将包值显示到回收器视图

Question

public class AmountCartModel {

    private String testName;
    private String testPrice;

    public AmountCartModel() {
        this.testName = testName;
        this.testPrice = testPrice;
    }

    public String getTestName() {
        return testName;
    }

    public void setTestName(String testName) {
        this.testName = testName;
    }

    public String getTestPrice() {
        return testPrice;
    }

    public void setTestPrice(String testPrice) {
        this.testPrice = testPrice;
    }
}

这是我的活动

public class AmountCartActivity extends AppCompatActivity

    private RecyclerView recyclerView;
    List<AmountCartModel> mydataList ;
    private MyAdapter madapter;

    Bundle extras ;
    String testName="";
    String testPrice="";

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

        mydataList = new ArrayList<>();
        /*
        * Getting Values From BUNDLE
        * */
        extras = getIntent().getExtras();

        if (extras != null) {
            testName = extras.getString("test_name");
            testPrice = extras.getString("test_price");

            //Just add your data in list
            AmountCartModel mydata = new AmountCartModel();  // object of Model Class
            mydata.setTestName(testName );
            mydata.setTestPrice(testPrice);
            mydataList.add(mydata);
        }

       madapter=new MyAdapter(mydataList);
    madapter.setMyDataList(mydataList);
    recyclerView = (RecyclerView)findViewById(R.id.recyler_amount_cart);
    recyclerView.setHasFixedSize(true);
    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setAdapter(madapter);

    }

这是我的回收器适配器

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    private Context context;
    private List<AmountCartModel> myDataList;

    public MyAdapter(Context context) {
        this.context = context;
        myDataList = new ArrayList<>();
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        // Replace with your layout
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.amount_cart_row, parent, false);
        return new ViewHolder(view);
    }


    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // Set Your Data here to yout Layout Components..

        // to get Amount
        holder.testName.setText(myDataList.get(position).getTestName());
        holder.testPrice.setText(myDataList.get(position).getTestPrice());
    }

    @Override
    public int getItemCount() {

            return myDataList.size();

    }

    public void setMyDataList(List<AmountCartModel> myDataList) {
        // getting list from Fragment.
        this.myDataList = myDataList;
        notifyDataSetChanged();
    }


    public class ViewHolder extends RecyclerView.ViewHolder {

        TextView testName,testPrice;

        public ViewHolder(View itemView) {
            super(itemView);
            // itemView.findViewById

            testName=itemView.findViewById(R.id.test_name_one);
            testPrice=itemView.findViewById(R.id.price_name);

        }
    }
  }
}

logcat

这里，我从以前的活动回收器视图中获取值，并且我试图在此活动中通过Bundle显示它。
问题是，当我用这种方法执行操作时，活动没有显示任何东西，而我在我的Bundle中获取值，我没有获取它是什么问题。如有任何帮助，将不胜感激。谢谢你

Answer 1

显然你忘了设置适配器。更改代码

madapter=new MyAdapter(mydataList);
madapter.setMyDataList(mydataList);
recyclerView = (RecyclerView)findViewById(R.id.recyler_amount_cart);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);

至

madapter=new MyAdapter(mydataList);
madapter.setMyDataList(mydataList);
recyclerView = (RecyclerView)findViewById(R.id.recyler_amount_cart);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(madapter);

编辑2：将OnBindViewWholder更改为：

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    holder.testName.setText(myDataList.get(position).getTestName());
    holder.testPrice.setText(myDataList.get(position).getTestPrice());
}

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