Question

我有一个存储某些图像路径的ArrayList：

Map<String, Criterio> irregularidades = CriteriosAdapter.irregularidades;
for(Criterio c : irregularidades.values()) {
    ArrayList<String> listFotos = c.getFotosList();
}

但是，如果应用程序通过电话锁或某些电话进行后台操作。当我尝试保存数据时，我收到了空指针异常。

有人可以帮我吗？

修改

我将添加完整代码以便于理解。

public class SaveFragment extends Fragment {

Map<String, String> detailsLoja = LojaDetailsActivity.detailsVistoria;

/** Called when the activity is first created. */
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_sync_import, container, false);
    setHasOptionsMenu(true);
    saveData();

    return view;
}

@Override
public void onActivityCreated (Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);
}

public void saveData() {

    IrregularidadesDbAdapter mDb;
    mDb = new IrregularidadesDbAdapter(getContext());

    mDb.open();

    int idVistoria = mDb.vistoriaInsert(detailsLoja.get("idBombeiro"), detailsLoja.get("idLoja"), detailsLoja.get("idArea"), changeDate(detailsLoja.get("vistoriaData")));

    Map<String, Criterio> irregularidades = CriteriosAdapter.irregularidades;
    for(Criterio c : irregularidades.values()) {
        int idCriterio = c.getId();
        int idEquipamento = c.getEquipamento();
        int idArea = c.getSubArea;
        ArrayList<String> listFotos = c.getFotosList();

            int idIrregularidade = mDb.insert(idVistoria, idCriterio, idEquipamento, idArea);

            for (int i = 0; i < listFotos.size(); i++) {
                mDb.fotosInsert(idIrregularidade, listFotos.get(i));
            }
    }

    mDb.close();

    reloadActivity();

}

// Reload MainActivity
public void reloadActivity() {
    Intent objIntent = new Intent(getContext(), MainActivity.class);

    NavDrawerFragment.mConfiguration = Config.configuration();
    NavDrawerFragment.mConfiguration =  NavDrawerFragment.mConfiguration.subList(0, 6);
    NavDrawerFragment.mConfiguration.add(0, new NavItem("Header", NavItem.TOP));

    startActivity(objIntent);
}

}

Answer 1

当片段必须在屏幕上加载UI时，方法onCreateView仅被调用一次。因此，您需要在其他地方替换saveData();。

Android Lost ArrayList数据

1 个答案: