回收器视图在向下滚动时崩溃(索引越界异常:索引:2，大小:2)

Question

i正在解析json中的数据并将其传递给包含两个Arraylist的ArrayList，然后将它们传递给RecyclerView，RecyclerView显示数据，但1个项目需要整个页面，当我向下滚动时，我可以看到第二个项目，然后它崩溃了

我尝试了很多PPL的建议，使父母或回收商的观点 layout_heigt="wrap_content"它甚至不会打开页面 下面是回收商视图 XML(activity_resultsdwldview( 和行.xml其中包含每一行的 CardView 设计

对不起，如果这没有组织或不清楚，我真的很短，而且是一个经验不多的初级安卓开发人员

activity_resultsdwldview.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="wrap_content"
tools:context=".Resultsdwldview">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyvlerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</RelativeLayout>

行.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="12dp"
android:layout_marginEnd="12dp"
android:layout_marginBottom="12dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/nameArray"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp" />
<TextView
android:id="@+id/URLName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp" />
</LinearLayout>
</android.support.v7.widget.CardView>

</LinearLayout>

适配器类

package com.example.imc;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {

List<ArrayList<String>> Tests;
ArrayList<String> urlArray;
ArrayList<String> nameArray;
public MainAdapter(List<ArrayList<String>> tests, ArrayList<String> urlArray, ArrayList<String> nameArray) {
Tests = tests;
this.urlArray = urlArray;
this.nameArray = nameArray;
}

@NonNull
@Override
public MainAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row,viewGroup,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MainAdapter.ViewHolder holder, int i) {
holder.URLName.setText( urlArray.get(i));
holder.mFullname.setText( nameArray.get(i));

}
@Override
public int getItemCount() {
return Tests.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView URLName;
public TextView mFullname;
public ViewHolder(@NonNull View itemView) {
super(itemView);
mFullname=itemView.findViewById(R.id.nameArray);
URLName=itemView.findViewById(R.id.URLName);
}
}
}

这是错误日志

E/RecyclerView: No adapter attached; skipping layout
D/EGL_emulation: eglMakeCurrent: 0xa2cede60: ver 2 0 (tinfo 0xa2cefaf0)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.imc, PID: 16616
java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
at java.util.ArrayList.get(ArrayList.java:411)
at com.example.imc.MainAdapter.onBindViewHolder(MainAdapter.java:40)
at com.example.imc.MainAdapter.onBindViewHolder(MainAdapter.java:13)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6781)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6823)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6019)
at android.support.v7.widget.GapWorker.prefetchPositionWithDeadline(GapWorker.java:286)
at android.support.v7.widget.GapWorker.flushTaskWithDeadline(GapWorker.java:343)
at android.support.v7.widget.GapWorker.flushTasksWithDeadline(GapWorker.java:359)
at android.support.v7.widget.GapWorker.prefetch(GapWorker.java:366)
at android.support.v7.widget.GapWorker.run(GapWorker.java:397)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

enter code here

Answer 1

适配器的大小由以下条件设置：

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

以及您尝试从以下位置获取物品：

@Override
public void onBindViewHolder(@NonNull MainAdapter.ViewHolder holder, int i) {
holder.URLName.setText( urlArray.get(i));
holder.mFullname.setText( nameArray.get(i));

}

您需要将适配器大小设置为您尝试检索的大小：

@Override
public int getItemCount() {
urlArray.size()
}

或

@Override
public int getItemCount() {
return nameArray.sizes()
}

我建议使用单个数组或可能的映射来避免类似的问题。