Java RecyclerView:未连接适配器：跳过布局

我正在尝试实现将数据从数据库获取到回收器视图，但运行窗口没有显示连接的适配器。我看过各种教程，但没有任何帮助。我是android编程新手。请帮助我学习并改正我的错误 代码如下：

public class RecycleviewAdapter extends RecyclerView.Adapter<RecycleviewAdapter.RecyclerViewHolder>{
    private Context mContext;
    private Cursor mCursor;

    public RecycleviewAdapter(Context context ,Cursor cursor){
        mContext= context;
        mCursor =cursor;
    }
    public class RecyclerViewHolder extends RecyclerView.ViewHolder{
        public TextView time_data1;
        public TextView activity_data;
        public TextView location_data;

        public RecyclerViewHolder(@NonNull View itemView) {
            super(itemView);

            location_data=itemView.findViewById(R.id.location_data);
            activity_data=itemView.findViewById(R.id.activity_data);
            time_data1=itemView.findViewById(R.id.time_data1);

        }

    }

    @NonNull
    @Override
    public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        View view=inflater.inflate(R.layout.recycle_item,parent,false);
        return new RecyclerViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerViewHolder holder, int position) {
        Package pkg = new Package();
        if(!mCursor.move(position)){
            return;
        }
        String time=mCursor.getString(1);
        String name=mCursor.getString(2);
        holder.location_data.setText(name);
        holder.time_data1.setText(time);
        if(pkg.getDst().equals(mCursor.getString(2))){
            holder.activity_data.setText("Delivered");
        }
        else {
            holder.activity_data.setText("In Transit");
        }

    }


    @Override
    public int getItemCount() {
        return mCursor.getCount() ;


    }

    public  void swapCursor(Cursor newCursor){
        if(mCursor!=null){
            mCursor.close();
        }
        mCursor=newCursor;
        if(newCursor!=null){
            notifyDataSetChanged();
        }
    }
}

回收器xml：

<androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycleview"
            android:layout_width="408dp"
            android:layout_height="453dp"
            android:layout_alignParentStart="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentBottom="true"
            android:layout_marginStart="3dp"
            android:layout_marginLeft="3dp"
            android:layout_marginBottom="0dp" />

recycle_item.xml

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

<androidx.constraintlayout.widget.ConstraintLayout 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">

<RelativeLayout
    android:id="@+id/relativeLayout1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="#ffffff"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="1.0">

    <TextView
        android:id="@+id/location"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="11dp"
        android:text="Location" />

    <TextView
        android:id="@+id/location_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="71dp"
        android:layout_marginLeft="71dp"
        android:layout_marginTop="11dp"
        android:text="TextView" />

    <TextView
        android:id="@+id/activity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="30dp"
        android:text="Activity" />

    <TextView
        android:id="@+id/activity_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="71dp"
        android:layout_marginLeft="71dp"
        android:layout_marginTop="30dp"
        android:text="TextView" />

    <TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="50dp"
        android:text="Date/Time" />

    <TextView
        android:id="@+id/time_data1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="71dp"
        android:layout_marginLeft="71dp"
        android:layout_marginTop="50dp"

         />

</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

---

您已经创建了适配器，但没有将其连接到RecyclerView

mAdapter= new RecycleviewAdapter(MySuperApplication.getContext(),cursor1);

---

添加这一行：

recyclerView.setAdapter（yourAdapter）
您正在初始化
RecyclerView
并在循环中设置
适配器

while (cursor1.moveToNext()){
    RecyclerView recyclerView= findViewById(R.id.recycleview);

    recyclerView.setLayoutManager(new LinearLayoutManager(MySuperApplication.getContext()));
    mAdapter= new RecycleviewAdapter(MySuperApplication.getContext(),cursor1);
    //  Toast.makeText(getApplicationContext(),"data2"+cursor1.getString(cursor1.getColumnIndex(String.valueOf(1))),Toast.LENGTH_LONG).show();

}

像这样只做一次

Cursor cursor1 =databse.rawQuery("select * from track_info where track_id1 = ? order by name desc ",new String[]{pkg.getId()});
recyclerView.setLayoutManager(new LinearLayoutManager(MySuperApplication.getContext()));

mAdapter= new RecycleviewAdapter(MySuperApplication.getContext(),cursor1);
recyclerView.setAdapter(mAdapter);

你忘记设置适配器了

在这一行之后：

mAdapter=new RecycleviewAdapter（MySuperApplication.getContext（），cursor1）；

加：

recyclerView.setAdapter（mAdapter）

并将其移出while循环。
您需要调用：
recyclerView.setAdapter（您的适配器）在你实例化了你的Adapter后，我尝试了，但没有为它工作me@KaushikBurkuleafter你能指哪条线out@Traendy感谢您的回复从while循环中删除您的recyclerview初始化。在while循环中，在填充数组列表后在Arraylist中添加数据，然后设置adapter.mAdapter=new RecycleviewAdapter（MySuperApplication.getContext（），cursor1）；recyclerView.setAdapter（mAdapter）；我做了这些更改，但没有帮助。您没有调用
swapCursor
为适配器设置数据。所以适配器没有数据显示。我是android编程新手，你能帮我怎么做吗
Cursor cursor1 =databse.rawQuery("select * from track_info where track_id1 = ? order by name desc ",new String[]{pkg.getId()});
recyclerView.setLayoutManager(new LinearLayoutManager(MySuperApplication.getContext()));

mAdapter= new RecycleviewAdapter(MySuperApplication.getContext(),cursor1);
recyclerView.setAdapter(mAdapter);