您好，我是 android 新手，我很难在 daynamic listview 中添加元素。当我单击 TextView(tv) 时，它应该在 ArrayList 的末尾添加元素，但是当我向下滚动到 listview 时，它会因 indexoutofbound 异常而崩溃。
public class PosterList extends Activity
{
MyCustomAdapter dataAdapter = null;
ArrayList<Country> countryList = new ArrayList<Country>();
TextView tv;
@Override
public 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(this,R.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;
}
@Override
public 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;
}
}
}
这是我的 Country 课程，有人可以帮我看看这段代码有什么问题吗？
`enter code here`public class Country {
String code = null;
String name = null;
String continent = null;
String region = null;
public Country(String code, String name, String continent, String region) {
super();
this.code = code;
this.name = name;
this.continent = continent;
this.region = region;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContinent() {
return continent;
}
public void setContinent(String continent) {
this.continent = continent;
}
public String getRegion() {
return region;
}
public void setRegion(String region) {
this.region = region;
}
@Override
public String toString() {
return code + " " + name + " "
+ continent + " " + region;
}