An activity can use ViewFactory.retainNativeFlutterView to reuse a
FlutterNativeView across multiple instances of the activity. In this
scenario, the FlutterNativeView should continue to handle incoming messages
sent from Dart.
This PR mirrors virtual a11y tree of embedded platform views in the Flutter
a11y tree.
Non virtual hierarchies are not currently supported.
Only works on Android versions earlier than Android P as it relies on
reflection access to hidden system APIs which cannot be done starting
Android P.
A11y is not yet working as we also need to delegate a11y events from the
platform view to the FlutterView. This will be done in a following PR to
keep the change size a little saner.
PlatformViewsDelegate.
Since onDetachedFromWindow can be called after the activity was
destroyed, the previous call to detach the accessibility bridge could
have crash as the NativeFlutterView was already null.
The ICU data is packaged within libflutter.so, and the engine uses
dlsym(RTLD_DEFAULT) to look up the ICU data symbols in the libraries
loaded by the process.
This approach apparently fails on some Xiaomi devices. If RTLD_DEFAULT
can not find the symbols, then the platform will pass the path to the
libflutter.so library so the engine can use that to resolve the symbols.
Fixes https://github.com/flutter/flutter/issues/28208
Adds support for pointer signals, in a way that will support both discrete events (e.g., scroll wheels, flutter/flutter#22762) and continuous gestures (e.g., trackpad scroll, flutter/flutter#21953).
Also exposes these new event options to the embedder. Does not include code to send the
new events from the platform shells.
If an app is using retainFlutterNativeView or a plugin wants to keep the
FlutterNativeView active, then the FlutterNativeView should not drop its
handle to the corresponding native platform view.
Fixes https://github.com/flutter/flutter/issues/26931
From build log:
```
../../flutter/shell/platform/android/io/flutter/view/FlutterView.java:95: error: cannot find symbol
private final LocalizationChannel localizationChannel;
^
symbol: class LocalizationChannel
location: class FlutterView
../../flutter/shell/platform/android/io/flutter/view/FlutterView.java:172: error: cannot find symbol
localizationChannel = new LocalizationChannel(dartExecutor);
^
symbol: class LocalizationChannel
location: class FlutterView
2 errors
```
This reverts commit 256db4bc23b7931509233df0dc04e44e16608229.
Prior to this the Android embedder code would extract the icudtl.dat asset out
of the APK and write it to local disk during the first startup of the app.
This change will make that work unnecessary and eliminate the risk of ICU
failures due to errors in the extraction process.
This change adds explicit validation of dynamic patches in all places
where they're used, instead of only validating it in some places which
wasn't as reliable because some of the code paths were missed.
This change also moves utility functions that deal with validating
patches from ResourceExtractor to ResourceUpdater, to make them
available as API for other places in code that need this validation.
This fixes potential race condition when patch gets downloaded on top
of zip file that's currently in active use by resource extractor and/or
asset manager. This change is necessary since download can happen in
the background while normal application operations are in progress.
