android fragment 切换_android fragment切换

private fun switchFragment(fm: Fragment) {
        val tag = fm::class.java.simpleName
        val fmFinal = supportFragmentManager.findFragmentByTag(tag) ?: fm
        if (currentFragment == fmFinal) return
        val transaction = supportFragmentManager.beginTransaction()
        currentFragment?.let { transaction.hide(it) }
        if (fmFinal.isAdded) {
            transaction.show(fmFinal)
        } else {
            transaction.add(R.id.fragmentContainer, fmFinal, tag)
        }
        transaction.commitAllowingStateLoss()
        currentFragment = fmFinal
    }
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