Java 如何修复ListView中的NullPointerException？

我在使用自定义适配器创建ListView时遇到一个NullPointerException，但我不知道导致错误的代码部分。以下是代码片段：

ChatMessageAdapter.java

package com.myappcompany.rajan.thefictionalchat;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

public class ChatMessageAdapter extends ArrayAdapter<ChatText> {

    ChatMessageAdapter(Context context, ArrayList<ChatText> list) {
        super(context, 0, list);
    }

    @NonNull
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View currentView = convertView;
        if(currentView==null) {
            LayoutInflater.from(getContext()).inflate(R.layout.list_items, parent, false);
        }
        ChatText chatText = getItem(position);

        TextView textView;
        textView = (TextView)currentView.findViewById(R.id.chat_text);
        textView.setText(chatText.getMessage());

        if(chatText.getMessageType().equals("PERSON_1")) {
            textView.setGravity(Gravity.LEFT);
        }
        else if(chatText.getMessageType().equals("PERSON_2")) {
            textView.setGravity(Gravity.RIGHT);
        }
        else {
            textView.setGravity(Gravity.CENTER_HORIZONTAL);
        }

        return currentView;
    }
}

---

对视图进行充气，但不将充气视图保存到

currentView

更改此代码：

View currentView = convertView;
if(currentView==null) {
     LayoutInflater.from(getContext()).inflate(R.layout.list_items, parent, false);
}

为此：

View currentView = convertView;
if(currentView==null) {
    currentView = LayoutInflater.from(getContext()).inflate(R.layout.list_items, parent, false);
}

---

您需要从父视图所在的位置查找视图

View rootView = LayoutInflater.from(getContext()).inflate(R.layout.list_items, parent, false);
TextView textView ;
textView = rootView.findViewById(R.id.chat_text);

View currentView = convertView;
if(currentView==null) {
    currentView = LayoutInflater.from(getContext()).inflate(R.layout.list_items, parent, false);
}

View rootView = LayoutInflater.from(getContext()).inflate(R.layout.list_items, parent, false);
TextView textView ;
textView = rootView.findViewById(R.id.chat_text);