Migration documentation

I checked the migration and the what changed in Android 9 documentation. A few things that must done in wpandroid:

To continue using the Apache HTTP client, apps that target Android 9 and above can add the following to their AndroidManifest.xml:

Done in ad8be63

Apps wanting to use foreground services must now request the FOREGROUND_SERVICE permission first. This is a normal permission, so the system automatically grants it to the requesting app. Starting a foreground service without the permission throws a SecurityException.

Done in 72fb4f5

Got a crash in the Login screen due to an outdated Lottie version

Stumbled on an error from Lottie.

2019-07-03 12:21:13.032 29195-29195/org.wordpress.android.beta E/AndroidRuntime: FATAL EXCEPTION: main
    Process: org.wordpress.android.beta, PID: 29195
    java.lang.IllegalArgumentException: Invalid Region.Op - only INTERSECT and DIFFERENCE are allowed
        at android.graphics.Canvas.checkValidClipOp(Canvas.java:843)
        at android.graphics.Canvas.clipRect(Canvas.java:890)
        at com.airbnb.lottie.CompositionLayer.drawLayer(CompositionLayer.java:79)
        at com.airbnb.lottie.BaseLayer.draw(BaseLayer.java:162)
        at com.airbnb.lottie.LottieDrawable.draw(LottieDrawable.java:283)

I updated the dependency to the latest version in 57f8f4d.

Lint error: Using left/right instead of start/end attributes

I had to bump minimum sdk version for the login flow from 16 to 17 (API <= 16 requires left/right attributes and start/end, which is incompatible with the changes in API 28).

Done in 5a61c0a764

Bumped to latest FluxC version in 56e200c

Note: only one line changed in FluxC between current and updated versions

# in WordPress-FluxC-Android/
$ git diff f07192bb7b8bf9aa7c5f8717988d9f17590a0db3 2c38f70f8a45ec12f12ebac1de1c646ea9e49b7f | cat
diff --git a/fluxc/build.gradle b/fluxc/build.gradle
index 447fc256f..0f797000d 100644
--- a/fluxc/build.gradle
+++ b/fluxc/build.gradle
@@ -28,7 +28,7 @@ android {
         versionCode 4
         versionName "0.1"
         minSdkVersion 15
-        targetSdkVersion 26
+        targetSdkVersion 28
     }
     buildTypes {
         release {

Tests

• Tested on a device with API 28 and an emulator on API 21.
• Tested Stetho was working as expected.