Added instructions-to-self to PUBLISH.md

PUBLISH.md

@@ -1 +1,131 @@
+https://github.com/blundell/release-android-library
+I've been having a lot of practical problems publishing this project to JCenter/Maven - and I've managed to nearly forget the solution every time.
+
+So this is mostly a note to myself.
+
+##The problem
+This project produces three `.aar` Java libraries and an Android `.apk` application, which depend on eachother like this:
+
+    fast-barcode-scanner-demo.apk => fast-barcode-scanner.aar => still-sequence-camera.aar
+                                                              => tracking-barcode-scanner.aar
+
+The problem is that the build.gradle file for `fast-barcode-scanner` contains the following internal references:
+
+    dependencies {
+        ...
+        compile project(':still-sequence-camera')
+        compile project(':tracking-barcode-scanner')
+    }
+
+Let's say I want to release version 1.0.4. If I go ahead and do that, the first app referencing the new `fast-barcode-scanner-1.0.4.aar` will get compilation errors that the internal references to `still-sequence-camera.aar` and `tracking-barcode-scanner.aar` cannot be resolved.
+
+So I update the `build.gradle` references to properly versioned refs:
+
+    dependencies {
+        ...
+        compile 'dk.schaumburgit.fast-barcode-scanner:still-sequence-camera:1.0.4'
+        compile 'dk.schaumburgit.fast-barcode-scanner:tracking-barcode-scanner:1.0.4'
+    }
+
+But now the `fast-barcode-scanner` project won't build because version 1.0.4 hasn't been released yet.
+
+Catch-22: I naturally cannot release until I've built - but I cannot build until I've released!
+
+The solution of course if to work by way up the dependency tree: first build and release the two independent projects in version 1.0.4, then update the references in the intermediate `fast-barcode-scanner`library and build-and-release that, and finally update-build-and-release the top-level `fast-barcode-scanner-demo` project
+
+##Define the release
+First, log into JCenter at https://bintray.com/ and create the new release in JCenter:
+
+(screenshot)
+
+Next, in each of the 4 gradle files, edit
+
+    ext {
+        ...
+        PUBLISH_VERSION = '1.0.4'
+    }
+
+##Release the independents
+Now release the two projects without dependencies, still-sequence-camera and tracking-barcode-scanner:
+
+    cd still-sequence-camera
+    ..\gradlew clean build generateRelease
+    cd ..
+
+    cd tracking-barcode-scanner
+    ..\gradlew clean build generateRelease
+    cd ..
+
+This produces two zip files ready for upload:
+
+    still-sequence-camera\build/release-1.0.4.zip
+    tracking-barcode-scanner\build/release-1.0.4.zip
+
+These can be uploaded by clicking "Upload files":
+
+photo2a
+
+Now, for each of the zip files, do the following (first all the steps for one, then all the steps for the other - trying to combine have given problems).
+
+Drag the zip onto the download area:
+
+photo 2b
+
+Remember to click "Explode this file" before clicking "Save changes".
+
+Then click "Publish":
+
+photo3
+
+##Release the library project
+Now that the two libraries are available as properly versioned entities, the library project can be updated to reference them.
+
+In the fast-barcode-scanner\build.gradle file, update the references from local project references to proper versioned references:
+
+    dependencies {
+        compile fileTree(include: ['*.jar'], dir: 'libs')
+        testCompile 'junit:junit:4.12'
+        compile 'dk.schaumburgit.fast-barcode-scanner:still-sequence-camera:1.0.4'
+        compile 'dk.schaumburgit.fast-barcode-scanner:tracking-barcode-scanner:1.0.4'
+        //compile project(':still-sequence-camera')
+        //compile project(':tracking-barcode-scanner')
+    }
+
+Then build and package:
+
+    cd fast-barcode-scanner
+    ..\gradlew clean build generateRelease
+    cd ..
+
+Like before, this produces a zip-file ready for upload:
+
+    fast-barcode-scanner\build\release-1.0.4.zip
+
+Upload and publish like before.
+
+##Release the demo
+
+Though the demo is never referenced using a gradle reference, we'll publish it in JCenter too, just for completeness.
+
+In `fast-barcode-scanner-demo\build.gradle`, update the reference to the fast-barcode-scanner library:
+
+    dependencies {
+        compile fileTree(include: ['*.jar'], dir: 'libs')
+        testCompile 'junit:junit:4.12'
+        compile 'com.android.support:appcompat-v7:23.1.0'
+        compile 'com.android.support:design:23.1.0'
+        compile 'com.android.support:support-v4:23.1.0'
+        compile 'com.android.support:support-v13:23.1.0'
+        compile 'dk.schaumburgit.fast-barcode-scanner:fast-barcode-scanner:1.0.4'
+        -//compile project(':fast-barcode-scanner')-
+    }
+
+Build:
+
+    cd fast-barcode-scanner-demo
+    ..\gradlew clean build generateRelease
+    cd ..
+
+And then upload and publish.
+