sending message to a Handler on a dead thread

[qq724418408]

java.lang.IllegalStateException: Handler (com.google.android.cameraview.CameraImpl$2) {c7663c0} sending message to a Handler on a dead thread at android.os.MessageQueue.enqueueMessage(MessageQueue.java:545) at android.os.Handler.enqueueMessage(Handler.java:661) at android.os.Handler.sendMessageAtTime(Handler.java:630) at android.os.Handler.sendMessageDelayed(Handler.java:600) at android.os.Handler.sendEmptyMessageDelayed(Handler.java:564) at android.os.Handler.sendEmptyMessage(Handler.java:549) at com.google.android.cameraview.CameraImpl$3.onPreviewFrame(CameraImpl.java:140) at android.hardware.Camera$EventHandler.handleMessage(Camera.java:1262) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6710) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)