我发现几个问题,如这些,我也感到我应该使用setOnItemClickListener
为:可选择定制的ListView
listView.setOnItemClickListener(new AdapterView.OnItemClickListener(position) {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String Value = listView.getItemAtPosition();
}
});
但是,我不能得到这个工作。它有点棘手,因为我从JSON数组中动态生成listView。
我使用意向的数据作为一个字符串传递给DisplayListView
类:
public class DisplayListView extends AppCompatActivity {
String response;
JSONObject jsonObject;
JSONArray jsonArray;
DrinksAdapter drinksAdapter;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_listview_layout);
listView = (ListView) findViewById(R.id.listview);
drinksAdapter = new DrinksAdapter(this,R.layout.row_layout);
listView.setAdapter(drinksAdapter);
response = getIntent().getExtras().getString("json_data");
try {
jsonObject = new JSONObject(response);
jsonArray = new JSONObject(response).getJSONArray("Menu");
//jsonArray = jsonObject.getJSONArray("Menu");
int count = 0;
String ime,kolicina,cijena;
while(count < jsonArray.length()) {
JSONObject JO = jsonArray.getJSONObject(count);
ime = JO.getString("ime");
kolicina = JO.getString("kolicina");
cijena = JO.getString("cijena");
Drinks drinks = new Drinks(ime,kolicina,cijena);
drinksAdapter.add(drinks);
count++;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
在上文中,林循环通过阵列和初始化数据通过调用DrinksAdapter
:
public class DrinksAdapter extends ArrayAdapter {
List list = new ArrayList();
public DrinksAdapter(@NonNull Context context, @LayoutRes int resource) {
super(context, resource);
}
public void add(Drinks object) {
super.add(object);
list.add(object);
}
@Override
public int getCount() {
return list.size();
}
@Nullable
@Override
public Object getItem(int position) {
return list.get(position);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View row;
row = convertView;
DrinkHolder drinkHolder;
if(row == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.row_layout,parent,false);
drinkHolder = new DrinkHolder();
drinkHolder.tx_ime = (TextView) row.findViewById(R.id.tx_ime);
drinkHolder.tx_kolicina = (TextView) row.findViewById(R.id.tx_kolicina);
drinkHolder.tx_cijena = (TextView) row.findViewById(R.id.tx_cijena);
row.setTag(drinkHolder);
} else {
drinkHolder = (DrinkHolder) row.getTag();
}
Drinks drinks = (Drinks) this.getItem(position);
drinkHolder.tx_ime.setText(drinks.getIme());
drinkHolder.tx_kolicina.setText(drinks.getKolicina());
drinkHolder.tx_cijena.setText(drinks.getCijena());
return row;
}
static class DrinkHolder {
TextView tx_ime,tx_kolicina,tx_cijena;
}
}
Drinks
类正在被用来初始化变量。
我在哪里可以实现这个功能呢?
我知道我有很多东西需要学习,每天我这样做,它看起来像我只是有点停留在此刻:(
任何形式的帮助是高度赞赏。 谢谢!
要被点击或整个片段或整个列表列表中的某一个项目像? – phpdroid
这个想法是选择列表视图中的行,从中我可以找出那三个元素设置为TextViews – py9