Implement notification callbacks on Android

* doc/lispref/os.texi (Desktop Notifications): Document that
:on-cancel, :on-action and :actions are now supported on
Android.

* java/org/gnu/emacs/EmacsActivity.java (onNewIntent): New
function.

* java/org/gnu/emacs/EmacsDesktopNotification.java
(NOTIFICATION_ACTION, NOTIFICATION_TAG, NOTIFICATION_DISMISSED):
New constants.  <actions, titles>: New fields.
(insertActions): New function.
(display1, display): Insert actions on Jelly Bean and up, and
arrange to be notified when the notification is dismissed.
(CancellationReceiver): New class.

* java/org/gnu/emacs/EmacsNative.java (sendNotificationDeleted)
(sendNotificationAction): New functions.

* src/android.c (sendDndDrag, sendDndUri, sendDndText): Correct
return types.
(sendNotificationDeleted, sendNotificationAction)
(android_exception_check_5, android_exception_check_6): New
functions.

* src/android.h:

* src/androidgui.h (struct android_notification_event): New
structure.
(union android_event): New member for notification events.

* src/androidselect.c (android_init_emacs_desktop_notification):
Update JNI signatures.
(android_notifications_notify_1, Fandroid_notifications_notify):
New arguments ACTIONS, ACTION_CB and CANCEL_CB.  Convert and
record them as appropriate.
(android_notification_deleted, android_notification_action): New
functions.
(syms_of_androidselect): Prepare a hash table of outstanding
notifications.
<QCactions, QCon_action, QCon_cancel> New defsyms.

* src/androidterm.c (handle_one_android_event)
<ANDROID_NOTIFICATION_DELETED>
<ANDROID_NOTIFICATION_ACTION>: Dispatch event contents to
androidselect.c for processing.

* src/androidterm.h:

* src/androidvfs.c (java_string_class): Export.

* src/keyboard.c (kbd_buffer_get_event) <NOTIFICATION_EVENT>:
Call callback specified by the event.

* src/termhooks.h (enum event_kind) [HAVE_ANDROID]: New
enum NOTIFICATION_EVENT.

1 files changed, 21 insertions, 1 deletions

diff --git a/src/androidterm.c b/src/androidterm.c
index baf26abe322..f68f8a9ef62 100644
--- a/src/androidterm.c
+++ b/src/androidterm.c
@@ -1761,6 +1761,26 @@ handle_one_android_event (struct android_display_info *dpyinfo,
       free (event->dnd.uri_or_string);
       goto OTHER;
 
+    case ANDROID_NOTIFICATION_DELETED:
+    case ANDROID_NOTIFICATION_ACTION:
+
+      if (event->notification.type == ANDROID_NOTIFICATION_DELETED)
+        android_notification_deleted (&event->notification, &inev.ie);
+      else
+        {
+          Lisp_Object action;
+
+          action = android_decode_utf16 (event->notification.action,
+                                         event->notification.length);
+          android_notification_action (&event->notification, &inev.ie,
+                                       action);
+        }
+
+      /* Free dynamically allocated data.  */
+      free (event->notification.tag);
+      free (event->notification.action);
+      goto OTHER;
+
     default:
       goto OTHER;
     }
@@ -4740,7 +4760,7 @@ android_sync_edit (void)
 
 /* Return a copy of the specified Java string and its length in
    *LENGTH.  Use the JNI environment ENV.  Value is NULL if copying
-   *the string fails.  */
+   the string fails.  */
 
 static unsigned short *
 android_copy_java_string (JNIEnv *env, jstring string, size_t *length)