How to use kotlin.Int in databinding?

问题

I wrote a layout xml like below. But the Kotlin compiler says Cannot resolve symbol 'Int'

main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<layout ...>
  <data>
    <import type="androidx.databinding.ObservableArrayMap" />
    <variable
      name="myList"
      type="ObservableArrayMap&lt;Int,String&gt;" />
  </data>

<!-- ...... -->    

</layout>

Is it possible to use kotlin builtins in android databinding xml?

回答1:

Use java Integer instead of kotlin Int.
You can not use characters <,> etc in XML. So use HTML entities.

ObservableArrayMap&lt;Integer,String&gt;

回答2:

You can add data binding simple way.

Configure your app to use the data binding:

Open the app/build.gradle, Then you have to add these line of code inside the android tags in gradle and sync project

dataBinding {
    enabled = true
}

Layout and Binding Expression in Data Binding:

Open the layout (XML) file activity_main and replace the root with layout tag and place all tags inside to layout tags.

<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

<RelativeLayout>

<layout>

Replace the traditional setContentView() to DataBindingUtil.setContentView() in Activity:

public class MainActivity extends AppCompatActivity {
ActivityMainBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
   }
}

Let’s us see how to data bind with Views and Widget using data binding

 binding.tvName.setText("Monika Sharma");
 binding.tvAddress.setText("251 mansarovar Jaipur | India ");
 binding.tvFollowers.setText("240K");
 binding.tvfollowing.setText("324K");

来源：https://stackoverflow.com/questions/53113356/how-to-use-kotlin-int-in-databinding

标签

android

kotlin

android-databinding