回收商视图未打印给定数据

时间：2015-11-20 01:06:41

标签： java android android-recyclerview

我试图将SlideNerd的说明纳入如何在我的CS项目中创建回收者视图。 他正在教导如何在导航抽屉内制作回收者视图，并且我试图在主要活动中制作一个。

这是我的 current output

显示了一个回收元素，但问题是它是XML代码中初始化的示例文本和图标.RelectItemRecyclerFragment中的数据未传递给ItemViewholder而不显示。有人能帮助我找到我做错的事吗？

更新 通过将测试语句放在getData（），onBindViewHolder（）和getItemCount（）方法中进行调试后，我了解到我的onBindViewHolder（）方法没有被调用。我已经查看了与我的问题相关的其他问题，他们的解决方案是实例化我已经做过的LinearLayoutManager。有人知道onBindViewHolder（）在哪里/怎么被调用或者我忘了做什么来调用它？

java文件

ChooseItem.Java：

import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class ChooseItem extends AppCompatActivity {

    private Toolbar toolbar;
    private ItemAdapter adapter;
    private RecyclerView recyclerView;


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

        ChooseItemRecyclerFragment fragment = (ChooseItemRecyclerFragment) getSupportFragmentManager().findFragmentById(R.id.choose_item_list_fragment);
        fragment.setUp(R.id.choose_item_list_fragment, (DrawerLayout) findViewById(R.id.drawer_layout), toolbar);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_choose_item, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

ChooseItemRecyclerFragment.java：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by michael on 11/17/2015.
 */
public class ChooseItemRecyclerFragment extends Fragment {

    private View containerView;
    private RecyclerView recyclerView;
    private ItemAdapter adapter;
    public ChooseItemRecyclerFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    public static List<Item> getData(){
        List<Item> data= new ArrayList<>();
        int[] iconId = {R.id.item_icon, R.id.item_icon, R.id.item_icon, R.id.item_icon, R.id.item_icon};
        String[] itemNames = {"Fajita", "Cahones", "Burger", "Bald Eagles", "Communism"};
        String[] itemPrice = {"$10.43", "$1.43", "$10.43", "$10.43", "$666.66"};
        for(int i = 0; i<iconId.length&&i<itemNames.length&&i<itemPrice.length;i++){
            Item current= new Item(itemNames[i], "description", itemPrice[i], iconId[i]);

            data.add(current);
        }
        return data;

    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View layout =inflater.inflate(R.layout.fragment_choose_item, container, false);
        recyclerView = (RecyclerView)layout.findViewById(R.id.choose_item_list);
        // use this setting to improve performance if you know that changes
        // in content do not change the layout size of the RecyclerView


        adapter=new ItemAdapter(getActivity(), getData());
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        return  layout;  }


    public void setUp(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) {
        containerView=getActivity().findViewById(fragmentId);

    }
}

ItemAdapter.java 

package com.example.michael.othershit;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.Collections;
import java.util.List;

/**
 * Created by michael on 11/9/2015.
 */
public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {
    private LayoutInflater inflater;
    List<Item> data = Collections.EMPTY_LIST;
    /**
     * Created by michael on 11/9/2015.
     */
    public ItemAdapter(Context context,List<Item> list){
        inflater= LayoutInflater.from(context);
        data=list;
    }
    /**
     * Created by michael on 11/9/2015.
     */
    @Override
    public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view =inflater.inflate(R.layout.item_recycler_view_row, parent, false);
        ItemViewHolder holder = new ItemViewHolder(view);
        return holder;
    }

    /**
     * Created by michael on 11/9/2015.
     */
    @Override
    public void onBindViewHolder(ItemViewHolder holder, int position) {
        TextView title = holder.title;
        TextView price = holder.price;
        ImageView icon = holder.icon;

        title.setText(data.get(position).getName());
        price.setText(data.get(position).getItemPrice());
        icon.setImageResource(data.get(position).getIconId());
    }

    /**
     * Created by michael on 11/9/2015.
     */
    @Override
    public int getItemCount() {
        return data.size();
    }
    /**
     * Created by michael on 11/9/2015.
     */
    class ItemViewHolder extends RecyclerView.ViewHolder{
        TextView title;
        TextView price;
        ImageView icon;
        public ItemViewHolder(View itemView) {
            super(itemView);
            title= (TextView) itemView.findViewById(R.id.item_name);
            icon = (ImageView) itemView.findViewById(R.id.item_icon);
            price=(TextView) itemView.findViewById(R.id.item_price);
        }
    }
}

XML文件：

activity_choose_items 

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.DrawerLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:fitsSystemWindows="true"
    tools:context=".ChooseItemActivity"
    android:id="@+id/drawer_layout">



    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
        <include layout="@layout/item_recycler_view_row"/>

        <include layout="@layout/content_choose_item" />
        <fragment android:id="@+id/choose_item_list_fragment"

            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:name="com.example.michael.othershit.ChooseItemRecyclerFragment"
            tools:layout="@layout/fragment_choose_item" />

    </LinearLayout>

</android.support.v4.widget.DrawerLayout>

fragment_choose_item：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:id="@+id/rv_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/choose_item_list">

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

</RelativeLayout>

item_recycler_view_row 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="48dp"
    android:id="@+id/item_recycler_view"
    >

    <ImageView android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/item_icon"
        android:layout_marginLeft="16dp"
       android:layout_marginRight="16dp"
        android:layout_gravity="center_vertical"
        android:src="@drawable/ic_local_restaurant">



    </ImageView>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:id="@+id/item_name"
       android:layout_marginLeft="72dp"
        android:text="Example Item Name"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:id="@+id/item_price"
        android:paddingLeft="32dp"
        android:text="$1.89"/>


</LinearLayout>

0 个答案:

没有答案
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