我一直在为基本应用程序使用双向数据绑定,它很顺利,直到我开始使用自定义视图和attrs.
我想创建一个自定义视图,有一个TextView和一个EditText,并在另一个布局中使用它：
<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" />
我有它的自定义attr
<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,我执行以下操作：
<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:" />
它的单向数据绑定很好用,但无论我改变文本,他都不会在课堂上给我发回调
@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 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);
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);
}
}
有谁知道如何让它正常工作？
解决方法
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,int defStyleAttr,int defStyleRes) {
super(context,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 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：
<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}"/>
