Update Android port

* doc/emacs/android.texi (Android Windowing): Document
`android-keyboard-bell-duration'.

* java/org/gnu/emacs/EmacsService.java (ringBell): New argument
DURATION.

* src/android.c (android_init_emacs_service): Adjust
correspondingly.
(android_bell): Provide the duration of the vibration.

* src/androidfns.c (syms_of_androidfns)
<android_keyboard_bell_duration>: New variable.

1 files changed, 5 insertions, 4 deletions

diff --git a/java/org/gnu/emacs/EmacsService.java b/java/org/gnu/emacs/EmacsService.java
index 05952f98cf1..997c6923fcc 100644
--- a/java/org/gnu/emacs/EmacsService.java
+++ b/java/org/gnu/emacs/EmacsService.java
@@ -448,12 +448,13 @@ public final class EmacsService extends Service
 
   @SuppressWarnings ("deprecation")
   public void
-  ringBell ()
+  ringBell (int duration)
   {
     Vibrator vibrator;
     VibrationEffect effect;
     VibratorManager vibratorManager;
     Object tem;
+    int amplitude;
 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
       {
@@ -467,13 +468,13 @@ public final class EmacsService extends Service
 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
       {
+        amplitude = VibrationEffect.DEFAULT_AMPLITUDE;
         effect
-          = VibrationEffect.createOneShot (50,
-                                           VibrationEffect.DEFAULT_AMPLITUDE);
+          = VibrationEffect.createOneShot (duration, amplitude);
         vibrator.vibrate (effect);
       }
     else
-      vibrator.vibrate (50);
+      vibrator.vibrate (duration);
   }
 
   public short[]