I am getting started for using DataBinding and something is wrong with my onClick.
GameViewModel.java
public void onClickItem(int row, int col){
Log.d("click","row: "+row+" col: "+col);
}
@BindingAdapter("load_image")
public static void loadImage(ImageView view,int imageId) {
view.setImageResource(getDrawable(imageId));
}
GameFragment.java
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//View view=inflater.inflate(R.layout.fragment_game, container, false);
FragmentGameBinding binding = DataBindingUtil.inflate(inflater, R.layout.fragment_game, container, false);
View view = binding.getRoot();
ButterKnife.bind(this,view);
binding.setGameViewModel(gameViewModel);
gameViewModel= ViewModelProviders.of(getActivity()).get(GameViewModel.class);
gameViewModel.init();
return view;
}
fragment_game.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=".view.GameFragment">
<data>
<import type="android.support.v4.app.Fragment"/>
<import type="android.view.View"/>
<variable
name="gameViewModel"
type="harkor.addus.viewmodel.GameViewModel" />
</data>
<android.support.constraint.ConstraintLayout
(...)>
<TextView
(...)>
<android.support.constraint.ConstraintLayout
(...)>
<ImageView
android:id="@+id/image_puzzle11"
android:src="@android:color/holo_green_dark"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginEnd="1dp"
android:layout_marginRight="1dp"
android:onClick="@{() -> gameViewModel.onClickItem(1,1)}"
app:load_image="@{0}"
app:layout_constraintBottom_toTopOf="@+id/image_puzzle21"
app:layout_constraintDimensionRatio="w,1:1"
app:layout_constraintEnd_toStartOf="@+id/image_puzzle12"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
(...)
load_image is working, but onClick do nothing... No error in compilation, no crash when button is clicking on device, no result in console...
答案 0 :(得分:2)
请检查以下代码:
您已写为,以点击图片点击为:
android:onClick="@{() -> gameViewModel.onClickItem(1,1)}"
尝试编写如下内容,然后再次检查:
android:onClick="@{(v) -> gameViewModel.onClickItem(1,1)}"
根据指导这不是实现我们可以按照MVVM体系结构进行以下工作的体系结构原理的方法: 1.创建一个界面 2.将界面定义为布局文件中的处理程序,如下所示:
<variable
name="handler"
type="com.cityguide.interfaces.MustVisitItemListener"></variable>
3。现在,我们使用此处理程序将onclick定义为:
android:onClick="@{(v) ->handler.onGalleryItemClick(v,currentPosition,photo)}"
private MustVisitItemListener mItemListener;
mItemListener =新的MustVisitItemListener(){};
5。使用绑定对象设置接口处理程序,如下所示:
mbinding.setHandler(mItemListener);
答案 1 :(得分:0)
最简单的方法是设置视图模型,并在布局的View的onClick中调用适当的方法: 您的xml:
<data>
<variable
name="myHandlers"
type="co.package.MyHandlersListener" />
</data>
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/my_id"
android:layout_width="@dimen/full_width"
android:layout_height="wrap_content"
android:onClick="@{() -> myHandlers.doSomething()}" />
但是,如果出于任何原因需要从片段或活动中调用方法,则最好的建议是创建一个接口来处理该方法,实现该方法并将其设置为如下所示的布局: 您的xml
/* My Handler Methods */
interface MyHandlersListener {
fun doSomething()
}
然后在您的Fragment或Activity中创建接口,然后实现它: 您的活动/片段:
private val myHandlersListener: MyHandlersListener = object : MyHandlersListener {
override fun doSomething() {
something()
}
}
然后,在考虑到方法 某物 已在您的活动/片段类中定义和实现的情况下,实现监听器:
myBinding.myHandlers = myHandlersListener
使用数据绑定,您可以将处理程序设置到布局类中(这可以在 onCreate 或 onCreateView 方法中完成,具体取决于您使用的是Activity还是fragment分别):
conda install
通过这种方式,它可以完美运行,并且您遵循Android团队提供的指南: https://developer.android.com/topic/libraries/data-binding/expressions#method_references