Question

我一直在使用Evernote API的应用程序中工作，它已经在工作，但是现在我在不同的活动中包含savedInstanceStates。所有人都至少工作一次。当我在List和I中显示Evernote的笔记时，例如，旋转屏幕，再次创建列表视图。我想保存它的实例。

我已经尝试过使用setRetainInstance（true），但是当屏幕旋转时，Listview就像冻结，我无法在其中标记或滚动它。我正在阅读其他帖子，因为我添加了与MainActivity中调用的set.OnClickListener的交互，而在此片段中没有。

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（我只是添加相关的方法导致MainActivity这么长）：

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 cause 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

已经修好了。我在其他post中找到了答案，我只是在Fragment中使用它。

这样的事情：

@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

1 个答案: