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By default, Android's System.out and System.err are implemented by the AndroidPrintStream subclass of LoggingPrintStream. Until now, that class has silently discarded the raw bytes it has received. This causes two problems: Applications may be accidentally wasting CPU+memory writing to System.out. By making this output visible, the developers of such applications can silence the problem at the source. Application developers may be purposefully writing to these streams and perplexed by the data's disappearance. For example, the core library's own java.util.logging.ConsoleHandler sends its log data into this black hole. By making the data visible, we save the data and remove an unnecessary sharp edge from our API.
This package contains tests which need to access package-private members in the framework code. To do this, the tests must be loaded in the same class loader as the classes which they are testing. This package is loaded in the boot classpath. Run these tests via AndroidTests -> FrameworkTests.