我是android新手。我试图从数据库中获取spinner中的数据。但是我不知道为什么我的列表没有设置在微调器中。
我的代码是
public class AddBasicDetail extends Fragment implements AdapterView.OnItemSelectedListener {
// array list for spinner adapter
private ArrayList<State> categoriesList;
ProgressDialog pDialog;
Spinner sp_state;
// API urls
// Url to create new category
private String URL_NEW_CATEGORY = "http://mandirdekhoo.com/app/md_eng/state.php";
public AddBasicDetail() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.add_basic_detail, container, false);
sp_state = (Spinner) v.findViewById(R.id.sp_state);
categoriesList = new ArrayList<State>();
// spinner item select listener
//sp_state.setOnItemSelectedListener((AdapterView.OnItemSelectedListener) getActivity());
new GetCategories().execute();
return v;
}
/**
* Adding spinner data
* */
private void populateSpinner() {
List<String> lables = new ArrayList<String>();
//txtCategory.setText("");
for (int i = 0; i < categoriesList.size(); i++) {
lables.add(categoriesList.get(i).getName());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(),
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
spinnerAdapter .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
sp_state.setAdapter(spinnerAdapter);
}
/**
* Async task to get all food categories
* */
private class GetCategories extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getContext());
pDialog.setMessage("Fetching food categories..");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_NEW_CATEGORY, ServiceHandler.GET);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
Log.e("my response: ", "> " + jsonObj);
if (jsonObj != null) {
JSONArray categories = jsonObj .getJSONArray("result");
for (int i = 0; i < categories.length(); i++) {
JSONObject catObj = (JSONObject) categories.get(i);
State cat = new State(catObj.getInt("id"),
catObj.getString("state_name"));
categoriesList.add(cat);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
//populateSpinner();
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(
getContext(),
parent.getItemAtPosition(position).toString() + " Selected" ,
Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
}
我的服务处理程序类
public class ServiceHandler {
static InputStream is = null;
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
public ServiceHandler() {
}
/**
* Making service call
* @url - url to make request
* @method - http request method
* */
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
/**
* Making service call
* @url - url to make request
* @method - http request method
* @params - http request params
* */
public String makeServiceCall(String url, int method,
List<NameValuePair> params) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
httpPost.setEntity(new UrlEncodedFormEntity(params));
}
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
response = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error: " + e.toString());
}
return response;
}
}
和
public class State {
private int id;
private String name;
public State(){}
public State(int id, String name){
this.id = id;
this.name = name;
}
public void setId(int id){
this.id = id;
}
public void setName(String name){
this.name = name;
}
public int getId(){
return this.id;
}
public String getName(){
return this.name;
}
}
请帮忙
答案 0 :(得分：0)
嘿，在得到正确答案后尝试添加此代码
例如我正在尝试硬编码的值。用你的json替换它。
var Home = React.createClass({
render: function() {
return (
<div>
<img src="images/12.jpg" />
<img src="images/11.jpg" />
<img src="images/13.jpg" />
<img src="images/14.jpg" />
</div>
)
}
})
希望这会有所帮助。：）
答案 1 :(得分：0)
像这样改变你的方法
private void populateSpinner(List<String> categoriesList) {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < categoriesList.size(); i++) {
lables.add(categoriesList.get(i).getName());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(),
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
spinnerAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
sp_state.setAdapter(spinnerAdapter);
}
调用此方法后notifydatasetchanged()调用此方法。
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
populateSpinner(categoriesList);
}
希望这会对你有所帮助