[3.x] Android: Set minsdk to 21, workaround fseeko error in Opus.

[InfoDevkota]

Min SDK to 21.

this change seems to fix the fseeko on #108433 (comment).

Also,
Can we please release 3.6.2 with just the changes so we can upload the apps to Play Console.

[lawnjelly]

Looks great, will wait for @syntaxerror247 to review.

I'll be pushing for some reviews so we can get out either 3.7 dev 1 (or failing that 3.6.2).

[InfoDevkota]

If we can pick these two commits:

1. 21d7340
2. 3c64599

and the one commit from this PR,
and apply them on top of 3.6.1 (3.6),

we can have a version we can build and release games with.

Then, for 3.7, we can take our time to test and release.

[akien-mga]

I would also suggest prioritizing 3.6.2 solving these issues, there needs to be a stable 3.x version people can use to publish games.

We should also evaluate whether iOS and macOS compatibility is still good in 3.6.x. For Windows and Linux usually there's not much evolution of the platform requirements.

[syntaxerror247]

@InfoDevkota Have you tested the changes by exporting to an Android 5 device?

[InfoDevkota]

@syntaxerror247 I had not tested.

I just tried, was trying for Android 7.

1. creating a 3.7.dev.mono directory on .local/share/godot/templates.
2. place the android_release source and .arr there.

and tried the export.

I am getting

android/build/src/com/godot/game/GodotApp.java:33: error: package org.godotengine.godot does not exist
import org.godotengine.godot.FullScreenGodotApp;

android/build/src/com/godot/game/GodotApp.java:41: error: cannot find symbol
public class GodotApp extends FullScreenGodotApp {
...

errors.

Sorry first time here.

[syntaxerror247]

@InfoDevkota You can test this using a custom template:

1. Download the android-template.zip from the CI artifacts (found under the Checks tab of this PR).
2. Extract the contents of the ZIP file.

From the extracted files, select the android_release.apk in the export window. Now export!

[InfoDevkota]

On my 3.6.1 Executable (editor), Where there was already 'android' directory. (ie, Install Android build template was done from 3.6.1 templates)

I choose the custom template. The game is being build, and running fine on Android 7 and Android 10.

I don't have Android 5, I will try an emulator and update here.

@syntaxerror247

[Alex2782]

#108433 (review)

If you could make the custom template available for download, I could test it on my Android 6 device.

Crash on Android 6 (API 23)
java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "in6addr_any" referenced by "/data/app/org.godotengine.firstgodotproject-1/lib/arm/libgodot_android.so"...

ndk platform = android-21 (as in this PR), it should no longer occur and work again

[InfoDevkota]

@Alex2782 as mentioned by @syntaxerror247 you can click on the Checks (14) on top of this PR. link.

You can find the Artifacts 9 dropdown. and download "android templates" from there. direct link.

Its a bit slow.

[InfoDevkota]

@syntaxerror247

Update: Its working fine on Android 5. (tested on emulator).

The error message (before this update) was because I had not selected that x86 on Architectures.

[Alex2782]

Looks good on Android 6 (API 23)

09-30 16:10:30.854  7217  7230 I godot   : Godot Engine v3.7.dev.custom_build.e4cf5ff48 - https://godotengine.org
09-30 16:10:30.878  7217  7230 I godot   : OpenGL ES 2.0 Renderer: Adreno (TM) 320

[m4gr3d]

Seems like there were issues with 21 as the min sdk as mentioned in #108433 (comment).. Does this PR validate that the referenced issues have been addressed?

cc @WolfgangSenff

[syntaxerror247]

@m4gr3d I had fixed that issue in that PR itself. Issue was that Kyle hadn't updated the ndk_platform version from android-19 to android-21.

[syntaxerror247]

Looks good! Thanks for the fix

[lawnjelly]

Thanks!