidgui.h b/src/androidgui.h
index 69efd393d55..89317581191 100644
--- a/src/androidgui.h
+++ b/src/androidgui.h
@@ -708,6 +708,7 @@ extern void android_translate_coordinates (android_window, int,
 extern int android_wc_lookup_string (android_key_pressed_event *,
                                      wchar_t *, int, int *,
                                      enum android_lookup_status *);
+extern void android_recreate_activity (android_window);
 extern void android_update_ic (android_window, ptrdiff_t, ptrdiff_t,
                                ptrdiff_t, ptrdiff_t);
 extern void android_reset_ic (android_window, enum android_ic_mode);