Android 属性 app:itemIconTint 的数据绑定应用程序命名空间将被忽略
Android Data Binding Application namespace for attribute app:itemIconTint will be ignored
几个小时以来，我一直在解决数据绑定问题，特别是使用@BindingAdapter 进行自定义绑定。
我有一个 BottomNavigationView，我想绑定 itemIconTint 和 itemTextColor 以根据布尔值加载特定的 ColorStateList。
所以我有以下 XML :
<?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"
xmlns:tools="http://schemas.android.com/tools"
tools:context="mypackage.HomeActivity">
<data>
<variable
name="utils"
type="mypackage.model.Utils" />
</data>
<android.support.constraint.ConstraintLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/content"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintTop_creator="1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomNavigationView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@{utils.lawyer ? @color/greyish_brown : @color/white}"
app:itemIconTint="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:itemTextColor="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/navigation"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1" />
</android.support.constraint.ConstraintLayout>
</layout>
这是 class 实用程序：
public class Utils {
private boolean lawyer;
public boolean isLawyer() {
return lawyer;
}
public void setLawyer(boolean lawyer) {
this.lawyer = lawyer;
}
@BindingAdapter({"app:itemIconTint"})
public static void setItemIconTint(BottomNavigationView view, ColorStateList colorStateList) {
view.setItemIconTintList(colorStateList);
}
@BindingAdapter({"app:itemTextColor"})
public static void setItemTextColor(BottomNavigationView view, ColorStateList colorStateList) {
view.setItemTextColor(colorStateList);
}
}
所以我的目标是根据布尔值 lawyer 加载不同的 ColorStateList。这样，BottomNavigationView 将具有动态设计。
当我编译时出现这个错误：
14:13:42.540 [ERROR] [system.err] Note: processing adapters
14:13:42.540 [ERROR] [system.err] Note: building generational class cache
14:13:42.540 [ERROR] [system.err] Note: loaded item android.databinding.annotationprocessor.ProcessBindable$IntermediateV1@49d08673 from file
14:13:42.540 [ERROR] [system.err] Note: loaded item android.databinding.annotationprocessor.ProcessExpressions$IntermediateV2@4e48888f from file
14:13:42.540 [ERROR] [system.err] Note: loaded item android.databinding.tool.store.SetterStore$IntermediateV3@11787d5f from file
14:13:42.540 [ERROR] [system.err] /Users/.../model/Utils.java:27: warning: Application namespace for attribute app:itemIconTint will be ignored.
14:13:42.540 [ERROR] [system.err] public static void setItemIconTint(BottomNavigationView view, ColorStateList colorStateList) {
14:13:42.540 [ERROR] [system.err] ^
14:13:42.540 [ERROR] [system.err] Note: STORE addBindingAdapter itemIconTint setItemIconTint(android.support.design.widget.BottomNavigationView,int)
14:13:42.540 [ERROR] [system.err] Note: BINARY created method desc 2 mypackage.model.Utils setItemIconTint, setItemIconTint(android.support.design.widget.BottomNavigationView,android.content.res.ColorStateList)
14:13:42.540 [ERROR] [system.err] /Users/.../model/Utils.java:34: warning: Application namespace for attribute app:itemTextColor will be ignored.
14:13:42.540 [ERROR] [system.err] public static void setItemTextColor(BottomNavigationView view, ColorStateList colorStateList) {
14:13:42.540 [ERROR] [system.err] ^
14:13:42.540 [ERROR] [system.err] Note: STORE addBindingAdapter itemTextColor setItemTextColor(android.support.design.widget.BottomNavigationView,android.content.res.ColorStateList)
14:13:42.540 [ERROR] [system.err] Note: BINARY created method desc 2 mypackage.Utils setItemTextColor, setItemTextColor(android.support.design.widget.BottomNavigationView,android.content.res.ColorStateList)
感谢您的帮助！
编辑：两个不同的颜色文件来自文件夹 Color
编辑 2：正如@tynn 所说，Android 数据绑定不知道资源类型。因此对于 Color 资源 @color 必须替换为 `@colorStateList。所以我做了更改，我的自定义 BindingAdapter 也已更新为接收 ColorStateList 而不是 int。问题是一样的
问题已解决：不需要自定义 BindingAdapter，因为数据绑定会根据每个 class 中现有的 setter 自动生成 setter（检查 Attribute Setters）。我的问题很奇怪，因为 R 文件，它生成得很糟糕。
您混淆了颜色和颜色状态列表。前者只是一个int，而后者应该是一个ColorStateList。在数据绑定 Expression Language 文档的末尾，您发现需要使用 @colorStateList 而不是 @color。 @color 也会产生颜色整数，而不是颜色资源。
对于您的适配器，您还必须使用不带命名空间的属性名称。
但最终在您的情况下，您只需设置 app:itemTextColor 和 app:itemIconTintList 而无需定义适配器。处理器将为您选择正确的设置器 setItemTextColor(ColorStateList) and setItemIconTintList(ColorStateList)。
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomNavigationView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@{utils.lawyer ? @color/greyish_brown : @color/white}"
app:itemIconTintList="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:itemTextColor="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:menu="@menu/navigation" />
几个小时以来，我一直在解决数据绑定问题，特别是使用@BindingAdapter 进行自定义绑定。
我有一个 BottomNavigationView，我想绑定 itemIconTint 和 itemTextColor 以根据布尔值加载特定的 ColorStateList。
所以我有以下 XML :
<?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"
xmlns:tools="http://schemas.android.com/tools"
tools:context="mypackage.HomeActivity">
<data>
<variable
name="utils"
type="mypackage.model.Utils" />
</data>
<android.support.constraint.ConstraintLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/content"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintTop_creator="1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomNavigationView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@{utils.lawyer ? @color/greyish_brown : @color/white}"
app:itemIconTint="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:itemTextColor="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/navigation"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1" />
</android.support.constraint.ConstraintLayout>
</layout>
这是 class 实用程序：
public class Utils {
private boolean lawyer;
public boolean isLawyer() {
return lawyer;
}
public void setLawyer(boolean lawyer) {
this.lawyer = lawyer;
}
@BindingAdapter({"app:itemIconTint"})
public static void setItemIconTint(BottomNavigationView view, ColorStateList colorStateList) {
view.setItemIconTintList(colorStateList);
}
@BindingAdapter({"app:itemTextColor"})
public static void setItemTextColor(BottomNavigationView view, ColorStateList colorStateList) {
view.setItemTextColor(colorStateList);
}
}
所以我的目标是根据布尔值 lawyer 加载不同的 ColorStateList。这样，BottomNavigationView 将具有动态设计。
当我编译时出现这个错误：
14:13:42.540 [ERROR] [system.err] Note: processing adapters
14:13:42.540 [ERROR] [system.err] Note: building generational class cache
14:13:42.540 [ERROR] [system.err] Note: loaded item android.databinding.annotationprocessor.ProcessBindable$IntermediateV1@49d08673 from file
14:13:42.540 [ERROR] [system.err] Note: loaded item android.databinding.annotationprocessor.ProcessExpressions$IntermediateV2@4e48888f from file
14:13:42.540 [ERROR] [system.err] Note: loaded item android.databinding.tool.store.SetterStore$IntermediateV3@11787d5f from file
14:13:42.540 [ERROR] [system.err] /Users/.../model/Utils.java:27: warning: Application namespace for attribute app:itemIconTint will be ignored.
14:13:42.540 [ERROR] [system.err] public static void setItemIconTint(BottomNavigationView view, ColorStateList colorStateList) {
14:13:42.540 [ERROR] [system.err] ^
14:13:42.540 [ERROR] [system.err] Note: STORE addBindingAdapter itemIconTint setItemIconTint(android.support.design.widget.BottomNavigationView,int)
14:13:42.540 [ERROR] [system.err] Note: BINARY created method desc 2 mypackage.model.Utils setItemIconTint, setItemIconTint(android.support.design.widget.BottomNavigationView,android.content.res.ColorStateList)
14:13:42.540 [ERROR] [system.err] /Users/.../model/Utils.java:34: warning: Application namespace for attribute app:itemTextColor will be ignored.
14:13:42.540 [ERROR] [system.err] public static void setItemTextColor(BottomNavigationView view, ColorStateList colorStateList) {
14:13:42.540 [ERROR] [system.err] ^
14:13:42.540 [ERROR] [system.err] Note: STORE addBindingAdapter itemTextColor setItemTextColor(android.support.design.widget.BottomNavigationView,android.content.res.ColorStateList)
14:13:42.540 [ERROR] [system.err] Note: BINARY created method desc 2 mypackage.Utils setItemTextColor, setItemTextColor(android.support.design.widget.BottomNavigationView,android.content.res.ColorStateList)
感谢您的帮助！
编辑：两个不同的颜色文件来自文件夹 Color
编辑 2：正如@tynn 所说，Android 数据绑定不知道资源类型。因此对于 Color 资源 @color 必须替换为 `@colorStateList。所以我做了更改，我的自定义 BindingAdapter 也已更新为接收 ColorStateList 而不是 int。问题是一样的
问题已解决：不需要自定义 BindingAdapter，因为数据绑定会根据每个 class 中现有的 setter 自动生成 setter（检查 Attribute Setters）。我的问题很奇怪，因为 R 文件，它生成得很糟糕。
您混淆了颜色和颜色状态列表。前者只是一个int，而后者应该是一个ColorStateList。在数据绑定 Expression Language 文档的末尾，您发现需要使用 @colorStateList 而不是 @color。 @color 也会产生颜色整数，而不是颜色资源。
对于您的适配器，您还必须使用不带命名空间的属性名称。
但最终在您的情况下，您只需设置 app:itemTextColor 和 app:itemIconTintList 而无需定义适配器。处理器将为您选择正确的设置器 setItemTextColor(ColorStateList) and setItemIconTintList(ColorStateList)。
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottomNavigationView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@{utils.lawyer ? @color/greyish_brown : @color/white}"
app:itemIconTintList="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:itemTextColor="@{utils.lawyer ? @colorStateList/nav_item_color_state_lawyer : @colorStateList/nav_item_color_state_user}"
app:menu="@menu/navigation" />