Intents in Kotlin

Question

So, I know that in Java we use this to launch new Activity

Intent intent = new Intent(this, SomeActivity.class); startActivity(intent); 

But I'm writting a project using Kotlin, so in Kotlin it's like

val intent = Intent(this,SomeActivity::class.java) startActivity(intent) 

But it crashes with problem

FATAL EXCEPTION: main Process: com.pashabred.passlin, PID: 15243                                                                            java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pashabred.passlin/com.pashabred.passlin.Enterring}: kotlin.KotlinNullPointerException     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)     at android.app.ActivityThread.access$800(ActivityThread.java:151)     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)     at android.os.Handler.dispatchMessage(Handler.java:102)     at android.os.Looper.loop(Looper.java:135)     at android.app.ActivityThread.main(ActivityThread.java:5254)     at java.lang.reflect.Method.invoke(Native Method)     at java.lang.reflect.Method.invoke(Method.java:372)     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)                                                                             Caused by: kotlin.KotlinNullPointerException     at com.pashabred.passlin.Enterring.onCreate(Enterring.kt:17)     at android.app.Activity.performCreate(Activity.java:5990)     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)     at android.app.ActivityThread.access$800(ActivityThread.java:151)      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)      at android.os.Handler.dispatchMessage(Handler.java:102)      at android.os.Looper.loop(Looper.java:135)      at android.app.ActivityThread.main(ActivityThread.java:5254)      at java.lang.reflect.Method.invoke(Native Method)      at java.lang.reflect.Method.invoke(Method.java:372)      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)  

Answer 1

Intents using Kotlin for Android are almost same we just need to change slight in the syntax as below.

val intent = Intent(this,HelloActivity::class.java) startActivity(intent) 

Exception that you are getting is null pointer exception in your onCreate method on the activity, please check the same..

Answer 2

Ensure you have (question mark):

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

Instead:

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