javascript - ClassNotFoundException in NativeScript using .extend() -

i trying extend googleapiclient.connectioncallbacks(), keep getting error

`java.lang.runtimeexception: unable start activity componentinfo{org.nativescript.samplegroceries/com.tns.nativescriptactivity}: com.tns.nativescriptexception: calling js method oncreate failed

error calling module function

error: java.lang.classnotfoundexception: com.google.android.gms.common.api.googleapiclient_connectioncallbacks java.lang.class.classforname(native method) java.lang.class.forname(class.java:324) java.lang.class.forname(class.java:285) com.tns.dexfactory.generatedex(dexfactory.java:262) com.tns.dexfactory.resolveclass(dexfactory.java:120) com.tns.classresolver.resolveclass(classresolver.java:45)

`

my corresponding code is

var googleapiclient = com.google.android.gms.common.api.googleapiclient; var myconnectioncallbacks = googleapiclient.connectioncallbacks.extend({ onconnected: function(connectionhint){     var messagelistener = messagelistener.extend({             onfound: function(message){                 log.d("message", "found message :) ");             },             onlost: function(message){                 log.d("message", "lost message :( ");             }       });     var mmessagelistener = new messagelistener();  }, onconnectionsuspended: function(){}  });     var messagesoptionsbuilder = new com.google.android.gms.nearby.messages.messagesoptions.builder().setpermissions(nearbypermissions.ble).build();     var test = new googleapiclient.builder(context).addapi(nearby.messages_api, messagesoptionsbuilder);     test.addconnectioncallbacks(new myconnectioncallbacks(this)); 

maybe misunderstood docs? https://docs.nativescript.org/runtimes/android/generator/extend-class-interface

edit: why there underscore in error log after googleapiclient?

any suggestions wrong?

the problem here trying extend interface wrong . more info -> https://docs.nativescript.org/runtimes/android/generator/extend-class-interface#interfaces

var messagesoptionsbuilder = new com.google.android.gms.nearby.messages.messagesoptions.builder().setpermissions(nearbypermissions.ble).build(); var test = new googleapiclient.builder(context).addapi(nearby.messages_api, messagesoptionsbuilder); test.addconnectioncallbacks(new com.google.android.gms.common.api.googleapiclient.connectioncallbacks({     onconnected: function (connectionhint) {         var messagelistener = messagelistener.extend({             onfound: function (message) {                 console.log(found message :) ");             },             onlost: function (message) {                 console.log("lost message :( ");             }           });         var mmessagelistener = new messagelistener();      },     onconnectionsuspended: function () { }  })); 

and incase messagelistener interface remove .extend

var messagesoptionsbuilder = new com.google.android.gms.nearby.messages.messagesoptions.builder().setpermissions(nearbypermissions.ble).build(); var test = new googleapiclient.builder(context).addapi(nearby.messages_api, messagesoptionsbuilder); test.addconnectioncallbacks(new com.google.android.gms.common.api.googleapiclient.connectioncallbacks({     onconnected: function (connectionhint) {         new messagelistener({             onfound: function (message) {                 console.log(found message :) ");             },             onlost: function (message) {                 console.log("lost message :( ");             }           });      },     onconnectionsuspended: function () { }  }));