How Do I make my fragment go fullscreen with another fragment as it's parent not activity?

Question

Usually if fragment is contained within activity, we can just do this :

supportFragmentManager.beginTransaction()
     .add(android.R.id.content, OurFragment())
     .commit()

But what about from another fragment though ? they don't even have android.R.id.content And i know it is not impossible because DialogFragment exists. The question is how ? is there a way other than overriding dialogfragment ?

Answer 1

I've found out the answer

first you need to add android.permission.SYSTEM_ALERT_WINDOW on manifest.xml

then on your fragment

class YourFragment : Fragment(){

    lateinit var mTopView : View
    lateinit var windowManager: WindowManager

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val LAYOUT_FLAG: Int = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
        } else {
            WindowManager.LayoutParams.TYPE_PHONE
        }
        val params = WindowManager.LayoutParams(
            WindowManager.LayoutParams.MATCH_PARENT,
            WindowManager.LayoutParams.MATCH_PARENT,
            LAYOUT_FLAG,
            WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
            PixelFormat.TRANSLUCENT
        )

        windowManager = requireActivity().applicationContext
            .getSystemService(Context.WINDOW_SERVICE) as WindowManager

        val li = requireActivity().getSystemService(LAYOUT_INFLATER_SERVICE) as LayoutInflater
        mTopView = li.inflate(R.layout.yourlayout, null)

        windowManager.addView(mTopView, params)
        return mTopView
    }

    override fun onDestroyView() {
        super.onDestroyView()
        windowManager.removeView(mTopView)
    }

}