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<String>(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<String, String, String> {
@Override
protected void onPreExecute(){
super.onPreExecute();
if(stCommand.compareTo("AutoCompleteTextView") != 0) {
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage(Html.fromHtml("<b>Search</b><br/>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?
This question is related to
android
android-fragments
android-activity
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."
In Xamarin.Android
For Fragment:
this.Activity.RunOnUiThread(() => { yourtextbox.Text="Hello"; });
For Activity:
RunOnUiThread(() => { yourtextbox.Text="Hello"; });
Happy coding :-)
fun Fragment?.runOnUiThread(action: () -> 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 anActivity
, 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: () -> Unit) {
if (Looper.myLooper() != Looper.getMainLooper()) {
handler.post(action)
} else {
action.invoke()
}
}
}
For Kotlin on fragment just do this
activity?.runOnUiThread(Runnable {
//on main thread
})
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 & 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());
}
}
};
}
Source: Stackoverflow.com