Predictive back route transitions by default #165832
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Where not supported, Zoom will be used.
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And get rid of all instances of _PredictiveBackPageTransition (old name).
chunhtai
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May 22, 2025
| static const Map<TargetPlatform, PageTransitionsBuilder> _defaultBuilders = | ||
| <TargetPlatform, PageTransitionsBuilder>{ | ||
| TargetPlatform.android: ZoomPageTransitionsBuilder(), | ||
| TargetPlatform.android: PredictiveBackPageTransitionsBuilder(), |
Contributor
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will this be a breaking change? I am not too familiar with the process of changing page transition. so maybe @QuncCccccc can chime in.
An alternative is some how expose the predicitiveback enabled setting to framework side and conditionally return PredictiveBackPageTransitionsBuilder or ZoomPageTransitionsBuilder.
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That's actually what it does internally:
So this PR moves us from Zoom to FadeForwards by default, and when doing a predictive back gesture, it will use the _PredictiveBackSharedElement transition by default.
Can you verify that we're good to make FadeForwards the default @QuncCccccc?
Contributor
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And it will always use that fallback aslong as you don't opt in in the AndroidManifest.xml, right?
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Changing the default to FadeForwards sounds good to me! Thank you!
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For flutter#165832, picks up the test change from zulip/zulip-flutter#1761 that was bumped in the tests repo in flutter/tests#466.
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This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back
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…" (flutter#173809) <!-- start_original_pr_link --> Reverts: flutter#165832 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: matanlurey <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Breaks `Linux_pixel_7pro embedded_android_views_integration_test`: - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8918/overview - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8917/overview ```txt [2025-08-14 16:01:17.600761] [STDOUT] stdout: [ +1 ms] Expecte <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: justinmc <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {QuncCccccc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>
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flutter/flutter@f4334d2...52af7a5 2025-08-15 engine-flutter-autoroll@skia.org Roll Packages from 09533b7 to 5c52c55 (6 revisions) (flutter/flutter#173854) 2025-08-15 engine-flutter-autoroll@skia.org Roll Skia from 46ec77ae3954 to 5654ac32ede0 (1 revision) (flutter/flutter#173848) 2025-08-15 engine-flutter-autoroll@skia.org Roll Skia from 162f47d6b6bd to 46ec77ae3954 (2 revisions) (flutter/flutter#173833) 2025-08-15 engine-flutter-autoroll@skia.org Roll Dart SDK from c7faab270f27 to cc008dc8e7aa (2 revisions) (flutter/flutter#173826) 2025-08-15 engine-flutter-autoroll@skia.org Roll Skia from ad5d04000101 to 162f47d6b6bd (5 revisions) (flutter/flutter#173822) 2025-08-15 jason-simmons@users.noreply.github.com Update the RBE configuration for the recent Clang update (flutter/flutter#173803) 2025-08-15 matanlurey@users.noreply.github.com Stop writing legacy `FLUTTER_ROOT/version` file (by default?) (flutter/flutter#172793) 2025-08-15 matanlurey@users.noreply.github.com Remove `luci_flags.parallel_download_builds` and friends (flutter/flutter#173799) 2025-08-14 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Predictive back route transitions by default (#165832)" (flutter/flutter#173809) 2025-08-14 engine-flutter-autoroll@skia.org Roll Skia from dca5f05fee87 to ad5d04000101 (8 revisions) (flutter/flutter#173798) 2025-08-14 mdebbar@google.com [web] Cleanup usages of deprecated `routeUpdated` message (flutter/flutter#173782) 2025-08-14 ahmedsameha1@gmail.com Make sure that DataTable, DataColumn, DataRow, and DataCell don't crash in 0x0 environment (flutter/flutter#173515) 2025-08-14 ahmedsameha1@gmail.com Make sure that a TableRowInkWell doesn't crash in 0x0 environment (flutter/flutter#173627) 2025-08-14 ahmedsameha1@gmail.com Make sure that a DatePickerDialog doesn't crash in 0x0 environment (flutter/flutter#173677) 2025-08-14 robert.ancell@canonical.com Return result of setting OpenGL contexts back to Flutter (flutter/flutter#173757) 2025-08-14 matanlurey@users.noreply.github.com Read `bin/cache/flutter.version.json` instead of `version` for `flutter_gallery` (flutter/flutter#173797) 2025-08-14 jmccandless@google.com Predictive back route transitions by default (flutter/flutter#165832) 2025-08-14 houssemeddinefadhli81@gmail.com feat: add onLongPressUp callback to InkWell widget (flutter/flutter#173221) 2025-08-14 engine-flutter-autoroll@skia.org Roll Dart SDK from 214a7f829913 to c7faab270f27 (1 revision) (flutter/flutter#173792) 2025-08-14 31859944+LongCatIsLooong@users.noreply.github.com Add error handling for `Element` lifecycle user callbacks (flutter/flutter#173148) 2025-08-14 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from I1TfNmsqTp7t3rO8e... to zWRpLglb48zC1vZLv... (flutter/flutter#173784) 2025-08-14 jhy03261997@gmail.com [Range slider] Tap on active range, the thumb closest to the mouse cursor should move to the cursor position. (flutter/flutter#173725) 2025-08-14 engine-flutter-autoroll@skia.org Roll Packages from 6cb9113 to 09533b7 (4 revisions) (flutter/flutter#173789) 2025-08-14 ttankkeo112@gmail.com Implements the Android native stretch effect as a fragment shader (Impeller-only). (flutter/flutter#169293) 2025-08-14 matanlurey@users.noreply.github.com Sync `CHANGELOG.md` (3.35 -> `master`) (flutter/flutter#173790) 2025-08-14 victorsanniay@gmail.com [VPAT][A11y] Announce Autocomplete search results status (flutter/flutter#173480) 2025-08-14 bruno.leroux@gmail.com Fix InputDecorator label padding (flutter/flutter#173344) 2025-08-14 edwinzn9@gmail.com Fix default minimumSize in dropdownMenu when maximumSize is null (flutter/flutter#169438) 2025-08-14 matanlurey@users.noreply.github.com Thread sub-builders for every engine-uploading builder (flutter/flutter#173742) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back
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…" (flutter#173809) <!-- start_original_pr_link --> Reverts: flutter#165832 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: matanlurey <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Breaks `Linux_pixel_7pro embedded_android_views_integration_test`: - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8918/overview - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8917/overview ```txt [2025-08-14 16:01:17.600761] [STDOUT] stdout: [ +1 ms] Expecte <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: justinmc <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {QuncCccccc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>
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This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back
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…" (flutter#173809) <!-- start_original_pr_link --> Reverts: flutter#165832 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: matanlurey <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Breaks `Linux_pixel_7pro embedded_android_views_integration_test`: - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8918/overview - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8917/overview ```txt [2025-08-14 16:01:17.600761] [STDOUT] stdout: [ +1 ms] Expecte <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: justinmc <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {QuncCccccc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>
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We need a robust way to get the duration of a route transition in tests,
so that tests can remain independent of the type of route transition and
its duration.
With this PR, this will be the canonical way to pump until a page
transition has finished:
```dart
testWidgets('example', (WidgetTester tester) async {
final TransitionDurationObserver observer = TransitionDurationObserver();
await tester.pumpWidget(
MaterialApp(
navigatorObservers: <NavigatorObserver>[observer],
onGenerateRoute: (RouteSettings settings) { ... },
),
);
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 2'), findsNothing);
// Pump through the whole transition.
await tester.tap(find.text('Next'));
await observer.pumpPastTransition(tester);
expect(find.text('Page 1'), findsNothing);
expect(find.text('Page 2'), findsOneWidget);
// Or, pump through part of a transition with the duration.
await tester.tap(find.text('Back'));
await tester.pump(observer.transitionDuration ~/ 2);
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 2'), findsOneWidget);
});
```
This was spun out of flutter#165832,
where updating the default route transition and its duration broke tests
in the framework, in customer tests, and in Google tests.
FYI @chrisbobbe
---------
Co-authored-by: Jing Shao <87506348+jingshao-code@users.noreply.github.com>
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flutter#172733) For flutter#165832, picks up the test change from zulip/zulip-flutter#1741 that was bumped in the `tests` repo in flutter/tests#464.
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For flutter#165832, picks up the test change from zulip/zulip-flutter#1761 that was bumped in the tests repo in flutter/tests#466.
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This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back
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…" (flutter#173809) <!-- start_original_pr_link --> Reverts: flutter#165832 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: matanlurey <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Breaks `Linux_pixel_7pro embedded_android_views_integration_test`: - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8918/overview - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8917/overview ```txt [2025-08-14 16:01:17.600761] [STDOUT] stdout: [ +1 ms] Expecte <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: justinmc <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {QuncCccccc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>
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flutter#172733) For flutter#165832, picks up the test change from zulip/zulip-flutter#1741 that was bumped in the `tests` repo in flutter/tests#464.
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For flutter#165832, picks up the test change from zulip/zulip-flutter#1761 that was bumped in the tests repo in flutter/tests#466.
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This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back
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…" (flutter#173809) <!-- start_original_pr_link --> Reverts: flutter#165832 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: matanlurey <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Breaks `Linux_pixel_7pro embedded_android_views_integration_test`: - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8918/overview - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8917/overview ```txt [2025-08-14 16:01:17.600761] [STDOUT] stdout: [ +1 ms] Expecte <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: justinmc <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {QuncCccccc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>
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This PR spawned out of flutter/flutter#165832 (comment). That PR will change the default page transition and turn on predictive back by default. While there is no API breakage, users may encounter test breakages in tests that indirectly depend on the default page transition and/or its duration. Several of these kinds of breakages were encountered in flutter/flutter#165832 in the framework tests, customer tests, and Google tests. This PR should explain: * What predictive back is. * How to make sure an app supports predictive back. * What the new Fade Fowards page transition looks like. * How to manually change the page transition back to the old one. * How to write tests that don't depend on the page transition and its duration. _Issues fixed by this PR (if any):_ n/a _PRs or commits this PR depends on (if any):_ flutter/flutter#165832 ## Presubmit checklist - [x] If you are unwilling, or unable, to sign the CLA, even for a _tiny_, one-word PR, please file an issue instead of a PR. - [x] If this PR is not meant to land until a future stable release, mark it as draft with an explanation. - [x] This PR follows the [Google Developer Documentation Style Guidelines](https://developers.google.com/style)—for example, it doesn't use _i.e._ or _e.g._, and it avoids _I_ and _we_ (first-person pronouns). - [x] This PR uses [semantic line breaks](https://github.com/dart-lang/site-shared/blob/main/doc/writing-for-dart-and-flutter-websites.md#semantic-line-breaks) of 80 characters or fewer. --------- Co-authored-by: Shams Zakhour <44418985+sfshaza2@users.noreply.github.com> Co-authored-by: Parker Lougheed <parlough@gmail.com>
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We need a robust way to get the duration of a route transition in tests,
so that tests can remain independent of the type of route transition and
its duration.
With this PR, this will be the canonical way to pump until a page
transition has finished:
```dart
testWidgets('example', (WidgetTester tester) async {
final TransitionDurationObserver observer = TransitionDurationObserver();
await tester.pumpWidget(
MaterialApp(
navigatorObservers: <NavigatorObserver>[observer],
onGenerateRoute: (RouteSettings settings) { ... },
),
);
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 2'), findsNothing);
// Pump through the whole transition.
await tester.tap(find.text('Next'));
await observer.pumpPastTransition(tester);
expect(find.text('Page 1'), findsNothing);
expect(find.text('Page 2'), findsOneWidget);
// Or, pump through part of a transition with the duration.
await tester.tap(find.text('Back'));
await tester.pump(observer.transitionDuration ~/ 2);
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 2'), findsOneWidget);
});
```
This was spun out of flutter#165832,
where updating the default route transition and its duration broke tests
in the framework, in customer tests, and in Google tests.
FYI @chrisbobbe
---------
Co-authored-by: Jing Shao <87506348+jingshao-code@users.noreply.github.com>
lucaantonelli
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flutter#172733) For flutter#165832, picks up the test change from zulip/zulip-flutter#1741 that was bumped in the `tests` repo in flutter/tests#464.
lucaantonelli
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For flutter#165832, picks up the test change from zulip/zulip-flutter#1761 that was bumped in the tests repo in flutter/tests#466.
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This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back
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…" (flutter#173809) <!-- start_original_pr_link --> Reverts: flutter#165832 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: matanlurey <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Breaks `Linux_pixel_7pro embedded_android_views_integration_test`: - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8918/overview - https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_pixel_7pro%20embedded_android_views_integration_test/8917/overview ```txt [2025-08-14 16:01:17.600761] [STDOUT] stdout: [ +1 ms] Expecte <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: justinmc <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {QuncCccccc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: This PR turns on predictive back route transitions by default on supported Android devices. With flutter#154718, the default (PredictiveBackPageTransitionsBuilder) is the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). The [full screen transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) is also available by using PredictiveBackFullScreenPageTransitionsBuilder. Original PR: flutter#146788 Depends on: flutter#154718 When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>
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This PR turns on predictive back route transitions by default on supported Android devices.
With #154718, the default (PredictiveBackPageTransitionsBuilder) is the shared element transition. The full screen transition is also available by using PredictiveBackFullScreenPageTransitionsBuilder.
Original PR: #146788
Depends on: #154718
When this lands in stable, the docs should be updated: https://docs.flutter.dev/platform-integration/android/predictive-back