However I want to know if there is still a way to achieve this and be able to assign values to it. : Unable to start activity ComponentInfo: : BlockingCoroutine was cancelled (ActivityThread.java:2951)Īt (ActivityThread.java:3086)Īt .execute(LaunchActivityItem.java:78)Īt .executeCallbacks(TransactionExecutor.java:108)Īt .execute(TransactionExecutor.java:68)Īt $H.handleMessage(ActivityThread.java:1816)Īt android.os.Handler.dispatchMessage(Handler.java:106)Īt android.os.Looper.loop(Looper.java:193)Īt (ActivityThread.java:6718)Īt .invoke(Native Method)Īt .RuntimeInit$n(RuntimeInit.java:493)Īt .ZygoteInit.main(ZygoteInit.java:858)Ĭaused by: : BlockingCoroutine was cancelled 18:28:40.169 31502-31502/? I/Process: Sending signal. 2 hours ago &0183 &32 I see from similar questions here that parameters of Kotlin are final, that is, they are val and not var in the language of Kotlin. 18:16:43.665 29409-29409/ E/AndroidRuntime: FATAL EXCEPTION: main In Kotlin, nullability is intentionally treated to achieve null safety. 18:16:43.661 29409-29409/ D/AndroidRuntime: Shutting down VM getName() return x null null : Person(x) // how I would write it in Java return if (x null) null else Person(x) // typical equivalent in Kotlin. If you checked your local variable and it’s not null, nothing in the world could make it null, so Kotlin compiler allows to treat is as a non-null value. 18:16:43.655 29409-29409/ I/System.out: 收集元素 2 Kotlin tries to provide null-safety even when the variable could be changed from another thread. One of the most common pitfalls in many programming languages, including Java, is that accessing a member of a null reference will result in a null reference exception. Kotlin's type system is aimed at eliminating the danger of null references, also known as The Billion Dollar Mistake.
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