java如何从ClickListener上的listview获取id值
我想从listview
获取id,而不是位置。id在JSON文件中,所以当我在listview
中显示数据时,当我单击它时,我从JSON文件中获取该驱动程序的id
[{lastName=wdkj fsj, firstName=jf jfn, id=1}, {lastName=singh, firstName=sunny, id=2}]
public class DriverData extends AppCompatActivity {
private String TAG = DriverData.class.getSimpleName();
ArrayAdapter<String> adapter;
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "http://54.148.120.200:3000/getDrivers";
ArrayList<HashMap<String, String>> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.driver_data);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.simpleListView);
new DriverData.GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(DriverData.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("drivers");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString("id");
JSONObject user = c.getJSONObject("user");
String firstName = user.getString("firstName");
String lastName = user.getString("lastName");
// Phone node is JSON Object
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("firstName", firstName);
contact.put("lastName", lastName);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
System.out.println(contactList);
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
DriverData.this, contactList,
R.layout.list_item, new String[]{"firstName", "lastName"
}, new int[]{R.id.name, R.id.lastName});
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
}
});
}
}
}
# 1 楼答案
您在联系人列表中有它,您可以简单地检索它
在setOnItemClickListener()中执行此操作
# 2 楼答案
首先,创建POJO模型以保存对象并轻松使用它们
这只是一个POJO模型类,但是如果您想获得更多关于它的信息,您可以按照下面的link
注意:变量应该是
private
,方法应该是public
然后,最好创建自己的自定义适配器
然后,从JSON链接获取所有数据后,将数据发送给构造函数。 我将更新您的来源:
同时更新
onPostExecute()
方法如果您有任何错误,请在此处进行评论,我将更新。尚未测试,但我认为这将有帮助。享受吧