运行不了

[Quyunshuo]

kotlin.KotlinNullPointerException at com.itfitness.videodemo.widget.VideoCameraView.getCamera(VideoCameraView.kt:12) at com.itfitness.videodemo.manager.VideoRecordManager.start(VideoRecordManager.kt:19) at com.itfitness.videodemo.MainActivity$onCreate$1.onClick(MainActivity.kt:22) at android.view.View.performClick(View.java:6642) at android.view.View.performClickInternal(View.java:6619) at android.view.View.access$3100(View.java:790) at android.view.View$PerformClick.run(View.java:26188) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:243) at android.app.ActivityThread.main(ActivityThread.java:7172) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:511) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)

kotlin 应该避免使用断言