问题描述

Arrayindexoutofboundsexception 异常

这个问题是关于android中customListview 的。我想使用onclick事件(tv.setOnClickListener)在list中动态的添加内容。我有自定义的country类使用geter and seter 方法来储存数据。当我动态的添加新的内容，然后滚动到list的底部时，获取 Arrayindexoutofboundexception 异常。

public class PosterList extends Activity    { MyCustomAdapter dataAdapter = null;ArrayList<Country> countryList = new ArrayList<Country>();TextView tv;@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.posterlist);            //Click on textview to add element in contrylist    tv = (TextView) findViewById(R.id.myFilter);    tv.setOnClickListener(new View.OnClickListener()     {            public void onClick(View v)             {                Country country = new Country(""df""df""df""m"");                countryList.add(country);                      dataAdapter.notifyDataSetChanged();            }    });    displayListView();}private void displayListView() {            //Parse my JSON and store it in to different arrays    for(int k=0;k<len;k++)    {        Country country = new Country(subcategory[k]caseid[k]time[k]newpost[k]);        countryList.add(country);    }    dataAdapter = new MyCustomAdapter(thisR.layout.country_info countryList);    ListView listView = (ListView) findViewById(R.id.listView1);    listView.setAdapter(dataAdapter);    listView.setOnItemClickListener(new OnItemClickListener()    {        public void onItemClick(AdapterView<?> parent View view            int position long id)         {                Country country = (Country) parent.getItemAtPosition(position);                Toast.makeText(getApplicationContext()                country.getContinent() Toast.LENGTH_SHORT).show();        }    });}private class MyCustomAdapter extends ArrayAdapter<Country> {    private ArrayList<Country> originalList;    private ArrayList<Country> countryList;    public MyCustomAdapter(Context context int textViewResourceId         ArrayList<Country> countryList) {    super(context textViewResourceId countryList);    this.countryList = new ArrayList<Country>();    this.countryList.addAll(countryList);    this.originalList = new ArrayList<Country>();    this.originalList.addAll(countryList);}private class ViewHolder {    TextView code;    TextView name;    TextView continent;    TextView region; }@Overridepublic View getView(int position View convertView ViewGroup parent) {    ViewHolder holder = null;    Log.v(""ConvertView"" String.valueOf(position));    if (convertView == null)     {        LayoutInflater vi = (LayoutInflater)getSystemService(            Context.LAYOUT_INFLATER_SERVICE);        convertView = vi.inflate(R.layout.country_info null);        holder = new ViewHolder();        holder.code = (TextView) convertView.findViewById(R.id.code);        holder.name = (TextView) convertView.findViewById(R.id.name);        holder.continent = (TextView) convertView.findViewById(R.id.continent);        holder.region = (TextView) convertView.findViewById(R.id.region);        convertView.setTag(holder);    }     else     {            holder = (ViewHolder) convertView.getTag();     }    Country country = countryList.get(position);    holder.code.setText(country.getCode());    holder.name.setText(country.getName());    holder.continent.setText(country.getContinent());    holder.region.setText(country.getRegion());    return convertView;  }   }}

解决方案

在你的 getView 方法中，你提到 countryList，有两个 countryList 变量：一个是在 PostList 类中，一个是在 MyCustomAdapter 类中。你提及到的那个是在 MyCustomerAdapter 类中，没有适配器支持数据。在 getView 方法获取 Country 对象：

Country country = (Country) getItem(position);

解决方案二：

            holder = (ViewHolder) convertView.getTag();     }    Country country = countryList.get(position);    holder.code.setText(country.getCode());    holder.name.setText(country.getName());    holder.continent.setText(country.getContinent());    holder.region.setText(country.getRegion());    return convertView;  }   }}

android

解决方案三：

if(position <=   countryList.size()){   Country country = countryList.get(position);        holder.code.setText(country.getCode());        holder.name.setText(country.getName());        holder.continent.setText(country.getContinent());        holder.region.setText(country.getRegion());        return convertView;}return null ;