How do I have two methods in kotlin file?

Android
1

Right now in my kt file I’m trying to run verifyUserLoggedIn method in my UserHomeActivity. But my issue is verifyUserLoggedIn is crashing my app upon starting up. If I remove verifyUserLoggedIn() and whole line of code for private fun verifyUserLoggedIn() , my app will start up and run as normal. What am I doing wrong? I’m pretty sure I am implementing verifyUserLoggedIn() wrong. I’m new to kotlin coding and unsure how to get two or more methods in one kotlin file.

`class UserHomeActvitiy : AppCompatActivity() {`

    private lateinit var homebtn: ImageButton
    private lateinit var searchbtn: ImageButton
    private lateinit var personbtn: ImageButton
    private lateinit var settingsbtn: ImageButton
    private lateinit var mViewPager: ViewPager
    private lateinit var mPagerAdapter: PagerAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_userhome)

        verifyUserLoggedIn()
    }

    private fun verifyUserLoggedIn() {
        val uid = FirebaseAuth.getInstance().uid
        if (uid == null) {
            val intent = Intent(this, RegisterActivity::class.java)
            intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TASK.or(Intent.FLAG_ACTIVITY_NEW_TASK)
            startActivity(intent)
        }

        mViewPager = findViewById(R.id.mViewPager)
        //image button
        homebtn = findViewById(R.id.homebtn)
        searchbtn = findViewById(R.id.searchbtn)
        personbtn = findViewById(R.id.personbtn)
        settingsbtn = findViewById(R.id.settingsbtn)

        //onclick listener

        homebtn.setOnClickListener {
            mViewPager.currentItem = 0

        }

        searchbtn.setOnClickListener {

            mViewPager.currentItem = 1

        }

        personbtn.setOnClickListener {
            mViewPager.currentItem = 2

        }

        settingsbtn.setOnClickListener {
            mViewPager.currentItem = 3

        }

        mPagerAdapter = PagerAdapater(supportFragmentManager)
        mViewPager.adapter = mPagerAdapter
        mViewPager.offscreenPageLimit = 3

        mViewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
            override fun onPageScrolled(
                position: Int,
                positionOffset: Float,
                positionOffsetPixels: Int
            ) {

            }

            override fun onPageSelected(position: Int) {
                changeTabs(position)
            }

            override fun onPageScrollStateChanged(state: Int) {}
        })

        //default screen
        mViewPager.currentItem = 0
        homebtn.setImageResource(R.drawable.ic_home_orange)

    }

    private fun changeTabs(position: Int) {


        if (position == 0) {
            homebtn.setImageResource(R.drawable.ic_home_orange)
            searchbtn.setImageResource(R.drawable.ic_search_black)
            personbtn.setImageResource(R.drawable.ic_person_black)
            settingsbtn.setImageResource(R.drawable.ic_settings_black)

        }
        if (position == 1) {
            homebtn.setImageResource(R.drawable.ic_home_black)
            searchbtn.setImageResource(R.drawable.ic_search_orange)
            personbtn.setImageResource(R.drawable.ic_person_black)
            settingsbtn.setImageResource(R.drawable.ic_settings_black)

        }
        if (position == 2) {
            homebtn.setImageResource(R.drawable.ic_home_black)
            searchbtn.setImageResource(R.drawable.ic_search_black)
            personbtn.setImageResource(R.drawable.ic_person_orange)
            settingsbtn.setImageResource(R.drawable.ic_settings_black)

        }
        if (position == 3) {
            homebtn.setImageResource(R.drawable.ic_home_black)
            searchbtn.setImageResource(R.drawable.ic_search_black)
            personbtn.setImageResource(R.drawable.ic_person_black)
            settingsbtn.setImageResource(R.drawable.ic_settings_orange)
        }
    }
}
2

Error logs would be really helpful whenever posting a question asking why code is crashing, just for the future.

One thing that jumps out at me is that you have your Views declared as lateinit – which is totally fine – but findViewById(Int) is a Java method which is not annotated with @NonNull. This means that if any one of those calls to findViewById(Int) returns a null (i.e. the Activity can’t find the View), you will try to assign null to a non-null object which will throw an exception and crash the app. I’d step through those assignments in a debugger to see if that’s the cause.

Just to cover all my bases, Java methods annotated with @NonNull (or any of the other variants) does not enforce that the method return a non-null value. The Java compiler doesn’t really have a way to enforce that a non-null value is returned from a method annotated @NonNull. The best it can do is give you a warning. Of course, if whoever wrote the method annotated it with @NonNull and then returns a null value from that method, that’s their fault and they need to fix it.