Develop Reference

I have to run a function just once when after user stops typing but my function runs multiple times

I have to run a function just once when after the user stops typing but my function runs multiple times.I have detected when a user stops typing but can't execute my function just once.
#Override
public void onTextChanged(CharSequence charSequence, final int i, final
int i1, final int i2) {
Timer timer = new Timer();
//Run after user stops typing
TimerTask tt = new TimerTask() {
#Override
public void run() {
Date myRunTime = new Date();
if ((lastTypeTime.getTime() + 1000) <= myRunTime.getTime()) {
Handler h = new Handler(Looper.getMainLooper());
h.post(new Runnable() {
#Override
public void run() {
Log.i("t_type", "Type Finish");
//Issue : This is printed multiple time.
}
});
} else {
Log.i("t_cancel", "cancel");//cancel
}
}
};
timer.schedule(tt, 2000);//two second delay after user stops typing
}

I solve the issue in this way. thanks #jitesh mohite
#Override
public void afterTextChanged(Editable editable) {
Log.i("t_text", editable.toString());
if (!isTyping) {
isTyping = true;
Log.i("t_type", "Typing");
}
timer.cancel();
timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
android.os.Handler handler = new
android.os.Handler(Looper.getMainLooper());
handler.post(new Runnable() {
#Override
public void run() {
Log.i("t_type", "Type Finish");
Toast.makeText(SearchActivity.this, "Type Finish",
Toast.LENGTH_LONG).show();
isTyping = false;
}
});
}
}, 2000);
}

This is how I did and works for me!
long delay = 1000; // 1 seconds after user stops typing
long last_text_edit = 0;
Handler handler = new Handler();
private Runnable input_finish_checker = new Runnable() {
public void run() {
if (System.currentTimeMillis() > (last_text_edit + delay - 500)) {
// TODO: do what you need here
// ............
// ............
DoStaff();
}
}
};
EditText editText = (EditText) findViewById(R.id.editTextStopId);
editText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged (CharSequence s,int start, int count, int after){
}
#Override
public void onTextChanged ( final CharSequence s, int start, int before, int count){
//You need to remove this to run only once
handler.removeCallbacks(input_finish_checker);
}
#Override
public void afterTextChanged ( final Editable s){
//avoid triggering event when text is empty
if (s.length() > 0) {
last_text_edit = System.currentTimeMillis();
handler.postDelayed(input_finish_checker, delay);
} else {
}
}
}
);

android textchangelistener is not called

I have the following issue:
Inside a fragment let say FragmentTest, i am having the following thread:
new Thread(new Runnable() {
public void run() {
...
if (condition) {
if (isAdded()) {
getActivity.runOnUiThread(new Runnable () {
public void run() {
rightEditText.addTextChangedListener(FragmentTest.this);} }
}
}
}
...
}
}).start;
inside of onCreate method.
The FragmentTest implements the TextWatcher interface but none of the interface method is called.

Migrating the comment to the answer:
Why do you need to do this inside a separate thread? I think the problem is that all the UI components run on the main UI thread. Try it without the thread.
I guess no further explanation is needed here. OP migrated his code to the UI thread and it worked.

public class MainActivity extends AppCompatActivity implements TextWatcher {
EditText edttext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edttext = (EditText) findViewById(R.id.editText);
edttext.addTextChangedListener(this);
}
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(MainActivity.this,"change",Toast.LENGTH_SHORT).show();
}
});
}
#Override
public void afterTextChanged(Editable editable) {
}
}

Android AutoCompleteTextView : Perform a AsyncTask call only once on TextChange

I have an AutoCompleteTextView in my layout. After the user entered the first character, I'd like to do an API call, which I'm doing in an AsyncTask. I've used addTextChangedListener and I'm doing the API call on TextChanged. But the problem is that the API call is getting done each time the user makes any change to the AutoCompleteTextView.
But I'd want the API call to happen only once, that is after the first character is inputted. How do I achieve this ?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_places_search);
search_airport = (AutoCompleteTextView) findViewById(R.id.place_search);
autocompleteadapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, airports);
search_airport.setAdapter(autocompleteadapter);
search_airport.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
mAirport = new AsyncTaskAirport(search_airport.getEditableText().toString().substring(0, 1));
mAirport.execute((Void) null);
}
#Override
public void afterTextChanged(Editable s) {
}
});
}

try this,
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(s.toString().trim().length()==1){
mAirport = new AsyncTaskAirport(search_airport.getEditableText().toString().substring(0, 1));
mAirport.execute((Void) null);
}
}

You can solve your problem with a timer.Here is how
#Override
public void onTextChanged(CharSequence s, int start, int before, int count)
{
int COMPLETION_DELAY = 2000;
if (timer != null)
{
timer.cancel();
timer.purge();
timer = null;
}
timer = new Timer();
timer.schedule(new TimerTask()
{
#Override
public void run()
{
new Handler(Looper.getMainLooper()).post(new Runnable()
{
#Override
public void run()
{
if (s.toString().length() >= appCompatAutoCompleteTextView.getThreshold())
{
//CALL WebService Here
}
}
});
}
}, COMPLETION_DELAY);
}
now your service will not be called when user making changes while typing in auto complete. service will only be called once user stops + 2 Second.

android editText: detect when user stops editing

I have an editText which represent an input for a search criteria. I want to know if there is a way to detect when user stops editing this editText so I can query the db for data for my list. For example, if the user types "test" I want to be notified only after user has typed the word, not after user types each letter, like text watcher does. Do you have any ideas? I would avoid to use some timer to measure milliseconds elapsed between key pres events.

Not incredibly elegant, but this should work.
Initializations:
long idle_min = 4000; // 4 seconds after user stops typing
long last_text_edit = 0;
Handler h = new Handler();
boolean already_queried = false;
Set up your runnable that will be called from the text watcher:
private Runnable input_finish_checker = new Runnable() {
public void run() {
if (System.currentTimeMillis() > (last_text_edit + idle_min - 500)) {
// user hasn't changed the EditText for longer than
// the min delay (with half second buffer window)
if (!already_queried) { // don't do this stuff twice.
already_queried = true;
do_stuff(); // your queries
}
}
}
};
Put this in your text watcher:
last_text_edit = System.currentTimeMillis();
h.postDelayed(input_finish_checker, idle_min);

First create the following field :
private Date _lastTypeTime = null;
Then make sure your your editText implements 'TextWatcher':
_editText.addTextChangedListener(this);
then, override the interface`s methods as follows:
#Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
{
_lastTypeTime = new Date();
}
#Override
public void afterTextChanged(Editable arg0)
{
}
#Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
{
// dispatch after done typing (1 sec after)
Timer t = new Timer();
TimerTask tt = new TimerTask()
{
#Override
public void run()
{
Date myRunTime = new Date();
if ((_lastTypeTime.getTime() + 1000) <= myRunTime.getTime())
{
post(new Runnable()
{
#Override
public void run()
{
Log.d("<tag>", "typing finished!!!");
}
});
}
else
{
Log.d("<tag>", "Canceled");
}
}
};
t.schedule(tt, 1000);
}

Here's how you can detect event you are looking for.
Declarations and initialization:
private Timer timer = new Timer();
private final long DELAY = 1000; // in ms
Listener in e.g. onCreate()
EditText editText = (EditText) findViewById(R.id.editTextStopId);
editText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
#Override
public void onTextChanged(final CharSequence s, int start, int before,
int count) {
if(timer != null)
timer.cancel();
}
#Override
public void afterTextChanged(final Editable s) {
//avoid triggering event when text is too short
if (s.length() >= 3) {
timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
// TODO: do what you need here (refresh list)
// you will probably need to use
// runOnUiThread(Runnable action) for some specific
// actions
queryDB();
}
}, DELAY);
}
}
});
So, when text is changed the timer is starting to wait for any next changes to happen. When they occure timer is cancelled and then started once again.

This is how I did and works for me!
long delay = 1000; // 1 seconds after user stops typing
long last_text_edit = 0;
Handler handler = new Handler();
private Runnable input_finish_checker = new Runnable() {
public void run() {
if (System.currentTimeMillis() > (last_text_edit + delay - 500)) {
// TODO: do what you need here
DoStaff();
}
}
};
EditText editText = (EditText) findViewById(R.id.editTextStopId);
editText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
#Override
public void onTextChanged(final CharSequence s, int start, int before,
int count) {
//You need to remove this to run only once
handler.removeCallbacks(input_finish_checker);
}
#Override
public void afterTextChanged(final Editable s) {
//avoid triggering event when text is empty
if (s.length() > 0) {
last_text_edit = System.currentTimeMillis();
handler.postDelayed(input_finish_checker, delay);
} else {
}
}
});

the easiest way to check if editText is has text or NOT (only once) , do this :
private boolean newState;
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.somLayout);
edt.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void afterTextChanged(Editable editable) {
if (!editable.trim().isEmpty()) {
checkIsTyping(true);
} else {
checkIsTyping(false);
}
}
});
}
private void checkIsTyping(boolean typeState) {
if (newState != typeState) {
Toast.makeText(appCompatActivity, "typingState " + newState,
Toast.LENGTH_SHORT).show();
}
newState = typeState;
}

Managing Delays in an android app

Hey guys, i would like to know how to manage delays in an android application, for example, I have an overridden method onTextChanged(). In relation to that I want to set a delay like .5 seconds in order to finalized what the user is typing in my autocomplete textbox. If the user hangs/stop typing in .5 sec, i wanted a certain method or implementation to execute in my code(i.e. my own filtering scheme/logic in my autocomplete textbox, just to lessen resource usage within my app, thanks).
Here's my sample code:
protected AutoCompleteTextView autoCompleteView;
protected AutoCompleteAdapter suggsAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
countries = getResources().getStringArray(R.array.countries_array);
autoCompleteView = (AutoCompleteTextView) findViewById(R.id.autocomplete_country);
TextWatcher textChecker = new TextWatcher() {
#Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//here inside this overridden method, I wanted to create a delay in order to lessen the
//use of resources.
String enteredText = autoCompleteView.getText().toString();
refreshList(enteredText);
}
};
autoCompleteView.addTextChangedListener(textChecker);
}
and for example, the user typed "Lond"(for String like "London") with each letter typed less than .5 sec, I want all the previous onTextChanged() method called(method call in typing "L", "o" and "n") to be disregarded and only the onTextChanged() when the last letter was typed would be granted for execution.
How would I do that, please help me:(.

You can create a Handler subclass and call Handler.sendEmptyMessageDelayed() or Handler.sendMessageDelayed() method when onTextChanged() is triggered. And you can remove messages from the message queue using Handler.removeMessages(). You should process messages in Handler.handleMessage() method. So your onTextChanged() method will be something like:
mHandler.removeMessages(MESSAGE_TEXT_CHANGED);
mHandler.sendEmptyMessage(MESSAGE_TEXT_CHANGED, 500);
EDIT: Here's an example of code. I haven't tested it yet, so I'm not sure it works.
private static final int AUTOCOMPLETE_DELAY = 500;
private static final int MESSAGE_TEXT_CHANGED = 0;
private Handler mHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
if (msg.what == MESSAGE_TEXT_CHANGED) {
String enteredText = (String)msg.obj;
refreshList(enteredText);
}
}
};
// ... your code here
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String enteredText = autoCompleteView.getText().toString();
mHandler.removeMessages(MESSAGE_TEXT_CHANGED);
final Message msg = Message.obtain(mHandler, MESSAGE_TEXT_CHANGED, enteredText);
mHandler.sendMessageDelayed(msg, AUTOCOMPLETE_DELAY);
}

I am writing Running code for autocomplete.
First onTextChanged will be called.
public void onTextChanged(CharSequence s, int start, int before, int count) {
String newText = s.toString();
if(!newText.trim().equals(""))
Autocompletes_Timer(newText);
}
now we need a Handler.
Hander handler = new Handler();
private void Autocompletes_Timer(final String newText) {
// new text will be here. so if you type fast within 1 sec.
// handler will be remover each time so that handler post delay also be remove.
if(handler!= null)
handler.removeCallbacksAndMessages(null);
// new text will be in runnable with 1 sec delay.
handler.postDelayed(runnable(newText), 1000);
}
// it will be start work after 1 sec.
// if you stop the typing then it will complete work like as sending data at server.
// if you continue typing , it will not complete work and each type will be removeCallbackAndMessage.
private Runnable runnable(final String newText) {
Runnable runnable = new Runnable() {
#Override
public void run() {
Log.d("Autocompleted", newText);
// call AysncTask here
}
};
return runnable;
}
just copy and paste my code. It should be fix your problem . Enjoy.

use a CountDownTimer
protected AutoCompleteTextView autoCompleteView;
protected AutoCompleteAdapter suggsAdapter;
String TAG = "Timer";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
countries = getResources().getStringArray(R.array.countries_array);
autoCompleteView = (AutoCompleteTextView) findViewById(R.id.autocomplete_country);
TextWatcher textChecker = new TextWatcher() {
CountDownTimer countDownTimer = new CountDownTimer(500,100) {
#Override
public void onTick(long millisUntilFinished) {
Log.d(TAG, "addressTextWatcher.countDownTimer.onTick() -> Tick: " + millisUntilFinished);
}
#Override
public void onFinish() {
Log.d(TAG, "addressTextWatcher.countDownTimer.onTick() -> Finish");
String enteredText = autoCompleteView.getText().toString();
refreshList(enteredText);
}
};
#Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
countDownTimer.cancel();
countDownTimer.start();
}
};
autoCompleteView.addTextChangedListener(textChecker);
}