CODEWITHSUNDEEP
androidfragment
Tecksky Android
Tecksky Android

Reputation: 133

How to avoid fragment reload after onBackPressed Android

I used fragment to show Vehicle list in recycler view. Whenever user clicks on Vehicle then it shows its details in another fragment, but when i comeback on Vehicle list fragment after getting its details using back button pressed then Vehicle list fragment loads like first time. I used load more in recycler view. That's why whenever user scrolls much more and if he wanted to see details of the vehicle and then come back on list it reloads like first time and user gets first item back...

Recycler view scroll listener in Vehicle list Fragment

rvVehicleList.addOnScrollListener(new EndlessRecyclerViewScrollListener((LinearLayoutManager) rvVehicleList.getLayoutManager()) {
        @Override
        public void onLoadMore(int page, int totalItemsCount) {
            if (!vehicleSearchResponseModel.getData().get_links().getNext().equals("")) {
                pageNo++;
                searchMoreVehicle(pageNo);
            }
        }
    });

Recycler view's on Click from adapter for vehicle info Fragment

holder.llMainView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            FragmentManager fragmentManager = ((FragmentActivity) context).getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

            Bundle bundle = new Bundle();
            bundle.putSerializable("vehicleInfo", vehicleSearchPagerList.get(position));

            VehicleAdInfoFragment vehicleAdInfoFragment = new VehicleAdInfoFragment();
            vehicleAdInfoFragment.setArguments(bundle);
            fragmentTransaction.replace(R.id.frContainer, vehicleAdInfoFragment);
            fragmentTransaction.addToBackStack(vehicleAdInfoFragment.getTag());
            fragmentTransaction.commit();
        }
    });

Upvotes: 1

Views: 3823

Answers (3)

Suraj Vaishnav
Suraj Vaishnav

Reputation: 8305

To restrict the recreation of the fragment, what I did:

In onCreateView you can store inflated view in a global variable and initialize it only if it is null, like in this code:

    var root:View?=null
    var apiDataReceived=false
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    // Inflate the layout for this fragment
    if (root==null)
        root=inflater!!.inflate(R.layout.fragment_layout, container, false)
    return root
}

Now if you are parsing some data and fill it into RecyclerView or any other View

  1. Make a global variable like in the above code apiDataReceived

  2. Set it to true if you successfully parsed data.

  3. Before apiCalls place a condition like this:

    if (!apiDataReceived) { apiCalls() }

So if apiCalls() would be called only if data is not parsed.

Do your HTTP calls and parsing or any other thing in a method which called after onCreateView like onStart

The above code is in kotlin, If you are facing any issue, let me know in the comments.

Upvotes: 3

androiduser
androiduser

Reputation: 189

One solution could be where you do not need to replace fragment instead use add() method. This is the only thing that worked in my case to avoid reloading of previous fragment.

fun addFragment(fragment: Fragment) 
{
        val transaction = supportFragmentManager.beginTransaction()
        val currentFragment = supportFragmentManager .findFragmentById(R.id.container)  //get current fragment
        transaction.hide(currentFragment!!)          //hide current fragment
        transaction.add(R.id.container, fragment)    //add next fragment
        transaction.addToBackStack(null)
        transaction.commit()
    }

Upvotes: -1

Fitz
Fitz

Reputation: 101

You can try something like this in your vehicle list fragment:

@Override
public void onPause(){
    super.onPause();
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
    SharedPreferences.Editor editor = preferences.edit();
    mCurrentIndex = ((LinearLayoutManager) rvVehicleList.getLayoutManager()).findFirstVisibleItemPosition();
    editor.putInt("current_position", mCurrentIndex);
    editor.apply();
}

@Override
public void onResume(){
    super.onResume();
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
    mCurrentIndex = preferences.getInt("current_position", 0);
    rvVehicleList.getLayoutManager().scrollToPosition(mCurrentIndex);
}

Upvotes: 0

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