Implement submenus on Android

* java/org/gnu/emacs/EmacsActivity.java (onCreate): Set the
default theme to Theme.DeviceDefault.NoActionBar if possible.
(onContextMenuClosed): Add hack for Android bug.
* java/org/gnu/emacs/EmacsContextMenu.java (EmacsContextMenu)
(onMenuItemClick): Set flag upon submenu selection.
(inflateMenuItems): Set onClickListener for submenus as well.
(display1): Clear new flag.
* java/org/gnu/emacs/EmacsDrawRectangle.java (perform): Fix
rectangle bounds.
* java/org/gnu/emacs/EmacsNative.java (EmacsNative):
* java/org/gnu/emacs/EmacsService.java (onCreate): Pass cache
directory.
(sync): New function.
* src/android.c (struct android_emacs_service): New method
`sync'.
(setEmacsParams, initEmacs): Handle cache directory.
(android_init_emacs_service): Initialize new method `sync'.
(android_sync): New function.
* src/androidfns.c (Fx_show_tip): Call both functions.
* src/androidgui.h: Update prototypes.
* src/androidmenu.c (struct android_menu_subprefix)
(android_free_subprefixes, android_menu_show): Handle submenu
prefixes correctly.
* src/androidterm.c (handle_one_android_event): Clear help echo
on MotionNotify like on X.
* src/menu.c (single_menu_item): Enable submenus on Android.

java/org/gnu/emacs/EmacsNative.java

@@ -38,6 +38,9 @@ public class EmacsNative
      libDir must be the package's data storage location for native
      libraries.  It is used as PATH.
 
+     cacheDir must be the package's cache directory.  It is used as
+     the `temporary-file-directory'.
+
      pixelDensityX and pixelDensityY are the DPI values that will be
      used by Emacs.
 
@@ -45,6 +48,7 @@ public class EmacsNative
   public static native void setEmacsParams (AssetManager assetManager,
 					    String filesDir,
 					    String libDir,
+					    String cacheDir,
 					    float pixelDensityX,
 					    float pixelDensityY,
 					    EmacsService emacsService);