dwindows for Android
lazarus / 43-Android

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PierceNg · 2022-12-16 12:25

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][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i Assembling
dwindowsAssembling dwprunnerLinking
armeabi-v7a/libdwprunner.so/home/pierce/pkg/cross/arm-linux-
androideabi/bin/arm-linux-androideabi-ld.bfd: error: source object /ho
me/pierce/pkg/android/sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/li
nux-x86_64/sysroot/usr/lib/arm-linux-androideabi/29/crtbegin_so.o has
EABI version 5, but target armeabi-v7a/libdwprunner.so has EABI
version 0 
But:
Code: Text  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i % file
*.odwindows.o:  ELF 32-bit LSB relocatable, ARM, EABI5 version 1
(SYSV), not strippeddwprunner.o: ELF 32-bit LSB relocatable, ARM,
EABI5 version 1 (SYSV), not strippedSo 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

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PierceNg · 2024-04-19 08:54

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][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i   webwidget
:= dw_html_new(1001); // 1001 is an identifier  if webwidget <> nil
then    begin      dw_box_pack_start(mainwindow, webwidget, 0, 0,
DW_TRUE, DW_TRUE, 0);      dw_html_url(webwidget,
'file:///android_asset/index.html');     
dw_html_javascript_add(webwidget, 'HostSayHello');     
dw_html_javascript_add(webwidget, 'HostExit');     
dw_signal_connect(webwidget, DW_SIGNAL_HTML_MESSAGE,
@html_message_callback, nil);    end;
Screenshot of the app running in Android emulator attached.