Java 在Listview适配器中添加项后notifyDataSetChanged()不工作
我正在尝试将请求结果中的项目添加到列表视图中。但是,该列表将不会更新。我有一个for循环,它贯穿并添加所有县,在addcounty方法中,它将Java 在Listview适配器中添加项后notifyDataSetChanged()不工作,java,android,listview,adapter,Java,Android,Listview,Adapter,我正在尝试将请求结果中的项目添加到列表视图中。但是,该列表将不会更新。我有一个for循环,它贯穿并添加所有县,在addcounty方法中,它将notifydatasetchange()。但是,这不会更新GUI。下面是我的示例代码 new Response.Listener<JSONArray>() { // Takes the response from the JSON request @Ov
notifydatasetchange()
。但是,这不会更新GUI
。下面是我的示例代码
new Response.Listener<JSONArray>() {
// Takes the response from the JSON request
@Override
public void onResponse(JSONArray response) {
try {
for (int i = 0; i < response.length(); i++) {
JSONObject countryObject = response.getJSONObject(i);;
String flagURI= ""+countryObject.getString("flag");
String studentOne = ""+countryObject.getString("studentOne");
String studentTwo = ""+countryObject.getString("studentTwo");
String teacher = ""+ countryObject.getString("teacher");
String name = ""+ countryObject.getString("Name");
rez=rez+""+countryAdapter.getCount();
countryAdapter.add(new Country(name, teacher, studentOne, studentTwo,0,0,flagURI));;
}
tvName = (TextView) findViewById( R.id.tvName );
tvName.setText( "one");
countryAdapter.updateList(countries);
tvName.setText( rez);
}
// Try and catch are included to handle any errors due to JSON
catch (JSONException e) {
// If an error occurs, this prints the error to the log
tvName = (TextView) findViewById( R.id.tvName );
tvName.setText( "BAD NEWS1" + e);
e.printStackTrace();
}
catch (Exception e) {
tvName = (TextView) findViewById( R.id.tvName );
tvName.setText( "BAD NEWS3" + e);
}
}
},
public class CountryAdapter extends BaseAdapter {
LayoutInflater mInflater;
String score;
ArrayList<Country> countries;
public CountryAdapter(Context c,Country[] country) {
this.countries = new ArrayList<Country>( Arrays.asList(country));;
mInflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void updateList(Country[] data) {
this.countries = new ArrayList<Country>( Arrays.asList(data));;
this.notifyDataSetChanged();
}
public void add(Country data) {
this.countries.add(data);
}
}
newresponse.Listener(){
//获取JSON请求的响应
@凌驾
公共void onResponse(JSONArray响应){
试一试{
对于(int i=0;i
在for循环中
countryAdapter.add(new Country(name, teacher, studentOne, studentTwo,0,0,flagURI));;
它使用add方法在countryAdapter的countries对象中添加Country对象。
然后,在for loop之后,在下面的行中:
countryAdapter.updateList(countries);
在这里,updateList方法中传递的“countries”列表对象替换countryAdapter类的countries列表对象
您必须更新for循环中的主类“countries”对象
countries.add(新国家(姓名、教师、学生姓名、学生姓名、0,0、flagURI))代码>适配器中的getview()
overide方法在哪里?