runOnUiThread in fragment

Question

I m trying to convert an Activity to fragment  The error mark on runOnUiThread  on the past       GoogleActivityV2 extends from Activity  runOnUiThread in class   ExecuteTask  class ExecuteTask nested on activity     Run ok  now               GoogleActivityV2 extends from Fragment  runOnUiThread in class   ExecuteTask  class ExecuteTask nested on activity     Error on   runOnUiThread    here is my code  public class GoogleActivityV2 extends SherlockMapFragment implements OnMapClickListener   OnMapLongClickListener   OnCameraChangeListener   TextWatcher          Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState           View rootView   inflater inflate R layout activity googlev2  container  false           Init            adapter   new ArrayAdapter lt String gt  getActivity    android R layout simple dropdown item 1line           textView    AutoCompleteTextView  getView   findViewById R id autoCompleteTextView1           return rootView             public void onCameraChange CameraPosition arg0              TODO Auto-generated method stub            public void onMapLongClick LatLng arg0           llLoc   arg0          stCommand    onTouchEvent           lp   new ExecuteTask            lp execute               public void onMapClick LatLng arg0              TODO Auto-generated method stub            class ExecuteTask extends AsyncTask lt String  String  String gt             Override         protected void onPreExecute                super onPreExecute                if stCommand compareTo  AutoCompleteTextView      0                    pDialog   new ProgressDialog getActivity                     pDialog setMessage Html fromHtml   lt b gt Search lt  b gt  lt br  gt Loading                         pDialog setIndeterminate false                   pDialog setCancelable false                   pDialog show                                     protected String doInBackground String     args               do something             return null                      Override         protected void onPostExecute String file url               if stCommand compareTo  AutoCompleteTextView      0  pDialog dismiss                runOnUiThread new Runnable                     public void run                        do something                                                       public void afterTextChanged Editable s              TODO Auto-generated method stub            public void beforeTextChanged CharSequence s  int start  int count  int after              TODO Auto-generated method stub            public void onTextChanged CharSequence s  int start  int before  int count              TODO Auto-generated method stub           the error says    how can I fix this error

User · Accepted Answer

Try this  getActivity   runOnUiThread new Runnable     It s because   1  the implicit this in your call to runOnUiThread is referring to AsyncTask  not your fragment   2  Fragment doesn t have runOnUiThread   However  Activity does   Note that Activity just executes the Runnable if you re already on the main thread  otherwise it uses a Handler  You can implement a Handler in your fragment if you don t want to worry about the context of this  it s actually very easy      A class instance private Handler mHandler   new Handler Looper getMainLooper         anywhere else in your code mHandler post  lt your runnable gt         this will always be run on the next run loop on the main thread    EDIT   rciovati is right  you are in onPostExecute  that s already on the main thread

User · Answer

Use a Kotlin extension function  fun Fragment  runOnUiThread action     - gt  Unit        this    return     if   isAdded  return    Fragment not attached to an Activity     activity  runOnUiThread action      Then  in any Fragment you can just call runOnUiThread  This keeps calls consistent across activities and fragments   runOnUiThread          Call your code here        NOTE  If Fragment is no longer attached to an Activity  callback will not be called and no exception will be thrown   If you want to access this style from anywhere  you can add a common object and import the method   object ThreadUtil       private val handler   Handler Looper getMainLooper         fun runOnUiThread action     - gt  Unit            if  Looper myLooper      Looper getMainLooper                  handler post action            else               action invoke

User · Answer

In Xamarin Android  For Fragment   this Activity RunOnUiThread      gt    yourtextbox Text  Hello         For Activity   RunOnUiThread      gt    yourtextbox Text  Hello         Happy coding  -

User · Answer

You can also post runnable using the view from any other thread  But be sure that the view is not null    tView post new Runnable                          Override                     public void run                             tView setText  Success                                                According to the Documentation    boolean post  Runnable action  Causes the Runnable to be added to the message queue  The runnable will be run on the user interface thread

User · Answer

I used this for getting Date and Time in a fragment   private Handler mHandler   new Handler Looper getMainLooper      Override public View onCreateView LayoutInflater inflater  ViewGroup container                           Bundle savedInstanceState            Inflate the layout for this fragment     View root   inflater inflate R layout fragment head screen  container  false        dateTextView    root findViewById R id dateView       hourTv   root findViewById R id hourView            Thread thread   new Thread              Override         public void run                 try                   while   isInterrupted                          Thread sleep 1000                       mHandler post new Runnable                              Override                         public void run                                   Calendario para obtener fecha  amp  hora                             Date currentTime   Calendar getInstance   getTime                                SimpleDateFormat date sdf   new SimpleDateFormat  dd MM yyyy                                SimpleDateFormat hour sdf   new SimpleDateFormat  HH mm a                                 String currentDate   date sdf format currentTime                               String currentHour   hour sdf format currentTime                                dateTextView setText currentDate                               hourTv setText currentHour                                                                                     catch  InterruptedException e                    Log v  InterruptedException   e getMessage

User · Answer

For Kotlin on fragment just do this activity  runOnUiThread Runnable             on main thread

[android] runOnUiThread in fragment

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