I can't find attribute android:onTextChanged
in EditText when implement data-binding to my fragment xml. I have searched for the answer, and this one said it is supported out of the box. I have set
data-binding { enable = true }
in my build.gradle, and my current build gradle is 3.5.3.
Here is a part of my xml:
<layout>
<data>
<variable
name="vm"
type=".ViewModel" />
</data>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".screens.hangouts.create_hangout_new.Step1FragmentNew">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_category"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/tv_hangout_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="@id/rv_category" />
<EditText
android:id="@+id/et_hangout_name"
android:background="@drawable/bkg_stroke_red"
android:layout_width="match_parent"
android:layout_height="30dp"
app:layout_constraintTop_toBottomOf="@id/tv_hangout_name" />
...
You can use
android:afterTextChanged="@{(editable)->viewModel.afterEmailTextChanged(editable)}"
set Function in your viewmodel
public void afterEmailTextChanged(CharSequence s) {
user.setEmail(s.toString());
}
In your xml file:
<EditText
android:id="@+id/et"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:textChangedListener="@{model.textWatcher}" />
In your code like this in your model class :
public class Model{
private TextWatcher textWatcher;
public Model(){
this.textWatcher= getTextWatcherIns();
}
private TextWatcher getTextWatcherIns() {
return new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
//do some thing
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//do some thing
}
@Override
public void afterTextChanged(Editable s) {
//do some thing
}
};
}
public TextWatcher getTextWatcher() {
return textWatcher;
}
public void setTextWatcher(TextWatcher textWatcher) {
this.textWatcher = textWatcher;
}
@BindingAdapter("textChangedListener")
public static void bindTextWatcher(EditText editText, TextWatcher textWatcher) {
editText.addTextChangedListener(textWatcher);
}
}
For more information about it read this Doc. Also include in your answer app:textChangedListener
in EditText
and try.
I hope it'll help you...!
You can use 2-way binding if you're using data binding like below,
<EditText
android:id="@+id/et_hangout_name"
android:background="@drawable/bkg_stroke_red"
android:layout_width="match_parent"
android:layout_height="30dp"
android:text="@={viewmodel.textChangedMutableLiveData}"
app:layout_constraintTop_toBottomOf="@id/tv_hangout_name" />
Then in your viewmodel,
var textChangedMutableLiveData = MutableLiveData<String>()
var textChangedLiveData = textChangedMutableLiveData.map {
// here you get the changed text every time user types something. now you can observe textChangedLiveData in your activity and do whatever you wanna do when text changes.
}
You need to define a BindingAdapter
in order to use it in XML like android:afterTextChanged
Define somewhere in your project
@BindingAdapter("android:afterTextChanged")
public static void setListener(TextView view, TextViewBindingAdapter.AfterTextChanged after) {
setListener(view,after);
}
The code is taken reference here: this link
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