Fix signatures are being deprecated

This commit should fix the problem where VPN connection is viewed as metered connections on Android P DP1. However as I only have an emulator to test, I can't tell if it really works but it should.

An interesting observation is that the developer can call setUnderlyingNetworks(arrayOfNulls(1)) to make the VPN connection always unmetered. This is more of a quick hack instead of a real fix. Source: https://android.googlesource.com/platform/frameworks/base/+/adbf1d0/services/core/java/com/android/server/connectivity/Vpn.java#312

One may ask whether it's possible to fix this issue for Android 8.1. The short answer is not that I know of.
After some intensive source code reading, I found out that this is the commit that "breaks" whether VPN is metered for Android 8.1: https://android.googlesource.com/platform/frameworks/base/+/43d2a1700b6eb1d804924c6a1e5e0161a13a5348%5E%21/
The key is that isActiveNetworkMetered() used to return getActiveNetworkInfo().isMetered() and now it uses the more up-to-date API getActiveNetwork(). However, getActiveNetworkInfo() ignores VPN connections while getActiveNetwork() prefers VPN connection. And since NetworkCapabilities for VPN Network is always metered by default, this ultimately causes the bug. One might be able to get around this bug by somehow calling NetworkAgent.sendNetworkCapabilities in the correct context.

Fix #1666.

build.gradle

@@ -6,9 +6,10 @@ buildscript {
     ext {
         kotlinVersion = '1.2.30'
         minSdkVersion = 21
-        sdkVersion = 27
-        buildToolsVersion = '27.0.3'
-        supportLibraryVersion = '27.1.0'
+        sdkVersion = 'P'
+        compileSdkVersion = 'android-P'
+        buildToolsVersion = '28-rc1'
+        supportLibraryVersion = '28.0.0-alpha1'
         takisoftFixVersion = '27.1.0.0'
         playServicesVersion = '11.8.0'
         junitVersion = '4.12'
@@ -22,7 +23,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.2.0-alpha05'
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.17.0'
         classpath 'com.google.gms:google-services:3.2.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"

core/build.gradle

@@ -4,7 +4,7 @@ apply plugin: 'com.android.library'
 
 android {
     buildToolsVersion rootProject.buildToolsVersion
-    compileSdkVersion rootProject.sdkVersion
+    compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {
         minSdkVersion rootProject.minSdkVersion

gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip

mobile/build.gradle

@@ -16,7 +16,7 @@ def getCurrentFlavor() {
 
 android {
     buildToolsVersion rootProject.buildToolsVersion
-    compileSdkVersion rootProject.sdkVersion
+    compileSdkVersion rootProject.compileSdkVersion
     defaultConfig {
         applicationId "com.github.shadowsocks"
         minSdkVersion rootProject.minSdkVersion

mobile/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
           package="com.github.shadowsocks"
           android:installLocation="internalOnly">
 
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
     <uses-permission android:name="android.permission.NFC" />

mobile/src/main/java/android/support/design/animation/AnimationConsts.kt

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ *                                                                             *
+ *  Copyright (C) 2017 by Max Lv <max.c.lv@gmail.com>                          *
+ *  Copyright (C) 2017 by Mygod Studio <contact-shadowsocks-android@mygod.be>  *
+ *                                                                             *
+ *  This program is free software: you can redistribute it and/or modify       *
+ *  it under the terms of the GNU General Public License as published by       *
+ *  the Free Software Foundation, either version 3 of the License, or          *
+ *  (at your option) any later version.                                        *
+ *                                                                             *
+ *  This program is distributed in the hope that it will be useful,            *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
+ *  GNU General Public License for more details.                               *
+ *                                                                             *
+ *  You should have received a copy of the GNU General Public License          *
+ *  along with this program. If not, see <http://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+package android.support.design.animation
+
+import android.animation.TimeInterpolator
+
+object AnimationConsts {
+    val FAST_OUT_SLOW_IN_INTERPOLATOR: TimeInterpolator get() = AnimationUtils.FAST_OUT_SLOW_IN_INTERPOLATOR
+}

mobile/src/main/java/android/support/design/widget/SnackbarAnimation.kt

@@ -1,8 +0,0 @@
-package android.support.design.widget
-
-import android.view.animation.Interpolator
-
-object SnackbarAnimation {
-    val FAST_OUT_SLOW_IN_INTERPOLATOR: Interpolator get() = AnimationUtils.FAST_OUT_SLOW_IN_INTERPOLATOR
-    const val ANIMATION_DURATION = BaseTransientBottomBar.ANIMATION_DURATION.toLong()
-}

mobile/src/main/java/android/support/design/widget/SnackbarConsts.kt

@@ -0,0 +1,25 @@
+/*******************************************************************************
+ *                                                                             *
+ *  Copyright (C) 2017 by Max Lv <max.c.lv@gmail.com>                          *
+ *  Copyright (C) 2017 by Mygod Studio <contact-shadowsocks-android@mygod.be>  *
+ *                                                                             *
+ *  This program is free software: you can redistribute it and/or modify       *
+ *  it under the terms of the GNU General Public License as published by       *
+ *  the Free Software Foundation, either version 3 of the License, or          *
+ *  (at your option) any later version.                                        *
+ *                                                                             *
+ *  This program is distributed in the hope that it will be useful,            *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
+ *  GNU General Public License for more details.                               *
+ *                                                                             *
+ *  You should have received a copy of the GNU General Public License          *
+ *  along with this program. If not, see <http://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+package android.support.design.widget
+
+object SnackbarConsts {
+    const val ANIMATION_DURATION = BaseTransientBottomBar.ANIMATION_DURATION.toLong()
+}

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

@@ -34,6 +34,7 @@ import android.os.Build
 import android.os.Handler
 import android.os.Looper
 import android.support.annotation.RequiresApi
+import android.support.v4.os.BuildCompat
 import android.support.v4.os.UserManagerCompat
 import android.support.v7.app.AppCompatDelegate
 import android.util.Log
@@ -73,8 +74,8 @@ class App : Application() {
     private val tracker: Tracker by lazy { GoogleAnalytics.getInstance(deviceContext).newTracker(R.xml.tracker) }
     val info: PackageInfo by lazy { getPackageInfo(packageName) }
 
-    fun getPackageInfo(packageName: String) =
-            packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES)!!
+    fun getPackageInfo(packageName: String) = packageManager.getPackageInfo(packageName, if (BuildCompat.isAtLeastP())
+        PackageManager.GET_SIGNING_CERTIFICATES else @Suppress("DEPRECATION") PackageManager.GET_SIGNATURES)!!
 
     fun startService() {
         val intent = Intent(this, BaseService.serviceClass.java)

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

@@ -27,7 +27,6 @@ import android.annotation.SuppressLint
 import android.content.BroadcastReceiver
 import android.content.ClipData
 import android.content.ClipboardManager
-import android.content.Context
 import android.content.pm.ApplicationInfo
 import android.content.pm.PackageInfo
 import android.content.pm.PackageManager
@@ -49,10 +48,7 @@ import com.futuremind.recyclerviewfastscroll.SectionTitleProvider
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.database.ProfileManager
 import com.github.shadowsocks.preference.DataStore
-import com.github.shadowsocks.utils.DirectBoot
-import com.github.shadowsocks.utils.Key
-import com.github.shadowsocks.utils.resolveResourceId
-import com.github.shadowsocks.utils.thread
+import com.github.shadowsocks.utils.*
 import java.util.concurrent.atomic.AtomicBoolean
 
 class AppManager : AppCompatActivity(), Toolbar.OnMenuItemClickListener {
@@ -142,7 +138,7 @@ class AppManager : AppCompatActivity(), Toolbar.OnMenuItemClickListener {
     private lateinit var loadingView: View
     private val appsLoading = AtomicBoolean()
     private val handler = Handler()
-    private val clipboard by lazy { getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager }
+    private val clipboard by lazy { systemService<ClipboardManager>() }
 
     private fun initProxiedApps(str: String = DataStore.individual) {
         proxiedApps = str.split('\n').toHashSet()

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

@@ -45,6 +45,7 @@ import com.github.shadowsocks.database.ProfileManager
 import com.github.shadowsocks.plugin.PluginConfiguration
 import com.github.shadowsocks.preference.DataStore
 import com.github.shadowsocks.utils.Action
+import com.github.shadowsocks.utils.systemService
 import com.github.shadowsocks.widget.UndoSnackbarManager
 import com.google.android.gms.ads.AdRequest
 import com.google.android.gms.ads.AdSize
@@ -305,7 +306,7 @@ class ProfilesFragment : ToolbarFragment(), Toolbar.OnMenuItemClickListener {
     private var txTotal: Long = 0L
     private var rxTotal: Long = 0L
 
-    private val clipboard by lazy { requireContext().getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager }
+    private val clipboard by lazy { requireContext().systemService<ClipboardManager>() }
 
     private fun startConfig(id: Int) = startActivity(Intent(context, ProfileConfigActivity::class.java)
             .putExtra(Action.EXTRA_PROFILE_ID, id))

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

@@ -21,7 +21,6 @@
 package com.github.shadowsocks
 
 import android.app.Activity
-import android.content.Context
 import android.content.Intent
 import android.content.pm.ShortcutManager
 import android.graphics.BitmapFactory
@@ -40,6 +39,7 @@ import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.database.Profile
 import com.github.shadowsocks.database.ProfileManager
 import com.github.shadowsocks.utils.resolveResourceId
+import com.github.shadowsocks.utils.systemService
 import com.google.android.gms.samples.vision.barcodereader.BarcodeCapture
 import com.google.android.gms.samples.vision.barcodereader.BarcodeGraphic
 import com.google.android.gms.vision.Frame
@@ -65,7 +65,7 @@ class ScannerActivity : AppCompatActivity(), Toolbar.OnMenuItemClickListener, Ba
         super.onCreate(savedInstanceState)
         if (Build.VERSION.SDK_INT >= 25) getSystemService(ShortcutManager::class.java).reportShortcutUsed("scan")
         if (try {
-                    (getSystemService(Context.CAMERA_SERVICE) as CameraManager).cameraIdList.isEmpty()
+                    systemService<CameraManager>().cameraIdList.isEmpty()
                 } catch (_: CameraAccessException) {
                     true
                 }) {

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

@@ -22,7 +22,6 @@ package com.github.shadowsocks
 
 import android.app.KeyguardManager
 import android.content.BroadcastReceiver
-import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.net.VpnService
@@ -33,6 +32,7 @@ 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
+import com.github.shadowsocks.utils.systemService
 
 class VpnRequestActivity : AppCompatActivity(), ShadowsocksConnection.Interface {
     companion object {
@@ -48,8 +48,7 @@ class VpnRequestActivity : AppCompatActivity(), ShadowsocksConnection.Interface
             finish()
             return
         }
-        val km = getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager
-        if (km.inKeyguardRestrictedInputMode()) {
+        if (systemService<KeyguardManager>().inKeyguardRestrictedInputMode()) {
             receiver = broadcastReceiver { _, _ -> connection.connect() }
             registerReceiver(receiver, IntentFilter(Intent.ACTION_USER_PRESENT))
         } else connection.connect()

mobile/src/main/java/com/github/shadowsocks/acl/CustomRulesFragment.kt

@@ -22,7 +22,6 @@ package com.github.shadowsocks.acl
 
 import android.content.ClipData
 import android.content.ClipboardManager
-import android.content.Context
 import android.os.Build
 import android.os.Bundle
 import android.support.design.widget.Snackbar
@@ -48,6 +47,7 @@ import com.github.shadowsocks.bg.BaseService
 import com.github.shadowsocks.utils.Subnet
 import com.github.shadowsocks.utils.asIterable
 import com.github.shadowsocks.utils.resolveResourceId
+import com.github.shadowsocks.utils.systemService
 import com.github.shadowsocks.widget.UndoSnackbarManager
 import java.net.IDN
 import java.net.MalformedURLException
@@ -360,7 +360,7 @@ class CustomRulesFragment : ToolbarFragment(), Toolbar.OnMenuItemClickListener,
     private lateinit var list: RecyclerView
     private var mode: ActionMode? = null
     private lateinit var undoManager: UndoSnackbarManager<Any>
-    private val clipboard by lazy { requireContext().getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager }
+    private val clipboard by lazy { requireContext().systemService<ClipboardManager>() }
 
     private fun onSelectedItemsUpdated() {
         if (selectedItems.isEmpty()) mode?.finish() else if (mode == null) mode = toolbar.startActionMode(this)

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

@@ -354,7 +354,7 @@ object BaseService {
                                 .readTimeout(30, TimeUnit.SECONDS)
                                 .build()
                         val mdg = MessageDigest.getInstance("SHA-1")
-                        mdg.update(app.info.signatures[0].toByteArray())
+                        mdg.update(app.info.signaturesCompat.first().toByteArray())
                         val requestBody = FormBody.Builder()
                                 .add("sig", String(Base64.encode(mdg.digest(), 0)))
                                 .build()

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

@@ -36,6 +36,7 @@ import com.github.shadowsocks.R
 import com.github.shadowsocks.aidl.IShadowsocksServiceCallback
 import com.github.shadowsocks.utils.Action
 import com.github.shadowsocks.utils.broadcastReceiver
+import com.github.shadowsocks.utils.systemService
 import java.util.*
 
 /**
@@ -46,7 +47,7 @@ import java.util.*
  */
 class ServiceNotification(private val service: BaseService.Interface, profileName: String,
                           channel: String, private val visible: Boolean = false) {
-    private val keyGuard = (service as Context).getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager
+    private val keyGuard = (service as Context).systemService<KeyguardManager>()
     private val nm by lazy {
         (service as Context).getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
     }
@@ -82,7 +83,7 @@ class ServiceNotification(private val service: BaseService.Interface, profileNam
         service as Context
         if (Build.VERSION.SDK_INT < 24) builder.addAction(R.drawable.ic_navigation_close,
                 service.getString(R.string.stop), PendingIntent.getBroadcast(service, 0, Intent(Action.CLOSE), 0))
-        val power = service.getSystemService(Context.POWER_SERVICE) as PowerManager
+        val power = service.systemService<PowerManager>()
         update(if (power.isInteractive) Intent.ACTION_SCREEN_ON else Intent.ACTION_SCREEN_OFF, true)
         val screenFilter = IntentFilter()
         screenFilter.addAction(Intent.ACTION_SCREEN_ON)

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

@@ -21,7 +21,6 @@
 package com.github.shadowsocks.bg
 
 import android.app.KeyguardManager
-import android.content.Context
 import android.graphics.drawable.Icon
 import android.service.quicksettings.Tile
 import android.support.annotation.RequiresApi
@@ -31,6 +30,7 @@ import com.github.shadowsocks.ShadowsocksConnection
 import com.github.shadowsocks.aidl.IShadowsocksService
 import com.github.shadowsocks.aidl.IShadowsocksServiceCallback
 import com.github.shadowsocks.preference.DataStore
+import com.github.shadowsocks.utils.systemService
 import android.service.quicksettings.TileService as BaseTileService
 
 @RequiresApi(24)
@@ -38,7 +38,7 @@ class TileService : BaseTileService(), ShadowsocksConnection.Interface {
     private val iconIdle by lazy { Icon.createWithResource(this, R.drawable.ic_service_idle) }
     private val iconBusy by lazy { Icon.createWithResource(this, R.drawable.ic_service_busy) }
     private val iconConnected by lazy { Icon.createWithResource(this, R.drawable.ic_service_active) }
-    private val keyguard by lazy { getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager }
+    private val keyguard by lazy { systemService<KeyguardManager>() }
 
     override val serviceCallback: IShadowsocksServiceCallback.Stub by lazy {
         @RequiresApi(24)

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

@@ -20,12 +20,15 @@
 
 package com.github.shadowsocks.bg
 
+import android.annotation.TargetApi
 import android.app.Service
 import android.content.Intent
 import android.content.pm.PackageManager
-import android.net.LocalSocket
+import android.net.*
+import android.os.Build
 import android.os.IBinder
 import android.os.ParcelFileDescriptor
+import android.support.v4.os.BuildCompat
 import android.util.Log
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.JniHelper
@@ -36,6 +39,7 @@ import com.github.shadowsocks.acl.Acl
 import com.github.shadowsocks.preference.DataStore
 import com.github.shadowsocks.utils.Subnet
 import com.github.shadowsocks.utils.parseNumericAddress
+import com.github.shadowsocks.utils.systemService
 import java.io.File
 import java.io.FileDescriptor
 import java.io.IOException
@@ -50,6 +54,20 @@ class VpnService : BaseVpnService(), LocalDnsService.Interface {
         private const val PRIVATE_VLAN6 = "fdfe:dcba:9876::%s"
 
         private val getInt: Method = FileDescriptor::class.java.getDeclaredMethod("getInt$")
+
+        /**
+         * Unfortunately registerDefaultNetworkCallback is going to return our VPN interface: https://android.googlesource.com/platform/frameworks/base/+/dda156ab0c5d66ad82bdcf76cda07cbc0a9c8a2e
+         *
+         * This makes doing a requestNetwork with REQUEST necessary so that we don't get ALL possible networks that
+         * satisfies default network capabilities but only THE default network. Unfortunately we need to have
+         * android.permission.CHANGE_NETWORK_STATE to be able to call requestNetwork.
+         *
+         * Source: https://android.googlesource.com/platform/frameworks/base/+/2df4c7d/services/core/java/com/android/server/ConnectivityService.java#887
+         */
+        private val defaultNetworkRequest = NetworkRequest.Builder()
+                .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+                .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
+                .build()
     }
 
     private inner class ProtectWorker : LocalSocketListener("ShadowsocksVpnThread") {
@@ -90,6 +108,22 @@ class VpnService : BaseVpnService(), LocalDnsService.Interface {
     private var worker: ProtectWorker? = null
     private var tun2socksProcess: GuardedProcess? = null
 
+    private val connectivity by lazy { systemService<ConnectivityManager>() }
+    @TargetApi(Build.VERSION_CODES.P)
+    private val defaultNetworkCallback = object : ConnectivityManager.NetworkCallback() {
+        override fun onAvailable(network: Network) {
+            setUnderlyingNetworks(arrayOf(network))
+        }
+        override fun onCapabilitiesChanged(network: Network, networkCapabilities: NetworkCapabilities?) {
+            // it's a good idea to refresh capabilities
+            setUnderlyingNetworks(arrayOf(network))
+        }
+        override fun onLost(network: Network) {
+            setUnderlyingNetworks(null)
+        }
+    }
+    private var listeningForDefaultNetwork = false
+
     override fun onBind(intent: Intent): IBinder? = when (intent.action) {
         SERVICE_INTERFACE -> super<BaseVpnService>.onBind(intent)
         else -> super<LocalDnsService.Interface>.onBind(intent)
@@ -98,6 +132,10 @@ class VpnService : BaseVpnService(), LocalDnsService.Interface {
     override fun onRevoke() = stopRunner(true)
 
     override fun killProcesses() {
+        if (BuildCompat.isAtLeastP() && listeningForDefaultNetwork) {
+            connectivity.unregisterNetworkCallback(defaultNetworkCallback)
+            listeningForDefaultNetwork = false
+        }
         worker?.stopThread()
         worker = null
         super.killProcesses()
@@ -179,6 +217,13 @@ class VpnService : BaseVpnService(), LocalDnsService.Interface {
         this.conn = conn
         val fd = conn.fd
 
+        // We only need to update since Android P: https://android.googlesource.com/platform/frameworks/base/+/72f9c42b9e59761a28d6b32c42f65de57c98daed
+        if (BuildCompat.isAtLeastP()) {
+            // we want REQUEST here instead of LISTEN
+            connectivity.requestNetwork(defaultNetworkRequest, defaultNetworkCallback)
+            listeningForDefaultNetwork = true
+        }
+
         val cmd = arrayListOf(File(applicationInfo.nativeLibraryDir, Executable.TUN2SOCKS).absolutePath,
                 "--netif-ipaddr", PRIVATE_VLAN.format(Locale.ENGLISH, "2"),
                 "--netif-netmask", "255.255.255.0",

mobile/src/main/java/com/github/shadowsocks/plugin/PluginManager.kt

@@ -32,6 +32,7 @@ import android.util.Base64
 import android.util.Log
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.utils.Commandline
+import com.github.shadowsocks.utils.signaturesCompat
 import eu.chainfire.libsuperuser.Shell
 import java.io.File
 import java.io.FileNotFoundException
@@ -47,7 +48,7 @@ object PluginManager {
      * public key yet since it will also automatically trust packages signed by the same signatures, e.g. debug keys.
      */
     val trustedSignatures by lazy {
-        app.info.signatures.toSet() +
+        app.info.signaturesCompat.toSet() +
                 Signature(Base64.decode(  // @Mygod
                 """
                     |MIIDWzCCAkOgAwIBAgIEUzfv8DANBgkqhkiG9w0BAQsFADBdMQswCQYDVQQGEwJD

mobile/src/main/java/com/github/shadowsocks/plugin/ResolvedPlugin.kt

@@ -24,6 +24,7 @@ import android.content.pm.ResolveInfo
 import android.graphics.drawable.Drawable
 import android.os.Bundle
 import com.github.shadowsocks.App.Companion.app
+import com.github.shadowsocks.utils.signaturesCompat
 
 abstract class ResolvedPlugin(protected val resolveInfo: ResolveInfo) : Plugin() {
     protected abstract val metaData: Bundle
@@ -34,6 +35,6 @@ abstract class ResolvedPlugin(protected val resolveInfo: ResolveInfo) : Plugin()
     override val defaultConfig: String by lazy { metaData.getString(PluginContract.METADATA_KEY_DEFAULT_CONFIG) }
     override val packageName: String get() = resolveInfo.resolvePackageName
     override val trusted by lazy {
-        app.getPackageInfo(packageName).signatures.any(PluginManager.trustedSignatures::contains)
+        app.getPackageInfo(packageName).signaturesCompat.any(PluginManager.trustedSignatures::contains)
     }
 }

mobile/src/main/java/com/github/shadowsocks/utils/Utils.kt

@@ -3,11 +3,14 @@ package com.github.shadowsocks.utils
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageInfo
 import android.content.res.Resources
 import android.os.Build
 import android.support.annotation.AttrRes
 import android.support.v4.app.Fragment
 import android.support.v4.app.FragmentManager
+import android.support.v4.content.ContextCompat
+import android.support.v4.os.BuildCompat
 import android.support.v7.util.SortedList
 import android.util.TypedValue
 import com.github.shadowsocks.App.Companion.app
@@ -50,6 +53,12 @@ fun thread(start: Boolean = true, isDaemon: Boolean = false, contextClassLoader:
 val URLConnection.responseLength: Long
     get() = if (Build.VERSION.SDK_INT >= 24) contentLengthLong else contentLength.toLong()
 
+inline fun <reified T> Context.systemService() = ContextCompat.getSystemService(this, T::class.java)!!
+
+val PackageInfo.signaturesCompat get() =
+    if (BuildCompat.isAtLeastP()) signingCertificateHistory.flatten()
+    else @Suppress("DEPRECATION") signatures.asIterable()
+
 /**
  * Based on: https://stackoverflow.com/a/15656428/2245107
  */

mobile/src/main/java/com/github/shadowsocks/widget/ShrinkUpwardBehavior.kt

@@ -22,18 +22,20 @@ package com.github.shadowsocks.widget
 
 import android.animation.ValueAnimator
 import android.content.Context
+import android.support.design.animation.AnimationConsts
 import android.support.design.widget.CoordinatorLayout
 import android.support.design.widget.Snackbar
-import android.support.design.widget.SnackbarAnimation
+import android.support.design.widget.SnackbarConsts
 import android.util.AttributeSet
 import android.view.View
 import android.view.accessibility.AccessibilityManager
+import com.github.shadowsocks.utils.systemService
 
 /**
  * Full credits go to: https://stackoverflow.com/a/35904421/2245107
  */
 class ShrinkUpwardBehavior(context: Context, attrs: AttributeSet) : CoordinatorLayout.Behavior<View>(context, attrs) {
-    private val accessibility = context.getSystemService(Context.ACCESSIBILITY_SERVICE) as AccessibilityManager
+    private val accessibility = context.systemService<AccessibilityManager>()
 
     override fun layoutDependsOn(parent: CoordinatorLayout, child: View, dependency: View): Boolean =
             dependency is Snackbar.SnackbarLayout
@@ -52,8 +54,8 @@ class ShrinkUpwardBehavior(context: Context, attrs: AttributeSet) : CoordinatorL
             val animator = ValueAnimator()
             val start = child.height
             animator.setIntValues(start, parent.height)
-            animator.interpolator = SnackbarAnimation.FAST_OUT_SLOW_IN_INTERPOLATOR
-            animator.duration = SnackbarAnimation.ANIMATION_DURATION
+            animator.interpolator = AnimationConsts.FAST_OUT_SLOW_IN_INTERPOLATOR
+            animator.duration = SnackbarConsts.ANIMATION_DURATION
             @Suppress("NAME_SHADOWING")
             animator.addUpdateListener { animator ->
                 child.layoutParams.height = animator.animatedValue as Int

plugin/build.gradle

@@ -5,7 +5,7 @@ apply from: 'gradle-mvn-push.gradle'
 
 android {
     buildToolsVersion rootProject.buildToolsVersion
-    compileSdkVersion rootProject.sdkVersion
+    compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {
         minSdkVersion rootProject.minSdkVersion