GridLayoutManagerを使用してrecyclerviewの状態を保存および復元する

Question

以下は私のコードでのものですが、これはスクロール位置の保存と復元ではありません。私はスクロール位置を保存し、ユーザーが電話を回すときにそれを復元しようとしています。 recyclerview onOrientationChangedを追加し、それにrecyclerview位置を設定を使用して

活動で

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mRecyclerView = (RecyclerView) findViewById(R.id.rv_main_activity); 
    mRecyclerView.setHasFixedSize(true); 
    if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) { 
     mRecyclerView.setLayoutManager(mGridLayoutManager = new GridLayoutManager(this, 3)); 
    } else { 
     mRecyclerView.setLayoutManager(mGridLayoutManager = new GridLayoutManager(this, 5)); 
    } 

    mMoviesAdapter = new MoviesAdapter(this, this); 
    mRecyclerView.setAdapter(mMoviesAdapter); 

    if (Build.VERSION.SDK_INT > 10) { 
     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
     StrictMode.setThreadPolicy(policy); 
    } 

    getSupportLoaderManager().initLoader(ID_MOVIE_LOADER, null, this); 
    MoviesSyncTask.syncMovies(this, "popular"); 

} 

@Override 
protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putParcelable(SCROLL_POSITION, mRecyclerView.getLayoutManager().onSaveInstanceState()); 
} 

@Override 
protected void onRestoreInstanceState(Bundle savedInstanceState) { 
    super.onRestoreInstanceState(savedInstanceState); 
    if (savedInstanceState != null) { 
     mListState = savedInstanceState.getParcelable(SCROLL_POSITION); 
     mRecyclerView.getLayoutManager().onRestoreInstanceState(mListState); 
    } 
} 

Answer 1

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