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[英]data binding not getting “Identifiers must have user defined types from the XML file” error
[英]Android Data binding - Error:(119, 29) Identifiers must have user defined types from the XML file. main_radio_subscribe is missing it
我一直试图使用android数据绑定中的隐式属性监听器( 引用 )来控制视图的可见性,它允许通过id和访问属性(如checked,visible等)访问视图,但是当尝试使用它时,它会抛出像这样的错误
Error:(119, 29) Identifiers must have user defined types from the XML file. addTodo_switch_remind is missing it
<android.support.v7.widget.SwitchCompat
android:id="@+id/addTodo_switch_remind"
style="@style/MediumTextViewStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addTodo_space_project"
android:text="@string/add_todo_remind_label"
android:textOff="@string/generic_no_text"
android:textOn="@string/generic_yes_text" />
<android.support.v4.widget.Space
android:id="@+id/addTodo_space_remind"
style="@style/FormsSpacingStyle"
android:layout_below="@+id/addTodo_switch_remind" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/addTodo_space_remind"
android:orientation="vertical"
android:padding="@dimen/grid_box_single"
android:visibility="@{addTodo_switch_remind.checked ? View.VISIBLE : View.GONE}">
当您在.xml文件中使用View.VISIBLE
/ View.GONE
时,您应该通过在数据部分中添加<import type="android.view.View"/>
来导入View
类型,如下所示:
<data>
<import type="android.view.View"/>
<variable
name="viewModel"
type="xx.xx.MyViewModel"/>
</data>
看起来隐式属性侦听器在表达式中使用驼峰的情况下,感谢这篇文章我想出来了。
<!--Recurring Reminder -->
<android.support.v7.widget.SwitchCompat
android:id="@+id/addTodo_switch_remind"
style="@style/MediumTextViewStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addTodo_space_project"
android:text="@string/add_todo_remind_label"
android:textOff="@string/generic_no_text"
android:textOn="@string/generic_yes_text" />
<android.support.v4.widget.Space
android:id="@+id/addTodo_space_remind"
style="@style/FormsSpacingStyle"
android:layout_below="@+id/addTodo_switch_remind" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/addTodo_space_remind"
android:orientation="vertical"
android:padding="@dimen/grid_box_single"
android:visibility="@{addTodoSwitchRemind.checked ? View.VISIBLE : View.GONE}">
记录具有相同问题的其他人
第1步 :创建BindingAdapter :
@BindingAdapter("android:visibility")
public static void setVisibility(final View view, @IdRes int layourId) {
SwitchCompat switcher = (SwitchCompat)view.getRootView().findViewById(layourId)
switcher.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
view.setVisibility(isChecked ? View.VISIBLE : View.GONE);
}
}
}
第2步 :在layout.xml中的数据绑定数据部分导入R
类:
<data>
<import type="example.package.R"/>
</data>
第3步 :将自定义视图绑定到切换台,如下所示:
<android.support.v7.widget.SwitchCompat
android:id="@+id/addTodo_switch_remind"/>
<LinearLayout
android:visibility="@{R.id.addTodo_switch_remind">
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