Update the Android project

[Abestanis]

I created a new flutter project and merged the new Android project template into the current one.

This has the following side effects:

• The way the status bar color is applied during the splash screen are improved:

  Before	After

• The application and services are now marked with the exported attribute, This will be required for Android API 31.

I was also planning to bring the target sdk version from 30 to Flutters default, 31. But we need to update our audioservice dependency first, because it creates a PendingIntent without specifying FLAG_IMMUTABLE. See the documentation and

the stack trace

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.nt4f04und.sweyer, PID: 23585
    java.lang.RuntimeException: Unable to create service com.ryanheise.audioservice.AudioService: java.lang.IllegalArgumentException: com.nt4f04und.sweyer: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:4518)
        at android.app.ActivityThread.-$$Nest$mhandleCreateService(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2153)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:201)
        at android.os.Looper.loop(Looper.java:288)
        at android.app.ActivityThread.main(ActivityThread.java:7844)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
     Caused by: java.lang.IllegalArgumentException: com.nt4f04und.sweyer: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
        at android.app.PendingIntent.checkFlags(PendingIntent.java:401)
        at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:671)
        at android.app.PendingIntent.getBroadcast(PendingIntent.java:658)
        at android.support.v4.media.session.MediaSessionCompat.<init>(MediaSessionCompat.java:557)
        at android.support.v4.media.session.MediaSessionCompat.<init>(MediaSessionCompat.java:528)
        at android.support.v4.media.session.MediaSessionCompat.<init>(MediaSessionCompat.java:492)
        at android.support.v4.media.session.MediaSessionCompat.<init>(MediaSessionCompat.java:466)
        at com.ryanheise.audioservice.AudioService.onCreate(AudioService.java:344)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:4505)
        	... 9 more

We could also use this opportunity to update our dependencies, like com.google.firebase, but I cant really test them easily, so I would leave that to you.

[nt4f04uNd]

Just a few small comments

I verified it and it definitely improves the splash screen - I was really lost in the past trying to find a configuration that would work like this one

Thank you for that!

[Abestanis]

I merged the .gitignore and re-added the commented elements in AndroidManifest.xml.

[nt4f04uNd]

OK, thanks!