I am trying to start responding to my own application on the Android emulator ( react-native run-android), however it continues to crash with the error message "MYAPP has stopped." I am trying to figure out where I can debug this further (error messages, logs, etc.). I definitely do not see error messages on the terminal or the emulator itself. Therefore, in addition to trying to decide why the application will not be deployed ... where do you want to continue debugging problems with deploying applications on the Android emulator?
Side note: I upgraded from version 0.31.0 to 0.32.0 and ran a react-native upgradecommand that also requires that some files be overwritten (I selected the option to overwrite all files). Should I worry that the latest changes from upgrading to 0.32.0 do not work or are incomplete? Any steps I can take to verify that the latest changes exist?
Update: . I created a new sample in charge of my own project to see if something was wrong with the latest version of RN. It worked fine. Then I took a sample code in index.android.js and rewrote it in my index.android.js project and restarted. There is still a problem trying to deploy it to an Android emulator. Deleted node_modules directory, replay, another issue. Now I think this is due to the update process ... it is very unpleasant.
Update v2: Thanks to @GabeSechan for help and direction, here is the stack trace I found:
09-04 03:24:41.297 5008 5008 E AndroidRuntime: FATAL EXCEPTION: main
09-04 03:24:41.297 5008 5008 E AndroidRuntime: Process: com.helpr, PID: 5008
09-04 03:24:41.297 5008 5008 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.helpr/com.helpr.MainActivity}: java.lang.ClassCastException: android.app.Application cannot be cast to com.facebook.react.ReactApplication
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.ActivityThread.-wrap12(ActivityThread.java)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.os.Looper.loop(Looper.java:154)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6077)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to com.facebook.react.ReactApplication
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at com.facebook.react.ReactActivity.getUseDeveloperSupport(ReactActivity.java:89)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:96)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:6664)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
09-04 03:24:41.297 5008 5008 E AndroidRuntime: ... 9 more
After a quick Google search, it seems like this is an existing issue when it comes to updating React Native. I will send an answer in response to my question.