abreslav / AndroidDemoIn4Languages

Comparison between Java, Groovy, Scala, Kotlin in Android Development.

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AndroidDemoIn4Languages

A simple Android application written in Java, Groovy, Scala and Kotlin in order to find out what is the better language for Android development.

How to Compare?

Only import the minimal dependencies.

Dependence Report

• In Java
  • Import com.android.support:appcompat-v7:23.1.1
• In Groovy
  • Import com.android.support:appcompat-v7:23.1.1
  • Import org.codehaus.groovy:groovy:2.4.5:grooid
  • Import org.codehaus.groovy:groovy-json:2.4.5
• In Scala
  • Import com.android.support:appcompat-v7:23.1.1
  • Import org.scala-lang:scala-library:2.11.7
  • Import org.scaloid:scaloid_2.11:4.0
• In Kotlin
  • Import com.android.support:appcompat-v7:23.1.1
  • Import org.jetbrains.kotlin:kotlin-stdlib:1.0.0-beta-4584

Analysis Report

Line Counter

Language	Files	Blank Lines	Comment Lines	Code Lines
Java	3	22	0	165
Groovy	3	23	9	140
Scala	3	25	9	110
Kotlin	3	23	9	133

Size Counter

Language	Disable Proguard (bytes)	Enable Proguard (bytes)
Java	1,220,887	654,906
Groovy	2,934,236	1,674,177
Scala	over 65536 methods	1,190,188
Kotlin	1,602,041	697,290

Build Speed

Language	Gradle Plugin	Spend (secs)
Java	2.0.0-alpha7	≈ 35
Groovy	2.0.0-alpha7	> 120
Scala	1.3.1	> 160
Kotlin	1.3.1	≈ 45

Method Counter

Language	Disable Proguard	Enable Proguard
Java	164,60	6,421
Groovy	46,055	23,112
Scala	over 65536 methods	19,388
Kotlin	24,061	6,559

Coding Comparison

Find View

Java

TextView title = (TextView)view.findViewById(android.R.id.text1);

Groovy

def title = view.findViewById(android.R.id.text1) as TextView

Scala

val title = view.findViewById(android.R.id.text1).asInstanceOf[TextView]

Kotlin

val title = view.findViewById(android.R.id.text1) as TextView

OnClickListener

Java

button.setOnClickListener(new View.OnClickListener() {
    @Override
    void onClick(final View v) {
      //  do something
    }
})

Groovy

button.onClickListener = {
    //  do something
}

Scala

button.onClick((v: View) =>
    //  do something
)

Kotlin

button.setOnClickListener {
    //  do something
}

Callback

Java

public interface FindCallback {
    void onFinish(List<String> results, Exception e);
}
private void findCountries(FindCallback doneCallback) {
    try {
        //  a long time mission
        doneCallback.onFinish(results, null);
    } catch (Exception e) {
        doneCallback.onFinish(null, e);
    }
}
findCountries(new FindCallback(){
    void onFinish(List<String> results, Exception e){
      //  handle result
    }
});

Groovy

def findCountries(Closure doneCallback) {
    try {
        //  a long time mission
        doneCallback(results, null)
    } catch (e) {
        doneCallback(null, e)
    }
}
findCountries{ List<String> results, Exception e ->
  //  handle result
});

Scala

def findCountries(doneCallback: (ArrayBuffer[String], Exception) => Unit):Unit = {
    try {
        //  a long time mission
        doneCallback(results, null)
    } catch {
        case e: Exception => doneCallback(null, e)
    }
}
findCountries((names: ArrayBuffer[String], e: Exception) =>
  //  handle result
)

Kotlin

fun findCountries(doneCallback: (List<String>?, Exception?) -> Unit) {
    try {
        //  a long time mission
        doneCallback(results, null)
    } catch (e: Exception) {
        doneCallback(null, e)
    }
}
findCountries{ list, e ->
  //  handle result
}

Community Support

• Java Native Support
• Groovy Official Support
• Scala No Support
• Kotlin Official Support

Conclusion

The futher comparasion to be continue...