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Janic Duplessis 18394fb179 Initial implementation of requestIdleCallback on Android

Summary:
This is a follow up of the work by brentvatne in #5052. This addresses the feedback by astreet.

- Uses ReactChoreographer with a new callback type
- Callback dispatch logic moved to JS
- Only calls into JS when needed, when there are pending callbacks, it even removes the Choreographer listener when no JS context listen for idle events.

** Test plan **
Tested by running a background task that burns all remaining idle time (see new UIExplorer example) and made sure that UI and JS fps stayed near 60 on a real device (Nexus 6) with dev mode disabled. Also tried adding a JS driven animation and it stayed smooth.

Tested that native only calls into JS when there are pending idle callbacks.

Also tested that timers are executed before idle callback.
```
requestIdleCallback(() => console.log(1));
setTimeout(() => console.log(2), 100);
burnCPU(1000);
// 2
// 1
```

I did *not* test with webworkers but it should work as I'm using executor tokens.
Closes https://github.com/facebook/react-native/pull/8569

Differential Revision: D3558869

Pulled By: astreet

fbshipit-source-id: 61fa82eb26001d2b8c2ea69c35bf3eb5ce5454ba

2016-07-13 18:58:20 -07:00

android/app

Cleanup UIExplorer folder

2016-07-12 05:59:13 -07:00

Initial implementation of requestIdleCallback on Android

2016-07-13 18:58:20 -07:00

UIExplorer

Fix UIExplorer example AppDelegate.m for pre-bundle comment

2016-07-13 02:13:24 -07:00

UIExplorer.xcodeproj

Cleanup UIExplorer folder

2016-07-12 05:59:13 -07:00

UIExplorerIntegrationTests

Cleanup UIExplorer folder

2016-07-12 05:59:13 -07:00

UIExplorerUnitTests

Cleanup UIExplorer folder

2016-07-12 05:59:13 -07:00

README.md

Allow building UIExplorer with Buck

2016-04-12 13:05:24 -07:00

README.md

UIExplorer

The UIExplorer is a sample app that showcases React Native views and modules.

Running this app

Before running the app, make sure you ran:

git clone https://github.com/facebook/react-native.git
cd react-native
npm install

Running on iOS

Mac OS and Xcode are required.

Open Examples/UIExplorer/UIExplorer.xcodeproj in Xcode
Hit the Run button

See Running on device if you want to use a physical device.

Running on Android

You'll need to have all the prerequisites (SDK, NDK) for Building React Native installed.

Start an Android emulator (Genymotion is recommended).

cd react-native
./gradlew :Examples:UIExplorer:android:app:installDebug
./packager/packager.sh

Note: Building for the first time can take a while.

Open the UIExplorer app in your emulator.

See Running on Device in case you want to use a physical device.

Running with Buck

Follow the same setup as running with gradle.

Install Buck from here.

Run the following commands from the react-native folder:

./gradlew :ReactAndroid:packageReactNdkLibsForBuck
buck fetch uiexplorer
buck install -r uiexplorer
./packager/packager.sh

Note: The native libs are still built using gradle. Full build with buck is coming soon(tm).

Built from source

Building the app on both iOS and Android means building the React Native framework from source. This way you're running the latest native and JS code the way you see it in your clone of the github repo.

This is different from apps created using react-native init which have a dependency on a specific version of React Native JS and native code, declared in a package.json file (and build.gradle for Android apps).