Error:Could not find com.android.tools.build:gradle:3.0.0-alpha2
Searched in the following locations:
file:/User/3.0/android-studio/gradle/m2repository/com/android/tools/build/gradle/3.0.0-alpha2/gradle-3.0.0-alpha2.pom
https://jcenter.bintray.com/com/...
Required by: project
It is working fine with Android studio 2.3.
I have tried cleaning project, deleting build folder from the project, invalidate and restart.
What can I do?
Converting an android project to kotlin
This is a small write-up of my experiences from converting a native android-app from java to kotlin.
The first step is easy, android-studio will do most of the work for you. To convert the existing java code into kotlin, simply select the src/main/java folder in the project and choose Code->“Convert Java File to Kotlin File”. Android studio will then try as best as it can to convert all your java-code to kotlin-code.
Android studio will convert all your .java files into .kt files in-place, leaving them in src/main/java.
Your project will probably not compile now, because of differences in how java and kotlin handle #nullability.
nullability(.!!?) issues One of the big advantages kotlin has over java is the handling of nullability. By default, an object is non-nullable and has to explicitly specified to be nullable.
To use android-annotations, add the kotlin-kapt plugin to your build-script and add the android-annotations-dependency to the kapt-configuration:
...
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
...
dependencies{
...
kapt "org.androidannotations:androidannotations:4.3.1"
}
Include maven { url 'https://maven.google.com' } in your repositories sections:
buildscript {
repositories {
/* ... */
maven { url 'https://maven.google.com' }
}
}
repositories {
/* ... */
maven { url 'https://maven.google.com' }
}
If you use Gradle 4+, you can use google() instead.
