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Hello, I have a problem trying to port a certain OEM android app

I'm trying to port LG system launcher but I can't get it to work due to a certain missing class called "LGSharedPreferences" or something like that. Here is the logcat obtained:
FATAL EXCEPTION: main
Process: com.lge.launcher3, PID: 9174
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/app/LGSharedPreferences;
at com.lge.launcher3.util.LGHomeFeature.getPermanentPreferences(LGHomeFeature.java:416)
at com.lge.launcher3.util.LGHomeFeature.getSwivelHomeStateFromPreferences(LGHomeFeature.java:369)
at com.lge.launcher3.util.LGHomeFeature.<init>(LGHomeFeature.java:278)
at com.lge.launcher3.util.LGHomeFeature.init(LGHomeFeature.java:294)
at com.lge.launcher3.allapps.SwivelAllAppsDBProvider.onCreate(SwivelAllAppsDBProvider.java:28)
at android.content.ContentProvider.attachInfo(ContentProvider.java:2388)
at android.content.ContentProvider.attachInfo(ContentProvider.java:2358)
at android.app.ActivityThread.installProvider(ActivityThread.java:7248)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:6789)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6706)
at android.app.ActivityThread.access$1300(ActivityThread.java:238)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1914)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7666)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.ClassNotFoundException: android.app.LGSharedPreferences
... 18 more
If it helps I tried both installing it as a user app and making a magisk module to install it as a system app (also I bundled with it some libraries I found in the app manifest such as "com.lge.sui" and "com.lge.lgdynamicactionbar" but no luck) and I always get the same error, some help will be highly appreciated 👍
By the way, sorry for my bad English, I'm still learning :)

The error message means that android.app.LGSharedPreferences was available at compile time, but is missing at runtime. Given the package name of the class, my guess would be that the class is supposed to be loaded from the OS on LG phones, and you are running the app on a phone that doesn't have that available.
If you have the source code for the app and the library that contains android.app.LGSharedPreferences, you should make sure the library containing LGSharedPreferences is statically compiled in (probably also change the package name to avoid conflicts on LG phones).

Error when click on edit text android

After actualization android studio to version 3.1 I have problem with my project.
When i click on edit text activity closing and throw exception.
I have no idea why is this happening, pls help.
E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!
E/AndroidRuntime: Error reporting crash
android.os.TransactionTooLargeException
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(Binder.java:496)
at android.app.ActivityManagerProxy.handleApplicationCrash(ActivityManagerNative.java:4180)
at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:144)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)

This is a bug in new android studio version(3.1), hope they fix it ASAP.
If you run same app without changing anything in previous version like 3.0 this app will work fine.

For now disabling it (Edit configuration settings -> Profiling -> Enable advanced profiling) prevents EditText from crashing

My app crashes on launch?

I apologize for the broad title but I struggle to be more specific because iIhonestly don't know what went wrong. I was working on my app just like normal, and I hadn't tested for a couple of hours and also I think I updated something in android studio (It prompted me that some features were ready to be updated and I clicked)
Anyways, I've reverted everything I could think of that I might have screwed up, but it still won't work. I figure it might be something in the gradle files. Is anyone able to figure it out based on this?
--------- beginning of crash
10-24 14:10:47.679 2597-2597/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.jonet.lillehauaapp, PID: 2597
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.example.jonet.lillehauaapp-a1apOVe4GHJGjXWwg52Lag==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.jonet.lillehauaapp-a1apOVe4GHJGjXWwg52Lag==/lib/x86, /system/lib, /system/vendor/lib]]] couldn't find "libnative-lib.so"
at java.lang.Runtime.loadLibrary0(Runtime.java:1011)
at java.lang.System.loadLibrary(System.java:1657)
at com.example.jonet.lillehauaapp.MainActivity.<clinit>(MainActivity.java:25)
at java.lang.Class.newInstance(Native Method)

Android Studio, unable to access data folder for database file on emulator

Ok, I have searched and searched without any success for someone with a similar question. I am developing an Android app using Android Studio and have started creating my SQLite database. In order to test my creation and upgrade functions I would like to extract my SQLite database and view it's contents.
Instructions online are fairly clear, open up Android Device Monitor, select the device, go to file explorer, and then browse a few levels deep in the data folder to find your .db file. Here is where the trouble starts. I am unable to expand the root level data folder at all. I have found numerous other questions regarding people having the same problem but they are all due to people trying to do it on un-rooted physical devices. I am simply trying to do it on an emulated device. I am certain it is a permissions problem but I'm not sure how to fix it.
Things I've tried:
Verified that my app is listed as a process on the device selected in the device monitor.
Restarted the AVD, Android Studio, and then my entire machine.
Uninstalled my app and reinstalled.
TLDR; can't access data folder in DDMS for emulated device in order to extract SQLite database file.

Same question to me.
When I want to access /data directory via Android Device Monitor, some error have occurred :
08-21 07:32:36.837: W/ls(3101): type=1400 audit(0.0:50): avc: denied { getattr } for path="/default.prop" dev="rootfs" ino=2941 scontext=u:r:shell:s0 tcontext=u:object_r:rootfs:s0 tclass=file permissive=0
08-21 07:32:37.418: W/PlatformStatsUtil(2507): Could not retrieve Usage & Diagnostics setting. Giving up.
This information tells us we don't have permission to access the directory.
Here are what I have done and works for me.
My OS is Window10
Start your ADV & Open Android Device Monitor
cd to /the/path/to/Android/sdk/platform-tools
Open your cmd or openshell here (shift + right click you will see the option)
execute following commands
.
./adb.exe shell
su
chmod -R 777 /data/data/your/package
Now, enjoy your coding.

Run your app in an emulator with API 23 (or lower).
check detailed information in link below,
Android Device Monitor "data" folder is empty

Eclipse Java - Android app using serial do not work

I'm trying to use an app in Eclipse (v3.8), but it don't work.
The API is 19, and the app is Serial_Port_1.1.apk
My method: (I'm new with eclipse)
Extract the apk with apktool
Import the folder with Eclipse
Run as: Android application
I got theses errors:
threadid=1: thread exiting with uncaught exception (group=0xb3ac2ba8)
FATAL EXCEPTION: main
Process: android_serialport_api.sample, PID: 1508
java.lang.RuntimeException: Unable to instantiate application android_serialport_api.sample.Application: java.lang.ClassNotFoundException: Didn't find class "android_serialport_api.sample.Application" on path: DexPathList[[zip file "/data/app/android_serialport_api.sample-1.apk"],nativeLibraryDirectories=[/data/app-lib/android_serialport_api.sample-1, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:516)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4317)
I'm trying to connect an Arduino to Eclipse, and the app works fine on a real system (ARM Orange Pi)

As it says in the LogCat, there is a ClassNotFoundException when you try to run it after decompile. As I understood, the original app works but after decompile + recompile it won't work again, throwing a CNF. This means that your decompile process didn't work properly. I suggest you trying the Android APK Decompiler, which is a free online tool.
Note: I haven't tested it yet, but it should work.