# Playing with UNO/JAVA

**URL:** <https://forums.fusetools.com/t/playing-with-uno-java/5976>\
**Category:** How-to Discussions\
**Created:** [November 11, 2017, 10:37pm UTC](https://forums.fusetools.com/t/playing-with-uno-java/5976 "2017-11-11T22:37:30Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![albertogmx91](https://avatars.discourse-cdn.com/v4/letter/a/5fc32e/32.png) [@albertogmx91](https://forums.fusetools.com/u/albertogmx91)\
**Post date:** [November 11, 2017, 10:37pm UTC](https://forums.fusetools.com/t/playing-with-uno-java/5976/1 "2017-11-11T22:37:30Z")

</div>

Hi there, sorry for the trouble, but i will need some help undersanding how connect Java and UNO.

well i have some random code in java.

```auto
/**
 * toast
 */
import com.fuse.Activity;
import android.widget.Toast;
import android.content.Context;
public class Alert {
    public void message(String Text){
       
        
    }
}

```

and some random code in UNO

```auto
using Uno.Threading;
using Uno;
using Uno.Collections;
using Uno.UX;
using Uno.Compiler.ExportTargetInterop;
using Android;
using Uno.Permissions;
using Fuse;
using Fuse.Scripting;
using Fuse.Triggers.Actions;
using Uno.Compiler.ExportTargetInterop;

[extern(Android) ForeignInclude(
    Language.Java,
    "android.content.Context",
    "android.speech.tts.TextToSpeech",
    "android.speech.tts.TextToSpeech.OnInitListener",
    "java.util.Locale")]

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

    	if (_instance != null) return;
    	_instance = this;
    	Resource.SetGlobalKey(_instance, "Basics");
        AddMember(new NativeFunction("voiceReader",(NativeCallback)voiceReader));
    }
    public static extern (!Android) object voiceReader(Context c,object[] text){
        debug_log "Imagina que mandas mensaje: "+text[0];
        text=null;
        return text;
    }
    public static extern (Android) object voiceReader(Context c,object[] text){
        reader();
        return null;
    }
    [Foreign(Language.Java)]
    public extern(Android) static void reader()
	@{
		Alert toast=new Alert();
                toast.message("hola mundo");
	@} 
}

```

the problem is that i cant link these together, what is missing?

```auto
$ fuse build -t=Android -c=Preview
Uno 1.3.2 (build 5946) Windows 10 x64 f04d7e8

Configuring
 (1.0 s)
Compiling syntax tree
 (2.7 s)
Generating code and data
 (5.2 s)
Building Android app

C:\Users\Alberto\Documents\Fuse\Critica\build\Android\Preview\app\src\main\java\com\apps\critica\critica.java:35: error: cla
ss Critica is public, should be declared in a file named Critica.java
public class Critica extends android.support.v7.app.AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCa
llback
       ^

C:\Users\Alberto\Documents\Fuse\Critica\build\Android\Preview\app\src\main\java\com\foreign\Basics.java:40: error: cannot fi
nd symbol
        Alert toast=new Alert();
        ^
  symbol: class Alert

  location: class Basics

C:\Users\Alberto\Documents\Fuse\Critica\build\Android\Preview\app\src\main\java\com\foreign\Basics.java:40: error: cannot fi
nd symbol

        Alert toast=new Alert();

                        ^

  symbol: class Alert

  location: class Basics
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
3 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

Incremental java compilation is an incubating feature.
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAnimatedVectorDrawable2340Library UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72340Library UP-TO-DATE
:app:prepareComAndroidSupportDesign2340Library UP-TO-DATE
:app:prepareComAndroidSupportRecyclerviewV72340Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42340Library UP-TO-DATE
:app:prepareComAndroidSupportSupportVectorDrawable2340Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesBase920Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesBasement920Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesMaps920Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesTasks920Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:incrementalDebugJavaCompilationSafeguard UP-TO-DATE
:app:compileDebugJavaWithJavac
:app:compileDebugJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.).
:app:compileDebugJavaWithJavac FAILED

BUILD FAILED

Total time: 14.369 secs

(15.8 s)

Build completed in 24.68 seconds
    1 error

(unknown): E0200: Android build failed

 

```

---

<div class="post-metadata">

**Author:** ![Uldis](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/uldis/32/657_2.png) [@Uldis](https://forums.fusetools.com/u/Uldis)\
**Post date:** [November 13, 2017, 9:42am UTC](https://forums.fusetools.com/t/playing-with-uno-java/5976/2 "2017-11-13T09:42:28Z")

</div>

Well the `Alert` you’re trying to use in the .uno file lives in a separate .java file. As far as I can tell, you have not included that .java file in the .uno file, hence it throws that error. Perhaps adding the .java file to the `ForeignInclude` would solve the issue at hand.

Please spend some time in our [Foreign code docs](https://www.fusetools.com/docs/native-interop/foreign-code), that should get you going.