Android自定义视图和自定义Attr的双向数据绑定

概述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 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 *** 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？

完全代码可以在here找到

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                                androID:layout_wIDth="match_parent"                androID:layout_height="wrap_content"                bind:filtertitle="@{@string/filter_product}"                bind:filterStringValue="@={sfmodel.product}"/>

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