适配器内TextView上的空指针引用

Question

我创建了自己的自定义适配器以支持多种类型的using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LinearSearch { class Program { static void Main(string[] args) { int var1 = 50; int[] arr; arr = new int[10]{10,20,30,40,50,60,70,80,90,100}; int retval = linearsearch(arr,var1); if (retval >= 1) { Console.WriteLine(retval); Console.Read(); } else { Console.WriteLine("Not found"); Console.Read(); } } static int linearsearch(int[] arr, int var1) { int pos = 0; int posfound = 0; foreach (var item in arr) { pos = pos + 1; if (item == var1) { posfound = pos; if (posfound >= 1) break; } } return posfound; } } } 项，但我不断获得空指针异常。我没有使用ListView的东西吗？有人有任何见解吗？

这是我的适配器类：

convertView

以下是错误日志：

package com.lucasmikesoftware.messaround;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.ArrayList;


public class MyAdapter extends ArrayAdapter<AdapterData> {
private int layoutId;
public MyAdapter(Context context, ArrayList<AdapterData> data, int layoutId) {
    super(context, R.layout.events_list_item, data);
    this.layoutId = layoutId;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(getItem(position) instanceof ImageAdapterData){
        return setImageListItem(position,parent);
    } else if (getItem(position) instanceof VideoAdapterData){
        return setVideoListItem(position,parent);
    } else if (getItem(position) instanceof EventAdapterData){
        return setEventListItem(position,parent);
    } else{
        return setNormalListItem(position,parent);
    }


}

public View setNormalListItem(int position,ViewGroup parent){
    LayoutInflater theInflater = LayoutInflater.from(getContext());
    View theView = theInflater.inflate(layoutId,parent,false);
    AdapterData adapterData = getItem(position);
    TextView theTextView = (TextView) theView.findViewById(R.id.normal_list_item_title);
    theTextView.setText(adapterData.getTitle());
    TextView theFullTextTextView = (TextView) theView.findViewById(R.id.normal_list_item_full_text);
    theFullTextTextView.setText(adapterData.getFullText());
    return theView;
}

public View setImageListItem(int position,ViewGroup parent){
    LayoutInflater theInflater = LayoutInflater.from(getContext());
    View theView = theInflater.inflate(layoutId,parent,false);
    ImageAdapterData adapterData = (ImageAdapterData) getItem(position);
    TextView theTextView = (TextView) theView.findViewById(R.id.image_list_item_title);
    theTextView.setText(adapterData.getTitle());
    TextView theFullTextTextView = (TextView) theView.findViewById(R.id.image_list_item_full_text);
    theFullTextTextView.setText(adapterData.getFullText());
    ImageView theImageView = (ImageView) theView.findViewById(R.id.image_list_item_image);
    Picasso.with(getContext()).load(adapterData.getImageUrl()).into(theImageView);
    return theView;
}

public View setEventListItem(int position,ViewGroup parent){
    LayoutInflater theInflater = LayoutInflater.from(getContext());
    View theView = theInflater.inflate(layoutId,parent,false);
    EventAdapterData adapterData = (EventAdapterData) getItem(position);
    TextView theTextView = (TextView) theView.findViewById(R.id.text_view);
    theTextView.setText(adapterData.getTitle());
    ImageView theImageView = (ImageView) theView.findViewById(R.id.event_image_view);
    Picasso.with(getContext()).load(adapterData.getImageUrl()).into(theImageView);
    return theView;
}

public View setVideoListItem(int position,ViewGroup parent){
    //TODO Finish this damn thing
    return parent;
}

}