Question

我试图按照MVP标准开发一个项目。在我遵循的指南中，作者创建了单独的ViewHolder类。我尝试做同样的事情，但是适配器拒绝使用单独的ViewHolder。

有2个错误

无法解析符号＆＃39; LessonCardView＆＃39;

＆＃39; onCreateViewHolder（ViewGroup，int）＆＃39;在RVAdapter中与＆＃39; onCreateViewHolder（ViewGroup，int）冲突＆＃39; in＆＃39; android.support.v7.widget.RecyclerView.Adapter＆＃39 ;;尝试使用不兼容的返回类型

RVAdapter.java

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.LessonCardViewHolder> {

    private String[] mDataset;

    public RVAdapter(String[] dataset) {
        mDataset = dataset;
    }

    @Override
    public LessonCardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new LessonCardViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.lessons_item_card, parent, false));
    }

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

    }

    @Override
    public int getItemCount() {
        return mDataset.length;
    }
}

LessonCardViewHolcer.java

public class LessonCardViewHolder extends RecyclerView.ViewHolder implements LessonCardView {

    private final TextView lessonCardText;

    public LessonCardViewHolder(View itemView) {
        super(itemView);
        lessonCardText = (TextView) itemView.findViewById(R.id.lesson_card_view);
    }

    @Override
    public void setLessonCardText(String text) {
        lessonCardText.setText(text);
    }
}

我创建了从RVAdapter中的LessonCardView继承的子类ViewHolder。错误消失了。但我不确定这是否正确。如果它适用于其他人，那么我做错了。

Answer 1

从此

更改适配器声明

ansible-playbook -e "runID=seq198837" provision.yml
ansible-playbook -e "runID=seq198837" build.yml
ansible-playbook -e "runID=seq198837" deploy.yml

到这个

Imports MySql.Data.MySqlClient

Public Class Login

    Dim connection As New MySqlConnection("connstringhere")

    ' show/hide password text 
    Private Sub CheckBoxSP_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBoxSP.CheckedChanged
        If PASSWORD.UseSystemPasswordChar = True Then
            ' show password
            PASSWORD.UseSystemPasswordChar = False
        Else
            ' hide password
            PASSWORD.UseSystemPasswordChar = True
        End If
    End Sub

    'button log in 
    Private Sub LOGINBUTTON_Click(sender As Object, e As EventArgs) Handles LOGINBUTTON.Click
        Dim command As New MySqlCommand("SELECT `Id`, `password` FROM `users` WHERE `Id` = @username AND `password` = @password", connection)
        command.Parameters.Add("@username", MySqlDbType.VarChar).Value = USERNAME.Text
        command.Parameters.Add("@password", MySqlDbType.VarChar).Value = PASSWORD.Text
        Dim adapter As New MySqlDataAdapter(command)
        Dim table As New DataTable()
        adapter.Fill(table)
        If table.Rows.Count = 0 Then
            MessageBox.Show("Invalid Username Or Password")
        Else
            MessageBox.Show("Logged In")
        End If
    End Sub

    Private Sub Login_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    End Sub

End Class

Answer 2

从您提供片段的方式来看，这些类在不同的文件中，或者没有正确嵌套在同一个文件中。

您是否尝试过使用AutoFilter()而不是Sub Mail_small_Text_Outlook() ... your code Dim xRg As Range Dim xEmailAddr As String Dim zEmailAddr As String Set xRg = Sheet1.Range("C5:C11") ' include headers for autofilter to work With xRg.Resize(, 3) 'include email addresses and recipient columns .Sort key1:=.Cells(1, 3), key2:=.Cells(1, 2), header:=xlYes 'sort on recipients and email addresses to make sure you'll have adjacent filtered cells xEmailAddr = GetEmailAddresses(.Cells, "MainR") 'get "Main Recipient" addresses zEmailAddr = GetEmailAddresses(.Cells, "cc") 'get "cc" addresses End With ... rest of your code End Sub Function GetEmailAddresses(rng As Range, recipient As String) As String With rng .AutoFilter Field:=2, Criteria1:="*@*" ' filter referenced cells on 1st column with "0" content .AutoFilter Field:=3, Criteria1:=recipient ' filter referenced cells on 2nd column with "4000" content Select Case Application.WorksheetFunction.Subtotal(103, .Columns(3)) Case 2 GetEmailAddresses = .Offset(1, 1).Resize(.Rows.Count - 1, 1).SpecialCells(xlCellTypeVisible).value Case Is > 2 GetEmailAddresses = Join(Application.Transpose(.Offset(1, 1).Resize(.Rows.Count - 1, 1).SpecialCells(xlCellTypeVisible).value), ";") End Select .Parent.AutoFilterMode = False End With End Function？

Answer 3

LessonCardViewHolder应该是RVAdapter中的嵌套类

Answer 4

这是完整的解决方案 - Recyclerview Adapter类示例

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


Context context;
ArrayList<Model> modelList;


public ImagesAdapter(Context context,ArrayList<Model> modelList) {
    this.context=context;
    this.modelList=modelList;
}

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

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
        Model model=photo.get(position);
        userViewHolder.textView.setText(model.getTitle());

}

public class ViewHolder extends RecyclerView.ViewHolder{

    TextView textView;
    public ViewHolderImages(View itemView) {
        super(itemView);
        textView=(TextView)itemView.findViewById(R.id.textView);
    }
}

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

}

RecyclerView适配器没有看到ViewHolder

4 个答案: