Java 如何使Android RecyclerView加载更多，无休止地滚动进度条（半可见）？_Java_Android_Google Cloud Firestore_Android Recyclerview

Java 如何使Android RecyclerView加载更多，无休止地滚动进度条（半可见）？

java android google-cloud-firestore

Java 如何使Android RecyclerView加载更多，无休止地滚动进度条（半可见）？,java,android,google-cloud-firestore,android-recyclerview,Java,Android,Google Cloud Firestore,Android Recyclerview,我使用带有循环视图的进度条进行了无休止的滚动，还使用fire store进行数据检索。我的问题是，进度条不在适当的位置/在屏幕上不可见（半可见）。我在下面粘贴了我的代码：活动\u main.xml 这是活动主XML文件 <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="

我使用带有循环视图的进度条进行了无休止的滚动，还使用fire store进行数据检索。我的问题是，进度条不在适当的位置/在屏幕上不可见（半可见）。我在下面粘贴了我的代码：

活动\u main.xml

这是活动主XML文件

<?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"
    tools:context=".MainActivity">


    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ProgressBar
        android:id="@+id/isLoading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ProgressBar
        android:id="@+id/isLoadingMore"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/recyclerView" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        android:clickable="true"
        android:contentDescription="@string/todo"
        android:focusable="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@android:drawable/ic_input_add" />

</androidx.constraintlayout.widget.ConstraintLayout>

注意showsdapter.java

这是适配器文件

package com.IUDV.Adapters;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.IUDV.R;
import com.IUDV.models.NoteShow;

import java.util.List;

public class NotesShowsAdapter extends RecyclerView.Adapter<NotesShowsAdapter.ViewHolder> {
    private List<NoteShow> noteShowList;

    public NotesShowsAdapter(List<NoteShow> noteShowList) {
        this.noteShowList = noteShowList;
    }

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

    @Override
    public void onBindViewHolder(@NonNull NotesShowsAdapter.ViewHolder holder, int position) {
        holder.txtTitle.setText(noteShowList.get(position).getTitle());
        holder.txtDesc.setText(noteShowList.get(position).getDescription());

    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView txtTitle;
        private TextView txtDesc;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            txtTitle = itemView.findViewById(R.id.textTitle);
            txtDesc = itemView.findViewById(R.id.textDesc);
        }
    }
}

包com.IUDV.Adapters；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.TextView；
导入androidx.annotation.NonNull；
导入androidx.recyclerview.widget.recyclerview；
进口com.IUDV.R；
导入com.IUDV.models.NoteShow；
导入java.util.List；
公共类NotesShowsAdapter扩展了RecyclerView.Adapter{
私人列表noteShowList；
公共注释ShowsAdapter（列表注释ShowList）{
this.noteShowList=noteShowList；
}
@非空
@凌驾
public NotesShowsAdapter.ViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int-viewType）{
View-View=LayoutFlater.from（parent.getContext（））.flate（R.layout.View\u layout，parent，false）；
返回新的NotesShowsAdapter.ViewHolder（视图）；
}
@凌驾
public void onBindViewHolder（@NonNull NotesShowsAdapter.ViewHolder，int位置）{
holder.txtitle.setText（noteShowList.get（position.getTitle（））；
holder.txtDesc.setText（noteShowList.get（position.getDescription（））；
}
@凌驾
public int getItemCount（）{
return noteShowList.size（）；
}
公共类ViewHolder扩展了RecyclerView.ViewHolder{
私有文本视图txtTitle；
私有文本视图txtDesc；
公共视图持有者（@NonNull View itemView）{
超级（项目视图）；
txtTitle=itemView.findViewById（R.id.textTitle）；
txtDesc=itemView.findviewbyd（R.id.textDesc）；
}
}
}

查看布局.xml

这是项目布局文件

<?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"
    android:layout_width="match_parent"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:background="@drawable/background_note"
    android:layout_height="wrap_content">


    <TextView
        android:id="@+id/textTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Title"
        android:textSize="16sp"
        android:textColor="@color/black"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textDesc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Description"
        android:textSize="14sp"
        android:textStyle="bold"
        android:textColor="@color/black"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textTitle" />

</androidx.constraintlayout.widget.ConstraintLayout>

你所说的“进度条不在适当的位置/可见（半可见）”是什么意思？它意味着进度条在屏幕上可见一半，就像进度条的位置在屏幕下方移动了一点，所以很可能是UI问题，而不是Firebase问题，对吗？你知道怎么解决这个问题吗，如用户界面问题和查询将完美工作。

package com.IUDV.Adapters;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.IUDV.R;
import com.IUDV.models.NoteShow;

import java.util.List;

public class NotesShowsAdapter extends RecyclerView.Adapter<NotesShowsAdapter.ViewHolder> {
    private List<NoteShow> noteShowList;

    public NotesShowsAdapter(List<NoteShow> noteShowList) {
        this.noteShowList = noteShowList;
    }

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

    @Override
    public void onBindViewHolder(@NonNull NotesShowsAdapter.ViewHolder holder, int position) {
        holder.txtTitle.setText(noteShowList.get(position).getTitle());
        holder.txtDesc.setText(noteShowList.get(position).getDescription());

    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView txtTitle;
        private TextView txtDesc;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            txtTitle = itemView.findViewById(R.id.textTitle);
            txtDesc = itemView.findViewById(R.id.textDesc);
        }
    }
}

<?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"
    android:layout_width="match_parent"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:background="@drawable/background_note"
    android:layout_height="wrap_content">


    <TextView
        android:id="@+id/textTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Title"
        android:textSize="16sp"
        android:textColor="@color/black"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textDesc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Description"
        android:textSize="14sp"
        android:textStyle="bold"
        android:textColor="@color/black"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textTitle" />

</androidx.constraintlayout.widget.ConstraintLayout>