Question

我有一个模型类

public class ScopeDefination extends BaseObservable {

String value;
String key;
boolean isPrivate;
String category;

public String getCategory() {
    return category;
}

public void setCategory(String category) {
    this.category = category;
}

public ScopeDefination(String key, String value, boolean isPrivate) {
    this.key = key;
    this.value = value;
    this.isPrivate = isPrivate;
}

public ScopeDefination(String key, String value, boolean isPrivate, String category) {
    this.key = key;
    this.value = value;
    this.isPrivate = isPrivate;
    this.category = category;
}

@Bindable
public String getKey() {
    return key;
}

public void setKey(String key) {
    this.key = key;notifyPropertyChanged(developer.manish.publicprivatescopecategory.BR.key);
}

@Bindable
public String getValue() {
    return value;
}

public void setValue(String value) {
    this.value = value;
    notifyPropertyChanged(developer.manish.publicprivatescopecategory.BR.value);
}

public boolean isPrivate() {
    return isPrivate;
}

public void setPrivate(boolean aPrivate) {
    isPrivate = aPrivate;
}

}

我试图在类中使用它来进行数据绑定，就像这样

  ScopeDefination scopeDefination1 = new ScopeDefination(Keys.ADDRESS_HOME,"Address", true, Keys.FINANCIAL_INFO);
        ScopeDefination scopeDefination2 = new ScopeDefination(Keys.NAME,"Name", true, Keys.FINANCIAL_INFO);

        ObservableArrayMap<String, Object> user = new ObservableArrayMap<>();
        user.put(Keys.ADDRESS_HOME, scopeDefination1);
        user.put(Keys.NAME, scopeDefination2);
 fragmentFirebaseBinderBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_firebase_binder, container, false);
        fragmentFirebaseBinderBinding.setUser(user);

我的XML是

<?xml version="1.0" encoding="utf-8"?>

<data>

    <import type="developer.manish.publicprivatescopecategory.ScopeDefination" />

    <import type="android.databinding.ObservableMap" />

    <variable
        name="user"
        type="ObservableMap&lt;String, Object>" />
</data>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="developer.manish.publicprivatescopecategory.FirebaseBinder">

    <TextView
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text='@{((ScopeDefination)user["username"]).getValue()}'/>

    <TextView
        android:id="@+id/address"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text='@{((ScopeDefination)user["address_home"]).getValue()}' />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text='@{((ScopeDefination)user["username"]).getValue()}' />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text='@{((ScopeDefination)user["address_home"]).getValue()}' />

</LinearLayout>

我能够在用户界面上显示数据，但是当我在Editext中编辑数据时，相应的文本视图未获得更新。

Answer 1

你想要的是双向绑定，它与普通绑定略有不同。请参阅George Mount的blog entry。

基本上，您需要从

编辑Binding表达式

android:text='@{((ScopeDefination)user["username"]).getValue()}'

到

android:text='@={((ScopeDefination)user["username"]).value}'

请注意=和@之间有一个额外的{。只要EditText中的数据发生变化，这将通知您的模型。此外，您无法使用Two-Way Binding中的方法，但使用.value将起作用。感谢@George Mount指出这一点。

ObservableArrayMap，其中Object为值未获取在editext中的值更改时观察到

1 个答案: