• Zachary Anderson's avatar
    Update Android minSdkVersion to 21 (#142267) · 6a6874ec
    Zachary Anderson authored
    This PR increases Android's `minSdkVersion` to 21.
    
    There are two changes in this PR aside from simply increasing the number
    from 19 to 21 everywhere.
    
    First, tests using `flutter_gallery` fail without updating the
    lockfiles. The changes in the PR are the results of running
    `dev/tools/bin/generate_gradle_lockfiles.dart` on that app.
    
    Second, from
    [here](https://developer.android.com/build/multidex#mdex-pre-l):
    > if your minSdkVersion is 21 or higher, multidex is enabled by default
    and you don't need the multidex library.
    
    As a result, the `multidex` option everywhere is obsolete. This PR
    removes all logic and tests related to that option that I could find.
    `Google testing` and `customer_tests` pass on this PR, so it seems like
    this won't be too breaking if it is at all. If needed I'll give this
    some time to bake in the framework before landing the flutter/engine
    PRs.
    
    Context: https://github.com/flutter/flutter/issues/138117,
    https://github.com/flutter/flutter/issues/141277, b/319373605
    6a6874ec
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