toward service working on Oreo

Did a bunch of stuff to inherit from JobIntentService and use enqueue(),
but doesn't work yet. OS is unable to bind, with this error:
09-21 17:20:51.678  3050  3050 W JobServiceContext: Time-out while trying to bind 2edee28 #u0a277/1111 org.eehouse.android.xw4dbg/org.eehouse.android.xw4.BTService, dropping.

xwords4/android/app/src/main/AndroidManifest.xml

@@ -179,8 +179,14 @@
     <activity android:name=".loc.LocItemEditActivity"
               />
 
-    <service android:name="RelayService"/>
+    <service android:name="RelayService"
-    <service android:name="BTService"/>
+             android:permission="android.permission.BIND_JOB_SERVICE"
+             android:exported="false"
+             />
+    <service android:name="BTService"
+             android:permission="android.permission.BIND_JOB_SERVICE"
+             android:exported="false"
+             />
     <service android:name="SMSService"/>
 
     <receiver android:name=".MountEventReceiver">

xwords4/android/app/src/main/java/org/eehouse/android/xw4/BTService.java

@@ -29,6 +29,7 @@ import android.bluetooth.BluetoothServerSocket;
 import android.bluetooth.BluetoothSocket;
 import android.content.Context;
 import android.content.Intent;
+import android.support.v4.app.JobIntentService;
 
 import junit.framework.Assert;
 
@@ -228,6 +229,8 @@ public class BTService extends XWService {
     {
         if ( XWApp.BTSUPPORTED ) {
             startService( context, new Intent( context, BTService.class ) );
+            // didn't help
+            // startService( context, new Intent( /*context, BTService.class*/ ) );
         }
     }
 
@@ -317,12 +320,19 @@ public class BTService extends XWService {
 
     private static void startService( Context context, Intent intent )
     {
-        context.startService( intent );
+        Log.d( TAG, "startService(%s)", intent );
+
+        if ( false ) {
+            // requires asking for Manifest.permission.FOREGROUND_SERVICE
+            context.startForegroundService( intent );
+        } else {
+            JobIntentService.enqueueWork( context, BTService.class, 1111, intent );
+        }
     }
 
     private static Intent getIntentTo( Context context, BTAction cmd )
     {
-        Intent intent = new Intent( context, BTService.class );
+        Intent intent = new Intent( /*context, BTService.class*/ );
         intent.putExtra( CMD_KEY, cmd.ordinal() );
         return intent;
     }
@@ -347,6 +357,11 @@ public class BTService extends XWService {
 
     @Override
     public int onStartCommand( Intent intent, int flags, int startId )
+    {
+        return handleCommand( intent );
+    }
+
+    private int handleCommand( Intent intent )
     {
         int result;
         if ( XWApp.BTSUPPORTED && null != intent ) {
@@ -433,7 +448,14 @@ public class BTService extends XWService {
             result = Service.START_STICKY_COMPATIBILITY;
         }
         return result;
-    } // onStartCommand()
+    } // handleCommand()
+
+    @Override
+    protected void onHandleWork( Intent intent )
+    {
+        Log.e( TAG, "onHandleWork(%s)", intent );
+        /*(void)*/handleCommand( intent );
+    }
 
     private class BTListenerThread extends Thread {
         private BluetoothServerSocket m_serverSocket;

xwords4/android/app/src/main/java/org/eehouse/android/xw4/BoardView.java

@@ -46,7 +46,6 @@ public class BoardView extends View implements BoardHandler, SyncedDraw {
 
     private static final float MIN_FONT_DIPS = 10.0f;
     private static final int MULTI_INACTIVE = -1;
-    private static final int VERSION_CODES_N = 24; // until we're building on SDK 24...
 
     private static boolean s_isFirstDraw;
     private static int s_curGameID;
@@ -205,7 +204,7 @@ public class BoardView extends View implements BoardHandler, SyncedDraw {
         synchronized( this ) {
             if ( layoutBoardOnce() && m_measuredFromDims ) {
                 Bitmap bitmap = s_bitmap;
-                if ( Build.VERSION.SDK_INT >= VERSION_CODES_N ) {
+                if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.N ) {
                     bitmap = Bitmap.createBitmap(bitmap);
                 }
                 canvas.drawBitmap( bitmap, 0, 0, new Paint() );

xwords4/android/app/src/main/java/org/eehouse/android/xw4/DbgUtils.java

@@ -25,7 +25,6 @@ import android.content.Intent;
 import android.database.Cursor;
 import android.database.DatabaseUtils;
 import android.os.Bundle;
-import android.os.Looper;
 import android.text.TextUtils;
 import android.text.format.Time;
 
@@ -103,7 +102,7 @@ public class DbgUtils {
 
     public static void assertOnUIThread()
     {
-        Assert.assertTrue( Looper.getMainLooper().equals(Looper.myLooper()) );
+        Assert.assertTrue( Utils.isOnUIThread() );
     }
 
     public static void printStack( String tag, StackTraceElement[] trace )

xwords4/android/app/src/main/java/org/eehouse/android/xw4/NetStateCache.java

@@ -54,19 +54,23 @@ public class NetStateCache {
 
     public static void register( Context context, StateChangedIf proc )
     {
+        if ( Utils.isOnUIThread() ) {
             initIfNot( context );
             synchronized( s_ifs ) {
                 s_ifs.add( proc );
             }
         }
+    }
 
     public static void unregister( Context context, StateChangedIf proc )
     {
+        if ( Utils.isOnUIThread() ) {
             initIfNot( context );
             synchronized( s_ifs ) {
                 s_ifs.remove( proc );
             }
         }
+    }
 
     static long s_lastNetCheck = 0;
     public static boolean netAvail( Context context )

xwords4/android/app/src/main/java/org/eehouse/android/xw4/RelayService.java

@@ -25,6 +25,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Handler;
+import android.support.v4.app.JobIntentService;
 import android.text.TextUtils;
 
 import junit.framework.Assert;
@@ -192,13 +193,25 @@ public class RelayService extends XWService
     {
         Log.i( TAG, "startService()" );
         Intent intent = getIntentTo( context, MsgCmds.UDP_CHANGED );
-        context.startService( intent );
+        startService( context, intent );
+    }
+
+    private static void startService( Context context, Intent intent )
+    {
+        Log.d( TAG, "startService(%s)", intent );
+
+        if ( false ) {
+            // requires asking for Manifest.permission.FOREGROUND_SERVICE
+            context.startForegroundService( intent );
+        } else {
+            JobIntentService.enqueueWork( context, RelayService.class, 1112, intent );
+        }
     }
 
     private static void stopService( Context context )
     {
         Intent intent = getIntentTo( context, MsgCmds.STOP );
-        context.startService( intent );
+        startService( context, intent );
     }
 
     public static void inviteRemote( Context context, int destDevID,
@@ -206,7 +219,7 @@ public class RelayService extends XWService
     {
         int myDevID = DevID.getRelayDevIDInt( context );
         if ( 0 != myDevID ) {
-            context.startService( getIntentTo( context, MsgCmds.INVITE )
+            startService( context, getIntentTo( context, MsgCmds.INVITE )
                                   .putExtra( DEV_ID_SRC, myDevID )
                                   .putExtra( DEV_ID_DEST, destDevID )
                                   .putExtra( RELAY_ID, relayID )
@@ -217,13 +230,13 @@ public class RelayService extends XWService
     public static void reset( Context context )
     {
         Intent intent = getIntentTo( context, MsgCmds.RESET );
-        context.startService( intent );
+        startService( context, intent );
     }
 
     public static void timerFired( Context context )
     {
         Intent intent = getIntentTo( context, MsgCmds.TIMER_FIRED );
-        context.startService( intent );
+        startService( context, intent );
     }
 
     public static int sendPacket( Context context, long rowid, byte[] msg )
@@ -234,7 +247,7 @@ public class RelayService extends XWService
             Intent intent = getIntentTo( context, MsgCmds.SEND )
                 .putExtra( ROWID, rowid )
                 .putExtra( BINBUFFER, msg );
-            context.startService( intent );
+            startService( context, intent );
             result = msg.length;
         } else {
             Log.w( TAG, "sendPacket: network down" );
@@ -251,7 +264,7 @@ public class RelayService extends XWService
                 .putExtra( ROWID, rowid )
                 .putExtra( RELAY_ID, relayID )
                 .putExtra( BINBUFFER, msg );
-            context.startService( intent );
+            startService( context, intent );
             result = msg.length;
         }
         return result;
@@ -287,7 +300,7 @@ public class RelayService extends XWService
             Intent intent = getIntentTo( context, MsgCmds.RECEIVE )
                 .putExtra( ROWID, rowid )
                 .putExtra( BINBUFFER, msg );
-            context.startService( intent );
+            startService( context, intent );
         } else {
             Log.w( TAG, "postData(): Dropping message for rowid %d:"
                    + " not on device", rowid );
@@ -305,14 +318,14 @@ public class RelayService extends XWService
         Intent intent = getIntentTo( context, MsgCmds.PROCESS_GAME_MSGS )
             .putExtra( MSGS_ARR, msgs64 )
             .putExtra( RELAY_ID, relayId );
-        context.startService( intent );
+        startService( context, intent );
     }
 
     public static void processDevMsgs( Context context, String[] msgs64 )
     {
         Intent intent = getIntentTo( context, MsgCmds.PROCESS_DEV_MSGS )
             .putExtra( MSGS_ARR, msgs64 );
-        context.startService( intent );
+        startService( context, intent );
     }
 
     private static Intent getIntentTo( Context context, MsgCmds cmd )
@@ -355,9 +368,45 @@ public class RelayService extends XWService
 
     @Override
     public int onStartCommand( Intent intent, int flags, int startId )
+    {
+        Integer result = handleCommand( intent );
+
+        if ( null == result ) {
+            result = Service.START_STICKY_COMPATIBILITY;
+        }
+
+        NetStateCache.register( this, this );
+        resetExitTimer();
+        return result;
+    }
+
+    @Override
+    public void onDestroy()
+    {
+        if ( shouldMaintainConnection() ) {
+            long interval_millis = getMaxIntervalSeconds() * 1000;
+            RelayReceiver.setTimer( this, interval_millis );
+        }
+        stopThreads();
+        super.onDestroy();
+    }
+
+    @Override
+    protected void onHandleWork( Intent intent )
+    {
+        Log.e( TAG, "onHandleWork(%s)", intent );
+        handleCommand( intent );
+    }
+
+    // NetStateCache.StateChangedIf interface
+    public void onNetAvail( boolean nowAvailable )
+    {
+        startService( this ); // bad name: will *stop* threads too
+    }
+
+    private Integer handleCommand( Intent intent )
     {
         Integer result = null;
-        if ( null != intent ) {
         MsgCmds cmd;
         try {
             cmd = MsgCmds.values()[intent.getIntExtra( CMD_STR, -1 )];
@@ -443,34 +492,9 @@ public class RelayService extends XWService
 
             result = Service.START_STICKY;
         }
-        }
-
-        if ( null == result ) {
-            result = Service.START_STICKY_COMPATIBILITY;
-        }
-
-        NetStateCache.register( this, this );
-        resetExitTimer();
         return result;
     }
 
-    @Override
-    public void onDestroy()
-    {
-        if ( shouldMaintainConnection() ) {
-            long interval_millis = getMaxIntervalSeconds() * 1000;
-            RelayReceiver.setTimer( this, interval_millis );
-        }
-        stopThreads();
-        super.onDestroy();
-    }
-
-    // NetStateCache.StateChangedIf interface
-    public void onNetAvail( boolean nowAvailable )
-    {
-        startService( this ); // bad name: will *stop* threads too
-    }
-
     private void setupNotifications( String[] relayIDs, BackMoveResult[] bmrs,
                                      ArrayList<Boolean> locals )
     {

xwords4/android/app/src/main/java/org/eehouse/android/xw4/Utils.java

@@ -40,6 +40,7 @@ import android.media.Ringtone;
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.Build;
+import android.os.Looper;
 import android.provider.ContactsContract.PhoneLookup;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.content.FileProvider;
@@ -533,6 +534,11 @@ public class Utils {
         return result;
     }
 
+    public static boolean isOnUIThread()
+    {
+        return Looper.getMainLooper().equals(Looper.myLooper());
+    }
+
     public static String base64Encode( byte[] in )
     {
         return Base64.encodeToString( in, Base64.NO_WRAP );

xwords4/android/app/src/main/java/org/eehouse/android/xw4/XWService.java

@@ -23,7 +23,9 @@ package org.eehouse.android.xw4;
 import android.app.Service;
 import android.content.Context;
 import android.content.Intent;
+import android.os.Build;
 import android.os.IBinder;
+import android.support.v4.app.JobIntentService;
 
 import junit.framework.Assert;
 
@@ -37,7 +39,7 @@ import org.eehouse.android.xw4.jni.UtilCtxtImpl;
 import java.util.HashSet;
 import java.util.Set;
 
-abstract class XWService extends Service {
+abstract class XWService extends JobIntentService {
     private static final String TAG = XWService.class.getSimpleName();
     public static enum ReceiveResult { OK, GAME_GONE, UNCONSUMED };
 
@@ -46,10 +48,21 @@ abstract class XWService extends Service {
 
     private UtilCtxt m_utilCtxt;
 
+    // @Override
+    // public IBinder onBind( Intent intent )
+    // {
+    //     IBinder result = null;
+    //     if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ) {
+    //         result = super.onBind( intent );
+    //     }
+    //     return result;
+    // }
+
     @Override
-    public IBinder onBind( Intent intent )
+    protected void onHandleWork(Intent intent)
     {
-        return null;
+        Log.e( TAG, "%s.onHandleWork(%s); dropping!!!", getClass().getSimpleName(),
+               intent );
     }
 
     public final static void setListener( MultiService.MultiEventListener li )