java - 回收器 View 未显示在 fragment 中

Question

我有三个 fragment : fragment 用户、 fragment 主页和 fragment 进度。

我正在尝试在 homefragment 中实现一个 recycler View ，它可以在 recycler View 中回收图像，但没有发生任何事情，logcat 中也没有显示错误，我不知道我做错了什么。

1.这是我的自定义适配器:

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

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

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder>{
@NonNull

private LayoutInflater inflator;
List<Information> data= Collections.emptyList();

public CustomAdapter(Context context, List<Information> data){
    inflator= LayoutInflater.from(context);
}
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view=inflator.inflate(R.layout.customlayout, parent,false);
    MyViewHolder holder=new MyViewHolder(view);
    return holder;
}

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {

    Information current=data.get(position);
    holder.icon.setImageResource(current.images);
    holder.title.setText(current.title);

}

@Override
public int getItemCount() {
    return 0;
}

class MyViewHolder extends RecyclerView.ViewHolder{

    ImageView icon;
    TextView title;
    public MyViewHolder(View itemView) {
        super(itemView);

        icon = (ImageView) itemView.findViewById(R.id.listicon);
        title = (TextView) itemView.findViewById(R.id.textView);
    }
}
}

这是我的 fragment

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class HomeFragment extends Fragment  {
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private CustomAdapter adapter;
int[] IMAGES = {R.drawable.abs,R.drawable.arms,R.drawable.back,R.drawable.chest,R.drawable.full,R.drawable.legs};
private RecyclerView recyclerView;


ArrayList<HashMap<String, String>> data;


private String mParam1;
private String mParam2;


public HomeFragment() {

  }
public static HomeFragment newInstance(String param1, String param2) {                   
HomeFragment fragment = new HomeFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
    }
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
    mParam1 = getArguments().getString(ARG_PARAM1);
    mParam2 = getArguments().getString(ARG_PARAM2);
}
    }
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                     Bundle savedInstanceState) {

View layout = inflater.inflate(R.layout.fragment_home, container, false);
 recyclerView =(RecyclerView) layout.findViewById(R.id.drawerList);
 adapter = new CustomAdapter(getActivity(), getData());
 recyclerView.setAdapter(adapter);
 recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return layout;
  }

public static List<Information> getData(){
List<Information> data = new ArrayList<>();
int [] icons = {R.drawable.abs,R.drawable.arms,R.drawable.back,R.drawable.chest,R.drawable.full,R.drawable.legs};
String[] titles={"Abs","Arms","Back","Chest","full","legs"};
for (int i=0; i<icons.length && i<titles.length;i++){

    Information current = new Information();
    current.images=icons[i];
    current.title=titles[i];
    data.add(current);
}
return data;

}





}

我看不出我做错了什么。

1. fragmenthome.xml

   <?xml version="1.0" encoding="utf-8"?>
   <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".HomeFragment">
   
   
   
   <android.support.v7.widget.RecyclerView
   android:id="@+id/drawerList"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:layout_alignParentStart="true"
   android:layout_alignParentTop="true"
   android:layout_alignParentLeft="true">
   
    </android.support.v7.widget.RecyclerView>
   
        </FrameLayout>
   

4.Custom_layout.xml

    <RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">


<ImageView
    android:id="@+id/listicon"
    android:layout_width="match_parent"
    android:layout_height="150dp"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    app:srcCompat="@mipmap/ic_launcher" />

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="62dp"
    android:text="TextView" />

Answer 1

您没有在适配器的构造函数中分配数据

this.data = data;

那么您的商品数量应该是

  data.size(); 

不应为 0。