Can't Get Android Two-way Data Binding To Work (intellij Idea)

I am facing a problem where I can't get two-way data binding to work in IntelliJ IDEA. One-way binding works fine. Here is my setup: IntelliJ IDEA Ultimate 2016.2.1 Android API: 2

Solution 1:

For the attribute android:text databindings try to call some getText() on the EditText expecting a return type of String. But since it returns a CharSequence you have to define this getter yourself.

@InverseBindingAdapter(attribute = "android:text")
publicstaticStringcaptureTextValue(TextView view) {
    return view.getText().toString();
}

Solution 2:

I figured it out, based on the info from these slides:

http://www.slideshare.net/radekpiekarz/deep-dive-into-android-data-binding

1. In the project's top-level build.gradle file, gradle:2.1.0 or above is needed. I had it set to gradle:2.0.0, even though I had the latest version installed. I am guessing this is the Android Gradle plugin version that @CommonsWare is referring to. Here is my corrected top-level build.gradle:

   buildscript {
       repositories {
           jcenter()
       }
       dependencies {
           classpath 'com.android.tools.build:gradle:2.1.0'
       }
   }
   
   allprojects {
       repositories {
           jcenter()
       }
   }
   
   task clean(type: Delete) {
       delete rootProject.buildDir
   }
   

2. After fixing the gradle version, IntelliJ IDEA still highlights the syntax as error, but the project compiles fine. However, the two-way data binding itself still did not work. To fix that part, I added notifyPropertyChanged(BR.name) to the name property setter in the Customer class:

   publicclassCustomerextendsBaseObservable {
       privateString name;
       private int age;
   
       @BindablepublicStringgetName() {
           return name;
       }
   
       publicvoidsetName(String name) {
           this.name = name;
           notifyPropertyChanged(BR.name);
       }
   
       @Bindablepublic int getAge() {
           return age;
       }
   
       publicvoidsetAge(int age) {
          this.age = age;
       }
   }
   

After this, the binding works as expected - I did not need to add any extra adapters or more code.