updated to android studio 3 beta 4, fixed a crash, fixed some warnings, suppressed some warnings.

src/musikdroid/app/build.gradle

@@ -88,9 +88,9 @@ dependencies {
     implementation 'com.github.pluscubed:recycler-fast-scroll:0.3.2@aar'
     implementation 'com.facebook.stetho:stetho:1.5.0'
 
-    implementation 'com.android.support:appcompat-v7:26.0.1'
+    implementation 'com.android.support:appcompat-v7:26.0.2'
-    implementation 'com.android.support:recyclerview-v7:26.0.1'
+    implementation 'com.android.support:recyclerview-v7:26.0.2'
-    implementation 'com.android.support:design:26.0.1'
+    implementation 'com.android.support:design:26.0.2'
 
     implementation('com.crashlytics.sdk.android:crashlytics:2.6.8@aar') {
         transitive = true

src/musikdroid/app/src/main/java/io/casey/musikcube/remote/ui/activity/ConnectionsActivity.kt

@@ -60,19 +60,20 @@ class ConnectionsActivity : WebSocketActivityBase() {
     override val playbackServiceEventListener: (() -> Unit)?
         get() = null
 
+    @Suppress("UNCHECKED_CAST")
     override fun onTaskCompleted(taskName: String, taskId: Long, task: Task<*, *>, result: Any) {
         when (taskName) {
             LoadTask.NAME,
             DeleteTask.NAME,
             RenameTask.NAME -> {
-                adapter.items = (result!! as List<Connection>)
+                adapter.items = (result as List<Connection>)
                 adapter.notifyDataSetChanged()
                 updateViewState()
             }
         }
     }
 
-    fun updateViewState() {
+    private fun updateViewState() {
         val count = adapter.itemCount
         recycler.visibility = if (count == 0) View.GONE else View.VISIBLE
         emptyText.visibility = if (count == 0) View.VISIBLE else View.GONE

src/musikdroid/app/src/main/java/io/casey/musikcube/remote/ui/activity/SettingsActivity.kt

@@ -173,17 +173,17 @@ class SettingsActivity : WebSocketActivityBase() {
     }
 
     private fun cacheViews() {
-        this.addressText = findViewById<EditText>(R.id.address)
+        this.addressText = findViewById(R.id.address)
-        this.portText = findViewById<EditText>(R.id.port)
+        this.portText = findViewById(R.id.port)
-        this.httpPortText = findViewById<EditText>(R.id.http_port)
+        this.httpPortText = findViewById(R.id.http_port)
-        this.passwordText = findViewById<EditText>(R.id.password)
+        this.passwordText = findViewById(R.id.password)
-        this.albumArtCheckbox = findViewById<CheckBox>(R.id.album_art_checkbox)
+        this.albumArtCheckbox = findViewById(R.id.album_art_checkbox)
-        this.messageCompressionCheckbox = findViewById<CheckBox>(R.id.message_compression)
+        this.messageCompressionCheckbox = findViewById(R.id.message_compression)
-        this.softwareVolume = findViewById<CheckBox>(R.id.software_volume)
+        this.softwareVolume = findViewById(R.id.software_volume)
-        this.bitrateSpinner = findViewById<Spinner>(R.id.transcoder_bitrate_spinner)
+        this.bitrateSpinner = findViewById(R.id.transcoder_bitrate_spinner)
-        this.cacheSpinner = findViewById<Spinner>(R.id.streaming_disk_cache_spinner)
+        this.cacheSpinner = findViewById(R.id.streaming_disk_cache_spinner)
-        this.sslCheckbox = findViewById<CheckBox>(R.id.ssl_checkbox)
+        this.sslCheckbox = findViewById(R.id.ssl_checkbox)
-        this.certCheckbox = findViewById<CheckBox>(R.id.cert_validation)
+        this.certCheckbox = findViewById(R.id.cert_validation)
     }
 
     private fun bindListeners() {
@@ -274,9 +274,9 @@ class SettingsActivity : WebSocketActivityBase() {
     override val playbackServiceEventListener: (() -> Unit)?
         get() = null
 
-    override fun onTaskCompleted(name: String, id: Long, task: Task<*, *>, r: Any) {
+    override fun onTaskCompleted(taskName: String, taskId: Long, task: Task<*, *>, result: Any) {
-        if (SaveAsTask.match(name)) {
+        if (SaveAsTask.match(taskName)) {
-            if ((r as SaveAsTask.Result) == SaveAsTask.Result.Exists) {
+            if ((result as SaveAsTask.Result) == SaveAsTask.Result.Exists) {
                 val connection = (task as SaveAsTask).connection
                 if (!dialogVisible(ConfirmOverwiteDialog.TAG)) {
                     showDialog(
@@ -453,23 +453,17 @@ class SettingsActivity : WebSocketActivityBase() {
     }
 }
 
-private class SaveAsTask : Tasks.Blocking<SaveAsTask.Result, Exception> {
+private class SaveAsTask(val connection: Connection,
-    var connection: Connection
+                         val overwrite: Boolean = false)
-
+    : Tasks.Blocking<SaveAsTask.Result, Exception>()
+{
     enum class Result { Exists, Added }
 
-    val overwrite: Boolean
-
-    constructor(connection: Connection, overwrite: Boolean = false) {
-        this.connection = connection
-        this.overwrite = overwrite
-    }
-
     override fun exec(context: Context?): Result {
         val dao = Application.connectionsDb?.connectionsDao()!!
 
         if (!overwrite) {
-            var existing: Connection? = dao.query(connection.name)
+            val existing: Connection? = dao.query(connection.name)
             if (existing != null) {
                 return Result.Exists
             }

src/musikdroid/app/src/main/java/io/casey/musikcube/remote/ui/activity/WebSocketActivityBase.kt

@@ -116,7 +116,7 @@ abstract class WebSocketActivityBase : AppCompatActivity(), Runner.TaskCallbacks
         return super.onOptionsItemSelected(item)
     }
 
-    override fun onTaskCompleted(s: String, l: Long, task: Task<*, *>, o: Any) {
+    override fun onTaskCompleted(taskName: String, taskId: Long, task: Task<*, *>, result: Any) {
 
     }
 

src/musikdroid/app/src/main/java/io/casey/musikcube/remote/ui/view/MainMetadataView.kt

@@ -3,6 +3,7 @@ package io.casey.musikcube.remote.ui.view
 import android.content.Context
 import android.content.SharedPreferences
 import android.graphics.Color
+import android.os.Handler
 import android.support.annotation.AttrRes
 import android.text.SpannableStringBuilder
 import android.text.TextPaint
@@ -41,7 +42,6 @@ class MainMetadataView : FrameLayout {
     private var prefs: SharedPreferences? = null
 
     private var isPaused = true
-
     private lateinit var title: TextView
     private lateinit var artist: TextView
     private lateinit var album: TextView
@@ -363,7 +363,7 @@ class MainMetadataView : FrameLayout {
 
     private var albumArtRetrieved: (AlbumArtModel, String?) -> Unit = {
             model: AlbumArtModel, _: String? ->
-        handler.post {
+        handler?.post {
             if (model === albumArtModel) {
                 if (Strings.empty(model.url)) {
                     setMetadataDisplayMode(DisplayMode.NoArtwork)

src/musikdroid/app/src/main/java/io/casey/musikcube/remote/websocket/SocketMessage.kt

@@ -38,6 +38,7 @@ class SocketMessage private constructor(val name: String, val id: String, val ty
         this.options = options ?: JSONObject()
     }
 
+    @Suppress("UNCHECKED_CAST")
     fun <T> getOption(key: String): T? {
         if (options.has(key)) {
             try {

src/musikdroid/build.gradle

@@ -1,10 +1,13 @@
 buildscript {
-    ext.kotlin_version = '1.1.4-2'
+    ext.kotlin_version = '1.1.4-3'
+
     repositories {
         jcenter()
+        google()
     }
+
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0-beta3'
+        classpath 'com.android.tools.build:gradle:3.0.0-beta4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }