MainActivity.kt

package com.github.windsekirun.rxsociallogin.googletest

import android.annotation.SuppressLint
import android.content.Intent
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import com.github.windsekirun.rxsociallogin.RxSocialLogin
import com.github.windsekirun.rxsociallogin.google.GoogleLogin
import io.reactivex.disposables.CompositeDisposable
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    private lateinit var googleLogin: GoogleLogin
    private val compositeDisposable = CompositeDisposable()

    @SuppressLint("SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // listener
        btnLogin.setOnClickListener {
            googleLogin.onLogin()
        }

        googleLogin = GoogleLogin(this)

        // subscribe RxSocialLogin
        val disposable = RxSocialLogin.google(googleLogin)
                .subscribe({
                    txtResult.text = "success! $it"
                }, {
                    txtResult.text = "error"
                })

        // store in CompositeDisposable to prevent memory leak
        compositeDisposable.add(disposable)
    }

    override fun onDestroy() {
        super.onDestroy()
        compositeDisposable.clear()
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        googleLogin.onActivityResult(requestCode, resultCode, data)
    }
}