Develop Reference

My application skips AsyncTask.execute() and crashes

here is my onCreate method the problem is that the app shows the toast "Finish ! " but it dosen't execute li.execute(Email,Password); and it crashes. that's it
I want the app to do what's inside li.execute(Email,Password); first.
PS : loginBackgroundWorker is a class that extends AsyncTask<String,String,String> and it has onPreExecute() and doInBackground() and onPostExecute() methods.
The app dosen't show any errors or warnings but it crashes in the emulator.
here is the code :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
li = new loginBackgroundWorker(LoginActivity.this);
//loginBackgroundWorker is a class that extends AsyncTask
EditTextEmail =(EditText) findViewById(R.id.emailField);
EditTextPassword =(EditText) findViewById(R.id.passwordField);
loginButton = (CardView) findViewById(R.id.loginButton);
loginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Email = EditTextEmail.getText().toString().trim();
Password = EditTextPassword.getText().toString().trim();
li.execute(Email,Password);
Toast.makeText(LoginActivity.this,"Finish !",Toast.LENGTH_LONG).show();
}
});
}
here is AsyncTask Class (I don't think that what is inside those functions is important for you)
public class loginBackgroundWorker extends AsyncTask<String,String,String> {
Context context;
public String email;
public String password;
public static final String login_url="http://192.168.0.104/login.php";
public loginBackgroundWorker(Context context) {
this.context = context;
}
#Override
public void onPreExecute() {
//Toast.makeText(context,"preExecute",Toast.LENGTH_LONG).show();
}
#Override
public String doInBackground(String... params) {
try {
email = params[0];
password = params[1];
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String result="";
String line="";
while((line = bufferedReader.readLine())!= null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
public void onPostExecute(String result) {
Toast.makeText(context,"Onpost",Toast.LENGTH_LONG).show();
String r=result.trim();
Boolean aBoolean = true;
if (result.equals("1"))
{
Toast.makeText(context,"Bien Connecté",Toast.LENGTH_LONG).show();
aBoolean = false;
}
else if (result.equals(""))
r = "Login ou mot de passe incorrect";
if (aBoolean)
{
Toast.makeText(context,r,Toast.LENGTH_LONG).show();
}
}
}
here is the StackTrace
--------- beginning of crash
05-26 14:56:24.023 14756-14756/com.example.zaariou.blacklist E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.zaariou.blacklist, PID: 14756
java.lang.IllegalStateException: Cannot execute task: the task is already running.
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:593)
at android.os.AsyncTask.execute(AsyncTask.java:551)
at com.example.zaariou.blacklist.LoginActivity$1.onClick(LoginActivity.java:58)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Instance of AsyncTask can only run once.
If you want to reuse your AsyncTask you must initialize new instance of your loginBackgroundWorker and run it.
Move your loginBackgroundWorker initialization to your OnClickListener.onClick handle

Can we use two Interface for two different asynctask

AsyncResponse.java:
public interface AsyncResponse {
void ProcessFinish(String Output);
}
AsyncResponseSecond.java:
public interface AsyncResponseSecond {
void ProcessFinishSecond(String Output);
}
This is for Asynctask OnPostExecute to get the result and save it in TextView.
I want to Know if the method which I am Using is correct or not . I am not getting the response
Asyncresponse is for one button and AsyncresponseSecond is for other Button
IntimeWorker.java:
public class InTImeWorker extends AsyncTask<String, Void, String> {
Context context;
AlertDialog alertDialog;
public AsyncResponse delegate = null;
InTImeWorker(Context ctx) {
context = ctx;
}
#Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("In Time Status !");
}
#Override
protected void onPostExecute(String result) {
delegate.ProcessFinish(result);
}
#Override
protected String doInBackground(String... params) {
String Emp_id = params[0];
String in_time_url = "http://192.168.0.107/RTOS/intime.php";
try {
URL url = new URL(in_time_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("emp_id", "UTF-8") + "=" + URLEncoder.encode(Emp_id, "UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
OuttimeWorker.java:
public class OutTimeWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
public AsyncResponseSecond delegate = null;
OutTimeWorker(Context ctx){
context = ctx;
}
#Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Out Time Status !");
}
#Override
protected void onPostExecute(String result) {
delegate.ProcessFinishSecond(result);
}
#Override
protected String doInBackground(String... params) {
String Emp_id = params[0];
String out_time_url = "http://192.168.0.107/RTOS/outtime.php";
try {
URL url = new URL(out_time_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("emp_id","UTF-8")+"="+URLEncoder.encode(Emp_id,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine())!= null){
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
EmployeeActivity.java:
public class EmployeeActivity extends AppCompatActivity implements AsyncResponse , AsyncResponseSecond {
TextView name, In_time, Out_time;
SharedPreferences sp,sp1;
Button in_time_button, out_time_button;
private static final String KEY_IN_TIME_TEXTVIEW = "intimetextview_key";
private static final String KEY_OUT_TIME_TEXTVIEW = "outtimetextview_key";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_employee);
name = findViewById(R.id.text_name);
sp = getSharedPreferences("attendlogin", MODE_PRIVATE);
String emp_name = sp.getString("name", null);
name.setText(emp_name);
in_time_button = findViewById(R.id.buttonlogin);
out_time_button = findViewById(R.id.buttonlogout);
out_time_button.setEnabled(false);
In_time = findViewById(R.id.text_in_time);
Out_time = findViewById(R.id.text_out_time);
public void OnAttendLogin(View view) {
sp = getSharedPreferences("attendlogin", MODE_PRIVATE);
String emp_id = sp.getString("emp_id", null);
InTImeWorker inTImeWorker = new InTImeWorker(this);
inTImeWorker.delegate = (AsyncResponse) this;
inTImeWorker.execute(emp_id);
//shared pref for saving In_time in textview
sp1 = getSharedPreferences("InTime", MODE_PRIVATE);
SharedPreferences.Editor editor1 = sp1.edit();
String in_time_sharedpref = In_time.getText().toString();
editor1.putString("in_time_sp", in_time_sharedpref);
editor1.apply();
editor1.commit();
out_time_button.setEnabled(true);
in_time_button.setEnabled(false);
}
public void OnLogout(View view) {
sp = getSharedPreferences("attendlogin", MODE_PRIVATE);
String emp_id = sp.getString("emp_id", null);
OutTimeWorker outTimeWorker = new OutTimeWorker(this);
outTimeWorker.delegate = (AsyncResponseSecond) this;
outTimeWorker.execute(emp_id);
out_time_button.setEnabled(false);
in_time_button.setEnabled(false);
}
#Override
public void ProcessFinish(String Output) {
In_time.setText(Output);
}
#Override
public void ProcessFinishSecond(String Output) {
Out_time.setText(Output);
}}

Do it like this
CallAPI asyncTask = new CallAPI(getContext());
CallAPI asyncTask2 = new CallAPI(getContext());
final chat text = this;
sendb.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
String data = null;
//data to send
CallAPI asyncTask = new CallAPI(getContext());
asyncTask.delegate = text;
asyncTask.execute("", data, "sendMsg");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
sendb2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
String data = null;
//data to send
CallAPI asyncTask2 = new CallAPI(getContext());
asyncTask2.delegate = text;
asyncTask2.execute("", data, "sendMsg");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
});
#Override
public void onTaskCompleted(String output, String output2) {
}

AsyncTask not create GridView using BaseAdpter

Im new to android development have very basic knowledge of this whatever i have achieved till now is achieved using this website or youtube videos i'm stuck in AsyncTask (Earlier i was using .get() on Create View and it was working fine but UI Was blocked until task is finished. To Avoid UI Blocking i was advice to remove .get() function from OnCreateView() function now after removing this im not being able to get any data from AsyncTask). I did that but now i'm not being able to create view i did lots of research but unable to get this strength
Here is my Codes Please Help how to create view from this
OnCreateView() :-
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View GView = inflater.inflate(R.layout.fragment_dashboard, container, false);
progressBarHolder = (FrameLayout) GView.findViewById(R.id.progressBarHolder);
GridView gridView = (GridView) GView.findViewById(R.id.gridView);
//Toast.makeText(getActivity(),Json_String,Toast.LENGTH_LONG).show();
String finalResult = null;
try{
finalResult = String.valueOf(new JSONTask().execute("https://www.example.in/android_api/dashboard_data",JsonData()));
Toast.makeText(getActivity(),Json_String,Toast.LENGTH_LONG).show();
JSONObject parentObject = null;
parentObject = new JSONObject(finalResult);
if(((String) parentObject.names().get(0)).matches("error")){
JSONObject jObj = parentObject.getJSONObject("error");
errorThrow(jObj.getString("Description"));
} else if(((String) parentObject.names().get(0)).matches("success")){
JSONObject jObj = parentObject.getJSONObject("success");
JSONArray arrajson = jObj.getJSONArray("data");
String arrayCount = Integer.toString(arrajson.length());
String[] type = new String[arrajson.length()];
Integer[] count = new Integer[arrajson.length()];
for (int i=0; i<arrajson.length();i++){
JSONObject jsonObject = arrajson.getJSONObject(i);
type[i] = jsonObject.getString("type");
count[i] = jsonObject.getInt("count");
}
CustomAdpter customAdpter = new CustomAdpter(DashboardFragment.this,type,count);
gridView.setAdapter(customAdpter);
return GView;
}
} catch (JSONException e) {
e.printStackTrace();
}
return GView;
}
Base Adapter Code :-
class CustomAdpter extends BaseAdapter {
String[] type;
Integer[] count;
public CustomAdpter(DashboardFragment dashboardFragment, String[] type, Integer[] count){
this.count = count;
this.type = type;
}
#Override
public int getCount() {
return type.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = getLayoutInflater().inflate(R.layout.grid_single_itme,null);
TextView textView = (TextView) view.findViewById(R.id.TextView1);
TextView textView1 = (TextView) view.findViewById(R.id.textView2);
textView.setText(String.valueOf(count[i]));
textView1.setText(type[i]);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getActivity(),"Booking Item Clicked",Toast.LENGTH_LONG).show();
}
});
return view;
}
}
AsyncTask Code :-
public class JSONTask extends AsyncTask<String,String,String> {
private ProgressDialog mProgressDialog;
int progress;
public JSONTask(){
mProgressDialog = new ProgressDialog(getContext());
mProgressDialog.setMax(100);
mProgressDialog.setProgress(0);
}
#Override
protected void onPreExecute(){
mProgressDialog = ProgressDialog.show(getContext(),"Loading","Loading Data...",true,false);
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
final String finalJson = params[1];
String json = finalJson;
try{
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(5000);
connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
connection.setRequestProperty("A-APK-API", "******");
connection.setRequestProperty("Authorization", "Basic **:**");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.connect();
OutputStream stream = connection.getOutputStream();
OutputStreamWriter streams = new OutputStreamWriter(stream, "UTF-8");
stream.write(json.getBytes("UTF-8"));
stream.close();
reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
StringBuffer buffer = new StringBuffer();
String line = "";
while((line = reader.readLine()) != null){
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(connection != null){
connection.disconnect();
}
try {
if(reader != null) {
reader.close();
}
} catch (IOException e){
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(String result){
super.onPostExecute(result);
Json_String = result;
Toast.makeText(getContext(),result,Toast.LENGTH_LONG).show();
mProgressDialog.dismiss();
}
}
Please help me here

You cannot get a result from asynctask when you dont use .get().
So change that statement. Start only the asynctask.
Then put all the code after that line in onPostExecute() of the AsyncTask.
Thats all.

you should change way you are creating the Adapter and attaching
you should do this
1.At first get the data in List,ArrayList etc. via AsyncTask, doInBackGround method
then on the onPostExecute method retrieve the data and create Adapter and attach it to your View
While you are getting data you can show some ProgressDialog.
If your AsyncTask is in other separate class then use interface to get the data from your AsyncTask class
look at this https://stackoverflow.com/a/47373959/8197737

Returning result from Asynctask

If I have this background worker file in my android application and it gets data from my database how can I pass the string 'result' to another class?
The background worker connects to my server and then using php it connects to a database.
public class BackgroundWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
BackgroundWorker (Context ctx) {
context = ctx;
}
#Override
public String doInBackground(String... params) {
String type = params[0];
String specials_url = "";
if(type.equals("venue click")) {
try {
//String user_name = params[1];
URL url = new URL(specials_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
// String post_data = URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode(user_name,"UTF-8");
// bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String result="";
String line="";
while((line = bufferedReader.readLine())!= null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Info");
}
#Override
protected void onPostExecute(String result) {
alertDialog.setMessage(result);
alertDialog.show();
// String temp = "login success";
// if (result.equals(temp)) {
// Intent intent = new Intent(context, Register.class);
// context.startActivity(intent);
// }
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}

You need a listener. This will allow you to notify back when the AsyncTask is done.
Define the listener by creating an interface, like this:
public interface IListener
{
void onCompletedTask(String result);
}
On the task store a reference to the listener.
private IListener mListener;
// Pass the reference to the constructor.
public BackgroundWorker(IListener listener)
{
mListener = listener;
}
Then you notify the listener like this.
#Override
protected void onPostExecute(String result)
{
mListener.onCompletedTask(result);
}

Best way to get a callback from background thread is to use interfaces as a callback from AsyncTask for example:
create an interface that can be called in onPostExecute()
public interface ResponseCallback {
void onRespond(String result);
}
and before calling asynckTask define it like this:
ResponseCallback cpk = new ResponseCallback() {
#Override
public void onRespond(String result) {
//code to be done after calling it from onPostExecute
}
};
and pass cpk to the constructor of of the asynckTask and call it in onPostExecute like that:
if(cpk!=null){
cpk.onRespond(result);
}
of course you can modify the signature of the interface to what ever you want.

Android adds blank rows to db

I am trying to insert inputs to database but whenever I try, it adds empty rows to it. I have created an html form that works perfectly. Here is my code I would appreciate any help.
MyFragment.java
public class MyFragment extends Fragment{
EditText senderEt, headerEt, textEt;
Button btn;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.my_fragment, container, false);
senderEt = (EditText)rootView.findViewById(R.id.sender);
headerEt = (EditText)rootView.findViewById(R.id.header);
textEt = (EditText)rootView.findViewById(R.id.text);
btn = (Button) rootView.findViewById(R.id.btnSend);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addToDB(getView());
}
});
return rootView;
}
public void addToDB(View view){
String sender= senderEt.getText().toString();
String header= headerEt.getText().toString();
String text= textEt.getText().toString();
BackgroundTask backgroundTask = new BackgroundTask(getActivity());
backgroundTask.execute(sender, header, text);
}
}
BackgroundTask.java
public class BackgroundTask extends AsyncTask<String, Void, String> {
Context context;
BackgroundTask(Context context){
this.context=context;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
String add_url= "http://139.179.196.153:8080/addDB.php";
String sender = params[0];
String header = params[1];
String text = params[2];
try {
URL url = new URL(add_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String data = URLEncoder.encode("sender", "UTF-8") + " = "+URLEncoder.encode(sender, "UTF-8")+"&"+
URLEncoder.encode("header", "UTF-8") + " = "+URLEncoder.encode(header, "UTF-8")+"&"+
URLEncoder.encode("text", "UTF-8") + " = "+URLEncoder.encode(text, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inpInputStream = httpURLConnection.getInputStream();
inpInputStream.close();
return "Add to DB Success";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
#Override
protected void onPostExecute(String res) {
Toast.makeText(context, res, Toast.LENGTH_SHORT).show();
}
}
After I debugged, I got "data" variable in "BackgroundTask" as
sender = fggff&header = kkkjjj&text = qwwqwq
do they have to be in quotes? or are the blanks problem?
php code
<?php
$db_name = "test";
$db_user = "root";
$db_password = "";
$db_server_name = "localhost";
$con = new mysqli($db_server_name, $db_user, $db_password, $db_name);
if($con->connect_error){
echo "Connection error".mysqli_connect_error();
}
else{
echo "<h3>Database connection success</h3>";
}
$sender = $_POST["sender"];
$header = $_POST["header"];
$text = $_POST["text"];
$sql_query = "insert into things values('$sender','$header','$text')";
if(mysqli_query($con, $sql_query)){
echo "<h3>Data insertion success</h3>";
}
else{
echo "<Data insertion error</h3>".mysqli_error($con);
}

Keep in mind that your background task will not do the inserts immediately when called. I think you are passing reference parameters (that is not scalars) and so the caller could be changing them before the background task has a chance to use them.
Two choices: don't do in background - for a local db, a single insert is really fast and can usually be done on the UI thread.
Or, make copies of the strings before you send them to the background task.