[PSA] Java 8 coming to Chrome on Android

[Felix]

Java development for Chrome on Android now supports Java 8 features such as lambdas, default interface methods, static interface methods, and try-with-resources statements (no need to guard with API level checks any more).

Currently, known limitations include:

1) Annotation @SuppressLint may not work properly with lambdas.

2) When checking in prebuilt Java jar/aar files, if the files have already been processed by Desugar, please add jar_excluded_patterns = [ "*ThrowableExtension*.class" ] to the build target. Example here.

Known issues include:

1) Android Studio 2.x may no longer work properly. Please use Android Studio 3 if necessary.

[Andrew Grieve]

\o/

I'll also add that Felix has been going through and using Android Studio inspections to convert our code to use lambdas where applicable. It gets rid of quite a lot of boiler-plate! Thanks for seeing this through!

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[Bo Liu]

Question: is desugar doing another step of code transformation in addition to proguard? Would that have the potential to change up java stack source line numbers, and can the deobfuscation tool reverse that as well?

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[Andrew Grieve]

Hmm, good question indeed. Here's an example stack trace where I've added to setPrivateDataDirectorySuffix():

            Runnable r = () -> {

              throw new RuntimeException("What will this do?");

            };

            r.run();

08-17 14:47:58.736  7135  7135 E AndroidRuntime: Caused by: java.lang.RuntimeException: What will this do?

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.base.PathUtils.lambda$setPrivateDataDirectorySuffix$0$PathUtils(PathUtils.java:134)

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.base.PathUtils$$Lambda$0.run(Unknown Source:0)

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.base.PathUtils.setPrivateDataDirectorySuffix(PathUtils.java:136)

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.chrome.browser.init.ChromeBrowserInitializer.preInflationStartup(ChromeBrowserInitializer.java:211)

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.chrome.browser.init.ChromeBrowserInitializer.handlePreNativeStartup(ChromeBrowserInitializer.java:161)

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.chrome.browser.init.AsyncInitializationActivity.onCreateInternal(AsyncInitializationActivity.java:283)

08-17 14:47:58.736  7135  7135 E AndroidRuntime: at org.chromium.chrome.browser.init.AsyncInitializationActivity.onCreate(AsyncInitializationActivity.java:243)

[Bo Liu]

I assume r.run() is line 136? So looks fine for that case

[Andrew Grieve]

On Thu, Aug 17, 2017 at 2:56 PM, Bo Liu <bo...@chromium.org> wrote:

I assume r.run() is line 136? So looks fine for that case

Yes.