我在 android 中有一个组合视图，其中包含几个 textView 和一个 EditText。我为我的自定义视图定义了一个名为textand方法getText的属性。setText现在我想以绑定到内部编辑文本的方式为我的自定义视图添加 2 路数据绑定，因此如果我的数据得到更新，编辑文本也应该更新（现在可以使用），当我的编辑文本得到更新时，我的数据也应该更新。
我的绑定类看起来像这样
@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();
}
});
}
}
}
我试图用下面的代码绑定文本。userInfo是一个可观察的类。
<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}"
/>
当我运行项目时出现此错误
错误：(20, 13) 在视图类型“ir.avalinejad.pasargadinsurance.component.ErrorInputLayout”上找不到事件“textAttrChanged”
我的自定义视图看起来像这样
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);
}
}