以下是我想要特定数据的JSON文件：
{"android":[{"username":"kripa","company":"natgeo","client":"sandeep","client_no":"8745961587","callback":"2016-12-29 11:30:00"},
{"username":"daksh","company":"greengold","client":"Suresh","client_no":"5789486589","callback":"2016-12-16 15:14:00"},
{"username":"usman","company":"HDFC","client":"lokesh","client_no":"8794562153","callback":"2016-12-28 14:00:00"}]}
如果json文件中的用户名是kripa，那么我只需要在Listview中显示它。请帮我... 以下是我的活动文件：
@Override
public void onLoaded(List<AndroidVersion> androidList) {
for (AndroidVersion android : androidList) {
HashMap<String, String> map = new HashMap<>();
map.put(KEY_USERNAME, android.getUsername());
map.put(KEY_COMPANY, android.getCompany());
map.put(KEY_CLIENT, android.getClient());
map.put(KEY_CLIENT_NO, android.getClient_no());
map.put(KEY_CALLBACK, android.getCallback());
mAndroidMapList.add(map);
}
}
loadListView();
}
@Override
public void onError() {
Toast.makeText(this, "Error !", Toast.LENGTH_SHORT).show();
}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(this, mAndroidMapList.get(i).get(KEY_CLIENT_NO),Toast.LENGTH_LONG).show();
}
private void loadListView() {
ListAdapter adapter = new SimpleAdapter(AboutUsActivity.this, mAndroidMapList, R.layout.list_item,
new String[] { KEY_USERNAME,KEY_COMPANY, KEY_CLIENT, KEY_CLIENT_NO, KEY_CALLBACK },
new int[] { R.id.username,R.id.company,R.id.client, R.id.client_no,R.id.callback });
mListView.setAdapter(adapter);
}
}
下面是LoadJSONTask类：
public class LoadJSONTask extends AsyncTask<String, Void, Response> {
public LoadJSONTask(Listener listener) {
mListener = listener;
}
public interface Listener {
void onLoaded(List<AndroidVersion> androidList);
void onError();
}
private Listener mListener;
@Override
protected Response doInBackground(String... strings) {
try {
String stringResponse = loadJSON(strings[0]);
Gson gson = new Gson();
return gson.fromJson(stringResponse, Response.class);
} catch (IOException e) {
e.printStackTrace();
return null;
} catch (JsonSyntaxException e) {
e.printStackTrace();
return null;
}
}
@Override
protected void onPostExecute(Response response) {
if (response != null) {
mListener.onLoaded(response.getAndroid());
} else {
mListener.onError();
}
}
private String loadJSON(String jsonURL) throws IOException {
URL url = new URL(jsonURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.connect();
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
StringBuilder response = new StringBuilder();
while ((line = in.readLine()) != null) {
response.append(line);
}
in.close();
return response.toString();
}
}