I have a componed view in android contains several textViews and one EditText. I defined an attribute for my custom view called text and getText, setText methods. Now I want to add a 2-way data binding for my custom view in a way its bind to inner edit text so if my data gets updated edit text should be updated as well (that's works now) and when my edit text gets updated my data should be updated as well.
My binding class looks like this
@InverseBindingMethods({
@InverseBindingMethod(type = ErrorInputLayout.class, attribute = "text"),
})
public class ErrorInputBinding {
@BindingAdapter(value = "text")
public static void setListener(ErrorInputLayout errorInputLayout, final InverseBindingListener textAttrChanged) {
if (textAttrChanged != null) {
errorInputLayout.getInputET().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) {
textAttrChanged.onChange();
}
});
}
}
}
I tried to bind text with the code below. userInfo is an observable class.
<ir.avalinejad.pasargadinsurance.component.ErrorInputLayout
android:id="@+id/one_first_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:title="@string/first_name"
app:text="@={vm.userInfo.firstName}"
/>
When I run the project I get this error
Error:(20, 13) Could not find event 'textAttrChanged' on View type 'ir.avalinejad.pasargadinsurance.component.ErrorInputLayout'
And my custom view looks like this
public class ErrorInputLayout extends LinearLayoutCompat implements TextWatcher {
protected EditText inputET;
protected TextView errorTV;
protected TextView titleTV;
protected TextView descriptionTV;
private int defaultGravity;
private String title;
private String description;
private String hint;
private int inputType = -1;
private int lines;
private String text;
private Subject<Boolean> isValidObservable = PublishSubject.create();
private Map<Validation, String> validationMap;
public ErrorInputLayout(Context context) {
super(context);
init();
}
public ErrorInputLayout(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
readAttrs(attrs);
init();
}
public ErrorInputLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
readAttrs(attrs);
init();
}
private void readAttrs(AttributeSet attrs){
TypedArray a = getContext().getTheme().obtainStyledAttributes(
attrs,
R.styleable.ErrorInputLayout,
0, 0);
try {
title = a.getString(R.styleable.ErrorInputLayout_title);
description = a.getString(R.styleable.ErrorInputLayout_description);
hint = a.getString(R.styleable.ErrorInputLayout_hint);
inputType = a.getInt(R.styleable.ErrorInputLayout_android_inputType, -1);
lines = a.getInt(R.styleable.ErrorInputLayout_android_lines, 1);
text = a.getString(R.styleable.ErrorInputLayout_text);
} finally {
a.recycle();
}
}
private void init(){
validationMap = new HashMap<>();
setOrientation(VERTICAL);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
titleTV = (TextView) LayoutInflater.from(getContext()).inflate(R.layout.error_layout_default_title_textview, null, false);
addView(titleTV);
descriptionTV = (TextView) LayoutInflater.from(getContext()).inflate(R.layout.error_layout_default_description_textview, null, false);
addView(descriptionTV);
readInputFromLayout();
if(inputET == null) {
inputET = (EditText) LayoutInflater.from(getContext()).inflate(R.layout.error_layout_defult_edittext, this, false);
addView(inputET);
}
errorTV = (TextView) LayoutInflater.from(getContext()).inflate(R.layout.error_layout_default_error_textview, null, false);
addView(errorTV);
inputET.addTextChangedListener(this);
defaultGravity = inputET.getGravity();
//set values
titleTV.setText(title);
if(description != null && !description.trim().isEmpty()){
descriptionTV.setVisibility(VISIBLE);
descriptionTV.setText(description);
}
if(inputType != -1)
inputET.setInputType(inputType);
if(hint != null)
inputET.setHint(hint);
else
inputET.setHint(title);
inputET.setLines(lines);
inputET.setText(text);
}
private void readInputFromLayout() {
if(getChildCount() > 3){
throw new IllegalStateException("Only one or zero view is allow in layout");
}
if(getChildCount() == 3){
View view = getChildAt(2);
if(view instanceof EditText)
inputET = (EditText) view;
else
throw new IllegalStateException("only EditText is allow as child view");
}
}
public void setText(String text){
inputET.setText(text);
}
public String getText() {
return text;
}
public void addValidation(@NonNull Validation validation, @StringRes int errorResourceId){
addValidation(validation, getContext().getString(errorResourceId));
}
public void addValidation(@NonNull Validation validation, @NonNull String error){
if(!validationMap.containsKey(validation))
validationMap.put(validation, error);
}
public void remoteValidation(@NonNull Validation validation){
if(validationMap.containsKey(validation))
validationMap.remove(validation);
}
public EditText getInputET() {
return inputET;
}
public TextView getErrorTV() {
return errorTV;
}
@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) {
checkValidity();
if(editable.toString().length() == 0) //if hint
inputET.setGravity(Gravity.RIGHT);
else
inputET.setGravity(defaultGravity);
}
public Subject<Boolean> getIsValidObservable() {
return isValidObservable;
}
private void checkValidity(){
//this function only shows the first matched error.
errorTV.setVisibility(INVISIBLE);
for(Validation validation: validationMap.keySet()){
if(!validation.isValid(inputET.getText().toString())) {
errorTV.setText(validationMap.get(validation));
errorTV.setVisibility(VISIBLE);
isValidObservable.onNext(false);
return;
}
}
isValidObservable.onNext(true);
}
}
