Question

所以我看到有关数据没有显示在recyclerview上的问题，但是我的工作与之无关。我使用PHP从Mysql获取数据，php获取日期和整数作为Json。但是当我打电话给recyclerview时，数据没有显示出来。 PHP脚本，我测试了脚本，它确实将数据作为Json

获取

recyclerView活动

public class recycle_view_sales_report extends AppCompatActivity {

private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private String string_url = "http://10.0.3.2/sales_report.php";
private salesAdapter adapter;
Context context = this;


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

    this.setTitle("Customer table");
    recyclerView = (RecyclerView)findViewById(R.id.recyclerv);
    layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setHasFixedSize(true);
    getinformation();
}

private void getinformation(){
    StringRequest stringRequest = new StringRequest(Request.Method.POST,string_url,
            new Response.Listener<String>(){

                @Override
                public void onResponse(String response) {

                    GsonBuilder builder = new GsonBuilder();
                    Gson gson = builder.create();


                    List<salesData> list = Arrays.asList(gson.fromJson(response,salesData[].class));
                    adapter = new salesAdapter(list,context);
                    recyclerView.setAdapter(adapter);


                }
            }, new Response.ErrorListener(){

        @Override
        public void onErrorResponse(VolleyError error) {

        }
    });

    MySingleton.getInstance(this).addToRequestQue(stringRequest);
}
}

适配器类

public class salesAdapter extends RecyclerView.Adapter<salesAdapter.MyViewholder> {



private List<salesData> list = new ArrayList<>();
Context context;


salesAdapter(List<salesData> list, Context ctx){
    this.list = list;
    context = ctx;
}


@Override
public salesAdapter.MyViewholder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.sales_report_layout,parent,false);
    return new salesAdapter.MyViewholder(view,context,list);
}

@Override
public void onBindViewHolder(salesAdapter.MyViewholder holder, int position) {

    holder.datetx.setText(String.valueOf(list.get(position).getDate()));
    holder.salestx.setText(String.valueOf(list.get(position).getSales()));


}

@Override
public int getItemCount() {
    return list.size();
}

public static class MyViewholder extends RecyclerView.ViewHolder {

    TextView datetx,salestx;
    List<salesData> datas = new ArrayList<salesData>();
    Context context;

    public MyViewholder(View itemView, Context ctx, List<salesData> datas){
        super(itemView);
        this.datas = datas;
        context = ctx;

        datetx = (TextView)itemView.findViewById(R.id.tx_date);
        salestx = (TextView)itemView.findViewById(R.id.tx_sales);





    }}
     }

数据类

  public class salesData {


 String date;
int sales;

public salesData(String date, int sales) {
    this.date = date;
    this.sales = sales;
}

public String getDate() {
    return date;
}

public void setDate(String date) {
    this.date = date;
}

public int getSales() {
    return sales;
}

public void setSales(int sales) {
    this.sales = sales;
}
}

XML RECYCLERVIEW

  `<?xml version="1.0" encoding="utf-8"?>
   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="120dp">


<TextView
    android:layout_width="wrap_content"
    android:layout_height="120dp"
    android:id = "@+id/tx_id"
    android:layout_alignParentLeft="true"
    android:text="Date:"
    android:gravity="center"
    android:textAppearance="?android:textAppearanceLarge"
    />

<TextView
android:id="@+id/tx_date"
android:layout_width="wrap_content"
android:layout_height="120dp"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/tx_id"
android:layout_toRightOf="@+id/tx_id"
android:gravity="center"
android:text="tx_date"
android:textAppearance="?android:textAppearanceLarge"/>

<TextView
    android:id="@+id/sales"
    android:layout_width="wrap_content"
    android:layout_height="120dp"
    android:layout_alignParentTop="true"
    android:layout_toEndOf="@+id/tx_date"
    android:layout_toRightOf="@+id/tx_date"
    android:gravity="center"
    android:text="Sales:"
    android:textAppearance="?android:textAppearanceLarge"/>

<TextView
    android:id="@+id/tx_sales"
    android:layout_width="wrap_content"
    android:layout_height="120dp"
    android:layout_alignParentTop="true"
    android:layout_toEndOf="@+id/sales"
    android:layout_toRightOf="@+id/sales"
    android:gravity="center"
    android:text="tx_sales"
    android:textAppearance="?android:textAppearanceLarge"/>

`

XML布局

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res    /android"
  android:layout_width="match_parent" android:layout_height="120dp">


<TextView
    android:layout_width="wrap_content"
    android:layout_height="120dp"
    android:id = "@+id/tx_id"
    android:layout_alignParentLeft="true"
    android:text="Date:"
    android:gravity="center"
    android:textAppearance="?android:textAppearanceLarge"
    />

<TextView
android:id="@+id/tx_date"
android:layout_width="wrap_content"
android:layout_height="120dp"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/tx_id"
android:layout_toRightOf="@+id/tx_id"
android:gravity="center"
android:text="tx_date"
android:textAppearance="?android:textAppearanceLarge"/>

<TextView
    android:id="@+id/sales"
    android:layout_width="wrap_content"
    android:layout_height="120dp"
    android:layout_alignParentTop="true"
    android:layout_toEndOf="@+id/tx_date"
    android:layout_toRightOf="@+id/tx_date"
    android:gravity="center"
    android:text="Sales:"
    android:textAppearance="?android:textAppearanceLarge"/>

 <TextView
    android:id="@+id/tx_sales"
    android:layout_width="wrap_content"
    android:layout_height="120dp"
    android:layout_alignParentTop="true"
    android:layout_toEndOf="@+id/sales"
    android:layout_toRightOf="@+id/sales"
    android:gravity="center"
    android:text="tx_sales"
    android:textAppearance="?android:textAppearanceLarge"/>

</RelativeLayout>

php脚本

    <?PHP


     require "conn.php";




   $sql_qry = " SELECT calendar.datefield AS DATE, SUM(orders.price) AS      total_sales FROM orders 
   RIGHT JOIN calendar ON (DATE(orders.date_time) = calendar.datefield) GROUP BY DATE;";

  $result = mysqli_query($conn, $sql_qry);

  $response = array();

  while($row = mysqli_fetch_array($result)){

  array_push($response,array("DATE"=>$row[0],"total_sales"=>$row[1]));



 }

 echo  json_encode($response);



  ?>

Answer 1

你可以尝试

我的Json看起来像

{“saleNodes”：[{“id”：“1”，“saledate”：“2017-10-10”}]}

我制作json的Php代码就像..

if ($result->num_rows > 0) {

$userDetails = array();
 while ($row = $result->fetch_assoc()) {

  //  $response["id"] = $row["id"];
   $userData[] = array(
      "id" => $row["id"],
      "saledate" => $row["date"],
    );

 }

  } else {
   echo "0 results";
 }

    $result1['saleNodes'] = $userData;
    $json = json_encode($result1);
   echo $json;

在android应用程序中可以获取数据

   private void getData() {
      String url="http://1.11.201.179/Airport/tour_places.php";


          StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                //pDialog.dismiss();


                try {
                    JSONObject jsonObject = new JSONObject(response);
                    JSONArray loginNodes = jsonObject.getJSONArray("saleNodes");

                    Log.e("****ddd",loginNodes.toString());
                    for (int i = 0; i < loginNodes.length(); i++) {
                        JSONObject jo = loginNodes.getJSONObject(i);
                        String name = jo.getString("saledate");

                        SalesData d = new SalesData();
                        d.setDate(name);
                        salesDatasList.add(d);

                    }
                    showCardList();


                } catch (JSONException e) {
                    e.printStackTrace();
                }


            }
        },
        new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                //pDialog.dismiss();
                Log.e("****ddd",error.toString());
            }
        }) {
    @Override
    protected Map<String, String> getParams() {
        Map<String, String> params = new HashMap<>();
      //Parmeter
        return params;
    }

};


    RequestQueue requestQueue = Volley.newRequestQueue(this);
     requestQueue.add(stringRequest);
  }

适配器看起来像

   //Being adapter
  void showCardList(){
    recyclerView.setHasFixedSize(true);


       recyclerView.setLayoutManager(new LinearLayoutManager(Your activity.this));


    // create an Object for Adapter
       mAdapter = new CardViewDataAdapter(salesDatasList);

     // set the adapter object to the Recyclerview
      recyclerView.setAdapter(mAdapter);
    }

       class CardViewDataAdapter extends RecyclerView.Adapter<CardViewDataAdapter.ViewHolder> {



             public CardViewDataAdapter(ArrayList<SalesData> os_versions) {

          dataSet = os_versions;
       }


  @Override
     public CardViewDataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
     // create a new view
       View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
            R.layout.row_sale, null);


    itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));
         CardViewDataAdapter.ViewHolder viewHolder = new CardViewDataAdapter.ViewHolder(itemLayoutView);

       return viewHolder;
    }

   @Override
     public void onBindViewHolder(CardViewDataAdapter.ViewHolder viewHolder, int i) {

         SalesData fp = dataSet.get(i);


        viewHolder.tv_date.setText(fp.getDate());




          viewHolder.menu = fp;
    }

    @Override
     public int getItemCount() {

      return dataSet.size();
     }

      public void updateList(List<SalesData> temp) {
          dataSet = (ArrayList<SalesData>) temp;
         notifyDataSetChanged();
       }

      // inner class to hold a reference to each item of RecyclerView
   public  class ViewHolder extends RecyclerView.ViewHolder {


       public TextView tv_date;



          public SalesData menu;

        public ViewHolder(View itemLayoutView) {
            super(itemLayoutView);
            tv_date = (TextView) itemLayoutView  .findViewById(R.id.tv_date);





           }

        }
      }
  //end Adapter

在Activity中声明变量

  ArrayList<SalesData> salesDatasList = new ArrayList<>();
  private CardViewDataAdapter mAdapter;
 private ArrayList<SalesData> dataSet;
 private RecyclerView recyclerView;

您的mainactity.xml

     <android.support.v7.widget.RecyclerView
           android:id="@+id/my_recycler_view"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_margin="10dp"
          android:scrollbars="vertical" />

row_sale.xml

  <?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"
android:layout_width="match_parent"
 android:layout_height="match_parent"
card_view:cardCornerRadius="5dp"
 card_view:cardBackgroundColor="#FFFFFF"
card_view:cardUseCompatPadding="true" >



<TextView
    android:id="@+id/tv_date"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:textSize="18sp"
    android:textStyle="bold"
    android:textAllCaps="true"
    android:text="date"/>

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

您的SaleDate类

public class SalesData {

 private String date;

public String getDate() {
 return date;

}

  public void setDate(String date) {
     this.date = date;
   }

}

不要忘记添加gadle.xml

compile 'com.android.support:cardview-v7:25.3.1'
compile 'com.android.support:recyclerview-v7:25.3.1'
compile 'com.mcxiaoke.volley:library:1.0.19'

上面的代码正在为我工作..很高兴...提前感谢..

Recyclerview MySql int显示0

1 个答案: