Develop Reference

Lag after setting text in OnTextChanged()

Below is an example that replicates my lagging problem. Once I set the text on the EditTextView it takes at least 1.5 seconds for the user to be allowed to input another character.
amountEditText.addTextChangedListener(new TextWatcher() {
#Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
#Override public void afterTextChanged(Editable s) {}
#Override public void onTextChanged(CharSequence s, int start, int before, int count) {
String amount = s.toString();
if( !amount.equals(current )) {
amountEditText.removeTextChangedListener(this);
amountEditText.setText(s);
Selection.setSelection(amountEditText.getText(), amountEditText.getText().length());
amountEditText.addTextChangedListener(this);
}
}
});
I've searched around and have not found a solution.

I identified that the issue was coming from the textView.setText() call.
The solution was to not use setText(), instead use the Editable that is provided to you in the onTextChanged callback.
I tried to use the Editable before, however i couldn't get it working with inputs such as "$12,000".
This was due to having InputFilters still attached to the Editable.
Regards,
Scott.

It lags because you remove and then readd your listener.

You seems to be trying to select the text inside the EditText. To do so, simply set editText.setSelectAllOnFocus(true); or android:selectAllOnFocus="true" in xml. Then remove the entire TextChangedListener from your code.

According to me it is most probably because of trying to remove (amountEditText.removeTextChangedListener(this);) and add (amountEditText.addTextChangedListener(this);) the Text Change Listener every time. I would recommend you to replace your code without those adding and removal.
Hope this helped.

Android: How to keep Default number always even if user wants to delete it, and how to delete default number when user inputs a value?

I have a simple EditText, which inputs only numbers.
I want to show 0(zero) even if user presses backspace.
Now zero is getting deleted.
Moreover, I need to remove this default zero, when user starts entering values.
How do i achieve it?

You should use android:hint="0" or in more complex way..
You should use TextWatcher and override the below three methods. THer you can get the text in the arguments as CharSequence in the beforeTextChanged and onTextChanged methods and in afterTextChanged you have Editable from where you can get the data in the EditText. Write in the desired function as per your logic and it should work like a charm.
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) {
}
#Override
public void afterTextChanged(Editable s) {
}
});

It sounds like you want:
<EditText
android:hint="0" />

Associate EditText with a TextView for labeling purposes

Hi I am learning Android programming and have run into an issue that I couldn't get a clear answer to through researching.
I have a TextView which serves as a label for my EditText. I have a method which checks if the EditText is an empty String. If the string is empty I want to be able to get a reference to the TextView that corresponds to that EditText in order to make a toast saying something like "please enter a value for ".
I've looked into getLabelFor/setLabelFor but is there a way to do this in the layout XML?
What is best practice for this type of functionality.

You're describing a functionally that is build in to EditText. There is a special field you can define in xml called hint, which is the recommended way to label an EditText rather than a nearby TextView. Additionally, EditText has a method called setError() (link). If the user attempts to hit a submit button, for example, you can check to see if the EditText is empty and if so, call setError().

I wonder if the following is the thing that you need
TextWatcher inputTextWatcher = new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count, int after){
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.toString().equals("")) {
textView.setText("please enter a value for ..");
} else {
textView.setText("<the textedit is not empty>");
}
}
public void afterTextChanged(Editable s) {
}
};
editText.addTextChangedListener(inputTextWatcher);

Android - EditText saves T9 suggested values

I have an application where user inputs text into EditText field. After user clicks OK (in keyboard input mode), a correct value is in the EditText (lets say "Smile").
if (answers.get(counter).getText().equals(opponentAnswers.get(counter)))
But this if statement fails, because the same EditText has the values that were suggested by T9 option, when user was inputing his answer (for example values of EditText would be "Smile Smiling Smiled"), while it should only have a value "Smile".
Any ideas how to solve this issue?

That's really weird. These are kind of guesses, but this is what I'd try next if I were you:
A. Instead of doing an equals against getText(), try doing a toString on getText(), so:
if (answers.get(counter).getText().toString().equals(opponentAnswers.get(counter)))
B. If that doesn't work then you could try adding a TextWatcher using addTextChangedListener on the EditText, and getting the value from that. Calling toString() on the editable returned in afterTextChanged might give you the value you want.
private class SearchTextWatcher implements 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) {
}
#Override
public void afterTextChanged(Editable s) {
//Get the text the user sees
String textShownToUser = s.toString();
}
}
Hope this helps! Best of luck!

How to catch key pressed with the virtual keyboard and disable it for EditText in Android?

I need to control pressed buttons, before they goes to my EditText widget. It's should work like filter.
For example: I need that user could fill EditText only with digits 1,2,3,4,5 other symbols must be ignored. So the part of buttons on virtual keyboard should be disabled or I need to catch last pressed symbol, analyze it and disable for EditText.
Who knows the way how to solve this problem?
Thanks..

statusEdt.addTextChangedListener(new TextWatcher(){
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count) {
//do stuff
charTxt.setText(statusEdt.getText().length() + "/140");
}
});
I used this TextChangedListener(TextWatcher) to keep a count of how many characters had been typed into an EditText for a Twitter client I made. You could probably use a listener like this. You'll want to override beforeTextChanged or onTextChanged. These methods will pass you whatever CharSequence has been typed. You can check what was typed in and if it is not valid input you can remove it by calling setText() and passing in whatever has been typed so far minus the invalid characters.

What you probably need is an InputFilter.
For example to allow only digits, sign and decimal point:
editText.setFilters(DigistKeyListener.getInstance(true, true));