问题
please any one explain RecyclerView in fragment using volley to get json data. Already i refered below link coding Google recyclerview in fragment
this is my first project in android, so i cannot understand that coding. Please any one help me.
My fragmnet Coding:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View drawer = inflater.inflate(R.layout.fragment_progress, container, false);
orderLists = new ArrayList<>();
getProgressData();
recyclerView = (RecyclerView) drawer.findViewById(R.id.progress);
adapter = new ProgressOrderListAdapter(orderLists, this);
adapter.clearAdaptor();
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return recyclerView;
}
private void getProgressData(){
String mobilecustomertoken = SharedPreferencesManager.readPreferenceString("MobileCustomerToken", "D/N");
JSONObject progressData = new JSONObject();
try{
progressData.put("mobilecustomertoken", mobilecustomertoken);
JsonObjectRequest progressObject = new JsonObjectRequest(1, Common.OrderDetails + "progress", progressData, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject progressResponse) {
Log.d("Responseprogress", progressResponse.toString());
try {
int status = progressResponse.getInt("status");
if(status == 1) {
progressOrderProgress(progressResponse);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
Log.d("Response", "PROGRESS ERROR");
}
});
progressObject.setShouldCache(false);
ServiceBellApp.getInstance().addToRequestQueue(progressObject);
}
catch (JSONException localJSONException){
localJSONException.printStackTrace();
return;
}
}
private void progressOrderProgress(JSONObject progressResponse) throws JSONException {
JSONArray result = progressResponse.getJSONArray("orderdata");
OrderList orderListModule = new OrderList();
for(int i=0; i<result.length(); i++){
JSONObject orderData = result.getJSONObject(i);
orderListModule.setPackage_name(orderData.getString("package_name"));
orderListModule.setOrderdate(orderData.getString("orderdate"));
orderListModule.setServicedate(orderData.getString("servicedate"));
orderListModule.setServicetime(orderData.getString("servicetime"));
orderListModule.setOrderid(orderData.getString("orderid"));
orderListModule.setOrdstatus(orderData.getString("ordstatus"));
orderListModule.setOrderamount(orderData.getInt("orderamount"));
}
orderLists.add(orderListModule);
}
My adapter code:
public class OrderListAdapter extends RecyclerView.Adapter<OrderListAdapter.ViewHolder> {
List<OrderList> List;
private FragmentPending mContext;
public OrderListAdapter(List<OrderList> List, FragmentPending context) {
this.mContext = context;
this.List = List;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.order_list_view, null);
ViewHolder holder = new ViewHolder(view);
// this is where the each item is inflated.
return holder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
OrderList orderListsPos = List.get(position);
// this is where the data for each item is assigned
holder.textViewPackageName.setText(orderListsPos.getPackage_name());
holder.textOrderdate.setText(orderListsPos.getOrderdate());
holder.textServicedate.setText(orderListsPos.getServicedate());
holder.textServicetime.setText(orderListsPos.getServicetime());
holder.textOrderid.setText(orderListsPos.getOrderid());
holder.textOrderamount.setText("Rs." + orderListsPos.getOrderamount());
holder.textStatus.setText(orderListsPos.getOrdstatus());
}
@Override
public int getItemCount() {
return List.size();
}
public void clearAdaptor() {
List.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewPackageName;
public TextView textServicedate;
public TextView textServicetime;
public TextView textOrderdate;
public TextView textOrderid;
public TextView textOrderamount;
public TextView textStatus;
public ViewHolder(View itemView) {
super(itemView);
textViewPackageName = (TextView) itemView.findViewById(R.id.productName);
textOrderdate = (TextView) itemView.findViewById(R.id.orderdate);
textOrderid = (TextView) itemView.findViewById(R.id.orderno);
textOrderamount = (TextView) itemView.findViewById(R.id.orderprice);
textStatus = (TextView) itemView.findViewById(R.id.orderstatus);
}
}}
回答1:
First you need four things
1 ) layout that holds the each recycler view layout item
2 ) A view holder for creating each layout
3 ) A Model Class to holds the data
4 ) Recycler Adaptor which deals with the data for the Each Layout item
FIrst create a layout item
for eample lets create a single view with only TextView in it
XML
each_item.xml
<TextView
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:gravity="start|center_vertical"
android:textColor="@color/white"
android:textSize="18sp" />
and lets now create a view holder i will post both code for the view holder and RecyclerAdaptor
public class Adaptor extends RecyclerView.Adapter<Adaptor.ViewHolder> {
List<Model> List = Collections.emptyList();
private Context mContext;
private LayoutInflater inflater;
public Adaptor(Context context, List<Model> List) {
inflater = LayoutInflater.from(context);
this.mContext = context;
this.List = List;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.each_item, parent, false);
final ViewHolder holder = new ViewHolder(view);
// this is where the each item is inflated.
return holder;
}
@Override
public void onBindViewHolder(WinnersViewHolder holder, int position) {
Model mModel = List.get(position);
// this is where the data for each item is assigned
holder.nameView.setText("" + mModel.getName());
}
@Override
public int getItemCount() {
return List.size();
}
public void clearAdaptor() {
List.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
protected TextView nameView;
public ViewHolder(View itemView) {
super(itemView);
this.nameView = (TextView) itemView.findViewById(R.id.name);
}
}
}
Now the model class
public class Model {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name= name;
}
}
Now the back end is done, Lets implement it on the Fragment
List<Model> List = new ArrayList<>();
private RecyclerView mRecyclerView;
private Adaptor adaptor;
public Fragment() {
// constructor of fragment
// Required empty public constructor
}
in the onCreatView() get the id of recyclerView
View fragmentView = inflater.inflate(R.layout.fragment_layout, container, false);
mRecyclerView = (RecyclerView) fragmentView .findViewById(R.id.recycler_view);
and then pass the data to the Adaptor by creating its object
adaptor = new Adaptor(getContext(), List);
adaptor.clearAdaptor();
mRecyclerView.setAdapter(adaptor);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
You are done now, only thing pending is if you are accessing data form server call notifyDataSetChanged() or adaptor = new Adaptor(getContext(), getList()); where the getList() returns the Model data and do not call adaptor.clearAdaptor() .
hope this helps ..
EDIT
you can two ways infalte the each layout item .. one is above and second is in onCreateViewHolder
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.each_item, null);
回答2:
Check this link It is really helpful for beginners for understanding concepts from start to mastering the RecyclerView.
https://github.com/codepath/android_guides/wiki/Using-the-RecyclerView
Hope this helps you to understand recycler view concepts.
来源：https://stackoverflow.com/questions/38157011/recyclerview-in-fragmnet-using-volley-json-data