Fix DeathRecipient leaking bug

src/main/scala/com/github/shadowsocks/ServiceBoundContext.scala

@@ -9,10 +9,11 @@ import com.github.shadowsocks.ShadowsocksApplication.app
 /**
   * @author Mygod
   */
-trait ServiceBoundContext extends Context {
+trait ServiceBoundContext extends Context with IBinder.DeathRecipient {
   class ShadowsocksServiceConnection extends ServiceConnection {
     override def onServiceConnected(name: ComponentName, service: IBinder) {
-      service.linkToDeath(new ShadowsocksDeathRecipient(ServiceBoundContext.this), 0)
+      binder = service
+      service.linkToDeath(ServiceBoundContext.this, 0)
       bgService = IShadowsocksService.Stub.asInterface(service)
       registerCallback
       ServiceBoundContext.this.onServiceConnected()
@@ -21,6 +22,7 @@ trait ServiceBoundContext extends Context {
       unregisterCallback
       ServiceBoundContext.this.onServiceDisconnected()
       bgService = null
+      binder = null
     }
   }
 
@@ -40,12 +42,14 @@ trait ServiceBoundContext extends Context {
 
   def onServiceConnected() = ()
   def onServiceDisconnected() = ()
+  override def binderDied = ()
 
   private var callback: IShadowsocksServiceCallback.Stub = _
   private var connection: ShadowsocksServiceConnection = _
   private var callbackRegistered: Boolean = _
 
   // Variables
+  var binder: IBinder = _
   var bgService: IShadowsocksService = _
 
   def attachService(callback: IShadowsocksServiceCallback.Stub = null) {
@@ -70,6 +74,10 @@ trait ServiceBoundContext extends Context {
       unbindService(connection)
       connection = null
     }
+    if (binder != null) {
+      binder.unlinkToDeath(this, 0)
+      binder = null
+    }
     bgService = null
   }
 }

src/main/scala/com/github/shadowsocks/Shadowsocks.scala

@@ -214,6 +214,12 @@ class Shadowsocks extends AppCompatActivity with ServiceBoundContext {
     if (fab != null) fab.setEnabled(false)
   }
 
+  override def binderDied {
+    detachService
+    crashRecovery
+    attachService
+  }
+
   private var testCount: Int = _
   private lazy val stat = findViewById(R.id.stat)
   private var connectionTestText: TextView = _

src/main/scala/com/github/shadowsocks/ShadowsocksDeathRecipient.scala

@@ -1,24 +0,0 @@
-package com.github.shadowsocks
-
-import android.os.IBinder
-import android.util.Log
-
-/**
-  * @author chentaov5@gmail.com
-  */
-class ShadowsocksDeathRecipient(val mContext: ServiceBoundContext)
-  extends IBinder.DeathRecipient {
-
-  val TAG = "ShadowsocksDeathRecipient"
-
-  override def binderDied(): Unit = {
-    Log.d(TAG, "[ShadowsocksDeathRecipient] binder died.")
-    mContext match {
-      case ss: Shadowsocks =>
-        ss.detachService
-        ss.crashRecovery
-        ss.attachService
-      case _ =>
-    }
-  }
-}