Cannot run android app on some devices

Ionic Framework ionic-v3
1

Hello,

I developped an app that runs fine on most of Android devices. But unfortunately, I have feedback from several end-users that the app get stuck just after the splashscreen, actually just a white screen appears. All of them have Android version at least 5.1.

I could got the log from adb logcat with one device that cannot run my app:

MacBook-Pro:app p$ adb logcat chromium:D SystemWebViewClient:D *:S
--------- beginning of system
--------- beginning of main
I/chromium(11486): [INFO:library_loader_hooks.cc(104)] Chromium logging enabled: level = 0, default verbosity = 0
I/chromium(11486): [INFO:cpu.cc(186)] [LazyCpuInfoValue] cpufreq=[1300000]
W/chromium(11486): [WARNING:resource_bundle.cc(304)] locale_file_path.empty()
I/chromium(11486): [INFO:aw_browser_main_parts.cc(65)] Load from apk succesful, fd=34 off=1319084 len=3050
I/chromium(11486): [INFO:aw_browser_main_parts.cc(78)] Loading webviewchromium.pak from, fd:35 off:229484 len:1089551
I/chromium(11486): [INFO:sys_info_android.cc(261)] [GetBoardModel] === [mt6735]
I/chromium(11486): [INFO:build_info.cc(90)] [ParseDeviceModel] model=[mt6735]
W/chromium(11486): [WARNING:data_reduction_proxy_settings.cc(331)] SPDY proxy OFF at startup
W/chromium(11486): [WARNING:password_handler.cc(27)] create-->contents = 0xb7a0c510, delegate = 0xb7a3d950
W/chromium(11486): [WARNING:password_handler.cc(35)] attaching to web_contents 
I/chromium(11486): [INFO:sys_info_android.cc(230)] [SysInfo::GetCurrentProcessName] [com.alupex]
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: video/3gpp
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/3gpp
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: video/3gpp2
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: video/avi
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: video/mpeg
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/mpeg
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: video/x-m4v
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/aac
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/aac-adts
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/x-mpeg
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/flac
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/amr
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/amr-wb
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/quicktime
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/vorbis
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: video/quicktime
I/chromium(11486): [INFO:mime_util.cc(703)] insert media type: audio/quicktime
I/chromium(11486): [INFO:raster_worker_pool.cc(220)] [RasterWorkerCoordinator] enable=[0]
I/chromium(11486): [INFO:CONSOLE(175)] "OPEN database: _ionicstorage", source: file:///android_asset/www/plugins/cordova-sqlite-storage/www/SQLitePlugin.js (175)
I/chromium(11486): [INFO:CONSOLE(106)] "new transaction is queued, waiting for open operation to finish", source: file:///android_asset/www/plugins/cordova-sqlite-storage/www/SQLitePlugin.js (106)
I/chromium(11486): [INFO:CONSOLE(1)] "ERROR", source: file:///android_asset/www/build/vendor.js (1)
I/chromium(11486): [INFO:CONSOLE(179)] "OPEN database: _ionicstorage - OK", source: file:///android_asset/www/plugins/cordova-sqlite-storage/www/SQLitePlugin.js (179)
I/chromium(11486): [INFO:CONSOLE(80)] "DB opened: _ionicstorage", source: file:///android_asset/www/plugins/cordova-sqlite-storage/www/SQLitePlugin.js (80)
W/chromium(11486): [WARNING:aw_network_delegate.cc(92)] file:///android_asset/www/assets/fonts/roboto-regular.woff2#-6#1
I/chromium(11486): [INFO:CONSOLE(1)] "Ionic Native: deviceready event fired after 1915 ms", source: file:///android_asset/www/build/vendor.js (1)
W/chromium(11486): [WARNING:aw_network_delegate.cc(92)] file:///android_asset/www/assets/fonts/roboto-regular.woff#-6#1
W/chromium(11486): [WARNING:aw_network_delegate.cc(92)] file:///android_asset/www/assets/fonts/roboto-regular.ttf#-6#1
W/chromium(11486): [WARNING:password_handler.cc(206)] OnPasswordFormsRendered called
W/chromium(11486): [WARNING:aw_password_handler_delegate_impl.cc(202)] IsSavePasswordEnabled ret is 
W/chromium(11486): [WARNING:password_handler.cc(208)] OnPasswordFormsRendered IsEnabledSavePassword is false

I put below the characteristics of that mobile:
WechatIMG281

Do you know what is the problem and how I could solve it ?

Thanks!

2

Actually, after hours of digging and creating a new project for the same APP step by step, I found (at least) 2 issues:

The first one is one line of code this.headers = new Headers({'Content-Type': 'application/json'}) that I needed to change to this.headers = new HttpHeaders().set('Content-Type', 'application/json');.

Changing that line made my app working when I just kept some pages in the new project, but did not solve the problem in my original project. So finally, I end up to copy the whole src folder from the original project in the new project and finally my app works on this device.