Quick settings tile for N preview (draft)

Addresses #671 but has NOT fixed it yet.

build.sbt

@@ -2,7 +2,7 @@ import android.Keys._
 
 android.Plugin.androidBuild
 
-platformTarget in Android := "android-23"
+platformTarget in Android := "android-N"
 
 name := "shadowsocks"
 

src/main/AndroidManifest.xml

@@ -48,6 +48,9 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
                 <category android:name="android.intent.category.LEANBACK_LAUNCHER"/>
             </intent-filter>
+            <intent-filter>
+                <action android:name="android.service.quicksettings.action.QS_TILE" />
+            </intent-filter>
         </activity>
 
         <activity
@@ -125,6 +128,14 @@
             </intent-filter>
         </service>
 
+        <service android:name=".ShadowsocksTileService" android:label="@string/app_name"
+                 android:icon="@drawable/ic_start_connected"
+                 android:permission="android.permission.BIND_QUICK_SETTINGS_TILE">
+            <intent-filter>
+                <action android:name="android.service.quicksettings.action.QS_TILE" />
+            </intent-filter>
+        </service>
+
         <receiver android:name=".ShadowsocksReceiver">
             <intent-filter>
                 <action android:name="android.intent.action.BOOT_COMPLETED"/>

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

@@ -0,0 +1,56 @@
+package com.github.shadowsocks
+
+import android.content.Intent
+import android.graphics.drawable.Icon
+import android.service.quicksettings.{Tile, TileService}
+import com.github.shadowsocks.aidl.IShadowsocksServiceCallback
+import com.github.shadowsocks.utils.State
+
+/**
+  * @author Mygod
+  */
+final class ShadowsocksTileService extends TileService with ServiceBoundContext {
+  private lazy val iconIdle = Icon.createWithResource(this, R.drawable.ic_start_idle).setTint(0x80ffffff)
+  private lazy val iconBusy = Icon.createWithResource(this, R.drawable.ic_start_busy)
+  private lazy val iconConnected = Icon.createWithResource(this, R.drawable.ic_start_connected)
+  private lazy val callback = new IShadowsocksServiceCallback.Stub {
+    def trafficUpdated(txRate: Long, rxRate: Long, txTotal: Long, rxTotal: Long) = ()
+    def stateChanged(state: Int, msg: String) {
+      val tile = getQsTile
+      state match {
+        case State.STOPPED =>
+          tile.setIcon(iconIdle)
+          tile.setLabel(getString(R.string.app_name))
+          tile.setState(Tile.STATE_INACTIVE)
+        case State.CONNECTED =>
+          tile.setIcon(iconConnected)
+          tile.setLabel(ShadowsocksApplication.currentProfile match {
+            case Some(profile) => profile.name
+            case None => getString(R.string.app_name)
+          })
+          tile.setState(Tile.STATE_ACTIVE)
+        case _ =>
+          tile.setIcon(iconBusy)
+          tile.setLabel(getString(R.string.app_name))
+          tile.setState(Tile.STATE_UNAVAILABLE)
+      }
+      tile.updateTile
+    }
+  }
+
+  override def onServiceConnected = callback.stateChanged(bgService.getState, null)
+
+  override def onStartListening {
+    super.onStartListening
+    attachService(callback)
+  }
+
+  override def onStopListening {
+    super.onStopListening
+    detachService // just in case the user switches to NAT mode
+  }
+
+  override def onClick = if (isLocked) unlockAndRun(configure) else configure()
+
+  private def configure() = startActivityAndCollapse(new Intent(this, classOf[Shadowsocks]))
+}