I am using the latest data binding in android using android studio 2.1.
using the visibility tag as describe in the below code getting an error as
java.lang.RuntimeException: Found data binding errors.
/ data binding error ****msg:Identifiers must have user defined types from the XML file. View is missing it
file:D:\HP\HealthPortal_Android\Code\app\src\main\res\layout\cardview_image_twotextview.xml
loc:68:90 - 68:93
\ data binding error
<TextView
android:id="#+id/card_sub_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/card_title"
android:layout_marginLeft="#dimen/carview_margin"
android:layout_toRightOf="#+id/card_image"
android:text="#{toolsAndTrackersCards.subtitle}"
android:textColor="#color/black"
android:textSize="20sp"
android:visibility="#{toolsAndTrackersCards.subtitle.equals(#string/Empty_String) ? View.VISIBLE : View.GONE}"
/>
Done some google not abel to find the solution. The #string/Empty_String is define as empty string "" in string.xml file. where I am doing wrong.
Android data binding, Radio Button not updating
Add this to your cardview_image_twotextview.xml:
<data>
<import type="android.view.View" />
<!--your variables-->
</data>
To hide a view if the string is empty, use the below expression in data binding
<data>
<import type="android.view.View"/>
<variable
name="item"
type="com.test.model.Item" />
</data>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#{item.title}"
android:visibility='#{item.title.equals("") ? View.GONE : View.VISIBLE}'/>
NOTE: need to use outer single quote string in order to use double quote to
represent the empty string
If you want to check for null and empty, use the below code :
<data>
<import type="android.view.View"/>
<import type="android.text.TextUtils"/>
<variable
name="item"
type="com.test.model.Item" />
</data>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#{item.title}"
android:visibility="#{TextUtils.isEmpty(item.title) ? View.GONE : View.VISIBLE}"/>
Zero or more import elements may be used inside the data element.
These allow easy reference to classes inside your layout file, just
like in Java.
you need to import View class inorder to use its properties.
<data>
<import type="android.view.View"/>
</data>
you can also refer official DataBinding guideline.
Related
val inputUnderLineColor = MutableLiveData(R.color.red2)
app:backgroundTint="#{viewModel.inputUnderLineColor}"
I want to set the EditText UnderLine color value depending on the state, but I get the following error
Cannot find a setter for <android.widget.EditText app:backgroundTint> that accepts parameter type 'androidx.lifecycle.MutableLiveData<java.lang.Integer>'
How do you solve this ??
You can use it like below ContextCompat.getColor()
<layout>
<data>
<import type="android.support.v4.content.ContextCompat"/>
<variable name="viewModel" type="com.example.myapp.yourObject" />
</data>
...
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#{data.text}"
android:textColor="#{ContextCompat.getColor(context, viewModel.inputUnderLineColor)}" />
</layout>
1. Make sure to import ContextCompat as shown above.
2. You can automagically 'context' as a method parameter for ContextCompat.getColor() because it will be automatically resolved to the view's context.
I want my view visibility to be dependent on condition behaviour so I am using ObservableField and with databinding trying to change view visibility but getting issue like "Identifiers must have user defined types from the XML file. InputType is missing it"
Code:
Kotlin File
var showView: ObservableField<Boolean>? = ObservableField(false)
//API call response
showView.set(true)
Layout File:
<TextView
android:id="#+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="#{viewModel.showView ? View.VISIBLE : View.GONE}"/>
How to apply databinding with Observablefield of type boolean? I have used it for string text also and it's working but not working with boolean conditional statement.
I am not sure if that's the case here, but this error message is usually displayed when you reference a type in your binding expressions that hasn't been declared in the <data> section of your layout. The same way you declare the View type as an import, you should declare the type InputType.
<data>
<!-- Maybe an import for InputType is missing here? -->
<import type="android.view.View" />
<variable
name="viewModel"
type="com.yourpackage.YourViewModel"/>
</data>
I have a view that uses DataBinding to display data from a ViewModel. The view has a button that is hidden when the view is in landscape mode. At the moment this works by having two layoutfiles, but I would like to only have one as it's a nightmare to refactor. But how to go about this using DataBinding and BindingAdapters?
How do you enable the following bindingexpression for a given view?
android:visibility="#{isLandscapeMode ? View.INVISIBLE : View.VISIBLE}"
EDIT:
My extension property definition (ViewUtils.kt):
val View.isLandscapeMode: Boolean
get() = resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
And my layout:
<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">
<data>
<import type="android.view.View"/>
<import type="com.example.base.views.ViewUtilsKt" />
<variable
name="isLandscapeMode "
type="java.lang.Boolean"/>
<variable
name="viewmodel"
type="com.example.ui.task.TaskViewModel" />
</data>
...
<ImageButton
...
android:visibility="#{isLandscapeMode ? View.INVISIBLE : View.VISIBLE}"
...
/>
This causes a compile error: Cause: not a valid name: isLandscapeMode
You have to check in your binding adapter which phone orientation is currently on. Here is another post where you can find answer to your question how to detect orientation of android device?
EDIT:
You need to detect orientation and save it as boolean value. Later you have to pass that variable to your adapter which in this case will be boolean.
<data>
<import type="android.view.View"/>
<variable
name="isLandscapeMode"
type="boolean"/>
</data>
For others if they need same behavior. There are two solutions.
First solution (create a BindingAdapter and use it on the UI element of your choice):
#BindingAdapter("bind:visibleInLandscapeMode")
fun View.setVisibleInLandscapeMode(visible: Boolean) {
Timber.d("setVisibleInLandscapeMode() returns ${resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE}")
visibility = if (visible && (resources.configuration.orientation != Configuration.ORIENTATION_LANDSCAPE)) VISIBLE else INVISIBLE
}
In your XML layout:
<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"
xmlns:bind="http://schemas.android.com/apk/lib/com.example">
...
<ImageButton
...
bind:visibleInLandscapeMode="false"
...
/>
Second solution (create a bindingexpression that changes the visibility of the UI element):
<ImageButton
...
android:visibility="#{context.getResources.getConfiguration.orientation == Configuration.ORIENTATION_LANDSCAPE ? View.INVISIBLE : View.VISIBLE}"
...
/>
Remember the correct imports:
<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">
<data>
<import type="android.view.View"/>
<import type="android.content.res.Resources" />
<import type="android.content.res.Configuration" />
...
</data>
...
Btw. be careful when using Databinding with AndroidAnnotation. See issue here and here.
In my task app I want to use databinding for the task overview. I've grouped tasks in three categories: overdue, today and future.
My task_overview.xml defines the following viewmodel (which contains three arraylists with the different tasks)
<data>
<variable
name="viewModel"
type="de.taskapp.ui.taskOverview.viewmodel.TaskOverviewViewModel" />
</data>
A few steps later I include the layout for the three task lists with the include tag like this
<include layout="#layout/layout_task_list"
android:id="#+id/overdued_tasks_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#id/headline"/>
<include layout="#layout/layout_task_list"
android:id="#+id/todays_tasks_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#id/overdued_tasks_list"/>
<include layout="#layout/layout_task_list"
android:id="#+id/future_tasks_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#id/todays_tasks_list"/>
It would be awesome if I could do something like this to pass the different lists from the viewmodel to the layout_task_list.xml via the include tag
app:entries="#{viewModel.todaysTasks}" // for the todays task list case
My layout_task_list.xml looks like this
<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">
<data>
<variable
name="tasks"
type="android.databinding.ObservableArrayList" />
</data>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.AppCompatTextView
android:id="#+id/subheading"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/SubheadlineWithBackground"
tools:text="Heute"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/task_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/spacing_large"
android:layout_marginRight="#dimen/spacing_large"
android:nestedScrollingEnabled="false"
app:entries="#{tasks}" //recyclerviewbinding is already there
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_constraintTop_toBottomOf="#id/subheading"/>
</android.support.constraint.ConstraintLayout>
As you may suggest...the code is not working. This error message is shown
data binding error ****msg:Cannot find the setter for attribute 'app:entries' with parameter type android.databinding.ObservableList<de.taskapp.data.entity.Task> on de.molske.einfachmachen.databinding.LayoutTaskListBinding. file:/Users/app/src/main/res/layout/layout_task_overview.xml loc:38:40 - 38:60 ****\ data binding error ****
Okay yeah its telling me that he cannot find the setter for app:entries...but isn't there a "beautiful" way to pass the three lists to the three include-layouts? I don't like the idea to copy and paste the same layout three times just to be able to pass the different lists.
Thanks in advance.
(ps.: I know that there is the possibility to solve this by java / android code but I would like to know if there is a databind way to do this ;-)
Okay, classic me. After a few more googling I found the solution. Adding the next lines to the data-section of the included file everything works fine!
<import type="java.util.List"/>
<import type="de.molske.einfachmachen.data.entity.Task"/>
<variable name="title" type="java.lang.String"/>
<variable
name="tasks"
type="List<Task>"/>
It seems that it's important to define the exact type of the tasks variable. Because its type is a genereic < and > instead of < and > for defining the type.
Have two complex layouts and one is included into another.
Trying to pass list of some custom objects into included layout, but build fails with following error:
Error:Execution failed for task ':core:compileDebugJavaWithJavac'.
> java.lang.RuntimeException: Found data binding errors.
****/ data binding error ****msg:cannot find type element for List
file:D:\myproject-android\core\src\main\res\layout\view_header.xml
loc:101:27 - 101:42
****\ data binding error ****
view_header.xml:
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:bind="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="vm"
type="com.catalogz.app.ui.categories.ItemViewModel" />
</data>
<FrameLayout>
<include layout="#layout/include_title_view" bind:items="#{vm.items}/>
</FrameLayout>
...
</layout>
include_title_view.xml:
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<import type="com.catalogz.app.utils.Strings" />
<import type="com.catalogz.app.app.entities.Item" />
<import type="java.util.List"/>
<variable
name="items"
type="List<Item>" /> <!-- generic List<Item> -->
</data>
<TextView android:text="#{Strings.convert(items)}"/>
</layout>
It's possible to move this problem from view_header.xml to include_title_view.xml by removing generic definition <Item> but then it appears in the Strings.convert(items) call as methods expects a list of Item and layout passes List<Object> as I understand:
Error:Execution failed for task ':core:compileDebugJavaWithJavac'.
> java.lang.RuntimeException: Found data binding errors.
****/ data binding error ****msg:cannot find method convert(java.util.List) in class com.catalogz.app.utils.Strings
file:D:\myproject-android\core\src\main\res\layout\include_title_view.xml
loc:51:32 - 51:61
****\ data binding error ****
I also have the same problems, but I found an alternative for setting the value inside the included layout. I know it is not a good practice, at least it is the work around for the setting variable for the include layout with data binding.
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:bind="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="vm"
type="com.catalogz.app.ui.categories.ItemViewModel" />
</data>
<FrameLayout>
<include
android:id="#+id/part1"
layout="#layout/include_title_view" />
</FrameLayout>
...
</layout>
In Activity class
ActivityMainBinding.part1.setItems(myItems);
Hope this can be helpful.