我有一个RideHistoryFragment，其ArrayList也有三个子列表。
我的父片段代码如下：
public class RideHistoryFragment extends Fragment implements
ApplicationConstants {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
SharedPreferences myPrefs;
public ArrayList<RideHistoryResposeBeans> arrayList;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_ride_history,
container, false);
viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
arrayList = new ArrayList<RideHistoryResposeBeans>();
myPrefs = getActivity().getSharedPreferences("login",
getActivity().MODE_PRIVATE);
RideHistoryRequest params = new RideHistoryRequest();
params.setUserId(myPrefs.getString(REG_ID, ""));
RideHistoryAsyn asyn = new RideHistoryAsyn();
asyn.execute(params);
// Inflate the layout for this fragment
return rootView;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getFragmentManager());
adapter.addFragment(new AllRides(arrayList), "ALL RIDES");
adapter.addFragment(new UpComing(arrayList), "UPCOMING");
adapter.addFragment(new Completed(arrayList), "COMPLETED");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<Fragment>();
private final List<String> mFragmentTitleList = new ArrayList<String>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
public class RideHistoryAsyn extends AsyncTask<Object, Void, Object>
implements OnCancelListener {
// private static final Logger LOGGER =
// Logger.getLogger(HTTPAsyncServiceTask.class);
private String progressMsg = "Please wait..";
private ProgressHUD mProgressHUD;
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressHUD = ProgressHUD.show(getActivity(), progressMsg, true,
false, this);
// activity.displayManager.showProgressBar(activity, progressMsg);
}
@Override
protected Object doInBackground(Object... params) {
Object responseObject = null;
try {
RideHistoryRequest object = (RideHistoryRequest) params[0];
HashMap<String, String> postDataParams = new HashMap<String, String>();
JSONObject Detail = new JSONObject();
try {
Detail.put(USERID, object.getUserId());
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String url=BASE_URL + RIDE_HISTORY+USERID+"="+myPrefs.getString(REG_ID, "");
HttpConnectionManager httpConnManager = new HttpConnectionManager();
responseObject = httpConnManager.performGETCall(
url,
postDataParams);
Log.d("url", url);
} catch (Exception e) {
// LOGGER.error("Error occured inside doInBackground ", e);
}
return responseObject;
}
@Override
protected void onPostExecute(Object result) {
super.onPostExecute(result);
mProgressHUD.dismiss();
String string=(String) result;
try {
JSONObject jsonObject = new JSONObject(string);
JSONArray responseArray = jsonObject.getJSONArray("response");
JSONArray historyeArray = jsonObject.getJSONArray("history");
JSONObject object = responseArray.getJSONObject(0);
Geocoder geocoder = new Geocoder(getContext());
String message = object.optString("Message");
if (message.equals("Record found")) {
arrayList.clear();
for (int i = 0; i < historyeArray.length(); i++) {
JSONObject jsonObject2 = historyeArray.getJSONObject(i);
RideHistoryResposeBeans beans = new RideHistoryResposeBeans();
beans.setBookingStatus(jsonObject2
.optString("BookingStatus"));
beans.setCabName(jsonObject2.optString("CabName"));
beans.setCabType(jsonObject2.optString("CabType"));
beans.setUserId(jsonObject2.optString("UserId"));
beans.setUserLat(jsonObject2.optString("UserLat"));
beans.setUserLong(jsonObject2.optString("UserLong"));
List<Address> addresses = null;
String addressText = "";
try {
addresses = geocoder.getFromLocation(Double
.parseDouble(jsonObject2
.optString("UserLat")), Double
.parseDouble(jsonObject2
.optString("UserLong")), 1);
} catch (IOException e) {
e.printStackTrace();
}
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
addressText = String
.format("%s, %s, %s",
address.getMaxAddressLineIndex() > 0 ? address
.getAddressLine(0) : "",
address.getLocality(), address
.getCountryName());
}
beans.setFromAddress(addressText);
arrayList.add(beans);
}
}
} catch (Exception e) {
}
setupViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
}
@Override
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
}
}
}
我有三个孩子，现在我想在其子片段中使用ArrayList。
我在子片段中使用下面的代码，但AllRides（子片段）中的ArrayList给出了空点异常。
public class AllRides extends Fragment{
ArrayList< RideHistoryResposeBeans> arrayList;
RideRecyclerAdapter adapter;
private RecyclerView mRecyclerView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.all_ride,
container, false);
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.rv);
arrayList=new ArrayList<RideHistoryResposeBeans>();
// arrayList=((RideHistoryFragment)getParentFragment()).arrayList;
adapter=new RideRecyclerAdapter(getContext(),arrayList );
// Inflate the layout for this fragment
Log.d("size", arrayList.size()+"");
mRecyclerView.setAdapter(adapter);
return rootView;
}
public AllRides(ArrayList< RideHistoryResposeBeans> arrayList) {
// TODO Auto-generated constructor stub
this.arrayList=arrayList;
}
...谢谢