kotlinlang #android

Hi everyone 🙂 Was anybody able to use PowerMock + Kotlin + plain junit4 + backticks for all methods? For the first run everything was great but then nothing works again, javassist sometimes logs strange errors about bytecode or methods merely can’t be found by JUnit4TestRunnerXXX.., or Android Studio and even gradle task via console aren’t able to find any tests even if some test should be failed. I’m interested in backticks usage. It seems like transformation of such method to Java bytecode + bytecode manipulations of PowerMock break everything… I know that there is

test

channel but I think it’s can be more general problem. When for instance I have more than 10 tests written with backticks then nothing works (via gradle too) with the following error:

java.lang.IllegalStateException: Failed to transform class with name com.X.X.X.SenderTest. Reason: [source error] ) is missing

	at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:284)
	at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:192)
	at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass1(DeferSupportingClassLoader.java:77)
	at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:161)
	at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:48)
	at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:108)
	at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:71)

Caused by: compile error: ) is missing
	at javassist.compiler.Parser.parsePrimaryExpr(Parser.java:1250)
	at javassist.compiler.Parser.parsePostfix(Parser.java:1031)
	at javassist.compiler.Parser.parseCast(Parser.java:921)
	at javassist.compiler.Parser.parseUnaryExpr(Parser.java:886)

brainail

04/25/2018, 10:24 AM

I thought that at least Kotlin plus tests will work smoothly really but seems like such thing like backticks breaks everything in tests…

Ayden

04/26/2018, 9:39 AM

Most of them is Java.

adam-mcneilly

04/26/2018, 5:15 PM

Is it possible to call Kotlin function types via data binding in Android? https://stackoverflow.com/questions/50048645/calling-kotlin-function-type-from-databinding-android/50048646#50048646

jakubgruber

04/26/2018, 8:00 PM

Hi, does anyone faced following issue?

Detected problems with app native libraries 
(please consult log for detail):
libavcodec.so: text relocations
libswresample.so: text relocations

I do not use any native libraries. This happens on one screen on x86 device, so it's quite difficult to debug as I do not have one. I suspect Mobile Vision API or AWS SDK, but I use both in the latest versions. I found that in Android 7, they stopped allowing developers to linking to native libraries and therefore they need to pack application with libraries included, but I cannot influence what my libraries use. Any suggestions, please? :))

:stackoverflow: 1

rattleshirt

04/27/2018, 7:54 AM

Anyone who also ran into

SkeletonDatabase.java:7: error: android.arch.persistence.room.RoomProcessor was unable to process this class because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.

in a module with AS 3.1.1, kotlin 1.2.40, gradlew 4.7, room 1.1.0-beta3, android gradle plugin 3.1.1? Already tried to downgrade versions but without any luck. It doesn’t look similar to the embeddable issue that was posted earlier.

wilyarti

04/28/2018, 3:15 PM

I have figured out the above issue by running intensive loads on a CommonPool thread. This has caused another issue. Because the Callback from my .aar file is on a CommonPool thread I can't use the Callback to update the UI. So is there a way to shuffle the Callback into the UI thread via some kind of function?

r-z

04/28/2018, 3:22 PM

I've got a fragment and I'm trying to get the dimensions of an Image view inside that fragment as soon as the fragment is loaded, but I keep getting 0*0. Any hints on how this could be done?

:stackoverflow: 3

Ravi.Rajjak

04/28/2018, 4:17 PM

I just want to set adapter in recylerview . But app is getting crashed and no log is found

Ana Stu

04/29/2018, 2:18 PM

call.enqueue(new Callback<List<Task>>() { @Override public void onResponse(Call<List<Task>> call, Response<List<Task>> response) { if (response.isSuccessful()) { // tasks available } else { // error response, no access to resource? } } @Override public void onFailure(Call<List<Task>> call, Throwable t) { // something went completely south (like no internet connection) Log.d("Error", t.getMessage()); } }

Andrea

04/30/2018, 9:01 AM

hey guys I'm having a problem that I'm not able to understand

:stackoverflow: 1

Andrea

04/30/2018, 9:01 AM

is there someone that can help me online?

:stackoverflow: 1

Andrea

04/30/2018, 9:09 AM

FATAL EXCEPTION: main Process: com.example.utente.lets_appv0, PID: 8477 java.lang.IllegalArgumentException: Capacity: -8

:stackoverflow: 1

Andrea

04/30/2018, 9:12 AM

I'm devolping an application that connects via bluetooth to PCB and plot in real time an acquired ECG. While navigating back to my main activity and going again to the monitoring activity the application crashes with this error

:stackoverflow: 7

👎 1

wilyarti

04/30/2018, 1:58 PM

I wrote a quick overview of what I learned getting Go working with Kotlin utilising callbacks and coroutines: https://clinetworking.wordpress.com/2018/04/30/building-a-kotlin-android-app-with-go-logic/ I also created an example app which is linked in the blog post for those who want to get started quickly. Happy to hear any feed back. My main goal is to help someone else get started easier.

👏 3

Erfan

05/01/2018, 12:14 PM

Guys how do I add

volley

to my project in Android Studio 3.1.2? I try with

implementation 'com.android.volley:volley:1.1.0'

but it fails with the following errors:

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.volley:volley:1.1.0.
Open File
Show Details


Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.volley:volley:1.1.0.
Open File
Show Details


Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.volley:volley:1.1.0.
Open File
Show Details


Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.volley:volley:1.1.0.
Open File
Show Details


Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.volley:volley:1.1.0.
Open File
Show Details

jakubgruber

05/02/2018, 7:26 AM

Hi guys, it’s not 100% Kotlin question, but does anyone have experience with using elliptic curve keys in Android below API 23? I cannot import the keys that I generated outside a keystore into the keystore and therefore I tried to generate them directly in there. Unfortunately, I found out that Android does not support EC for API below 23. Any suggestion how to overcome this issue, please?

:stackoverflow: 4

Sudhir Singh Khanger

05/02/2018, 7:40 AM

private lateinit var movieAdapter: RecyclerView.Adapter<*>
private lateinit var movieAdapter: MovieAdapter

What is the difference between declaring type as the exact class of name

MovieAdapter

and

RecyclerView.Adapter<*>

? Also what does it mean by the asterix

<*>

? Which one is better?

Imran

05/02/2018, 5:27 PM

Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath: unresolved supertypes: rx.Observer, Can anyone please guide me where i am wrong or miss something

Imran

05/03/2018, 7:59 AM

yes i have added all the dependency related to RXJava and RXAndroid but don't know where this error pointing out

05/03/2018, 7:45 PM

this isn't kotlin-related

orangy

05/03/2018, 8:05 PM

This entire Slack is about Kotlin…

☝️ 3

:kotlin: 11

05/03/2018, 9:32 PM

If the name of the slack organization doesn't stop people from going off topic, I'm not convinced a channel name would either.

and this conversation is evidence of that! (needs #meta)

🤣 1

ghosalmartin

05/04/2018, 10:30 AM

i mean youd assume the slack group name was name spacing it, kotlinlang-android

neuber

05/04/2018, 12:20 PM

https://github.com/neuberfran/Marvel/tree/master/erros

Jimmy Alvarez

05/04/2018, 8:28 PM

hello guys, I'm a tester and I'm facing a very good opportunity to jump to android development. I have experience programming but actually I want to learn the basics of android, any one here has a book that help me understand android development but in kotlin off course

Slackbot

05/05/2018, 5:46 PM

This message was deleted.

😂 1

:trollface: 2

👎 2

:stackoverflow: 4

Davor Maric

05/05/2018, 11:38 PM

Hey guys.. anyone else facing this problem with kotlin-kapt? https://issuetracker.google.com/issues/74537216

➕ 1

spierce7

05/06/2018, 2:55 AM

I don't find Kotlin class delegates very useful. I've found many uses for property delegates, but I have never found the class delegation in Kotlin to be what I needed. I've been programming in Kotlin for almost 4 years, and haven't used it once. Has anyone found it to be useful, and can they explain how they use it?

Title

spierce7

05/06/2018, 2:55 AM

drofwarcs

05/06/2018, 3:15 AM

I also have a hard to finding a good use for this feature. In my case, its turns out that this feature is really a form of the Decorator pattern instead of just a plan delegate pattern, which is why the class thats using

by

must also conform to the interface. If there was a similar kotlin feature like this that did not implement/conform the interface methods in the class using

by

, I would be using this like crazy. The current way it works comes in handy for places where you would use the decorator pattern.

pankajrai

05/06/2018, 4:12 AM

Yes it is extremely useful for example by lazy delegate which does object initialization when its used for the first time thereafter directly use its value. Observer/Vetoable are great way to observer value and restrict what value should be assigned to an object.

lazy initialization make your object immutable that means no overhead included to allocate space for variable memory as its value never change

trevjones

05/06/2018, 4:19 AM

I typically only use it as a way to reduce code duplication around things like rx disposable management or viewholder code where a custom view isn’t any more appropriate. ie)

Foo(...): DisposeBucket by DisposeBucket.Impl()

👍 1

kenkyee

05/06/2018, 10:16 AM

Why wouldn't you use it for class composition?

rkeazor

05/06/2018, 3:04 PM

I found it useful

It favors composition over inheritance. I think the problem most people have , is that they are used to the inheritance model so its can be somewhat weird to wrap your head around

👍 2

in essence you can delegate the actual implmentation of Object. so for instance, in a normal MVP(passive view flavor) architecture you would have a interfaces that seperate the layer of abstraction between the presenter and Activity. However you would have to have the actual implementation as a instance variable

in both the activity and the presenter. but class delegation removes this need

The only downside I see with it , was perhaps the same downside you get from Multiple inheritance, and default methods..Is that if you do it to much you don’t know where things are coming from lmaoo

but i think its a cool feature

spierce7

05/06/2018, 7:26 PM

Every time I use it, I find it's limitations crippling. I've seen 2 uses for it 1. When I want to delegate all methods from an interface to another class, but then I'm asking myself why am I not just extending the class, since this 95% of the time, the class definitely won't be extending anything else. I agree learned to favor composition over inheritance, but the limitations of the class delegate in Kotlin have ensured that I can't use it for that in all the instances I've come across. 2. If I split an interface into multiple smaller interfaces, and then kind of patched implementations together of the implementations using the class delegates. I could see it useful for this, effectively using this as a decorator pattern of some sort. I'm not sure if this would actually work well though. I'm sure it is useful, I just haven't seen a way that I've found it to be useful. I'm confident that if someone showed me a real example of how its been useful for them it would probably grow me as a programmer, as I think it's likely there is just a mental block there now.

rkeazor

05/06/2018, 11:52 PM

yea you can extend it, but remember Java and Kotlin favor single Inheritance.So if you have a class that extends a base class, and you want to inherit from another class as well, you will have to create a instance variable of that class

louiscad

05/08/2018, 8:04 AM

I found a very compelling use case for it on Android that also involves companion objects. I'll share it back here this week (or maybe today)

Here's what you can do with interface implementation delegates, companion objects, and reified type parameters for Android

spierce7

05/21/2018, 2:23 PM

louiscad

05/21/2018, 2:45 PM

Oh… silly me, forgot the link… Here it is: https://github.com/LouisCAD/Splitties/blob/master/intents/README.md @spierce7 Feel free to jump straight to the example

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