Question

我对Android很新，我开始使用RecyclerView进行练习，但出于某种原因我的数据没有显示。如果你能帮到那就太好了！ TY。这是一些代码。

主要活动：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    recyclerView = (RecyclerView) findViewById(R.id.myRecyclerView);
    adapter = new myAdapter(getApplicationContext(), getData());
    recyclerView.setAdapter(adapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
}

public static List<Information> getData() {
    List<Information> data = new ArrayList<>();
    String[] titles = { "TEST_TEXT1",
                        "TEST_TEXT1",
                        "TEST_TEXT1" };
    for (int i = 0; i < titles.length; i++) 
        Information current = new Information();
        current.title = titles[i];
        data.add(current);
    }

    return data;
}

myAdapter：

public class myAdapter extends RecyclerView.Adapter<myAdapter.myViewHolder> {

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

    public myAdapter(Context ctx, List<Information> data) {
        inflater = LayoutInflater.from(ctx);
    }

    @Override
    public myViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = inflater.inflate(R.layout.custom_row, viewGroup, false);
        myViewHolder holder = new myViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(myViewHolder viewHolder, int i) {
        Information current = data.get(i);
        viewHolder.user.setText(current.title);
    }

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

    class myViewHolder extends RecyclerView.ViewHolder {
        TextView user;
        public myViewHolder(View itemView) {
            super(itemView);
            user = (TextView) itemView.findViewById(R.id.rowUser);
        }
    }
}

自定义行XML：

<?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="match_parent">

    <TextView
        android:id="@+id/rowUser"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="TEST_TEXT"/>

</LinearLayout>

活动布局XML：

<RelativeLayout 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=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/myRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</RelativeLayout>

Answer 1

您不会将列表分配给任何内容。更改构造函数以分配成员变量，如下所示。

public myAdapter(Context ctx, List<Information> data) {
    inflater = LayoutInflater.from(ctx);
    this.data = data;
}

Answer 2

这是问题

 public myAdapter(Context ctx, List<Information> data) {
    inflater = LayoutInflater.from(ctx);
}

你忘记了data。

RecyclerView不显示我的数据

2 个答案: