android - 我在父fragment1中有子Fragment2，我想在单击后更改 fragment ，而在下次按下时要更改 fragment ，我想关闭 Activity 吗？

Question

用于更改子fragment2(fragment 1父片段中的容器)

       view.isFocusableInTouchMode = true
    view.requestFocus()
    view.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
        if (keyCode == KeyEvent.KEYCODE_BACK && event.action == KeyEvent.ACTION_UP) {
            childFragmentManager!!.popBackStack(null,FragmentManager.POP_BACK_STACK_INCLUSIVE)

            return@OnKeyListener true
        }

        false
    })

结束 Activity

override fun onBackPressed() {
    if (doubleBackToExitOnce) {
        super.onBackPressed()
            finishAffinity()
        return
    }

    this.doubleBackToExitOnce = true

    Toast.makeText(applicationContext, "Press again to exit ", Toast.LENGTH_SHORT).show()

    Handler().postDelayed({
        kotlin.run { doubleBackToExitOnce = false }
    }, 2000)
}

在这种情况下，我只能更改子片段，而无法关闭 Activity

Answer 1

getActivity()
                    .getSupportFragmentManager()
                    .beginTransaction()
                    .remove(getSupportFragmentManager().findFragmentById(R.id.container)).commit();

你也可以通过TAG删除片段