error in run android

[leonardgithub]

I am really happy to see you project, but I encountered an error:
I execute "npm i" in root folder, and then execute the same command in the reactnative folder, and run "react-native run-android && react-native start", then error occurs:
https://github.com/xueduany/react-mix/blob/675b2e74d8f684d1f55a05e514d8c44a390f2c6c/reactnative/android/app/src/main/java/com/reactnative/MainActivity.java and https://github.com/xueduany/react-mix/blob/675b2e74d8f684d1f55a05e514d8c44a390f2c6c/reactnative/android/app/src/main/java/com/reactnative/MainActivity.java.
I do not remember the detailed error, it is probably "no such method".
BTW, it is RN 0.31 now, your code still use RN 0.21, could you update and catch the new version of RN? Thanks!

[leonardgithub]

the error messages are below when run "react-native run-android"
:app:processDebugResources
Unknown source file : warning: string 'catalyst_debugjs' has no default translation.
Unknown source file : warning: string 'catalyst_element_inspector' has no default translation.
Unknown source file : warning: string 'catalyst_jsload_error' has no default translation.
Unknown source file : warning: string 'catalyst_jsload_message' has no default translation.
Unknown source file : warning: string 'catalyst_jsload_title' has no default translation.
Unknown source file : warning: string 'catalyst_reloadjs' has no default translation.
Unknown source file : warning: string 'catalyst_settings' has no default translation.
Unknown source file : warning: string 'catalyst_settings_title' has no default translation.

:app:generateDebugSources
:app:processDebugJavaRes UP-TO-DATE
:app:compileDebugJavaWithJavac
/Volumes/leonard/0-computaciones/espacio/prueba/react-mix/reactnative/android/app/src/main/java/com/reactnative/MainActivity.java:192: error: cannot find symbol
mReactInstanceManager.onHostPause();
^
symbol: method onHostPause()
location: variable mReactInstanceManager of type ReactInstanceManager
/Volumes/leonard/0-computaciones/espacio/prueba/react-mix/reactnative/android/app/src/main/java/com/reactnative/MainActivity.java:206: error: cannot find symbol
mReactInstanceManager.onHostResume(this, new DefaultHardwareBackBtnHandler() {
^
symbol: method onHostResume(MainActivity,)
location: variable mReactInstanceManager of type ReactInstanceManager
2 errors
:app:compileDebugJavaWithJavac FAILED

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:compileDebugJavaWithJavac'.

  Compilation failed; see the compiler error output for details.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 1 mins 58.958 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html

[leonardgithub]

react-native run-ios is OK

[asterisk622]

Has this project been maintained?

[leonardgithub]

@asterisk622 Seems not for a long time.