Binding data to Android in a submodule

Question

I have an application module, say, "Test." The Test module depends on submodule B. Both options provide data binding. In library module B, I create a simple action using data binding, its purpose is to reuse it, for example: I can create a basic login screen and use it in many applications later. The following is sample code in package B.

package com.test.packageb

      open class MainActivity : AppCompatActivity() {

        lateinit var binding : ActivityMainBinding

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        }
    }

and then in the Test module, I can simply inherit the MainActivity class to complete the setup, for example:

class MainActivity1 : MainActivity(){

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    fun doSomething(){
        binding.rootLayout.setBackgroundResource(R.color.colorPrimary)
    }
}

However, when I try to run the Test application, I got this error

: (17, 9)  'Com.test.packageb.databinding.ActivityMainBinding.  classpath
: (17, 17)   : rootLayout

? - , ?

build.gradle

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "com.test.testapplication"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    dataBinding{
        enabled true
    }

    buildTypes {
        debug {

        }
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    kapt 'com.android.databinding:compiler:3.0.0-beta4'
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:26.0.2'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.1', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation project(':packageb')
}

B build.gradle

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"


    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    dataBinding{
        enabled true
    }
    buildTypes {
        debug {
            minifyEnabled false
        }
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    kapt 'com.android.databinding:compiler:3.0.0-beta4'
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.0.2'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.1', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
}

Answer 1

, , - .

,

class A<BINDING extends ViewDataBinding> {
    protected ABinding binding;

    void init(){
        binding = (ABinding) DataBindingUtil.setContentView(this, R.layout.a);
    }
}

class B<ABinding> {
    // you can use instance in this class
}

, , . , .