Android Kotlin - 捕获异常仍然使程序崩溃

Question

代码:

  viewModel.saveLayer.observeNonNull(this) {
        Log.i(TAG, "save layer")
        try {
            // starting to record takes longer than stopping. so, if timed right, a recorder could be stopped
            // before started.
            with(mediaRecorder) {
                stop()
                reset()
            }
            sharedPrefs.updateNumSavedLayers(it)
            viewModel.updateNumSavedLayers(it)
        } catch(e: Exception) {
            Log.e(TAG,"could not save layer", e)
        }
    }

崩溃仍然抛出。见下文:

2019-02-20 19:45:22.514 22435-22435/com.xxx.xxx E/PedalApp: could not save layer java.lang.RuntimeException: stop failed. at android.media.MediaRecorder.stop(Native Method) at com.androidchekhov.looperpedal.PedalActivity$onCreate$6.invoke(PedalActivity.kt:92) at com.androidchekhov.looperpedal.PedalActivity$onCreate$6.invoke(PedalActivity.kt:17) at com.androidchekhov.looperpedal.ExtensionsKt$observeNonNull$1.onChanged(Extensions.kt:9) at android.arch.lifecycle.LiveData.considerNotify(LiveData.java:109) at android.arch.lifecycle.LiveData.dispatchingValue(LiveData.java:126) at android.arch.lifecycle.LiveData.setValue(LiveData.java:282) at android.arch.lifecycle.MutableLiveData.setValue(MutableLiveData.java:33) at com.xxx.xxx.PedalViewModel.pedalClick(PedalViewModel.kt:47) at com.androidchekhov.looperpedal.PedalActivity$onCreate$11.invoke(PedalActivity.kt:137) at com.androidchekhov.looperpedal.PedalActivity$onCreate$11.invoke(PedalActivity.kt:17) at com.androidchekhov.looperpedal.OnPedalTouchListener.handleClick(OnPedalListener.kt:80) at com.androidchekhov.looperpedal.OnPedalTouchListener.onTouch(OnPedalListener.kt:41) at android.view.View.dispatchTouchEvent(View.java:11775) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2600) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2600) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2600) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2600) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2600) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2600) at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:448) at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1834) at android.app.Activity.dispatchTouchEvent(Activity.java:3312) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69) at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:410) at android.view.View.dispatchPointerEvent(View.java:12018) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4829) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4643) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4181) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4234) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4200) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4327) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4208) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4384) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4181) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4234) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4200) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4208) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4181) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6755) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6694) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6655) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6858) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:193 at android.os.MessageQueue.nativePollOnce(Native Method)

Answer 1

不确定我是否误解了您的问题，但以下行表明您看到的异常是由您自己的代码打印的:

Log.e(TAG,"无法保存图层", e)

如果您向 Log.e 命令提供异常，它会与您的消息一起打印(参见 documentation ):

Send a ERROR log message and log the exception.

请注意，您的消息“无法保存图层”也会显示。因此，您只看到打印的堆栈跟踪，但异常已被正确捕获，因此不会使您的应用程序崩溃。也许后续问题是崩溃的原因。

请 (1) 提供有关该应用程序的更多上下文，以及 (2) 检查您是否可以共享其他崩溃指示器，例如 logcat。根据您提供的信息，我假设还有另一次崩溃导致应用程序崩溃。