Static analyzer

This changeset adds a static analyzer, "lint", which looks for various
potential bugs in Android projects.  It has 3 parts:

(1) A library which performs the actual static checks.
    This library is standalone: it does not depend on Eclipse.
    (Technically the library has two halves: an API half, for use
    by third party developers to write additional detectors, and
    an actual implementation of a bunch of built-in checks.)

(2) A command line driver, "lint", which runs the static checks and
    emits any warnings to standard out. This can be thought of as
    a replacement for the layoutopt tool.

(3) Eclipse integration. Lint errors are added to the Problems view as
    well as shown as editor annotations. There's an options panel for
    controlling which detectors are enabled. There's also a quickfix
    for disabling errors directly within the editor and a marker
    resolution for disabling them via the Problems view.

    The static checks are run on an XML file right after it has been
    saved. (This is optional via a toggle on the same preference page
    as the detector list.)

    The static checks are also run when you export an APK, and if any
    fatal errors are found the export is abandoned. (This is also
    optional via an option).

    Finally you can run a full lint through the Android Tools menu,
    and there's also an action to clear all the lint markers there.

    There's also a new indicator on the layout editor which shows
    whether there are lint errors on the associated file, and when
    clicked brings up a dialog listing the specific errors.

This changeset also includes a number of checks:

* An accessibility detector which warns about images missing
  contentDescriptions
* A drawable selector detector which warns about state lists where not
  all states are reachable (e.g. it is not the case that only the last
  item in the list omits a state qualifier)
* A detector finding duplicate ids, not just in the current layout but
  across included layouts (transitively) as well
* All the layoutopt ones ported to Java + DOM
* Unit tests for the above.

The focus here is on getting the infrastructure in place, and it
currently focuses on XML resource files and analyzing them
efficiently. See the comment in XmlVisitor for details on that.

Change-Id: Ic5f5f37d92bfb96ff901b959aaac24db33552ff7

1 files changed, 4 insertions, 0 deletions

diff --git a/lint/.gitignore b/lint/.gitignore
new file mode 100644
index 0000000..99d9ac8
--- /dev/null
+++ b/lint/.gitignore
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+cli/bin
+libs/lint_api/bin
+libs/lint_checks/bin
+libs/lint_checks/tests/bin