使用recyclerview显示数据

时间：2019-03-29 15:06:27

标签： android-recyclerview display empty-list

我想在Recyclerview中显示Mysql数据库中的数据，但我已经使用了以下代码，但白页显示了没有任何内容，没有附加适配器的错误，跳过了布局，请有人帮助我

当我检查数据的json格式以在浏览器上显示时，它运作良好并且可以看到一些数据，我还更改了recyclerview的高度以匹配父级，但没有任何改变

这是我的活动代码


    private static final String URL_PRODUCTS =  BASE_URL + "2nksacco/task/DisplayTicket.php";

    List<DateAdapter>itemList;
    RecyclerView recyclerView;

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

        //getting the recyclerview from xml
        recyclerView = findViewById(R.id.recyclerView1);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));


        //RecyclerViewAdapter DateAdapter  = new RecyclerViewAdapter(TicketHistory.this, itemList);
        //recyclerView.setAdapter(DateAdapter);
        //initializing the productlist
        itemList = new ArrayList<>();

        //this method will fetch and parse json
        //to display it in recyclerview
        loadProducts();
    }
    private void loadProducts() {


        StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_PRODUCTS,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            //converting the string to json array object
                            JSONArray array = new JSONArray(response);


                            for (int i = 0; i < array.length(); i++) {
                                //getting product object from json array
                                JSONObject product = array.getJSONObject(i);


                                itemList.add(new DateAdapter(
                                        product.getString("pname"),
                                        product.getString("depdate"),
                                        product.getString("route"),
                                        product.getString("seats"),
                                        product.getString("amount"),
                                        product.getString("email")

                                ));
                            }
                            recyclerview
                            RecyclerViewAdapter adapter   = new RecyclerViewAdapter(TicketHistory.this, itemList);
                            recyclerView.setAdapter( adapter);
                            adapter.notifyDataSetChanged();

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }
                });

        //adding our stringrequest to queue
        Volley.newRequestQueue(this).add(stringRequest);
    }
}

这是我的适配器代码

    private   String pname;
    private   String depdate;
    private   String route;
    private   String seats;
    private   String amount;
    private   String email;



    public DateAdapter( String pname, String depdate, String route, String seats, String amount,String email) {
        this.pname = pname;
        this.depdate = depdate;
        this.route = route;
        this.seats = seats;
        this.amount = amount;
        this.email = email;
    }




    public String getPname() {
        return pname;
    }



    public String getDepdate() {
        return depdate;
    }


    public String getRoute() {
        return route;
    }


    public String getSeats() {
        return seats;
    }


    public String getAmount() {
        return amount;
    }


    public String getEmail() {
        return email;
    }



}

这是我的recylervierview适配器代码

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.DateAdapterViewHolder> {

    private Context mCtx;

    //private SharedPreferences pref;

    private  List<DateAdapter> itemList;
    public   RecyclerViewAdapter(Context mCtx,List<DateAdapter>itemList){
        this.mCtx=mCtx;
        this.itemList=itemList;
    }
    @Override
    public DateAdapterViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mCtx);
        View view = inflater.inflate(R.layout.item_view, null);
        return new DateAdapterViewHolder(view);
    }

    @Override
    public void onBindViewHolder(DateAdapterViewHolder holder, int position) {
        DateAdapter product = itemList.get(position);




        holder.TextViewName.setText(product.getPname());
        holder.TextViewDate.setText(product.getDepdate());
        holder.TextViewRoute.setText(product.getRoute());
        holder.TextViewSeats.setText(product.getSeats());
        holder.TextViewEmail.setText(product.getEmail());
        holder.TextViewMoney.setText(String.valueOf(product.getAmount()));

    }
    @Override
    public int getItemCount() {
        return itemList.size();
    }
    class DateAdapterViewHolder extends RecyclerView.ViewHolder {

        TextView  TextViewName,  TextViewDate, TextViewRoute, TextViewSeats,TextViewMoney, TextViewEmail;


        public DateAdapterViewHolder(View itemView) {
            super(itemView);

            TextViewName =  itemView.findViewById(R.id.textViewName) ;
            TextViewDate =  itemView.findViewById(R.id.textViewDate) ;
            TextViewRoute =  itemView.findViewById(R.id.textViewRoute);
            TextViewSeats =  itemView.findViewById(R.id.textViewSeats);
            TextViewMoney =  itemView.findViewById(R.id.textViewMoney);
            TextViewEmail =  itemView.findViewById(R.id.textViewEmail);
        }
    }
}

这是我的xml代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_ticket_history"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    tools:context=".TicketHistory">


    <TextView
        android:id="@+id/tv_month"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:hint="Month and User"
        android:text="TextView"
        android:textAlignment="center"
        android:textStyle="bold"
        android:visibility="invisible" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView1"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/progressBar"
        android:layout_alignParentLeft="true"
        android:layout_marginTop="60dp"
        android:layout_alignParentStart="true" />

    <ProgressBar
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:id="@+id/progressBar"
        />
</RelativeLayout>

列出要显示的项目

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/cardview1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="7dp"
    android:padding="10dp"
    card_view:cardBackgroundColor="#009688"
    card_view:cardCornerRadius="6dp"
    card_view:cardElevation="6dp"
    card_view:contentPadding="7dp">

    <TableLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <TableRow>

            <TextView
                android:id="@+id/textView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Name : "
                android:textColor="#ffff"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/textViewName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Name Show Here"
                android:textColor="#ffff"
                android:textSize="20sp"
                tools:text="@string/Name" />
        </TableRow>

        <TableRow>

            <TextView
                android:id="@+id/textView3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Date : "
                android:textColor="#ffff"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/textViewDate"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Date Show Here"
                android:textColor="#ffff"
                android:textSize="20sp"
                tools:text="@string/Ddate" />
        </TableRow>
<TableRow>
        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="route: "
            android:textColor="#ffff"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/textViewEmail"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Route Travelled"

            android:textColor="#ffff"
            android:textSize="20sp"
            tools:text="@string/Route" />
    </TableRow>

        <TableRow>

            <TextView
                android:id="@+id/textView9"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Email: "
                android:textColor="#ffff"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/textViewRoute"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Route Show"

                android:textColor="#ffff"
                android:textSize="20sp"
                tools:text="Email used" />
        </TableRow>

        <TableRow>

            <TextView
                android:id="@+id/textView7"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Number of seats : "
                android:textColor="#ffff"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/textViewSeats"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Seats Show"
                android:textColor="#ffff"
                android:textSize="20sp"
                tools:text="@string/Seats" />
        </TableRow>
        <TableRow>

            <TextView
                android:id="@+id/textView8"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Amount Paid : "
                android:textColor="#ffff"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/textViewMoney"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Amount Show"
                android:textColor="#ffff"
                android:textSize="20sp"
                tools:text="Amount paid" />
        </TableRow>

    </TableLayout>


</android.support.v7.widget.CardView>

我希望能够查看屏幕上显示的项目

0 个答案:

没有答案
相关问题
最新问题