Bottom Navigation과 ViewPager 연결하기

Bottom Navigation과 ViewPager 연결하기

viewpager의 상태를 bottom navagation에 반영

viewpager.onPageChangeListener {
    onPageSelected {
        navigation.menu.getItem(it).setChecked(true)
    }
}

document: https://developer.android.com/reference/android/support/v4/view/ViewPager.OnPageChangeListener

*변경된 함수

viewpager?.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {

    override fun onPageScrollStateChanged(state: Int) {
    }

    override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {

    }
    override fun onPageSelected(position: Int) {
        navigation.menu.getItem(position).setChecked(true)
    }

})

bottom naviation의 상태를 viewpager에 반영

private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
    when (item.itemId) {
        R.id.navigation_first -> {
            setPageIndex(0)
            return@OnNavigationItemSelectedListener true
        }
        R.id.navigation_second -> {
            setPageIndex(1)
            return@OnNavigationItemSelectedListener true
        }
        R.id.navigation_third -> {
            setPageIndex(2)
            return@OnNavigationItemSelectedListener true
        }
    }
    false
}

override fun setPageIndex(index: Int) {
    viewpager?.currentItem = index
}

참고: https://droidmentor.com/bottomnavigationview-with-viewpager-android/