Android - How to get calling Activity?

Android - How to get calling Activity? - android

An Activity (SignInActivity) is calling a method in FunkcjeAPI which execute an AsyncTask.
My AsyncTask should show a ProgressDialog using an calling Activity. I don't know how to give it an correct Activity to the constructor. I tried a lot of thing, read a lot of tutorials and questions on SO, but I can't find solution. FunkcjeAPI isn't an Activity so I can't write new Logowanie(this).execute(argumenty);
AsyncTask calling code :
public class FunkcjeAPI {
static String dozwrotu = null;
public static String zalogujSie(final String nick, final String haslo)
{
String[] argumenty = {nick, haslo};
new Logowanie(/* WHAT HERE ? */).execute(argumenty); // HELP ME IN THAT LINE !!!!!!!!!!!!!
return dozwrotu;
}
My AsyncTask class code (it is in FunkcjeAPI class):
private class Logowanie extends AsyncTask<String, Void, String>
{
Activity wywolujaceActivity;
public Logowanie(Activity wywolujaceActivity) {
this.wywolujaceActivity = wywolujaceActivity;
}
#SuppressWarnings("deprecation")
#Override
protected void onPreExecute() {
wywolujaceActivity.showDialog(SignInActivit.PLEASE_WAIT_DIALOG);
}
#Override
protected String doInBackground(final String... argi) {
final JSONParser jParser = new JSONParser();
new Thread(new Runnable() {
public void run() {
final String json = jParser.getJSONFromUrl("http://tymonradzik.pl/THUNDER_HUNTER/thapi.php?q=login&username=" + argi[0] + "&password=" + argi[1] + "&imei=");
Handler mainHandler = new Handler(Looper.getMainLooper());
mainHandler.post(new Runnable() {
#Override
public void run() {
JSONObject jObject;
try {
jObject = new JSONObject(json);
Log.wtf("Link", "http://tymonradzik.pl/THUNDER_HUNTER/thapi.php?q=login&username=" + argi[0] + "&password=" + argi[1] + "&imei=");
Log.wtf("Link", json);
String error = jObject.getString("error");
if(error == "You reached daily query limit !") { nadajWartosc("You reached daily query limit !"); }
if(error == "0") {nadajWartosc(jObject.getString("token"));}
if(error == "1") {nadajWartosc("1");}
if(error == "Invalid username") {nadajWartosc("Invalid username");}
if(error == "Invalid password") {nadajWartosc("Invalid password");}
if(error == "This user is already logged in !") {nadajWartosc("This user is already logged in !");}
} catch (JSONException e1) {
e1.printStackTrace();
}
catch (NullPointerException e)
{
e.printStackTrace();
}
}
});
}}).start();
return dozwrotu;
}
#Override
protected void onPostExecute(String result) {
wywolujaceActivity.removeDialog(SignInActivit.PLEASE_WAIT_DIALOG);
}
}

Add one more parameter to zalogujSie() method that takes an Activity, and then use this parameter to start the AsyncTask:
public static String zalogujSie(Activity activity, final String nick, final String haslo)
{
// .....
new Logowanie(activity).execute(argumenty);
return dozwrotu;
}
Then you would call this method from the activity like this:
FunkcjeAPI.zalogujSie(this, "Nick", "Haslo");

Related

How to fix AsyncTask params error?

I am working on a registration based project that uses asyncTask. But I am getting errors on its params and the background usage tasks.
Snippet -
public class signupActivity extends AppCompatActivity {
EditText edit_name;
EditText edit_usn;
EditText edit_addnum;
EditText edit_pass;
EditText edit_repass;
Button btn_sign;
private static final String REGISTER_URL="http://abcd.000webhostapp.com/signup.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
edit_name=(EditText)findViewById(R.id.id_name);
edit_usn=(EditText)findViewById(R.id.id_usn);
edit_addnum=(EditText)findViewById(R.id.id_add);
edit_pass=(EditText)findViewById(R.id.id_pass);
edit_repass=(EditText)findViewById(R.id.id_repass);
btn_sign=(Button)findViewById(R.id.btn_signup);
btn_sign.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
registerUser();
}
});
}
private void registerUser() {
String name=edit_name.getText().toString().trim().toLowerCase();
String usn=edit_usn.getText().toString().trim().toLowerCase();
String addnum=edit_addnum.getText().toString();
String pass=edit_pass.getText().toString().trim().toLowerCase();
String repass=edit_repass.getText().toString().trim().toLowerCase();
register(name, usn, addnum, pass, repass);
}
private void register(String name,String usn,String addnum,String pass,String repass) {
String urlsuffix = "?name=" + name + "&usn=" + usn + "&ddnum=" + addnum + "&pass=" + pass + "&repass=" + repass;
//Getting **illegal start of type** for void keyword here
class RegisterUser extends AsyncTask <String, void, String> implements abcd.project2.RegisterUser {
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(signupActivity.this, "please wait", null, true, true);
}
//Getting **method does not override or implement a method from a supertype** for override here
#Override
protected void onPostExecute() {
super.onPreExecute();
Toast.makeText(getApplicationContext(), "Internet not found", Toast.LENGTH_SHORT).show();
}
#Override
protected String doInBackground(String... params) {
String s = params[0];
BufferedReader bufferReader = null;
try {
URL url = new URL(REGISTER_URL + s);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
bufferReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String result;
result = bufferReader.readLine();
return result;
} catch (Exception e) {
return null;
}
}
}
RegisterUser ur = new RegisterUser();
ur.execute(urlsuffix);
}
public void openCreateList(View view) {
Intent i = new Intent(this, createActivity.class);
startActivity(i);
}}
Error messages -
Error:(56, 50) error: illegal start of type Error:(65, 9) error:
method does not override or implement a method from a supertype
How do I solve these?
I tried changing the return type in params but still I am unable to solve the error.

Try this
Its Void not void in parameter of AsyncTask
You need to change your onPostExecute() method just pass String parameter in onPostExecute() method
Change your code like below code
SAMPLE CODE
private void register(String name,String usn,String addnum,String pass,String repass) {
String urlsuffix = "?name=" + name + "&usn=" + usn + "&ddnum=" + addnum + "&pass=" + pass + "&repass=" + repass;
//Getting **illegal start of type** for void keyword here
class RegisterUser extends AsyncTask<String, Void, String> implements abcd.project2.RegisterUser {
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(signupActivity.this, "please wait", null, true, true);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
#Override
protected String doInBackground(String... params) {
String s = params[0];
BufferedReader bufferReader = null;
try {
URL url = new URL(REGISTER_URL + s);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
bufferReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String result;
result = bufferReader.readLine();
return result;
} catch (Exception e) {
return null;
}
}
}
RegisterUser ur = new RegisterUser();
ur.execute(urlsuffix);
}
You can read more about AsyncTask

change word "void" to Void in the line of class RegisterUser extends AsyncTask <String, void, String> implements abcd.project2.RegisterUser
The three types used by an asynchronous task are the following:
Params, the type of the parameters sent to the task upon execution.
Progress, the type of the progress units published during the background computation.
Result, the type of the result of the background computation.
Not all types are always used by an asynchronous task. To mark a type as unused, simply use the type Void:
private class MyTask extends AsyncTask { ... }
refer this Official document site :

1.Change void to Void
2.change your onPostExecute()
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Toast.makeText(getApplicationContext(), "Internet not found", Toast.LENGTH_SHORT).show();
}

Volley second request return null

The first request done successfully but second request in queue return null , when setting break point and start debugging the second request get it's value successfully
class ListLoader extends AsyncTask<Void,Void,MerchantCategories[]>
{
MerchantCategories[] data;
protected void onPreExecute() {
progressBar.setVisibility(View.VISIBLE);
}
#Override
protected MerchantCategories[] doInBackground(Void... params) {
Gson g = new Gson();
gcm = GoogleCloudMessaging.getInstance(getApplicationContext());
try {
regid = gcm.register(PROJECT_NUMBER);
String msg="";
msg = "Device registered, registration ID=" + regid;
Log.i("GCM", msg);
EgxServices.getJsonFrom("http://inareg.com/APIs/RegisterAndroidDevice?registrationID="+regid,(Activity) c);
} catch (IOException e) {
e.printStackTrace();
}
MerchantCategories[] categs=g.fromJson(EgxServices.getJsonFrom("http://inareg.com/APIs/ListMerchantCategories",(Activity) c),MerchantCategories[].class);
return categs;
}
protected void onPostExecute(MerchantCategories[] response) {
if(response == null) {
progressBar.setVisibility(View.GONE);
}
else{
progressBar.setVisibility(View.GONE);
MerchantCategoriesAdp adp =new MerchantCategoriesAdp(c,R.layout.lst_merchant_categories,response);
drawerList.setAdapter(adp);
// Log.i("INFO", response);
// responseView.setText(response);
}
}
}
This method which i used to initialize a new request and return JSON String
public static String getJsonFrom(final String urlStr, Activity context) {
final Context c = context;
final SharedValue value = new SharedValue();
String result="";
StringRequest request = new StringRequest(Request.Method.GET,urlStr,new Response.Listener<String>(){
#Override
public void onResponse(String response) {
value.setResult(response);
}
},new Response.ErrorListener(){
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(c, "No Internet Connection",
Toast.LENGTH_LONG).show();
}
});
Volley.newRequestQueue(c).add(request);
return value.getResult();
}
as you can see that first request
EgxServices.getJsonFrom("http://inareg.com/APIs/RegisterAndroidDevice?registrationID="+regid,(Activity) c);
run successfully but the second one ,
EgxServices.getJsonFrom("http://inareg.com/APIs/ListMerchantCategories",(Activity) c);
always return null value ...
i need to know why ?????!!!

Try this :
request.setShouldCache(false);
before Volley.newRequestQueue(c).add(request);

Android Volley Request Identity onErrorResponse Section

public void getTestDats(String unique_id) {
final String tag = "testList";
String url = Constants.BASE_URL + "test_module.php";
Map<String, String> params = new HashMap<String, String>();
params.put("user_id", SharedPreferenceUtil.getString(Constants.PrefKeys.PREF_USER_ID, "1"));
params.put("unique_id", unique_id);//1,2,3,4,5
DataRequest loginRequest = new DataRequest(Method.POST, url, params, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
switch (response.optInt("unique_id")) {
case 1:
//task 1
break;
case 2:
//task 2
break;
default:
//nothing
}
}
}, new ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
//I want to know which unique_id request is failed
}
});
loginRequest.setRetryPolicy(new DefaultRetryPolicy(20000, 0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(loginRequest, tag);
}
I'm trying to identity which request is failed with having unique_id.
I'm calling getTestDats("1") function with unique_id. And function called 10 times and all the api call in addToRequestQueue.
When API go into Success part its working as per code.
But when API go into Error part I didn't identity the request.
Is there any way to know my request param so I can retry with particular unique_id request.

set a field in loginRequest and in onErrorResponse access the field like loginRequest.getUniqueId()
Alternatively, create a seperate class that implements Response.Listener and ErrorListener
Response Listener class:
public class MyReponseListener implements Response.Listener<JSONOBject>{
private long uniqId;
public MyResponseListener(long uniqId){
this.uniqId = uniqId;
}
#Override
public void onResponse(JSONObject response) {
System.out.println("response for uniqId " + uniqId);
// do your other chit chat
}
}
ErrorListener class:
public class MyErrorListener implements ErrorListener{
private long uniqId;
public MyErrorListener(long uniqId){
this.uniqId = uniqId;
}
#Override
public void onErrorResponse(VolleyError error) {
System.out.println("Error for uniqId : " + uniqId);
}
}
Now call it like:
DataRequest loginRequest = new DataRequest(Method.POST, url, params, new MyResponeListener(uniqId), new MyErrorListener(uniqId));
Now if you want some code of the calling class to be accessible in the ErrorListener class then do the following:
1. In calling class put the codes you want to access in methods
2. Create an interface with those method
3. The calling class will implement that interface
4. Pass the interface to constructor of the MyErrorListener or MyResponseListener
for example an activity calls the volley request, on error you want to show a message.
put that show error codes in a method:
public void showMessage(int errorCode){
//message according to code
}
now create an interface
public interface errorMessageInterface{
void showMessage(int errorCode);
}
the activity will implement errorMessageInterface and pass this to the constructor of MyErrorListener and save it in a field.
Inside onErrorResponse, you will call
field.showMessage()

You can parse error response in the same way as you parse success response. I use similar solution in my projects.
public class VolleyErrorParser {
private VolleyError mError;
private String mBody;
private int mUniqueId = -1;
public VolleyErrorParser(VolleyError e){
mError = e;
parseAnswer();
parseBody();
}
private void parseBody() {
if (mBody==null)
return;
try{
JSONObject response = new JSONObject(mBody);
mUniqueId = response.getOptInt("unique_id");
}catch (JSONException e){
e.printStackTrace();
}
}
private void parseAnswer() {
if (mError!=null&&mError.networkResponse!=null&&mError.networkResponse.data!=null){
mBody = new String(mError.networkResponse.data);
}
}
public String getBody(){
return mBody;
}
public int getUniqueId(){
return mUniqueId;
}
}
Use:
...
, new ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
int id = new VolleyErrorParse(error).getUniqueId();
switch (id) {
case -1:
//unique id not found in the answer
break;
case 1:
//task 1
break;
case 2:
//task 2
break;
default:
//nothing
}
}
}
...

Just add this code to identify which type of error you are facing.Add this in your onError() method :
if (error instanceof TimeoutError) {
Log.e(TAG, "TimeoutError");
} else if (error instanceof NoConnectionError) {
Log.e(TAG,"tNoConnectionError");
} else if (error instanceof AuthFailureError) {
Log.e(TAG,"AuthFailureError");
} else if (error instanceof ServerError) {
Log.e(TAG,"ServerError");
} else if (error instanceof NetworkError) {
Log.e(TAG,"NetworkError");
} else if (error instanceof ParseError) {
Log.e(TAG,"ParseError");
}

Log the unique_id before making a request i.e; after params.put("unique_id", unique_id);//1,2,3,4,5. And also once you get the response in onResponse() method. And cross verify what exactly is happening.

most of the solutions here will "work" but they are too complex .. for me :)
here is the simplest option with least code change I can think of:
...
final Map<String, String> params = new HashMap<String, String>();
params.put("user_id", SharedPreferenceUtil.getString(Constants.PrefKeys.PREF_USER_ID, "1"));
params.put("unique_id", unique_id);//1,2,3,4,5
DataRequest loginRequest = new DataRequest(Method.POST, url, params, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
switch (params.get("unique_id")) {
case 1:
//task 1
break;
case 2:
//task 2
break;
default:
//nothing
}
}
...

All the above answers seem to be correct.But i recommend you to do this in an optimized way. If you will add error handling code in all onErrorResponse() then it will create duplication. So create a seperate method in Utils or some other class and just call that method by passing error object to the method. Also you can inflate some dialog or toast to display an error message.
public static void handleError(final Context context, String alertTitle,
Exception exception, String logTag) {
if (context != null) {
if (exception instanceof TimeoutError)
message = context.getString(R.string.TimeoutError);
else if (exception instanceof NoConnectionError)
message = context.getString(R.string.NoConnectionError);
else if (exception instanceof AuthFailureError)
message = context.getString(R.string.AuthFailureError);
else if (exception instanceof ServerError)
message = context.getString(R.string.ServerError);
else if (exception instanceof NetworkError)
message = context.getString(R.string.NetworkError);
else if (exception instanceof ParseError)
message = context.getString(R.string.ParseError);
message = exception.getMessage();
DialogHelper.showCustomAlertDialog(context, null,
alertTitle, message, "ok",
new OnClickListener() {
#Override
public void onClick(DialogInterface dialog,
int which) {
}
}, null, null);
}
}

I think you have to make one conman method on Base class. As given bellow which I used in my code for calling php web api
/**
* <h1> Use for calling volley webService </h1>
*
* #param cContext Context of activity from where you call the webService
* #param mMethodType Should be POST or GET
* #param mMethodname Name of the method you want to call
* #param URL Url of your webService
* #param mMap Key Values pairs
* #param initialTimeoutMs Timeout of webService in milliseconds
* #param shouldCache Web Api response are stored in catch(true) or not(false)
* #param maxNumRetries maximum number in integer for retries to execute webService
* #param isCancelable set true if you set cancel progressDialog by user event
* #param aActivity pass your activity object
*/
public void callVolley(final Context cContext, String mMethodType, final String mMethodname, String URL,
final HashMap<String, String> mMap, int initialTimeoutMs, boolean shouldCache, int maxNumRetries,
Boolean isProgressDailogEnable, Boolean isCancelable, final Activity aActivity) {
mMap.put("version_key_android",BuildConfig.VERSION_NAME+"");
if (!isOnline(cContext)) {
//showErrorDailog(aActivity, Constant.PleaseCheckInternetConnection, R.drawable.icon);
} else {
StringRequest jsObjRequest;
int reqType = 0;
String RequestURL = URL.trim();
queue = Volley.newRequestQueue(cContext);
if (isProgressDailogEnable) {
customLoaderDialog = new CustomLoaderDialog(cContext);
customLoaderDialog.show(isCancelable);
customLoaderDialog.dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
// finish();
}
});
}
if (mMethodType.trim().equalsIgnoreCase("GET"))
reqType = com.android.volley.Request.Method.GET;
else if (mMethodType.trim().equalsIgnoreCase("POST"))
reqType = com.android.volley.Request.Method.POST;
if (RequestURL.equals(""))
RequestURL = Constant.BASE_URL;
else
RequestURL = URL;
if (Constant.d) Log.d("reqType", reqType + "");
jsObjRequest = new StringRequest(reqType, RequestURL, new com.android.volley.Response.Listener<String>() {
#Override
public void onResponse(String response) {
if (Constant.d) Log.d("response==>" + mMethodname, "" + response);
if (customLoaderDialog != null) {
try {
customLoaderDialog.hide();
} catch (Exception e) {
e.printStackTrace();
}
}
if (response == null || response.length() == 0) {
IVolleyRespose iVolleyRespose = (IVolleyRespose) aActivity;
iVolleyRespose.onVolleyResponse(404, response, mMethodname);
} else {
JSONObject json_str;
try {
json_str = new JSONObject(response);
int status = json_str.getInt("status");
if (status == 100) {
AlertDialog alertDialog = new AlertDialog.Builder(aActivity).create();
alertDialog.setTitle(getResources().getString(R.string.app_name));
alertDialog.setMessage(json_str.getString("message") + "");
alertDialog.setCancelable(false);
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
try {
Intent viewIntent =
new Intent("android.intent.action.VIEW",
Uri.parse(Constant.playStoreUrl));
startActivity(viewIntent);
}catch(Exception e) {
Toast.makeText(getApplicationContext(),"Unable to Connect Try Again...",
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
dialog.dismiss();
// return;
}
});
alertDialog.show();
} else {
IVolleyRespose iVolleyRespose = (IVolleyRespose) aActivity;
iVolleyRespose.onVolleyResponse(RESPONSE_OK, response, mMethodname);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}, new com.android.volley.Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError arg0) {
// TODO Auto-generated method stub
IVolleyRespose iVolleyError = (IVolleyRespose) aActivity;
iVolleyError.onVolleyError(404, "Error", mMethodname);
if (customLoaderDialog != null) {
customLoaderDialog.hide();
}
}
}) {
#Override
protected Map<String, String> getParams() {
String strRequest = "";
try {
strRequest = getWebservicejsObjRequestforvolley(mMethodname, mMap);
if (Constant.d) Log.d("Request==>", strRequest + "");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Map<String, String> params = new HashMap<>();
params.put("json", strRequest);
return params;
}
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Content-Type", "application/x-www-form-urlencoded");
return params;
}
};
//if(Constant.d) Log.d("Request==>", jsObjRequest+"");
jsObjRequest.setTag(mMethodname);
jsObjRequest.setShouldCache(shouldCache);
jsObjRequest.setRetryPolicy(new DefaultRetryPolicy(initialTimeoutMs, maxNumRetries, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
queue.add(jsObjRequest);
}
}
Please observe that here we make one interface for getting response and error.
Using Interface you can get method name on both response and error so you can identify which web api is successfully called and which give error. You should extend base class to Activity and also implement Interface which you made for getting volley response. Here in above code I show how to bind interface to activity. when you call api by passing activity context.

Android: how return a value from JsonObjectRequest?

Let's say I have this Dashboard.java:
public class DashboardActivity extends ActionBarActivity {
private TextView login_response;
private static String TAG = DashboardActivity.class.getSimpleName();
final static String API_URL_ACCOUNT = "http://www.example.com/apiv2/account";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
login_response = (TextView) findViewById(R.id.login_response);
Intent intent = getIntent();
if(intent.hasExtra("TOKEN"))
{
String token = intent.getStringExtra("TOKEN");
getShopName(token);
}
else
{
}
And this is the getShopName method:
private void getShopName(String token) {
JsonObjectRequest req = new JsonObjectRequest(API_URL_ACCOUNT + "?token=" + token, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
VolleyLog.v("Response:%n %s", response.toString(4));
JSONArray account = response.getJSONArray("account");
//Log.d(TAG, "Account: "+account.toString());
JSONObject shop = account.getJSONObject(0);
String name_shop = shop.getString("name_shop");
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.e("Error: ", error.getMessage());
}
});
// add the request object to the queue to be executed
VolleyController.getInstance().addToRequestQueue(req);
}
My goal is to have
if(intent.hasExtra("TOKEN"))
{
String token = intent.getStringExtra("TOKEN");
String shop_name = getShopName(token);
}
The "shop_name" in variable, to reuse in other part.
So, I know that void doesn't return nothing, but, I tried to edit like this answer, without success:
How can I return value from function onResponse of Volley?
Thank you

The issue is not returning a value from a JsonObjectRequest, but rather that you're trying to do an asynchronous operation in a synchronous way.
Here is a great explanation: Asynchronous vs synchronous execution, what does it really mean?
And to your specific question: I advise using an AsyncTask for your network operation.

Android AsyncTask json return value

I have called an async task from my button click.In the doInBackground I have called an API and It is returning me a Json object.I want to pass the Json object to another activity on the button click.How can I can get the return Json object value so that I can send it to other activity.
Thanks.

Create Interface
public interface Listener {
void success(BaseModel baseModel);
void fail(String message);
}
Create Base model class
public class BaseModel implements Serializable {
private static final long serialVersionUID = 1L;
}
Call below method inside your onClick mehtod.
protected void userLoginData(final String userName) {
// if you want to pass multiple data to server like string or json you can pass in this constructor
UserLoginLoader userLoginLoader = new UserLoginLoader(LoginActivity.this, userName, "1234567899", new Listener() {
#Override
public void success(BaseModel baseModel) {
// here you got response in object you can use in your activity
UserLoginModel userLoginModel = (UserLoginModel) baseModel;
// you can get data from user login model
}catch(Exception exception){
exception.printStackTrace();
Utils.showAlertDialog(LoginActivity.this, "Server is not responding! Try Later.");
}
}
#Override
public void fail(String message) {
}
});
userLoginLoader.execute();
}
:- User Login Loader class
public class UserLoginLoader extends AsyncTask<String, Void, Boolean> {
private Dialog dialog;
private Listener listner;
private String deviceId;
Activity activity;
String message;
String userName;
boolean checkLoginStatus;
public UserLoginLoader(Activity activity,String userName, String deviceId, Listener listener) {
this.listner = listener;
this.userName =userName;
this.activity = activity;
this.deviceId = deviceId;
}
#Override
protected Boolean doInBackground(String... arg0) {
//User login web service is only for making connection to your API return data into message string
message = new UserLoginWebService().getUserId(userName, deviceId);
if (message != "null" && !message.equals("false")) {
return true;
}
return false;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new Dialog(activity, R.style.CustomDialogTheme);
dialog.setContentView(R.layout.progress);
dialog.setCancelable(false);
dialog.show();
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
BaseModel baseModel = null;
if (!message.equals("null") && (!message.equals("false")) )
baseModel = parseData(message, result);
if (dialog.isShowing()) {
dialog.dismiss();
dialog.cancel();
dialog = null;
}
if (listner != null) {
if (result && baseModel != null)
listner.success(baseModel);
else
listner.fail("Server not responding! Try agian.");
} else
listner.fail("Server not responding! Try agian.");
}
//call parser for parsing data return data from the parser
private BaseModel parseData(String responseData, Boolean success) {
if (success == true && responseData != null
&& responseData.length() != 0) {
UserLoginParser loginParser = new UserLoginParser(responseData);
loginParser.parse();
return loginParser.getResult();
}
return null;
}
}
This is you Login parser class
public class UserLoginParser {
JSONObject jsonObject;
UserLoginModel userLoginModel;
/*stored data into json object*/
public UserLoginParser(String data) {
try {
jsonObject = new JSONObject(data);
} catch (JSONException e) {
Log.d("TAG MSG", e.getMessage());
e.printStackTrace();
}
}
public void parse() {
userLoginModel = new UserLoginModel();
try {
if (jsonObject != null) {
userLoginModel.setUser_name(jsonObject.getString("user_name")== null ? "": jsonObject.getString("user_name"));
userLoginModel.setUser_id(jsonObject.getString("user_id") == null ? "" : jsonObject.getString("user_id"));
userLoginModel.setFlag_type(jsonObject.getString("flag_type") == null ? "" : jsonObject.getString("flag_type"));
} else {
return;
}
} catch (Exception exception) {
exception.printStackTrace();
}
}
/*return ship name list which is stored into model */
public UserLoginModel getResult() {
return userLoginModel;
}
}

Write a callback method in the Activity that takes in the argument that you wish to pass from AsyncTask to that Activity. Send reference to the Activity to AysncTask while creating it. From doInBackground() method make a call to this callback method with the data your API returns.
Code would be something like -
public class TestAsyncTask extends AsyncTask<Integer, Integer, String[]> {
Activity myActivity;
public TestAsyncTask(Activity activity) {
this.myActivity = activity;
}
#Override
protected String[] doInBackground(Integer... params) {
String data = yourApi();
myActivity.callback(data);
}
}
public class MyActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
new TestAsyncTask(this).execute(someId);
}
public void callback(String data) {
//process data
}
}
Just for the record you can directly get return value from doInBackground() method by calling get() on it.
String data = new TestAsyncTask(this).execute(someId).get();
But note this may block your UI thread as it will wait for the doInBackground() method to complete it's execution.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Android - How to get calling Activity? - android

Related

How to fix AsyncTask params error?

Volley second request return null

Android Volley Request Identity onErrorResponse Section

Android: how return a value from JsonObjectRequest?

Android AsyncTask json return value

Categories

Resources