Show the soft keyboard provided by Android without a text field

for pure text input for editing the name of the savegame.

project/jni/application/opentyrian/src/mainint.cpp

@@ -48,6 +48,8 @@
 #include "vga256d.h"
 #include "video.h"
 
+#include "SDL_screenkeyboard.h"
+
 #include <assert.h>
 #include <ctype.h>
 
@@ -2398,7 +2400,9 @@ void JE_operation( JE_byte slot )
 		wait_noinput(false, true, false);
 
 		JE_barShade(VGAScreen, 65, 55, 255, 155);
-
+#ifdef ANDROID
+		SDL_ANDROID_CallJavaTogglePlainAndroidSoftKeyboardInput();
+#endif
 		bool quit = false;
 		while (!quit)
 		{
@@ -2510,6 +2514,9 @@ void JE_operation( JE_byte slot )
 					case SDLK_RETURN:
 					case SDLK_SPACE:
 						quit = true;
+#ifdef ANDROID
+						SDL_ANDROID_CallJavaTogglePlainAndroidSoftKeyboardInput();
+#endif
 						JE_saveGame(slot, stemp);
 						JE_playSampleNum(S_SELECT);
 						break;