Can't Restore Scroll Position After Rotation (recyclerview)

Can't restore the scroll posiotn of RecyclerView after rotation and after I close the app and open it again. In the first case I could use android:configChanges in Manifest, but it

Solution 1:

You need to follow this answer on stackoverflow.Change your code

publicclassMainActivityextendsAppCompatActivity { 


    privatefinalStringKEY_RECYCLER_STATE="recycler_state";

    private MainAdapter adapter;
    private LinearLayoutManager layoutManager;

    private ImageView ivRefresh;
    private ProgressBar progressBar;
    private RecyclerView rvUsers;
    privatestatic Bundle mBundleRecyclerViewState;

    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ivRefresh = (ImageView) findViewById(R.id.ivRefresh);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        rvUsers = (RecyclerView) findViewById(R.id.rvUsers);

        layoutManager = newLinearLayoutManager(this);
        rvUsers.setLayoutManager(layoutManager);


        adapter = newMainAdapter(newArrayList<>(), this);
        rvUsers.setAdapter(adapter);

        Toolbartoolbar= (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);




    } 


    @OverrideprotectedvoidonPause() 
    { 
        super.onPause(); 

        // save RecyclerView state 
        mBundleRecyclerViewState = newBundle();
        ParcelablelistState= rvUsers.getLayoutManager().onSaveInstanceState();
        mBundleRecyclerViewState.putParcelable(KEY_RECYCLER_STATE, listState);
    } 

      @OverrideprotectedvoidonResume() 
    { 
        super.onResume(); 

        // restore RecyclerView state if (mBundleRecyclerViewState != null) {
            ParcelablelistState= mBundleRecyclerViewState.getParcelable(KEY_RECYCLER_STATE);
            rvUsers.getLayoutManager().onRestoreInstanceState(listState);
        } 
    } 


} 

Solution 2:

You need to override the onRestoreInstanceState() and set recyclerView.getLayoutManager() with the saved bundle

Parcelable savedRecyclerLayoutState ;

  @OverridepublicvoidonRestoreInstanceState(@Nullable Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        if(savedInstanceState != null)
        {
            savedRecyclerLayoutState = savedInstanceState.getParcelable(BUNDLE_RECYCLER_LAYOUT);
            rvUsers.getLayoutManager().onRestoreInstanceState(savedRecyclerLayoutState);
        }
    }

Also you need to override onResume() in your activity

@OverrideprotectedvoidonResume() {
    super.onResume();

    if (savedRecyclerLayoutState != null) {
        layoutManager.onRestoreInstanceState(savedRecyclerLayoutState );
    }
}

Solution 3:

Initially you have to get the current scrolling position of the RecyclerView by calling:

intindex = rvUsers.getFirstVisiblePosition();

Then you have to save this value while orientation changes and when the RecyclerView is created again you have to move your RecyclerView to this index.

I suppose this could work:

rvUsers.smoothScrollToPosition(intindex)

---

if you're using older versions use

setSelection(int position)

and

getFirstVisiblePosition() 

methods

Solution 4:

It's important to set adapter with already filled data. In this case the position is restored automatically.