将自定义 ArrayAdapter 保存在 Fragment 中的 savedInstanceState 中

Question

我一直在使用 Evernote API 的应用程序工作，它已经在工作，但现在我在不同的活动中包含 savedInstanceStates。他们都在工作至少一个。例如，当我在列表中显示 Evernote 中的笔记并且旋转屏幕时，列表视图将再次创建。我想保存它的实例。

我已经尝试使用 setRetainInstance(true) 但是当屏幕旋转时，Listview 就像冻结一样，我无法在其中切换或滚动它。我正在阅读其他 post，这是因为我添加了与 MainActivity 中调用的 set.OnClickListener 的交互，而在此 Fragment 中没有。

所以，我正在寻找一种方法来存储数组的 savedInstance，以便在我旋转屏幕或 inResume() 等时调用它。

这是我的代码（因为MainActivity太长所以我只是添加了相关的方法）：

public class MainActivity extends AppCompatActivity implements  NoteListFragment.OnFragmentInteractionListener,EvernoteLoginFragment.ResultCallback  {    
private EvernoteSession mEvernoteSession;    
private static final EvernoteSession.EvernoteService EVERNOTE_SERVICE = EvernoteSession.EvernoteService.SANDBOX;   
private NoteFilter filter = new NoteFilter();    
private EvernoteNoteStoreClient noteStoreClient;   
private static NoteListFragment noteFragment;    
private DrawerLayout mDrawerLayout;
private int mSelectedNavItem;
private static final String KEY_SELECTED_NAV_ITEM = "KEY_SELECTED_NAV_ITEM";

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

    noteFragment = (NoteListFragment) getFragmentManager().findFragmentById(R.id.note_list);

    if (noteFragment == null) {
        noteFragment = new NoteListFragment();
        getFragmentManager()
                .beginTransaction()
                .add(R.id.main_content, noteFragment)
                .commit();
    }

    if (savedInstanceState != null) {
        mSelectedNavItem = savedInstanceState.getInt(KEY_SELECTED_NAV_ITEM, mSelectedNavItem);
    } else {
        mSelectedNavItem = R.id.nav_item_update;
    }

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

    if (!isTaskRoot()) {

        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
    ActionBarDrawerToggle drawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.open_drawer, R.string.close_drawer);

    mDrawerLayout.setDrawerListener(drawerToggle);
    drawerToggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.navigationView);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {
            menuItem.setChecked(true);
            onNavDrawerItemClick(menuItem.getItemId());
            return true;
        }
    });
    navigationView.getMenu().findItem(mSelectedNavItem).setChecked(true);

    loginEvernote();

    if (!mEvernoteSession.isLoggedIn()) {
        mEvernoteSession.authenticate(this);
        // finish();
        return;
    } else {
       //this is comment because when it will be save correctly I don't need to call all times loadNotes
       // if (savedInstanceState == null) {
            loadNotes(filter);
       // }

    }

}  protected void loadNotes(NoteFilter filter) {


    noteStoreClient = mEvernoteSession.getEvernoteClientFactory().getNoteStoreClient();

    noteStoreClient.findNotesAsync(filter, 0, 100, new EvernoteCallback<NoteList>() {


        @Override
        public void onSuccess(NoteList result) {

            noteFragment.setNotes(result.getNotes());

            Toast.makeText(getApplicationContext(), R.string.onSucessLoadToast, Toast.LENGTH_LONG).show();
            Log.d(getClass().getSimpleName(), "notes: " + result);
        }

        @Override

        public void onException(Exception exception) {
            Log.e(getClass().getSimpleName(), "Error al recuperar las notas", exception);
        }
    });
}

现在是片段：

public class NoteListFragment extends Fragment implements AdapterView.OnItemClickListener {

private OnFragmentInteractionListener mListener;
private ListAdapter mAdapter;
private AbsListView mListView;
private List<Note> Notes;
private EvernoteSession mEvernoteSession;
private ArrayAdapter<NoteWrapped> adapter;
FloatingActionButton newNoteButton;

public NoteListFragment() {
}

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mAdapter = new ArrayAdapter<NoteWrapped>(getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1);
    //setRetainInstance(true);

}

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_note_list, container, false);


    mListView = (AbsListView) view.findViewById(android.R.id.list);
    ((AdapterView<ListAdapter>) mListView).setAdapter(mAdapter);
    mListView.setOnItemClickListener(this);
    newNoteButton = (FloatingActionButton) view.findViewById(R.id.fab);
    newNoteButton.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v) {
            FragmentManager frmg = getFragmentManager();
            frmg.beginTransaction()
                    .replace(R.id.main_content, new CreateNoteFragment())
                    .addToBackStack(null)
                    .commit();
        }
    });

    return view;
}


@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    if (null != mListener) {


        try {
            mListener.onFragmentInteraction(Notes.get(position));
        } catch (EDAMUserException e) {
            e.printStackTrace();
        } catch (EDAMSystemException e) {
            e.printStackTrace();
        } catch (EDAMNotFoundException e) {
            e.printStackTrace();
        } catch (TException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }

}


@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mListener = (OnFragmentInteractionListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()
                + " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

public interface OnFragmentInteractionListener {
    void onResume(Bundle savedInstanceState);
    public void onFragmentInteraction(Note note) throws EDAMUserException, EDAMSystemException, EDAMNotFoundException, TException, ExecutionException, InterruptedException;
}

public class NoteWrapped{

    private final String title;

    public NoteWrapped(Note note) {
        this.title = note.getTitle();
    }

    @Override
    public String toString() {
        return title;
    }
}

public void setNotes(List<Note> notes) {
    this.Notes = notes;

    adapter = (ArrayAdapter<NoteWrapped>) mAdapter;

    adapter.clear();

    for (Note note : notes) {
        adapter.add(new NoteWrapped(note));
    }
}
}

以防万一，.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="false">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include
        android:id="@+id/toolbar"
        layout="@layout/toolbar" />

    <FrameLayout
        android:id="@+id/main_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


    </FrameLayout>

</LinearLayout>

<android.support.design.widget.NavigationView
    android:id="@+id/navigationView"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:background="#E8F5E9"
    android:fitsSystemWindows="false"
    app:itemTextColor="@android:color/secondary_text_light"
    app:menu="@menu/settings_header">

</android.support.design.widget.NavigationView>

</android.support.v4.widget.DrawerLayout>

Answer 1

已经修复。我在其他 post 中找到了答案，我只是改编以在 Fragment 中使用它。

Something like this:

@Override
public Object onRetainNonConfigurationInstance() {
    return this.m_adapter.getItems();
}
And then in your onCreate():

@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);

    // more init stuff here

    sResultsArr = (ArrayList<SearchItems>)getLastNonConfigurationInstance();
    if(sResultArr == null) {
        sResultsArray = new ArrayList<SearchItems>();  // or some other initialization
    }

    self.m_adapter = new ResultsAdapter(home.this, R.layout.listrow, sResultsArr,home.this);

    // ...
}

将自定义 ArrayAdapter 保存在 Fragment 中的 savedInstanceState 中

Save Custom ArrayAdapter in savedInstanceState in Fragment

android

fragment

evernote

android-arrayadapter

android-listview