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Я создаю цепочку, которая получает данные с сервера и возвращает ее json. мой фрэйзерный счетчик в порядке. во втором счетчике json дает ответ, но при попытке сохранить renspone в массиве асинхронную ошибку, вызванную ошибкой nullpointer. когда я проверяю его в log cat, в моем json-ответе нет значения null. поэтому я пытаюсь изменить имя массива с тем же именем, что и первый счетчик, нет ошибки, но второй счетчик показывает то же значение, что и первый счетчик. мой вопрос, почему мой второй счетчик, когда имя массива отличается от первого счетчика, является ошибкой? где ошибка nullpointerexception, потому что, когда я проверяю ее, нет нулевого значения? как его исправить?spinner fatalexception: asynctask # 2 произошла ошибка при выполнении doInBackground()
есть мой LoginActivity.java
// Email, password edittext
EditText txtEmail, txtPassword;
private static String KEY_LOGIN = "login";
private String URL_LOGIN = "http://api.omidev.com/login/format/json";
private String URL_PROV = "http://api.omidev.com/lokasi/jenis_lokasi/provinsi/format/json";
private String URL_KOTA = null;
private Spinner spinnerProv, spinnerKota, spinnerKec, spinnerDesa;
// array list for spinner adapter
private ArrayList<Category> categoriesList;
private ArrayList<Category> categoriesListKota;
ProgressDialog pDialog;
HttpPost httppost;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
String mSelected;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Session Manager
session = new SessionManager(getApplicationContext());
main = (RelativeLayout) findViewById(R.id.LayoutMain);
login = (RelativeLayout) findViewById(R.id.LayoutLogin);
regis = (RelativeLayout) findViewById(R.id.LayoutRegister);
// Email, Password input text
txtEmail = (EditText) findViewById(R.id.editText1);
txtPassword = (EditText) findViewById(R.id.editText2);
getActionBar().hide();
ubahTulisan();
}
private void ubahTulisan()
{
// Font path
String fontPath = "fonts/roboto_black.ttf";
// text view label
TextView txtMasuk = (TextView) findViewById(R.id.textView1);
TextView txtAkunBaru = (TextView) findViewById(R.id.TextView01);
// Loading Font Face
Typeface tf = Typeface.createFromAsset(getAssets(), fontPath);
// Applying font
txtMasuk.setTypeface(tf);
txtAkunBaru.setTypeface(tf);
}
public void login_click(View view)
{
main.setVisibility(-5);
login.setVisibility(1);
regis.setVisibility(-5);
}
public void regis_click(View view)
{
main.setVisibility(-5);
login.setVisibility(-5);
regis.setVisibility(1);
categoriesList = new ArrayList<Category>();
spinnerProv = (Spinner) findViewById(R.id.spinner1);
spinnerKota = (Spinner) findViewById(R.id.spinner2);
spinnerKec = (Spinner) findViewById(R.id.Spinner3);
spinnerDesa = (Spinner) findViewById(R.id.Spinner4);
// spinner item select listener
spinnerProv.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
try {
mSelected = URLEncoder.encode(categoriesList.get(position).getId().toString(), "utf-8");
URL_KOTA ="http://api.omidev.com/lokasi/jenis_lokasi/kota/id/"+mSelected+"/format/json";
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//new GetKota().execute();
Toast.makeText(
getApplicationContext(),
mSelected + " Selected" ,
Toast.LENGTH_LONG).show();
new GetKota().execute();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}});
// spinner item select listener
new GetCategories().execute();
}
public void login_cancel_click(View view)
{
main.setVisibility(1);
login.setVisibility(-5);
regis.setVisibility(-5);
}
public void regis_cancel_click(View view)
{
main.setVisibility(1);
login.setVisibility(-5);
regis.setVisibility(-5);
}
public void login_accept_click(View view)
{
main.setVisibility(-5);
login.setVisibility(1);
regis.setVisibility(-5);
new Login().execute();
}
public void regis_accept_click(View view)
{
main.setVisibility(-5);
login.setVisibility(1);
regis.setVisibility(-5);
}
private class Login extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(LoginActivity.this);
pDialog.setMessage("Validating User..");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(String... arg) {
String username = txtEmail.getText().toString();
String password = txtPassword.getText().toString();
if(username.trim().length() > 0 && password.trim().length() > 0){
// Preparing post params
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("email", username));
params.add(new BasicNameValuePair("password", password));
ServiceHandler serviceClient = new ServiceHandler();
String json = serviceClient.makeServiceCall(URL_LOGIN,
ServiceHandler.POST, params);
Log.d("Create Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
// checking for error node in json
if (jsonObj.getString(KEY_LOGIN) != null) {
// new category created successfully
JSONArray menuitemArray = jsonObj.getJSONArray("login");
for (int i = 0; i < menuitemArray.length(); i++) {
String id = menuitemArray.getJSONObject(i).getString("id_user").toString();
String email = menuitemArray.getJSONObject(i).getString("email").toString();
session.createLoginSession(""+id, ""+email.toString());
}
// Staring MainActivity
Intent a = new Intent(getApplicationContext(), MainActivity.class);
startActivity(a);
finish();
}
} catch (JSONException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
alert.showAlertDialog(LoginActivity.this, "Login failed..", "Email Atau Password Salah", false);
}
});
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
}else{
// user didn't entered username or password
// Show alert asking him to enter the details
runOnUiThread(new Runnable() {
public void run() {
alert.showAlertDialog(LoginActivity.this, "Login failed..", "Masukan Email dan Password", false);
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
}
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
private void populateSpinner() {
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>(this,
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
spinnerProv.setAdapter(spinnerAdapter);
}
private void populateSpinnerKota() {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < categoriesListKota.size(); i++) {
lables.add(categoriesListKota.get(i).getName());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
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
spinnerKota.setAdapter(spinnerAdapter);
}
private class GetCategories extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_PROV, ServiceHandler.GET);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray categories = jsonObj
.getJSONArray("lokasi");
for (int i = 0; i < categories.length(); i++) {
JSONObject catObj = (JSONObject) categories.get(i);
Category cat = new Category(catObj.getString("id_provinsi"),
catObj.getString("nama"));
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);
populateSpinner();
}
}
private class GetKota extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_KOTA, ServiceHandler.GET);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray categorieskota = jsonObj
.getJSONArray("lokasi");
for (int i = 0; i < categorieskota.length(); i++) {
JSONObject catObj = (JSONObject) categorieskota.get(i);
Log.e("Response Kota: ", "> " + catObj.getString("id_kota"));
Category catK = new Category(catObj.getString("id_kota"),
catObj.getString("nama"));
categoriesListKota.add(catK);
}
}
} 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);
populateSpinnerKota();
}
}
мой category.java
private String id;
private String name;
public Category(){}
public Category(String id, String name){
this.id = id;
this.name = name;
}
public void setId(String id){
this.id = id;
}
public void setName(String name){
this.name = name;
}
public String getId(){
return this.id;
}
public String getName(){
return this.name;
}
мой serviceHandler.java
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;
}
Это Logcat ошибка:
02-05 18:20:48.953: E/Response:(29903): > {"lokasi":[{"id_provinsi":"1","nama":"Bali"},{"id_provinsi":"2","nama":"Banten"},{"id_provinsi":"3","nama":"Bengkulu"},{"id_provinsi":"4","nama":"DI Yogyakarta"},{"id_provinsi":"5","nama":"DKI Jakarta"},{"id_provinsi":"6","nama":"Gorontalo"},{"id_provinsi":"7","nama":"Irian Jaya Barat"},{"id_provinsi":"8","nama":"Jambi"},{"id_provinsi":"9","nama":"Jawa Barat"},{"id_provinsi":"10","nama":"Jawa Tengah"},{"id_provinsi":"11","nama":"Jawa Timur"},{"id_provinsi":"12","nama":"Kalimantan Barat"},{"id_provinsi":"13","nama":"Kalimantan Selatan"},{"id_provinsi":"14","nama":"Kalimantan Tengah"},{"id_provinsi":"15","nama":"Kalimantan Timur"},{"id_provinsi":"16","nama":"Kep. Bangka Belitung"},{"id_provinsi":"17","nama":"Kep. Riau"},{"id_provinsi":"18","nama":"Lampung"},{"id_provinsi":"19","nama":"Maluku"},{"id_provinsi":"20","nama":"Maluku Utara"},{"id_provinsi":"21","nama":"Nanggroe Aceh Darussalaam"},{"id_provinsi":"22","nama":"Nusa Tenggara Barat"},{"id_provinsi":"23","nama":"Nusa Tenggara Timur"},{"id_provinsi":"24","nama":"Papua"},{"id_provinsi":"25","nama":"Riau"},{"id_provinsi":"26","nama":"Sulawesi Selatan"},{"id_provinsi":"27","nama":"Sulawesi Tengah"},{"id_provinsi":"28","nama":"Sulawesi Tenggara"},{"id_provinsi":"29","nama":"Sulawesi Utara"},{"id_provinsi":"30","nama":"Sumatra Barat"},{"id_provinsi":"31","nama":"Sumatra Selatan"},{"id_provinsi":"32","nama":"Sumatra Utara"}]}
02-05 18:20:49.573: E/Response:(29903): > {"lokasi":[{"id_kota":"1","id_provinsi":"1","nama":"KABUPATEN BADUNG"},{"id_kota":"2","id_provinsi":"1","nama":"KABUPATEN BANGLI"},{"id_kota":"3","id_provinsi":"1","nama":"KABUPATEN BULELENG"},{"id_kota":"4","id_provinsi":"1","nama":"KABUPATEN GIANYAR"},{"id_kota":"5","id_provinsi":"1","nama":"KABUPATEN JEMBRANA"},{"id_kota":"6","id_provinsi":"1","nama":"KABUPATEN KARANG ASEM"},{"id_kota":"7","id_provinsi":"1","nama":"KABUPATEN KLUNGKUNG"},{"id_kota":"8","id_provinsi":"1","nama":"KABUPATEN TABANAN"},{"id_kota":"9","id_provinsi":"1","nama":"KOTA DENPASAR"}]}
02-05 18:20:49.573: E/Response Kota:(29903): > 1
02-05 18:20:49.573: W/dalvikvm(29903): threadid=16: thread exiting with uncaught exception (group=0x415b1360)
02-05 18:20:49.603: E/AndroidRuntime(29903): FATAL EXCEPTION: AsyncTask #2
02-05 18:20:49.603: E/AndroidRuntime(29903): java.lang.RuntimeException: An error occured while executing doInBackground()
02-05 18:20:49.603: E/AndroidRuntime(29903): at android.os.AsyncTask$3.done(AsyncTask.java)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-05 18:20:49.603: E/AndroidRuntime(29903): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.lang.Thread.run(Thread.java:856)
02-05 18:20:49.603: E/AndroidRuntime(29903): Caused by: java.lang.NullPointerException
02-05 18:20:49.603: E/AndroidRuntime(29903): at com.android.desaku.LoginActivity$GetKota.doInBackground(LoginActivity.java:377)
02-05 18:20:49.603: E/AndroidRuntime(29903): at com.android.desaku.LoginActivity$GetKota.doInBackground(LoginActivity.java:1)
02-05 18:20:49.603: E/AndroidRuntime(29903): at android.os.AsyncTask$2.call(AsyncTask.java)
02-05 18:20:49.603: E/AndroidRuntime(29903): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-05 18:20:49.603: E/AndroidRuntime(29903): ... 5 more
, пожалуйста, помогите мне спасибо. жаль, что я не знаю, как отправить LogCat
удалить 'startActivity (а); finish(); 'from' InBackground' –
не то, что login asynctask, но в getKota asynctask – AFR