[embedder] Remove warning about infinite loading.

This no longer seems to happen, maybe due to an SDK upgrade
or workflow improvements to always use the right version
of ffx.

Change-Id: I39f5c4bd07dd955d3079ff090a9f363c182e8599
Reviewed-on: https://fuchsia-review.googlesource.com/c/flutter-embedder/+/735883
Reviewed-by: Ben Bergkamp <benbergkamp@google.com>
1 file changed
tree: 5812a5103773edde6ad5f31a79bf1d1bce315dd2
  1. docs/
  2. hooks/
  3. scripts/
  4. src/
  5. third_party/
  6. tools/
  7. .bazelrc
  8. .clang-format
  9. .editorconfig
  10. .gitignore
  11. .gitmodules
  15. OWNERS
  17. README.md
  19. WORKSPACE.bazel


The Flutter Embedder for Fuchsia is a new in-progress runtime for Flutter apps on Fuchsia. This runtime is built on top of Flutter's embedder platform.

This repository is a work in progress and should be considered experimental.


If you're using WSL2 (Windows Subsystem for Linux), see SETUP_WINDOWS.md first.

  1. Set $FUCHSIA_EMBEDDER_DIR to your flutter-embedder.git checkout location, for example ~/flutter-embedder.

    export FUCHSIA_EMBEDDER_DIR=$HOME/flutter-embedder
  2. Bootstrap the repository's dependencies:


    This script initializes tools (including bazel and ffx), installs some Git hooks and downloads the workstation_eng.qemu-x64 product bundle, which you can use to run the examples below.

Run an example app

  1. Start the emulator.

    If running in a graphical environment:

    $FUCHSIA_EMBEDDER_DIR/tools/ffx emu start workstation_eng.qemu-x64

    If running in a terminal environment:

    $FUCHSIA_EMBEDDER_DIR/tools/ffx emu start --headless workstation_eng.qemu-x64

    The workflow below also supports Fuchsia builds from source that are within Fuchsia's SDK compatibility window (six weeks).

  2. Set the default target in ffx to be fuchsia-emulator:

    $FUCHSIA_EMBEDDER_DIR/tools/ffx target default set fuchsia-emulator
  3. Run an example component:

    $FUCHSIA_EMBEDDER_DIR/scripts/build_and_run_example.sh hello_flutter
    • To watch logs for the example component, run:

      $FUCHSIA_EMBEDDER_DIR/scripts/build_and_run_example.sh hello_flutter --log

      If you want to watch all logs, run $FUCHSIA_EMBEDDER_DIR/tools/ffx log in a separate terminal.

    • To watch FIDL calls for the example component, run:

      $FUCHSIA_EMBEDDER_DIR/scripts/build_and_run_example.sh hello_flutter --fidl


      • --fidl currently requires setting $FUCHSIA_DIR to a Fuchsia source checkout with a build in $FUCHSIA_DIR/out/default. This directory is only used to read IR files for FIDL, you can still use the workstation_eng.qemu-x64 product bundle with --fidl.

      • --fidl attaches after the component has been run, so it does not pick up FIDL calls made when the component starts.

      TODO(akbiggs): Work with Bazel SDK team to get proper support for --fidl.

Making Flutter Engine changes

Running the Flutter app is handled by the Flutter Engine's embedder platform code. This code is compiled into a shared library called libflutter_engine.so, which we can interact with using the embedder.h header.

If you need to make changes to this Flutter Engine code (for example for testing a new API in embedder.h with this embedder) see making_engine_changes.md for instructions. This isn‘t required for changes to only flutter-embedder.git’s source code.

Uploading changes for review.

See git_workflow.md.