本文介绍了具有自定义视图和自定义属性的Android 2-Way数据绑定的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直在为基本应用程序使用2向数据绑定，直到我从自定义视图和属性开始，它一直运行得很好.
I've been using 2-way databinding for a basic application, it was going pretty well, until i start with custom views and attrs.
我想创建一个具有TextView和EditText的自定义视图，并在另一个布局中使用它:
I want to create a custom view, with has a TextView and a EditText, and use it inside another layout:
<TextView
android:text="Holder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tvTitle"
android:layout_weight="1" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="none"
android:text="Name"
android:ems="10"
android:id="@+id/etAnwser"
android:layout_weight="1" />
我有自定义属性
<resources>
<declare-styleable name="form_item">
<attr name="tvTitle" format="string" />
<attr name="anwserHint" format="string" />
<attr name="anwserText" format="string" />
<attr name="android:enabled" />
</declare-styleable>
在片段中，我将执行以下操作:
In the fragment i do the following:
<rhcloud.com.financialcontrol.tabutil.FormItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:enabled="@{state.get()}"
form_item:anwserText='@={expense.description}'
form_item:tvTitle="Description:" />
具有1向数据绑定的效果很好，但是无论我如何更改文本，他都不会在类中向我发送回调
It works nice has 1-way databind, but whatever i change the text, he don't send me the callback in class
@InverseBindingMethods(value = {
@InverseBindingMethod(type = FormItem.class, attribute = "anwserText"),
})
public class FormItem extends LinearLayout {
private TextView tvTitle;
private EditText etAnwser;
public FormItem(@NonNull Context context) {
super(context);
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.form_item, this);
tvTitle = (TextView) findViewById(R.id.tvTitle);
etAnwser = (EditText) findViewById(R.id.etAnwser);
}
public FormItem(@NonNull Context context, @NonNull String title) {
this(context);
setTvTitle(title);
}
public FormItem(@NonNull Context context, @NonNull String title, @NonNull String hint) {
this(context, title);
setAnwserHint(hint);
}
public FormItem(@NonNull Context context, @NonNull String title, @NonNull String hint, @NonNull String anwserText) {
this(context, title, hint);
setAnwserHint(anwserText);
}
public FormItem(@NonNull Context context, @NonNull AttributeSet attrs) {
super(context, attrs);
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.form_item, this);
tvTitle = (TextView) findViewById(R.id.tvTitle);
etAnwser = (EditText) findViewById(R.id.etAnwser);
TypedArray a = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.form_item,
0, 0);
try {
setTvTitle(a.getString(R.styleable.form_item_tvTitle));
setAnwserHint(a.getString(R.styleable.form_item_anwserHint));
setAnwserText(a.getString(R.styleable.form_item_anwserText));
String isEnabled = a.getString(R.styleable.form_item_android_enabled);
if (isEnabled != null) {
setEnable(Boolean.parseBoolean(isEnabled));
}
} finally {
a.recycle();
}
}
public void setTvTitle(String title) {
tvTitle.setText(title);
}
public String getTvTitle() {
return tvTitle.getText().toString();
}
public void setAnwserHint(String hint) {
etAnwser.setHint(hint);
}
public String getAnwserHint() {
return etAnwser.getHint().toString();
}
public void setEnable(boolean isEnable) {
tvTitle.setEnabled(isEnable);
etAnwser.setEnabled(isEnable);
}
public void setAnwserText(String anwserText) {
etAnwser.setText(anwserText);
}
public String getAnwserText() {
return etAnwser.getText().toString();
}
@InverseBindingAdapter(attribute = "form_item:anwserText")
public static String setOnAnwserTextAttrChanged(final String value){
Log.d("Test","Calling InverseBindingAdapter: " + value);
return value;
}
@BindingAdapter(value = {"anwserTextAttrChanged"},
requireAll = false)
public static void setOnAnwserTextAttrChanged(final FormItem view,final InverseBindingListener anwserTextAttrChanged){
Log.d("Test","Calling BindingAdapter: " + view.getAnwserText());
if(anwserTextAttrChanged == null){
}else{
Log.d("Test","Calling here");
anwserTextAttrChanged.onChange();
}
}
@BindingAdapter(value = {"android:enabled"})
public static void customEnable(FormItem formItem, boolean isEnable) {
formItem.setEnable(isEnable);
}
}
有人知道如何使其正常工作吗?
Does anyone know how to make it work properly?
完整代码可在此处
推荐答案
这对我有用:
@InverseBindingMethods(value = {
@InverseBindingMethod(type = FilterPositionView.class, attribute = "bind:filterStringValue", method = "getFilterValue", event = "android:filterStringValuetAttrChanged")
})
public class FilterPositionView extends LinearLayout {
private FilterPositionBinding mBinding;
public FilterPositionView(Context context) {
super(context);
init(context);
}
public FilterPositionView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public FilterPositionView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
public FilterPositionView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context);
}
private void init(Context context) {
mBinding = DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.filter_position, this, true);
setOrientation(HORIZONTAL);
mBinding.filterPositionCheck.setOnCheckedChangeListener((buttonView, isChecked) -> {
mBinding.filterPositionValue.setEnabled(isChecked);
if (!isChecked) mBinding.filterPositionValue.setText("");
});
}
/**
* Zwraca wpisywany text
*
* @return wpisane litery tekstu
*/
public String getFilterValue() {
return mBinding.filterPositionValue.getText().toString();
}
@BindingAdapter(value = {"bind:filterTitle", "bind:filterStringValue", "bind:filterDateValue"}, requireAll = false)
public static void setFilterBinding(FilterPositionView positionView, String filterTitle,
String filterStringValue, Long filterDateValue) {
positionView.mBinding.filterPositionTitle.setText(filterTitle);
if (filterStringValue != null)
positionView.mBinding.filterPositionValue.setText(filterStringValue);
if (filterDateValue != null)
positionView.mBinding.filterPositionValue.setText(DateTimeFormatUtil.format(filterDateValue));
}
@BindingAdapter(value = {"android:afterTextChanged", "android:filterStringValuetAttrChanged"}, requireAll = false)
public static void setTextWatcher(FilterPositionView filterPositionView, final TextViewBindingAdapter.AfterTextChanged after,
final InverseBindingListener textAttrChanged) {
TextWatcher newValue = 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) {
}
@Override
public void afterTextChanged(Editable s) {
if (after != null) {
after.afterTextChanged(s);
}
if (textAttrChanged != null) {
textAttrChanged.onChange();
}
}
};
TextWatcher oldValue = ListenerUtil.trackListener(filterPositionView.mBinding.filterPositionValue, newValue, R.id.textWatcher);
if (oldValue != null) {
filterPositionView.mBinding.filterPositionValue.removeTextChangedListener(oldValue);
}
filterPositionView.mBinding.filterPositionValue.addTextChangedListener(newValue);
}
}
当然，您必须在XML布局中添加@={}，如下所示:
Of course You have to add @={} in your XML layouts like below:
<com.example.customviews.FilterPositionView
style="@style/verticalLabeledValueStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
bind:filterTitle="@{@string/filter_product}"
bind:filterStringValue="@={sfmodel.product}"/>
这篇关于具有自定义视图和自定义属性的Android 2-Way数据绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！