Android 在listview中添加项时发生IndexAutofBound异常
你好,我是android新手 我很难在daynamic listview中添加元素。 当我点击TextView(tv)时,它应该是ArrayList末尾的add元素,但当我向下滚动到listview时,它崩溃了,出现indexoutofbound异常Android 在listview中添加项时发生IndexAutofBound异常,android,android-listview,indexoutofboundsexception,Android,Android Listview,Indexoutofboundsexception,你好,我是android新手 我很难在daynamic listview中添加元素。 当我点击TextView(tv)时,它应该是ArrayList末尾的add元素,但当我向下滚动到listview时,它崩溃了,出现indexoutofbound异常 public class PosterList extends Activity { MyCustomAdapter dataAdapter = null; ArrayList<Country> countryList = new
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;
}
}
}
去掉适配器中的这些字段
private ArrayList<Country> originalList;
private ArrayList<Country> countryList;
private ArrayList originalist;
私有ArrayList国家列表;
您正在修改正在适配器中传递给超级调用的countryList,但您正在从countryList中读取,该countryList存储为适配器中的一个字段,当您添加新国家/地区时,该字段永远不会被修改
您正在创建原始国家/地区列表的副本。。但是在创建副本后,您永远不会修改它放置堆栈跟踪!!我猜这些数组中的一个或所有数组都小于
len
:子类别[k]、caseid[k]、time[k]、newpost[k]
。。。但是我们该怎么帮你呢?嗨谢谢你的帮助response@user1259670-我不知道你在问什么关于你的国家班。您正在调用super();在一个没有超类可调用的类中。。
private ArrayList<Country> originalList;
private ArrayList<Country> countryList;