Misc refinements

* Refine Kotlin codes;
* Support RTL;
* Use VectorDrawable for notification;
* Remove redundant resources;
* Better IDE integration.

mobile/src/main/java/com/github/shadowsocks/bg/Executable.kt

@@ -28,13 +28,12 @@ import java.io.File
 
 object Executable {
     const val REDSOCKS = "libredsocks.so"
-    const val PDNSD = "libpdnsd.so"
     const val SS_LOCAL = "libss-local.so"
     const val SS_TUNNEL = "libss-tunnel.so"
     const val TUN2SOCKS = "libtun2socks.so"
     const val OVERTURE = "liboverture.so"
 
-    val EXECUTABLES = setOf(SS_LOCAL, SS_TUNNEL, PDNSD, REDSOCKS, TUN2SOCKS, OVERTURE)
+    val EXECUTABLES = setOf(SS_LOCAL, SS_TUNNEL, REDSOCKS, TUN2SOCKS, OVERTURE)
 
     fun killAll() {
         for (process in File("/proc").listFiles { _, name -> TextUtils.isDigitsOnly(name) }) {

mobile/src/main/java/com/github/shadowsocks/bg/ServiceNotification.kt

@@ -69,7 +69,7 @@ class ServiceNotification(private val service: BaseService.Interface, profileNam
             .setContentTitle(profileName)
             .setContentIntent(PendingIntent.getActivity(service, 0, Intent(service, MainActivity::class.java)
                     .setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT), 0))
-            .setSmallIcon(R.drawable.ic_stat_shadowsocks)
+            .setSmallIcon(R.drawable.ic_start_connected)
     private val style = NotificationCompat.BigTextStyle(builder)
     private var isVisible = true
 

mobile/src/main/java/com/github/shadowsocks/bg/TrafficMonitor.kt

@@ -35,11 +35,11 @@ object TrafficMonitor {
     var rxTotal = 0L
 
     // Bytes for the last query
-    var txLast = 0L
-    var rxLast = 0L
-    var timestampLast = 0L
+    private var txLast = 0L
+    private var rxLast = 0L
+    private var timestampLast = 0L
     @Volatile
-    var dirty = true
+    private var dirty = true
 
     private val units = arrayOf("KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", "BB", "NB", "DB", "CB")
     private val numberFormat = DecimalFormat("@@@")