Develop Reference

Kotlin - Clear Button listener for google's Place Autocomplete API onClick not called

I'm trying to create a listener for the clear button that comes from google's Place Autocomplete API. i called my clearButton() method in my fragment's onViewCreated method
clearButton()
placeAutocompleteFragment?.view?.findViewById<View>(R.id.place_autocomplete_clear_button)
?.setOnClickListener {
View.OnClickListener {
Log.d(TAG, "Cleared")
it?.findViewById<EditText>(R.id.place_autocomplete_search_input)?.setText("")
it?.visibility = View.GONE
}
}
now when i click on the clear button icon, the text doesn't get erased, nothing happens. I can still type in a new location though, but i can't clear it. my Log.d isn't getting displayed either.

I don't have android studio on this machine now to try, but I guess you can do something like
place_autocomplete_clear_button.onClick { place_autocomplete_search_input.text = "" }
where place_autocomplete_clear_button can be static import and onClick might be from anko

Figured it out. I had the method calls set up all wrong.
Here's how it should look like:
private fun clearButton() {
placeAutocompleteFragment?.view?.findViewById<View>(R.id.place_autocomplete_clear_button)?.setOnClickListener {
Log.d(TAG, "Cleared Button Clicked")
it.visibility = View.GONE
//do something
}
}

Get an event triggered when text change unity?

Here the Text Area is constantly changing in terms of number and I want to trigger an event when the Text Area gets a particular number example I have tried this -
public void myfunction45(Canvas Panel)
{
if (Indicator = 45) {
Panel.enabled = false;.
}
} //(indicator- www.progress).
But it does not work(it does not read it nothing happens). how do I match the condition as the number is to be specific. please give an example for explanation. Thanks in advance.

That if statement would cause you problems.
You would want:
if(Indicator == 5)
instead. At the moment you're assigning the value without checking it, this would cause a compiler error. If it's just a typo, then update your answer, slightly confusing otherwise.
With regards to checking the text value. You'd have to grab the text value, for that you need a reference to the Text area. This approach assumes that the text area has it's value set by a user. Currently you're not grabbing any text values to compare, as a result, the if statement won't know what to compare.
Here's one approach:
public void myfunction5(Canvas Panel)
{
float result;
string textValue = yourTextArea.text;
if(Single.TryParse(textValue, out result))
{
if(result == Indicator)
{
Panel.enabled = false;
}
}
}
You use TryParse to avoid any potential exceptions that would be thrown if the user entered something that wasn't a number. This method will take the value from your text area, how you get your text area is up to you, and try to parse the text value into a float. The method will return true if the parse was a success, false otherwise.
Here's the reference for the TryParse stuff:
https://msdn.microsoft.com/en-us/library/26sxas5t(v=vs.110).aspx
If you wanted to parse it to an int, then you'd be using the Int32's version of TryParse, https://msdn.microsoft.com/en-us/library/system.int32_methods(v=vs.110).aspx
I'd also recommend having a peak at the Input Field documentation: https://docs.unity3d.com/Manual/script-InputField.html
You can subscribe your method to the Input-fields On Value Changed event, your function will need to tweaked slightly though:
public void myfunction5(string text)
{
float result;
if(Single.TryParse(text, out result))
{
if(result == Indicator)
{
CachedPanel.enabled = false;
}
}
}
Don't forget to store a reference to the panel you want to disable.
Hopefully this is what you're after.

Panel is already a Canvas type, it doesn't make any sense to GetComponent<Canvas> on the same type.
Try using Panel.enabled = false;.
For the rest, we don't know how you get the Indicator reference, or how you built the UI hierarchy, so we can't assess if the problem is there.
Edit: I could I miss the single = baffles me lol. I should avoid answering questions when I'm tired.

How can I prevent UI thread from going on until password input is right

I am writing an Android file viewer to provided for the host app, our viewer is a fragment , and host app use newinstance to use our fragment. Some codes are as below:
newInstance () {
......
openfile();
return fragment;
}
openfile() {
......
if(ispasswordfile) {
showPasswordInputDialog;
mpassword = .;
mpagecount = ..;
......;
return errorcode;
} else {
.......
}
}
showPasswordDialog() {
......
dialog.show();
EditText edittext = dialog.findViewById(...);
edittext.addListener(){
override
public boolean action....{
.......
if(password is right) {
.....
}
}
};
My question is when dialog input password is right and then execute the sentences after showPasswordInputDialog. These codes are all running in UI thread, and listener need to change the UI if password is wrong, so I cannot pause the UI thread. So are there any ways to set a barrier between showPasswordInputDialog; and mpassword = .; And when the password is right I will remove the barrier and let the UI thread going down.
I try to use a while loop it does not work. And I cannot add actions in the listener when password is right, because I want to return the fragment by newInstance.
This has bothered me a long time, and help is appreciated!

You have to think that as an event based execution. So don't place the
mpassword = .;
below the show dialog method. Now in the text change listener, on each and every change just check whether it is the right password or not. Then if the password is correct, then dismiss the dialog and set the password
if(password is right) {
mpassword = .; //Then continue your work from here or call other method.
}
There is no need to block main thread.
Let me know if I misunderstood the question.

So are there any ways to set a barrier between showPasswordInputDialog; and mpassword = .;
No, sorry.

Put whatever work that needs to be done in if(password is right) block or use some sort of flag to know if the password is true and use it in openfile().

NotifyDataSetChanged not working on Android 2.1

I am working on an Android app which will support the Ice cream sandwich API but work on older devices such as running android 2.1.
I'm doing this by doing a check of what the current API version is, and if its post ice cream sandwich call one activity and then if its anything below, call a different activity.
I am allowing the user to perform a search, when it gets the results it then clears ArrayList and then adds the items from the search back in, and then calls the arrayadapter.notifydatasetchanged. This code I've copied and pasted from the ICS version into the pre ICS version, the ICS works fine but on the pre ics version the list view doesn't get updated. Below is the code that I have.
public void performSearch(ArrayList<Spanned> searchPasswords)
{
if (searchPasswords.size() > 0)
{
btnClearSearch.setVisibility(View.VISIBLE);
passwords.clear();
for (int i = 0; i < searchPasswords.size(); i++)
{
passwords.add(searchPasswords.get(i));
}
passwordArrayAdapter.notifyDataSetChanged();
btnClearSearch.setOnClickListener(mBtnClearSearch);
common.showToastMessage(searchPasswords.size() + " result(s) found", Toast.LENGTH_LONG);
}
else
{
common.showToastMessage("No search results found", Toast.LENGTH_LONG);
}
}
I've debugged this function so it is definetely calling it, and its displaying the toast messags with saying how many results were found, but the list view doesn't get changed.
Update
I have just made a discovery which is a bit confusing. As a test in the function that does the initial loading of the list view I manually create a new search ArrayList<Spanned> and pass this to the same PerformSearch(ArrayList<Spanned>) that I am having the problem with and this works without any problems.
The problem with the performSearch not updating the ListView only seems to happen when it is being called from onActivityResult. I know that onActivityResult is working fine as when the performSearch function is called it then prints out there is 1 result(s) found so its definitely got data just the list view doesn't get refreshed from the onActivityResult calling the performSearch function.

You can try:
passwordArrayAdapter = new WHAT_EVER_ADAPTER_THIS_IS(searchPasswords, extra_constructor_params);
YOUR_LIST_VIEW.setAdapter(passwordArrayAdapter)
instead of:
passwordArrayAdapter.notifyDataSetChanged();

I had a similar issue. Neither notidfyDataSetChanged() nor setAdapter() worked.
Finally I figured out a solution which may not be as efficient as using notifyDataSetChanged() but it works.
/**
* Updates courses' list adapter.
*/
private void updateListAdapter()
{
final ArrayAdapter a = (ArrayAdapter) coursesList.getAdapter();
runOnUiThread(new Runnable()
{
public void run()
{
populteCoursesList();
a.clear();
for (MainScreenListModel model : listModels)
{
a.add(model);
}
a.notifyDataSetChanged();
}
});
}
courseList is my custom list. populateCoursesList() gets the data from db and listModels is a Vector of models for list view.
As you can see I have to clear the adapter and fill it once again.

I think your mistake is to forget to clear the adapter, if you try it like this it should work:
public void performSearch(ArrayList<Spanned> searchPasswords)
{
if (searchPasswords.size() > 0)
{
btnClearSearch.setVisibility(View.VISIBLE);
passwordArrayAdapter.clear();
for (int i = 0; i < searchPasswords.size(); i++)
{
passwordArrayAdapter.add(searchPasswords.get(i));
}
passwordArrayAdapter.notifyDataSetChanged();
btnClearSearch.setOnClickListener(mBtnClearSearch);
common.showToastMessage(searchPasswords.size() + " result(s) found", Toast.LENGTH_LONG);
}
else
{
common.showToastMessage("No search results found", Toast.LENGTH_LONG);
}
}

passwords.clear();
for (int i = 0; i < searchPasswords.size(); i++)
{
passwords.add(searchPasswords.get(i));
}
passwordArrayAdapter.notifyDataSetChanged();
As per the code, u r modifying the list(passwords), but is it the same instance that is being used by the adapter (passwordArrayAdapter). If not then notifyDataSetChanged() wont work.
From my understanding, you can either set the list again with a new instance of passwordArrayAdapter.
ur_list_view.setAdapter(new PasswordArrayAdapter(newly_formed_password_list, and other parameters));
or use getter and setter to update the list(passwords) and then call notifyDataSetChanged()

I dont know much from only the code snippet you've pasted but from what I see there is no persistent link between passwords and the passwordsArrayAdapter....passwordsArrayAdapter initialises itself with the elements of passwords and passwordsArrayAdapter will not know when passwords changes. To add new items you should call passwordsArrayAdapter.add(searchPasswords).Dont bother calling notifyDataSetChanged() explicitly.
public void performSearch(ArrayList<Spanned> searchPasswords)
{
if (searchPasswords.size() > 0)
{
btnClearSearch.setVisibility(View.VISIBLE);
passwordArrayAdapter.clear();
passwordArrayAdapter.setNotifyOnChange(true);
for (int i = 0; i < searchPasswords.size(); i++)
{
passwordArrayAdapter.add(searchPasswords.get(i));
}
btnClearSearch.setOnClickListener(mBtnClearSearch);
common.showToastMessage(searchPasswords.size() + " result(s) found", Toast.LENGTH_LONG);
}
else
{
common.showToastMessage("No search results found", Toast.LENGTH_LONG);
}
}
I wouldnt think there'd be a relation with the onActivityResult bit -- the above code should fix it.

Call notifyOnChange(false) before clearing and adding the new entries. Otherwise, the clear() and every add() internally trigger a call to notifyDataSetChanged(), which, as I experienced, confuses the ListView. Keep your explicit notifyDataSetChanged(), which also resets the internal notifyOnChange flag to true again.

Thanks everyone for your help and suggestions, I've managed to find out what the problem was.
In my OnResume method for the activity I call a function called populateListArray which retrieves all of the information from the database and lists in the ListView.
When the activity was returned it was calling the OnResume method so after it got the results it then reset the list view back with all the original content.
To get round it I added a variable called performingSearch which I initialise to false. When I perform the search I set this to true and in the onResume, if the variable is true I don't do anything and after the perform search function has finished I set the variable back to false again.
Thanks everyone again for your help

where to put checking edittext syntax?

i need a favor.. i'm confused to put these codes to check whether the edittext is empty or not:
String input = editText.getText().toString();
if(input == null || input.trim().equals("")){
Toast.makeText(context, "Sorry you did't type anything"), Toast.LENGTH_SHORT).show();
}
where must i write these codes? is it between these codes?
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menuawal);
...
...
...
JmlAhliWarisAnakLK = (EditText) findViewById(R.id.JmlAhliWarisAnakLK);
JmlAhliWarisAnakPR = (EditText)findViewById(R.id.JmlAhliWarisAnakPR);
or in this function after double sisa=0;??
public void cc() {
int JmlWarisAnakPR = Integer.parseInt(JmlAhliWarisAnakPR.getText().toString());
int JmlWarisAnakLK = Integer.parseInt(JmlAhliWarisAnakLK.getText().toString());
int JmlHarta = Integer.parseInt(JmlHartaPeninggalan.getText().toString());
double HasilSuami = 0;
double HasilIstri = 0;
double HasilAnakLK = 0;
double HasilAnakPR = 0;
double sisa = 0;
}
please correct me if i'm wrong.. :D

you are on the right track
After you set the layout using setContentView you need to add your EditText's which you are doing fine as follows.
JmlAhliWarisAnakLK = (EditText)findViewById(R.id.JmlAhliWarisAnakLK);
JmlAhliWarisAnakPR = (EditText)findViewById(R.id.JmlAhliWarisAnakPR);
You then need to store the value you get from the EditText's in some variable,
int JmlWarisAnakPR = Integer.parseInt(JmlAhliWarisAnakPR.getText().toString());
....
....
After you have stored your values you can then call some method that validates your input on click of a button(if you have):
public void validateinput()
{
if(input == null || input.trim().equals(""))
{
Toast.makeText(context, "Sorry you did't type anything"), Toast.LENGTH_SHORT).show();
}
}

According to me, you should put the check on some event, like if its login screen, then on click of submit button. or other wise on focus change it main instantly provide user with the toast that he left the field empty. or if other case, please provide more information for your query. thanks.

That depends on when you want to validate the editText..You propably have some button which "submits" the EditText so call this code in after onClick event gets fired on the button..

Put the input validation code when you have to navigate away from the current activity, either to go to another activity or to save the input details. That's the least annoying place to shove an error message onto the user.
Another approach is to validate when the focus leaves the EditText. But in this case the error notification should be more subtle (and therefore less annoying) like changing the EditText's background to lightred.

Ur questions does not seem to be clear. Are u asking where do u need to put the validation for empty edittext? If this is ur question then the general case would be to validate during any events such as BUTTON CLICK. Set the onClickListener for ur button and inside ur onclick perform the validation.

String input = editText.getText().toString();
if(input == null || input.trim().equals("")){
Toast.makeText(context, "Sorry you did't type anything"), Toast.LENGTH_SHORT).show();
}
Your above code is pretty much correct. You Must need to add above code whenever you want to take input from these edittext, Or whenever you want to save these value. make a function which will return true if edit text is empty so u can ask user to enter values
public boolean isETEmpty(){
String input = editText.getText().toString();
if(input == null || input.trim().equals("")){
Toast.makeText(context, "Sorry you did't type anything"), Toast.LENGTH_SHORT).show();
return true;
}
return false; // if not empty
}
call this function Whenever u want to use values from ET, if this function return true, you must let user enter values. Such as on Button Click to save etc