Develop Reference

AutocompleteTextView text clear if entered value is not found from list

I have a dynamic arraylist that contains String values. I want to match one of its values with AutocompleteText whatever the user has typed/entered. In case the value is not matching with any of the Arraylist values I would like to clear Autocomplete Text.
Couple of Ways I have tried.
Match the typed or user selected value from autocomplete text with list directly without any loop using "contains" method. Didn't achieve the expected result.
Store the values in String[] array from list and loop through it and match it with user input/selection from Autocompletetext. Didn't achieve the result this way too.
Please provide any ideas on how to clear text from autocompletetextview if value is not found?

You did not specify any language that's why i will answer in kotlin
Override onKeyDown method and let's say you will check when enter pressed check if given keycode value equals to KeyEvent.KEYCODE_ENTER
In if block get your text and use an algorithm like below
val arr = intArrayOf(1,2,3) if (textFromTextView !in arr) it means your typed text not in your array and if this condition is true
use autoCompleteTextView.replaceText("") and i hope it will work for you.I never tried but i searched for you.

ANDROID - textview find lineindex with string ; search in textview by linenumber

i know highlighting in text-view is possible
Highlight Textview Using EditText
and scrolling text-view is also possible
(got the scroll code from here and is successfully scrolling too)
textView scroll at first line
now the question is, i am searching and i want to highlight that text and navigate to it, when someone presses the search button, the highlighting part is perfect, now i can get the index of the word in the string, but not line number of the string in the text-view,
point is if i want to find a position of certain text in text-view, i.e. which line number is that on, how to do it ?
i found an answer for this, but later i realized its for iOS
Search occurrences of a string in a TextView

Correct if I am wrong, you want to know the position where a particular text is in a String? If so then you can do it by using the following
String text = "0123hello9012hello8901hello7890";
String word = "hello";
Log.d("startOfWordPosition",text.indexOf(word)); // prints "4"
Log.d("endOfWordPosition",text.lastIndexOf(word)); // prints "22"
As you see that it will tell you the position as to where the word is located but you have to think about case where a word may come more than once. If you are sure that word will occur only once then above code is perfect for you. If not, then you will have to somehow tackle the problem.

This is working for loading a file into a textview so that the user's last selection or cursor position is at the top of the screen.
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
page.setSelection(pos, pos2);
Layout layout = page.getLayout();
scroll.scrollTo(0, layout.getLineTop(layout.getLineForOffset(pos2))); }
}, 500);
page is a TextView, pos and pos2 are ints and the two ends of the last selection by the user (they are the same int if it's just the cursor), scroll is a scrollview containing the textview. It is all in a Handler because of delay issues internal to Android's loading all these objects. Th filename, pos and pos2 are saved as settings on exit.

Android find Text Group and Highlight in ListView

I am performing a search over Strings in an ArrayList. If the Term is found I need to highlight that term and return the a string with the word where the term is present plus a word before and after that word!
Example:
Term = “some”
Searched String = “This is my awesome test String!”
Result = “my awesome test” (“some” should be highlighted here)
First off I am useless with RegEx and wouldn’t know where to start and secondly I’m not sure how to highlight text in a ListView, there are 3 TextViews per Row and I pass an Array with Data objects to the Adapter. Can I just give the Data Object Spanndable’s for highlighting?!

After some trial and error and some help i got this which seems to do the trick
(^|\S*\s)\S*term\S*($|\s\S*)

Dynamic Variable Names for Android App

I have an activity with 4 TextView elements with ids of Mon1, Mon2, Mon3, Mon4.
Is it possible to create a loop in the MainActivity.java code where I can perform, for example, a setText action on each of the 4 ids without having to list them out one-by-one.
ie. Mon*X*.setText=""; (where X is a value from 1 to 4).
I guess to take this one step further, if the ids were actually Mon1, Mon2, Mon3, Mon4, Tue1, Tue2, Tue3, Tue4, Wed1 .........Sun1, Sun2,Sun3, Sun4. Could a loop be created to not only change the number 1..4 but also use an array for the Mon, Tue, Wed etc.
The end result being some sort of loop that can do setText on ALL the ids that I need rather than 28 individual setText commands.

You could do something like:
TextView Mon1; //and do whatever with it
TextView Mon2; //And so on
TextView[] tv = {Mon1, Mon2, Mon3, /*etc*/}
int i = 0;
void doSomething(){while(i<=/*number of TextViews*/){tv[i].setText("BLAH");i++;}}
I hope this helped :D

Is it possible to create a loop in the MainActivity.java code where I
can perform, for example, a setText action on each of the 4 ids
without having to list them out one-by-one.
Yup. Use an array.
To take it another step further, use another array. It's what they're made for.
(By array, I mean an ArrayList, HashMap, dictionary, array, or any other data structure like that).

Display a List in TextView

I'm making a fake command-line system for a fun app, and I want to show the input and output in the same TextView, like this:
>something
>something else
>even more stuff
>etcetera.
I already figured out how to store the text from the EditText into a string and add \n and >, but I can't use strings for the whole thing: to avoid clogging up RAM, I'd like to delete lines after, say 50? I figured that would be much easier to do using Lists.
However, this doesn't work:
log.setText((CharSequence) logText);
But what will?

This method :
http://developer.android.com/reference/android/text/TextUtils.html#join(java.lang.CharSequence, java.lang.Iterable)
return a string composed of each element (either cast as a string or the toString value is used) separated by the delimiter in between each element. You can therefore easily concat all your items in one String.
You can also use http://developer.android.com/reference/java/util/AbstractList.html#subList(int, int)
to limit the count of items in said list.
From your question I assume logText is a List of some sort, therefore you can call
log.setText(TextUtils.join("\n>", logText.subList(0, 50));

Maybe you can put all your strings in a list, an each time you add one, recreate a single string from the list which contains all your items, and affect it to your textview.

You could use a ListView without a separator and populate it using an ArrayAdapter.
That way you wouldn't have to worry about memory, and the user could easily scroll through previous commands.