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Kudo Chien 6a3d9c06ce Fix Picker.onValueChange on Android sometimes not fired due to race condition (#22821 )

Summary:
Changelog:
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[Android] [Fixed] - Fix Picker.onValueChange sometimes not fired due to race condition. Fixes #15556

Root Cause:
------------

Please check my code snippet at https://snack.expo.io/kudochien/android-picker-issue
and try to select different items on Picker to see if console.log() hit.
If calling setState() with some latency, e.g. setTimeout() or changes from redux,
the second time changing picker item on UI, the onValueChange() will be not fired.

The root cause comes from the `forceUpdate` in PickerAndroid.android.js.
If user's setState() update comes after forceUpdate(), the flow will be:
1. First time select picker item
2. onValueChange + forceUpdate
3. user's setState() + componentDidUpdate + setNativeProps({ selected: ... })
4. mSuppressNextEvent = true
5. Second time select picker item
6. Since mSuppressNextEvent is true, the onValueChange will not be fired.

Solution:
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Like other controlled components, disable change listener during setup values from JS.
Android Spinner `setSelection(int position)` is asynchronous call, i.e. will fire onItemSelected in next run loop and is not suitable for us.
`setSelection(int position, boolean animate)`, however, is synchronous call which I used.

Some more references about setSelection:
https://stackoverflow.com/a/43512925/2590265
http://androidxref.com/8.1.0_r33/xref/frameworks/base/core/java/android/widget/AbsSpinner.java#276
The two arguments version will use `setSelectionInt()` which set mBlockLayoutRequests as true to prevent onItemSelected call from next layout().

I also moved the setOnItemSelectedListener() call after onLayout to prevent onValueChange() during intialization.
Pull Request resolved: https://github.com/facebook/react-native/pull/22821

Differential Revision: D13731979

Pulled By: cpojer

fbshipit-source-id: e06bd9aa62463b66c8f3fd7214485898d5375054

2019-01-18 08:12:12 -08:00

libs

Reformat xplat build files according to new formatting rules.

2019-01-10 20:00:42 -08:00

src

Fix Picker.onValueChange on Android sometimes not fired due to race condition (#22821 )

2019-01-18 08:12:12 -08:00

.npmignore

Don't publish /ReactAndroid/build to npm, update version on master

2015-10-12 11:11:40 -07:00

build.gradle

Remove unused files and code for old JSC and gcc build (#23014 )