dwindows for Android

[PierceNg]

Continuing from the 'GTK3 proposal' thread, another baby step taken! I've now gotten my littlest demo to run on Android, on emulator and phone. Emulator screenshot attached.

Some notes:

- Android Studio uses Gradle as its build system. For 'native' projects, Gradle calls CMake. I can't quite get CMake to run FPC cross compiler from within Android Studio yet. So I build the Pascal shared library using shell script, then have CMake incorporate the shared library into the final artefact.

- For 32-bit ARM, the Gnu binutils cross linker is not able to produce the Pascal shared library:

Code: Text  [Select][+][-]

1. Assembling dwindows
2. Assembling dwprunner
3. Linking armeabi-v7a/libdwprunner.so
4. /home/pierce/pkg/cross/arm-linux-androideabi/bin/arm-linux-androideabi-ld.bfd: error:
5. source object /home/pierce/pkg/android/sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/arm-linux-androideabi/29/crtbegin_so.o
6. has EABI version 5, but target armeabi-v7a/libdwprunner.so has EABI version 0

 
But:

Code: Text  [Select][+][-]

1. % file *.o
2. dwindows.o:  ELF 32-bit LSB relocatable, ARM, EABI5 version 1 (SYSV), not stripped
3. dwprunner.o: ELF 32-bit LSB relocatable, ARM, EABI5 version 1 (SYSV), not stripped

So I have no idea what's happening here.

I'll look into iOS next.

Edit: iOS thread here: https://forum.lazarus.freepascal.org/index.php/topic,61621.0.html

[PierceNg]

Coming back to this after a (long) break, I've now built a demo/exercise app using a webview widget for the user interface, with bidirectional Javascript-Pascal in-process RPC.

The main body of the code loads in-app static content, then binds the names 'HostSayHello' and 'HostExit' for callback to Pascal code from Javascript. Said Pascal code in turns invokes Javascript to manipulate the DOM.

Code: Pascal  [Select][+][-]

1.   webwidget := dw_html_new(1001); // 1001 is an identifier
2.   if webwidget <> nil then
3.     begin
4.       dw_box_pack_start(mainwindow, webwidget, 0, 0, DW_TRUE, DW_TRUE, 0);
5.       dw_html_url(webwidget, 'file:///android_asset/index.html');
6.       dw_html_javascript_add(webwidget, 'HostSayHello');
7.       dw_html_javascript_add(webwidget, 'HostExit');
8.       dw_signal_connect(webwidget, DW_SIGNAL_HTML_MESSAGE, @html_message_callback, nil);
9.     end;

Screenshot of the app running in Android emulator attached.