# Android Build fail with Foreign Code **URL:** \ **Category:** How-to Discussions\ **Created:** [March 26, 2016, 8:02pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308 "2016-03-26T20:02:50Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![kyawlay.it](https://avatars.discourse-cdn.com/v4/letter/k/90ced4/32.png) [@kyawlay.it](https://forums.fusetools.com/u/kyawlay.it)\ **Post date:** [March 26, 2016, 8:02pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/1 "2016-03-26T20:02:50Z")
I created a uno class with foreign code to call phone. I know that Phone.call(PHONE) method can call but it cannot be chosen SIM in dual SIM handsets. so I made my own Phone call class as follow. My problem is I cannot build app for android. I have no idea where is wrong. Please Help me. ```auto using Uno; using Uno.Collections; using Fuse; using Fuse.Scripting; using Uno.Compiler.ExportTargetInterop; using Android.android.app; public class InstantCaller : NativeModule { public InstantCaller() { AddMember(new NativeFunction("call", (NativeCallback)call)); } string phNumber; object call(Context c, object[] args) { //debug_log(args[0].ToString()); phNumber=args[0] as string; debug_log("phone to be called "); debug_log(phNumber); if(defined(Android)){ UpdateManager.PostAction(callAndroid); } else if(defined(IOS)){ UpdateManager.PostAction(callIOS); } return null; } [Foreign(Language.Java)] public extern(Android) void callAndroid() @{ var ctx = Android.android.app.Activity.GetAppActivity(); Android.java.lang.String a_ph = phNumber; android.content.Intent intent = new android.content.Intent(android.content.Intent.ACTION_CALL, android.net.Uri.parse("tel:"+ android.net.Uri.encode(a_ph))); ctx.startActivity(intent); @} [Foreign(Language.ObjC)] public extern(iOS) void callIOS() @{ // not implemented yet @} } ``` ---
**Author:** ![Anders\_Lassen](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/anders_lassen/32/522_2.png) [@Anders\_Lassen](https://forums.fusetools.com/u/Anders_Lassen)\ **Post date:** [March 28, 2016, 10:37pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/2 "2016-03-28T22:37:43Z")
Hi! It would be quicker to help if you can provide the error messages you are getting. ---
**Author:** ![kyawlay.it](https://avatars.discourse-cdn.com/v4/letter/k/90ced4/32.png) [@kyawlay.it](https://forums.fusetools.com/u/kyawlay.it)\ **Post date:** [March 29, 2016, 1:25pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/3 "2016-03-29T13:25:36Z")
Yes I found that phNumber cannot be accessed from foreign scope ![file](https://s3.us-east-2.amazonaws.com/fuse-legacy-forum-assets/sRWNoL4gBu4L-legacy-files-X2vpeAZYUF3Kxily--CvH4jeC1q7HpDk5bTm8ydRU.PNG) ---
**Author:** ![Anders\_Lassen](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/anders_lassen/32/522_2.png) [@Anders\_Lassen](https://forums.fusetools.com/u/Anders_Lassen)\ **Post date:** [April 1, 2016, 9:58am UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/4 "2016-04-01T09:58:58Z")
That’s right, you need to pass in all variables you need as arguments ---
**Author:** ![kyawlay.it](https://avatars.discourse-cdn.com/v4/letter/k/90ced4/32.png) [@kyawlay.it](https://forums.fusetools.com/u/kyawlay.it)\ **Post date:** [April 2, 2016, 9:57pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/5 "2016-04-02T21:57:20Z")
I’ve read Foreign code tutorials, But I don’t understand what you say. Please let me know how to pass in all variables to foreign code. ---
**Author:** ![Baggers](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.fusetools.com/baggers/32/665_2.png) [@Baggers](https://forums.fusetools.com/u/Baggers)\ **Post date:** [April 12, 2016, 12:01pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/6 "2016-04-12T12:01:28Z")
Hi kyawlay, Sorry for the confusion, fields can be accessed by using the following ```auto public class NativeTest { public NativeTest() { DoFieldStuff(); } // static fields static int _someField0; static Java.Object _someField1; // instance fields int _someField2; Java.Object _someField3; Java.Object _someProperty { get; set; } [Foreign(Language.Java)] public extern(android) void DoFieldStuff() @{ debug_log("--------\nbunch of field accessing\n\n"); debug_log(@{_someField0}); debug_log(@{_someField0:Get()}); debug_log(@{_someField1}); debug_log(@{_someField1:Get()}); debug_log(@{NativeTest:Of(_this)._someField2}); debug_log(@{NativeTest:Of(_this)._someField2:Get()}); debug_log(@{NativeTest:Of(_this)._someField3}); debug_log(@{NativeTest:Of(_this)._someField3:Get()}); debug_log(@{NativeTest:Of(_this)._someProperty:Get()}); debug_log("---------"); @} } ``` Of course it may just be easier to pass them as arguments like this: ```auto public class NativeTest { public NativeTest() { DoFieldStuff(_someField0, _someField1); DoFieldStuff(_someField2, _someField3); } // static fields static int _someField0; static Java.Object _someField1; // instance fields int _someField2; Java.Object _someField3; [Foreign(Language.Java)] public extern(android) void DoFieldStuff(int a, Java.Object b) @{ debug_log("--------"); debug_log(a); debug_log(b); debug_log("---------"); @} } ``` ---
**Author:** ![kyawlay.it](https://avatars.discourse-cdn.com/v4/letter/k/90ced4/32.png) [@kyawlay.it](https://forums.fusetools.com/u/kyawlay.it)\ **Post date:** [April 22, 2016, 7:20pm UTC](https://forums.fusetools.com/t/android-build-fail-with-foreign-code/3308/7 "2016-04-22T19:20:49Z")
Thank you very much for detail explanation