jni: Add previous() and next()

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

vlc-android/jni/libvlcjni.c

@@ -830,6 +830,20 @@ void Java_org_videolan_vlc_LibVLC_stop(JNIEnv *env, jobject thiz)
         libvlc_media_list_player_stop(mp);
 }
 
+void Java_org_videolan_vlc_LibVLC_previous(JNIEnv *env, jobject thiz)
+{
+    libvlc_media_list_player_t *mp = getMediaListPlayer(env, thiz);
+    if (mp)
+        libvlc_media_list_player_previous(mp);
+}
+
+void Java_org_videolan_vlc_LibVLC_next(JNIEnv *env, jobject thiz)
+{
+    libvlc_media_list_player_t *mp = getMediaListPlayer(env, thiz);
+    if (mp)
+        libvlc_media_list_player_next(mp);
+}
+
 jint Java_org_videolan_vlc_LibVLC_getVolume(JNIEnv *env, jobject thiz)
 {
     libvlc_media_player_t *mp = getMediaPlayer(env, thiz);

vlc-android/src/org/videolan/vlc/LibVLC.java

@@ -348,6 +348,16 @@ public class LibVLC {
      */
     public native void stop();
 
+    /**
+     * Play the previous media (if any) in the media list
+     */
+    public native void previous();
+
+    /**
+     * Play the next media (if any) in the media list
+     */
+    public native void next();
+
     /**
      * Gets volume as integer
      */