android - 未调用 RecyclerView header 的 OnClickListener

Question

我想在单击列标题时对我的 recyclerview 进行排序(例如，如果 Name 和 age 是 recyclerview 的两列，我想在单击标题 Age 时对列表进行排序)。我通过在包含 recyclerview 的 Activity 布局中包含标题布局来添加标题。

<RelativeLayout
    android:id="@+id/activity_main"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <include layout="@layout/header_item"/>

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipeContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:divider="@null"
            android:paddingBottom="@dimen/intrinsic_padding"
            android:paddingTop="50dp"/>

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

</RelativeLayout>

在具有上述布局的 Activity 类中，我为 recyclerview 设置了适配器并为 Textview Age 添加了 onClickListener。

public class MainActivity extends AppCompatActivity {
TextView ageTextview;

private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;

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

    ArrayList<User> usersList=initUsers();

    // Create RecyclerView List
    mRecyclerView=findViewById(R.id.my_recycler_view);

    mRecyclerView.setHasFixedSize(true);

    mLayoutManager=new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);

    mAdapter=new RecyclerAdapter(usersList, getApplicationContext());
    mRecyclerView.setAdapter(mAdapter);

    ageTextview=findViewById(R.id.ageHeader);

    ageTextview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, "Column -- Name", Toast.LENGTH_SHORT).show();

                Collections.sort(usersList, new Comparator<User>() {
                    @Override
                    public int compare(User user1, User user2) {
                        if (user1.getAge() < user2.getAge())
                        return -1;
                        else if (user1.getAge()==user2.getAge())
                            return 0;
                        else
                            return 1;
                    }
                });
                mAdapter.notifyDataSetChanged();
            }
        });
}
}

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

private ArrayList<User> users;

private Context context;

RecyclerAdapter(ArrayList<User> users, Context context)
{
    this.users=users;
    this.context=context;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.item_user, parent, false);
    return new VHItem(view);

}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof VHItem) {
        User user = users.get(position);

        ((VHItem)holder).userName.setText(user.getUserName());
        ((VHItem)holder).age.setText(String.valueOf(user.getAge()));
    }
}

@Override
public int getItemCount() {
    if (users !=null)
    {
        System.out.println("Number of users: "+ users.size());
        return users.size();
    }
    else {
        return 0;
    }
}

public static class VHItem extends RecyclerView.ViewHolder {
    public View view;
    TextView userName;
    TextView age;

    VHItem(View view)
    {
        super(view);
        this.view=view;
        this.userName=view.findViewById(R.id.username);
        this.age=view.findViewById(R.id.age);
    }
}

当我点击年龄标题时，没有任何效果。既不会发生排序，也不会显示 Toast。看起来根本没有调用 onClick() 方法。日志没有显示任何错误。 在布局文件 header_item 中，我尝试添加 android:clickable="true", android:focusable="false"。但没有任何效果。

如果我做错了什么，请帮助我理解。使用单独的布局文件添加 header 是否存在问题？

谢谢

Answer 1

尝试从 ViewHolder 获取 OnClickListner。像这样，

class ViewHolder extends RecyclerView.ViewHolder{

    public TextView ageTextview;

    public ViewHolder(View itemView) {

        super(itemView);

        ageTextview = temView.findViewById(R.id.ageTextview) ;

        ageTextview.setOnClickListener(..);

    }
}