android: Loader - load early (before service thread) both in activity and service.

Loader converted from java to kotlin.

Instead of loading libmpd when the service thread is started,
the service will not start the the thread if libmpd failed to load.

The loader is also accessed by the view data to let
the ui adjust if failed to load, by showing the failure reason
and disabling the Start MPD button.

android/app/src/main/java/org/musicpd/Main.kt

@@ -59,6 +59,9 @@ class Main : Service(), Runnable {
         }
     }
 
+    private lateinit var mpdApp: MPDApplication
+    private lateinit var mpdLoader: Loader
+
     private var mThread: Thread? = null
     private var mStatus = MAIN_STATUS_STOPPED
     private var mAbort = false
@@ -104,6 +107,11 @@ class Main : Service(), Runnable {
         }
     }
 
+    override fun onCreate() {
+        super.onCreate()
+        mpdLoader = Loader
+    }
+
     @Synchronized
     private fun sendMessage(
         @Suppress("SameParameterValue") what: Int,
@@ -152,19 +160,6 @@ class Main : Service(), Runnable {
     }
 
     override fun run() {
-        if (!Loader.loaded) {
-            val error = """
-                Failed to load the native MPD library.
-                Report this problem to us, and include the following information:
-                SUPPORTED_ABIS=${java.lang.String.join(", ", *Build.SUPPORTED_ABIS)}
-                PRODUCT=${Build.PRODUCT}
-                FINGERPRINT=${Build.FINGERPRINT}
-                error=${Loader.error}
-                """.trimIndent()
-            setStatus(MAIN_STATUS_ERROR, error)
-            stopSelf()
-            return
-        }
         synchronized(this) {
             if (mAbort) return
             setStatus(MAIN_STATUS_STARTED, null)
@@ -245,7 +240,9 @@ class Main : Service(), Runnable {
                 .setContentIntent(contentIntent)
                 .build()
 
-        mThread = Thread(this).apply { start() }
+        if (mpdLoader.isLoaded) {
+            mThread = Thread(this).apply { start() }
+        }
 
         val player = MPDPlayer(Looper.getMainLooper())
         mMediaSession = MediaSession.Builder(this, player).build()