How to navigate to previous fragment without reloading in navigation component architecture

Question

I have Fragment A which loads some data when it opens. It has one button when we click. It navigate to Fragment B. That's not the issue, the problem is when I press back Button in Fragment B it comes to Fragment A and reload that data in Fragment A. My problem is I don't want to reload that data in Fragment A When back press From Fragment B.

Thanks in advance

have one flag in companion object and check its value before reloading. — sak
– sak, Commented Jun 18, 2021 at 16:12
It shouldn't reload the data? Are you replacing the fragment A with B and adding it to backstack? — sak
– sak, Commented Jun 18, 2021 at 16:24
<action android:id="@+id/action_homeFragment_to_showPurchaseFragment" app:destination="@id/showPurchaseFragment" app:enterAnim="@anim/fade_in_animation" app:exitAnim="@anim/fade_out_animation" app:popEnterAnim="@anim/fade_in_animation" app:popExitAnim="@anim/fade_out_animation" /> — R Suman Radhakrishnan
– R Suman Radhakrishnan, Commented Jun 18, 2021 at 16:31

Dharmender Manral · Accepted Answer · 2021-06-18 17:36:30Z

1

You should use viewModel and put your all data inside viewModel, In case of back press fragment will reload but your data will not refresh it will same as previous was on view.

Class TestViewModel:ViewModel(){

 init{
   apiReqest()
 }

fun apiReqest(){
 // writer here your api request code and observe it on view using observer
} 

}

answered Jun 18, 2021 at 17:36

Dharmender Manral

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Comments

sak · Accepted Answer · 2021-06-19 16:53:49Z

0

I would suggest Dharmender's approach but if you are not using viewmodel then you can try this:

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val tv1 = requireActivity().findViewById<TextView>(R.id.tv1)
        tv1.setOnClickListener {
            if(!isUpdated) {
                isUpdated = true
                requireActivity().supportFragmentManager.beginTransaction()
                    .replace((requireView().parent as ViewGroup).id, F2.newInstance())
                    .addToBackStack("f2").commit()
            }else{
                Toast.makeText(requireActivity(),"Already updated!", Toast.LENGTH_LONG).show()
            }
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        Log.e(TAG,"On create view")
        return inflater.inflate(R.layout.fragment_f1, container, false)
    }

    companion object {
        @JvmStatic
        fun newInstance() =
            F1()
        val TAG = F1::class.java.simpleName
        var isUpdated = false
    }

Here I am using one flag isUpdated.

answered Jun 19, 2021 at 16:53

sak

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1 Comment

R Suman Radhakrishnan Over a year ago

Thanks man, for this solution it works fine

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