Fix translucent style

mobile/src/main/java/com/github/shadowsocks/VpnRequestActivity.kt

@@ -20,7 +20,6 @@
 
 package com.github.shadowsocks
 
-import android.app.Activity
 import android.app.KeyguardManager
 import android.content.BroadcastReceiver
 import android.content.Context
@@ -28,13 +27,14 @@ import android.content.Intent
 import android.content.IntentFilter
 import android.net.VpnService
 import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
 import android.util.Log
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.aidl.IShadowsocksService
 import com.github.shadowsocks.bg.BaseService
 import com.github.shadowsocks.utils.broadcastReceiver
 
-class VpnRequestActivity : Activity(), ShadowsocksConnection.Interface {
+class VpnRequestActivity : AppCompatActivity(), ShadowsocksConnection.Interface {
     companion object {
         private const val TAG = "VpnRequestActivity"
         private const val REQUEST_CONNECT = 1

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

@@ -41,7 +41,7 @@ abstract class LocalSocketListener(protected val tag: String) : Thread() {
      * Inherited class do not need to close input/output streams as they will be closed automatically.
      */
     protected abstract fun accept(socket: LocalSocket)
-    override final fun run() {
+    final override fun run() {
         socketFile.delete() // It's a must-have to close and reuse previous local socket.
         LocalSocket().use { localSocket ->
             val serverSocket = try {