how to use foreign code

How-to Discussions
1

Hi fuse. I am trying to figure out how to use foreign code. this is the code i wrote to get print out some text using Log.d .
can anyone please help me to figure this out. i really want to learn this and i will write some community libraries after that.
Thank you…

my uno file - (CallLog.uno)

using Uno.Threading;
using Uno;
using Uno.UX;
using Uno.Compiler.ExportTargetInterop;
using Android;
using Uno.Permissions;
using Fuse;
using Fuse.Scripting;

[extern(Android) ForeignInclude(Language.Java, "android.content.Context")]

[UXGlobalModule]
public class CallLog : NativeModule{
    public CallLog(){
        AddMember(new NativeFunction("callHistory",(NativeCallback)callHistory));
    }

    object callHistory(Context c, object[] args){
        callHistory();
        return null;
    }

    [Foreign(Language.Java)]
    public static extern(Android) void callHistory()
    @{  

        android.util.Log.d("ForeignCodeExample","hi");

    @}      

    static extern(!Android) void callHistory(){
        debug_log("Notifications not supported on this platform.");
    }

}

my ux file

<App>
    <DockPanel>
        <StatusBarBackground Dock="Top" />
        <BottomBarBackground Dock="Bottom" />

        <CallLog ux:Global="CallLog" />

        <JavaScript>
            var Observable = require("FuseJS/Observable");
            var Log = require("CallLog");
            var val = Observable("");

            function call() {
                Log.callHistory();
            }
            module.exports = {call};

        </JavaScript>
        <Panel Height="60" Width="200">
        <Rectangle Color="Blue">
            <Clicked Handler="{call}" />
        </Rectangle>
        </Panel>
    </DockPanel>
</App>

my unoproj file -

{
  "RootNamespace":"",
  "Packages": [
    "Fuse",
    "FuseJS",
    "Uno.Permissions"
  ],
  "Includes": [
    "*",
    "*.uno"
  ]
}
2

I am also having a problem with the foreign code. Hope this answer will help me. I really appreciate if you can improve the foreign code documentation with good examples.

3

Pretty decent attempt right there, and I’m wondering if there was any particular issues you wanted to ask about?

There’s a couple suggestions I have:

  1. You don’t need the "*.uno" line in .unoproj, because "*" already includes all .uno files.
  2. Global modules need to register an instance (showing in code below).
  3. You should use a bit better naming for the methods, and avoid using the same names for different things (showing in code below).

Other than that, yeah man! Keep going!

using Uno.Threading;
using Uno;
using Uno.UX;
using Uno.Compiler.ExportTargetInterop;
using Android;
using Uno.Permissions;
using Fuse;
using Fuse.Scripting;

[extern(Android) ForeignInclude(Language.Java, "android.content.Context")]

[UXGlobalModule]
public class CallLog : NativeModule{
	static readonly CallLog _instance;
    public CallLog(){

    	if (_instance != null) return;
    	_instance = this;
    	Resource.SetGlobalKey(_instance, "CallLog");

        AddMember(new NativeFunction("callHistory",(NativeCallback)CallHistory));
    }

    object CallHistory(Context c, object[] args){
        CallHistoryImpl();
        return null;
    }

    [Foreign(Language.Java)]
    public static extern(Android) void CallHistoryImpl()
    @{  

        android.util.Log.d("ForeignCodeExample","hi");

    @}      

    static extern(!Android) void CallHistoryImpl(){
        debug_log("Notifications not supported on this platform.");
    }

}
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