I want to convert my java project to Kotlin, there are more than 500 java files. How can I convert it into Kotlin easily?
I know that we can convert one by one java file to Kotlin, But there are many files.
Can I convert it at once?
You can definitely try. You just need to select a module or a folder in the Project navigator and select Code --> Convert Java file to Kotlin file:
You, though, need to keep in mind that the conversion is not perfect. For instance, Android Studio will have to guess whether a whole lot of properties are nullable or not. It will not get them all right... you will get a lot of crashes.
My suggestion would be to batch files in sensible chunks, so you can fix those Kotlinized files without getting swamped with errors.
Note: after converting a file to Kotlin you still will need to review it. A lot of things will be kept in Java for the sake of safety, but now that you have Kotlin you can use collection extensions, default constructor parameters, ...
Select your app folder and go to Code Convert Java File to Kotlin File
Then after you convert the file,it says kotlin not configured.Click the Configure text then select the type of module you want to apply kotlin and it comes with the latest kotlin version press ok
N.B After you convert the code,you must convert some parameters that the compiler found it as a warning or error message.
It's easy, android-studio will do most of the work for you. To convert the existing javacode 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.
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The application I use (https://github.com/dangbo/ncnn-mobile.git) use a native library that gives out inference result as a tag. I need it to give me a float array from which it knows the tag. The array is already implemented in the C++ files, but changing them does not effect the application itself. I would not mind if the array was written into a string, I just need the numbers in a readable format. However, the method is native and thus I do not know how to modify this behavior.
I use the newest versions of Android Studio and NCNN. Please advise.
Simply use ndk-build on the jni folder for building.
I'm exploring Kotlin through Kotlin for Android Developers. One of the first steps is to use Convert Java File to Kotlin File to see how the Java and Kotlin files compare.
I'm curious how this feature works.
Is the tool creating an abstract syntax tree from the Java input then transpiling to Kotlin? Or is doing something much simpler?
The tool uses the IntelliJ IDEA PSI interface to parse and analyze the Java source code and then converts the resulting tree into Kotlin text. It's open-source just like everything else related to Kotlin; you can find the implementation here.
I have maybe strange question, but would be appreciate if someone helps.
I need to merge all the code from classes ( which are part of the packages ) in one text or class file for Android project in Android Studio.
So I have for example such a structure
And I need to merge the code from NewAlbumDialog, MenuAdapter, MenuItem etc classes in one big file.
Maybe somebody know how can I do it with the Android Studio.
Would be appreciate your help.
I don't think there is a tool for this. Just use a text editor.
However be aware that a Java file is not valid as soon as it includes more than one public class - see Multiple classes in single file
I'm a newbie to Android development and I was wondering if I could create a serialized file (or any file) by a non-Android program and then just move it into an Android project in Eclipse and read it there? Any help would be appreciated! Thanks!
As long as you've got the proper de-serialization code on the android side, yes. There shouldn't be any issue here.
See:
Java serialization - Android deserialization
For potential pitfalls.
First of all I'd like to mention I am very new to Java programming. This Android project is my first experience with Java. So for one task I need to strip HTML tags from a string. I was thinking about using this answer Remove HTML tags from a String to do this task. In order to do this I need to be able to import javax.swing.text.html.* and javax.swing.text.html.parser.*.
I went to the properties of my project and attempted to add this library to my project. I read that this was included in the rt.jar file which was located at /usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar
I was able to use the imports but it seems like it added a million libraries I am not using. Will this negatively effect my application? What is the correct way to add just the one extension?
You don't. Android doesn't use Swing. You'll need to use Android's API to create your UI and perform text parsing. Consider android.text.Html as a simple way to strip HTML from a string.