make known-player stuff conditional

and ifdefs to C and BuildConfig flag to java so the feature can be
hidden in release builds until it's ready.

xwords4/android/app/build.gradle

@@ -86,6 +86,7 @@ android {
             buildConfigField "boolean", "ATTACH_SUPPORTED", "false"
             buildConfigField "boolean", "OFFER_MQTT", "true"
             buildConfigField "boolean", "NON_RELEASE", "DEBUG || !IS_TAGGED_BUILD"
+            buildConfigField "boolean", "HAVE_KNOWN_PLAYERS", "false"
         }
 
         xw4NoSMS {
@@ -135,6 +136,8 @@ android {
             resValue "string", "nfc_aid", "$NFC_AID_XW4d"
             externalNativeBuild.ndkBuild.cFlags += ['-DVARIANT_xw4d']
             externalNativeBuild.ndkBuild.arguments += ['XW_BT_UUID=' + XWD_UUID]
+            externalNativeBuild.ndkBuild.cFlags += ['-DXWFEATURE_KNOWNPLAYERS']
+            buildConfigField "boolean", "HAVE_KNOWN_PLAYERS", "true"
         }
 
         xw4dNoSMS {
@@ -152,6 +155,8 @@ android {
             resValue "string", "nfc_aid", "$NFC_AID_XW4d"
             externalNativeBuild.ndkBuild.cFlags += ['-DVARIANT_xw4dNoSMS']
             externalNativeBuild.ndkBuild.arguments += ['XW_BT_UUID=' + XWD_UUID]
+            externalNativeBuild.ndkBuild.cFlags += ['-DXWFEATURE_KNOWNPLAYERS']
+            buildConfigField "boolean", "HAVE_KNOWN_PLAYERS", "true"
         }
 
         xw4SMS {

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

@@ -60,12 +60,17 @@ public class InviteView extends ScrollView
     {
         Context context = getContext();
 
-        mIsWho = null != players && 0 < players.length;
+        boolean showWho = null != players && 0 < players.length;
 
-        // top/horizontal group first
+        // top/horizontal group or title first
+        if ( showWho ) {
             mGroupTab = (RadioGroup)findViewById( R.id.group_tab );
-        mGroupTab.check(mIsWho ? R.id.radio_who : R.id.radio_how );
+            mGroupTab.check( R.id.radio_who );
             mGroupTab.setOnCheckedChangeListener( this );
+            mGroupTab.setVisibility( View.VISIBLE );
+        } else {
+            findViewById( R.id.title_tab ).setVisibility( View.VISIBLE );
+        }
 
         mGroupHow = (RadioGroup)findViewById( R.id.group_how );
         mGroupHow.setOnCheckedChangeListener( this );
@@ -77,9 +82,9 @@ public class InviteView extends ScrollView
             mHowMeans.put( button, means );
         }
 
+        if ( showWho ) {
             mGroupWho = (RadioGroup)findViewById( R.id.group_who );
             mGroupWho.setOnCheckedChangeListener( this );
-        if ( mIsWho ) {
             for ( String player : players ) {
                 RadioButton button = new RadioButton( context );
                 button.setText( player );
@@ -87,6 +92,7 @@ public class InviteView extends ScrollView
                 mWhoPlayers.put( button, player );
             }
         }
+        mIsWho = showWho;
         showWhoOrHow();
 
         return this;
@@ -146,7 +152,9 @@ public class InviteView extends ScrollView
 
     private void showWhoOrHow()
     {
+        if ( null != mGroupWho ) {
             mGroupWho.setVisibility( mIsWho ? View.VISIBLE : View.INVISIBLE );
+        }
         mGroupHow.setVisibility( mIsWho ? View.INVISIBLE : View.VISIBLE );
 
         boolean showEmpty = mIsWho && 0 == mWhoPlayers.size();

xwords4/android/app/src/main/java/org/eehouse/android/xw4/jni/XwJNI.java

@@ -173,12 +173,16 @@ public class XwJNI {
 
     public static String[] kplr_getPlayers()
     {
-        return kplr_getPlayers( getJNI().m_ptrGlobals );
+        return BuildConfig.HAVE_KNOWN_PLAYERS
+            ? kplr_getPlayers( getJNI().m_ptrGlobals )
+            : null;
     }
 
     public static CommsAddrRec kplr_getAddr( String name )
     {
-        return kplr_getAddr( getJNI().m_ptrGlobals, name );
+        return BuildConfig.HAVE_KNOWN_PLAYERS
+            ? kplr_getAddr( getJNI().m_ptrGlobals, name )
+            : null;
     }
 
     private static void cleanGlobals()

xwords4/android/app/src/main/res/layout/invite_view.xml

@@ -13,11 +13,21 @@
                 android:layout_height="match_parent"
                 >
 
+    <!-- One of these next two will be unhidden -->
+    <TextView android:id="@+id/title_tab"
+              android:layout_width="wrap_content"
+              android:layout_height="wrap_content"
+              android:text="@string/how_tab"
+              android:textAppearance="?android:attr/textAppearanceMedium"
+              android:visibility="gone"
+              />
+
     <RadioGroup android:id="@+id/group_tab"
                 android:orientation="horizontal"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_gravity="center_horizontal"
+                android:visibility="gone"
                 >
       <RadioButton android:id="@+id/radio_who"
                    android:layout_width="wrap_content"

xwords4/android/app/src/main/res/values/strings.xml

@@ -1023,7 +1023,13 @@
     <string name="invite_choice_nfc">NFC (“Android beaming”)</string>
     <string name="invite_choice_relay">Internet/Relay</string>
     <string name="invite_choice_p2p">Wifi Direct</string>
-    <string name="invite_choice_title">Inviting players</string>
+    <string name="invite_choice_title">Inviting a Player</string>
+
+    <!-- Text above choices for how to send invitations == ONLY WHEN
+         there's no choice between how and who. Replaces the how?/who?
+         choice radio group. -->
+    <string name="how_tab">Send invitation how?</string>
+
     <!-- Radio button in invite choices dialog for list of previous opponents -->
     <string name="radio_who">Who?</string>
     <!-- Text shown only when there are not any previous opponents to invite -->
@@ -2375,7 +2381,7 @@
        when chosen -->
     <string name="not_again_clip_expl_fmt">The “%1$s” option copies an
   invitation URL to the clipboard. Paste it into the app of your
-  choice and send it to your friend.</string>
+  choice and share it with a friend.</string>
     <string name="confirm_clear_chat">Are you sure you want to delete
   all chat history for this game?\n\n(This action cannot be
   undone.)</string>

xwords4/android/jni/xwjni.c

@@ -771,6 +771,7 @@ Java_org_eehouse_android_xw4_jni_XwJNI_dvc_1parseMQTTPacket
     DVC_HEADER_END();
 }
 
+# ifdef XWFEATURE_KNOWNPLAYERS
 JNIEXPORT jobjectArray JNICALL
 Java_org_eehouse_android_xw4_jni_XwJNI_kplr_1getPlayers
 ( JNIEnv* env, jclass C, jlong jniGlobalPtr )
@@ -806,6 +807,7 @@ Java_org_eehouse_android_xw4_jni_XwJNI_kplr_1getAddr
     DVC_HEADER_END();
     return jaddr;
 }
+#endif
 
 JNIEXPORT jbyteArray JNICALL
 Java_org_eehouse_android_xw4_jni_XwJNI_gi_1to_1stream

xwords4/common/comms.c

@@ -2595,6 +2595,7 @@ comms_isConnected( const CommsCtxt* const comms )
 void
 comms_gatherPlayers( CommsCtxt* comms, XWEnv xwe )
 {
+#ifdef XWFEATURE_KNOWNPLAYERS
     LOG_FUNC();
     if ( 0 == (comms->flags & FLAG_HARVEST_DONE) ) {
         CommsAddrRec addrs[4] = {{0}};
@@ -2607,6 +2608,10 @@ comms_gatherPlayers( CommsCtxt* comms, XWEnv xwe )
             // comms->flags |= FLAG_HARVEST_DONE;
         }
     }
+#else
+    XP_USE( comms );
+    XP_USE( xwe );
+#endif
 }
 
 #ifdef RELAY_VIA_HTTP

xwords4/common/knownplyr.c

@@ -1,7 +1,6 @@
 /* -*- compile-command: "cd ../linux && make MEMDEBUG=TRUE -j3"; -*- */
 /* 
- * Copyright 2001 - 2020 by Eric House (xwords@eehouse.org).  All rights
+ * Copyright 2020 by Eric House (xwords@eehouse.org).  All rights reserved.
- * reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -23,6 +22,8 @@
 #include "comms.h"
 #include "dbgutil.h"
 
+#ifdef XWFEATURE_KNOWNPLAYERS
+
 typedef struct _KnownPlayer {
     struct _KnownPlayer* next;
     XP_UCHAR* name;
@@ -230,3 +231,4 @@ kplr_cleanup( XW_DUtilCtxt* dutil )
         XP_FREEP( dutil->mpool, state );
     }
 }
+#endif

xwords4/common/knownplyr.h

@@ -27,6 +27,7 @@
 /* XP_UCHAR** knpl_listPlayers( XW_DUtilCtxt* dctxt, uint_t* nNames ); */
 /* void knpl_freePlayers( XW_DUtilCtxt* dctxt, XP_UCHAR** names ); */
 
+# ifdef XWFEATURE_KNOWNPLAYERS
 void kplr_cleanup( XW_DUtilCtxt* dutil );
 
 XP_Bool kplr_havePlayers( XW_DUtilCtxt* dutil, XWEnv xwe );
@@ -38,5 +39,7 @@ XP_Bool kplr_getAddr( XW_DUtilCtxt* dutil, XWEnv xwe, const XP_UCHAR* name,
 
 XP_Bool kplr_addAddrs( XW_DUtilCtxt* dutil, XWEnv xwe, const CurGameInfo* gi,
                        CommsAddrRec addrs[], XP_U16 nAddrs );
-
+# else
+#  define kplr_cleanup( dutil )
+# endif
 #endif

xwords4/linux/Makefile

@@ -166,6 +166,7 @@ DEFINES += -DXWFEATURE_DIRECTIP
 DEFINES += -DXWFEATURE_SLOW_ROBOT -DXWFEATURE_ROBOTPHONIES
 
 DEFINES += -DXWFEATURE_DEVICE
+DEFINES += -DXWFEATURE_KNOWNPLAYERS
 
 # Support device-to-device connection via UDP, e.g. using wifi on a
 # LAN or where the host/server isn't behind a firewall.

xwords4/linux/gtkinvit.c

@@ -56,8 +56,9 @@ typedef struct _GtkInviteState {
 
     GtkWidget* mqttDevID;
 
-    /* Known players */
+#ifdef XWFEATURE_KNOWNPLAYERS
     GtkWidget* knownsCombo;
+#endif
 
     GtkWidget* bgScanButton;
     GtkWidget* okButton;
@@ -99,10 +100,13 @@ handle_ok( GtkWidget* XP_UNUSED(widget), gpointer closure )
     PageData* data = &state->pageData[curPage];
     CommsConnType conType = data->pageType;
 
-    if ( COMMS_CONN_NONE == conType ) {
+    if ( 0 ) {
+#ifdef XWFEATURE_KNOWNPLAYERS
+    } else if ( COMMS_CONN_NONE == conType ) {
         gchar* name =
             gtk_combo_box_text_get_active_text( GTK_COMBO_BOX_TEXT(state->knownsCombo) );
         kplr_getAddr( state->dutil, NULL_XWE, name, state->addr );
+#endif
     } else {
         addr_addType( state->addr, conType );
         switch ( conType ) {
@@ -271,7 +275,7 @@ makeSMSPage( GtkInviteState* state, PageData* data )
     return vbox;
 } /* makeBTPage */
 
-
+#ifdef XWFEATURE_KNOWNPLAYERS
 static GtkWidget*
 makeKnownsPage( GtkInviteState* state, PageData* data )
 {
@@ -301,6 +305,7 @@ makeKnownsPage( GtkInviteState* state, PageData* data )
 
     return vbox;
 }
+#endif
 
 static GtkWidget*
 makeMQTTPage( GtkInviteState* state, PageData* data )
@@ -376,14 +381,14 @@ gtkInviteDlg( GtkGameGlobals* globals, CommsAddrRec* addr,
                       G_CALLBACK(onPageChanged), &state );
 
     PageData* data;
-
+#ifdef XWFEATURE_KNOWNPLAYERS
     if ( kplr_havePlayers( state.dutil, NULL_XWE ) ) {
         data = getNextData( &state, COMMS_CONN_NONE, "Knowns" );
         (void)gtk_notebook_append_page( GTK_NOTEBOOK(state.notebook),
                                         makeKnownsPage( &state, data ),
                                         data->label );
     }
-
+#endif
     data = getNextData( &state, COMMS_CONN_MQTT, "MQTT" );
     (void)gtk_notebook_append_page( GTK_NOTEBOOK(state.notebook),
                                     makeMQTTPage( &state, data ),