綁定與RecyclerView，其中每個項目的CheckBox

Question

我有RecyclerView，其中每個項目代表，CheckBox和EditText上 當複選框點擊EditText上的文字應該通過罷工， 我有ObservableBoolean這是article.complete 我用它在app:checkBoxChangeListener="@{article.complete}" app:itemComplete="@{article.complete}"

它的工作，除非我滾動RecyclerView，然後在複選框另一個項目的文字點擊是通過

@BindingAdapter("itemComplete") 
public static void bindItemComplete(EditText itemInput, boolean complete){ 
itemInput.setPaintFlags(complete ? 
(itemInput.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG) : 0); 
} 

Article.java

罷工0

public class Article{ 
    public final ObservableBoolean complete = new ObservableBoolean(); 
} 

XML文件：

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



<layout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto"> 
    <data> 

    <import type="android.view.View" /> 

    <variable 
     name="viewModel" 
     type="se.ica.handla.articles.ArticleListViewModel" /> 

    <variable 
     name="article" 
     type="se.ica.handla.models.articles.Article" /> 

</data> 

<android.support.constraint.ConstraintLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:orientation="vertical"> 
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:orientation="vertical"> 

<EditText 
android:id="@+id/editText" 
android:layout_width="0dp" 
android:layout_height="wrap_content" 
android:layout_marginBottom="8dp" 
app:itemComplete="@{article.complete}" 
/> 
<CheckBox 
android:id="@+id/checkBox" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:checked="@={article.complete}" /> 
</android.support.constraint.ConstraintLayout> 
</layout> 

Answer 1

寫在我的意見，我建議你使用雙向-數據綁定。

您可以完全刪除該BindingAdapter：

@BindingAdapter(value = {"checkBoxChangeListener", "article"}, requireAll = false) 
public static void bindCheckBox(CheckBox view, final ObservableBoolean checked, Article article) {  
     if (view.getTag(R.id.binded) == null) {  
      //Here you are setting the attributes to your *view* and 
      //decouple it from your article. It does not reference it, 
      //the properties (isChecked) isnow on the view.    
      //So when your view gets recycled when you scroll, 
      //it still has the property you set the last time - 
      //and not from your current article, which is displayed now in the view. 

      view.setTag(R.id.binded, true); 
      view.setOnCheckedChangeListener((buttonView, isChecked) -> checked.set(isChecked));} 
     } 
} 

正如你已經發現了，你的XML應該是現在這個樣子，採用雙向數據綁定：

<EditText 
android:id="@+id/editText" 
android:layout_width="0dp" 
android:layout_height="wrap_content" 
android:layout_marginBottom="8dp" 
app:itemComplete="@{article.complete}" 
/> 

<CheckBox 
android:id="@+id/checkBox" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:checked="@={article.complete}" //@={} for Two-Way Databinding 
/>