Ionic 2 Native plugins does not work on device - ionic-framework

I'am using some Cordova plugins in my Ionic 2 application (camera, Geolocation, Facebook), but when i try to use them i have a message : "Native: tried calling Camera.getPicture, but the Camera plugin is not installed." but all my plugins are installed.
Any Suggestions ?
EDIT
#ionic/cli-utils : 1.7.0
ionic (Ionic CLI) : 3.7.0
global packages:
Cordova CLI : 7.0.1
local packages:
#ionic/app-scripts : 2.0.0
#ionic/cli-plugin-cordova : 1.4.0
#ionic/cli-plugin-ionic-angular : 1.3.2
Cordova Platforms : android 6.2.3
Ionic Framework : ionic-angular 3.5.0
System:
Android SDK Tools : 25.2.3
Node : v6.10.3
OS : Windows 10
npm : 3.10.10

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Ionic App Showing default icon when installing

I am facing an issue in the Ionic App icon, how I can fix it? please see images
Ionic Information
Ionic:
Ionic CLI : 5.4.9 (/usr/local/lib/node_modules/ionic)
Ionic Framework : #ionic/angular 4.4.2
#angular-devkit/build-angular : 0.13.9
#angular-devkit/schematics : 7.3.9
#angular/cli : 7.3.9
#ionic/angular-toolkit : 1.5.1
Capacitor:
Capacitor CLI : 1.1.0
#capacitor/core : 1.1.0
Cordova:
Cordova CLI : 9.0.0 (cordova-lib#9.0.1)
Cordova Platforms : ios 5.1.1
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.0.1, (and 7 other plugins)
Utility:
cordova-res : 0.8.1
native-run : not installed
System:
Android SDK Tools : 26.1.1 (/Users/iosdev/Library/Android/sdk)
ios-deploy : 2.0.0
ios-sim : 8.0.2
NodeJS : v10.15.3 (/usr/local/bin/node)
npm : 6.10.3
OS : macOS Mojave
Xcode : Xcode 10.2.1 Build version 10E1001
u can try these steps, (i solved mine like this only)
1. npm remove cordova-res
2. npm install cordova-res
and then replace those default icon with your custom one once again and
run ionic cordova resources that will generate your custom icon and it should be shown.
This is not a bug, its IOS default functionality, Try with lots of top applications from the App store showing the same.

IONIC 4 Android 9 Background Mode PlugIn. Disable Battery Optimisation

IONIC 4 BackgroundMode PlugIn is not disable battery optimisation.
I tested these solutions, but not working:
https://github.com/katzer/cordova-plugin-background-mode/issues/430
I try to set:
this.backgroundMode.on("activate").subscribe(()=>{
this.backgroundMode.disableWebViewOptimizations();
this.backgroundMode.disableBatteryOptimizations(); HERE
console.log("background activate !!!!");
});
But i get:
Property 'disableBatteryOptimizations' does not exist on type 'BackgroundMode'. Did you mean
'disableWebViewOptimizations'
Environment:
Ionic:
ionic (Ionic CLI) : 4.12.0 (C:\Users\Julio\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : #ionic/angular 4.9.1
#angular-devkit/build-angular : 0.801.3
#angular-devkit/schematics : 8.1.3
#angular/cli : 8.1.3
#ionic/angular-toolkit : 2.0.0
Cordova:
cordova (Cordova CLI) : 9.0.0 (cordova-lib#9.0.1)
Cordova Platforms : android 8.1.0
Cordova Plugins : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.1, (and 6 other plugins)
System:
Android SDK Tools : 26.1.1 (C:\Users\Julio\AppData\Local\Android\Sdk)
NodeJS : v11.12.0 (C:\Program Files\nodejs\node.exe)
npm : 6.7.0
OS : Windows 10
Any suggestion?
try this
First remove all the platforms, that is ios or android
ionic cordova platform rm android
ionic cordova platform rm ios
Now, add the following plugin,
ionic cordova plugin add https://github.com/tushe/cordova-plugin-background-mode.git
Then install the latest version of background-mode using
npm install --save #ionic-native/background-mode#latest
Add your platforms again then retry.

Why ionic APK for android is generating under the build/outputs/apki/debug/ folder and its not opening in device?

I am building a android APK normally it will generate inside output/apk/ folder but now its generating inside output/apk/debug folder, So my problem is when I install this generated APK in device it's not opening why ?
My ionic info :
#ionic/cli-utils : 1.9.2
ionic (Ionic CLI) : 3.9.2
global packages:
Cordova CLI : 8.0.0
local packages:
#ionic/app-scripts : 3.1.8
Cordova Platforms : android 7.0.0
Ionic Framework : ionic-angular 3.9.2
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Node : v8.11.0
npm : 5.6.0
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Tried to run ionic cordova platform add android#6.3.0 latest ionic version and do not why but the platforms\android\src\io\ionic\starter folder is missing where MainActivity.java is located
Tried reinstalling a new ionic version but still misses. I am installing specific 6.3.0 android version which was working perfectly fine in my previous build, so not sure why its missing the starter folder
Ionic info details below
#ionic/cli-utils : 1.19.2
ionic (Ionic CLI) : 3.20.0
global packages:
cordova (Cordova CLI) : 6.5.0
local packages:
#ionic/app-scripts : 3.1.10
Cordova Platforms : android 6.3.0
Ionic Framework : ionic-angular 3.9.2
System:
Android SDK Tools : 26.1.1
Node : v6.11.3
npm : 3.10.10
OS : Windows 10
Environment Variables:
ANDROID_HOME : C:\Users\Oreo\AppData\Local\Android\sdk\
Misc:
backend : pro
Main Activity java can be found in below location
.. \platforms\android\app\src\main\java\com\...
Why do you need this file? If you are building an app, APK can be found in below path
platforms\android\app\build\outputs\apk\release

how to access ionic.config.json

Is there a way to access ionic.config.json from a page or a provider in my ionic framework? I need to change proxy settings for android or web accordingly.
this is my ionic info:
#ionic/cli-utils : 1.19.2
ionic (Ionic CLI) : 3.20.0
global packages:
cordova (Cordova CLI) : 8.0.0
local packages:
#ionic/app-scripts : 3.1.8
Cordova Platforms : android 7.0.0
Ionic Framework : ionic-angular 3.9.2
System:
Android SDK Tools : 26.1.1
Node : v8.11.1
npm : 6.0.0
OS : Windows 10
Environment Variables:
ANDROID_HOME : C:\Users\themhz\AppData\Local\Android\Sdk
Misc:
backend : pro