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Fix #6228: Crash in Android dialog module.

Android dialog module has a race condition as a result of which it crashes.
See this issue:

The mIsInForeground flag is set on UI thread but was used from the ReactMethod thread.
Now all public methods of FragmentManagerHelper called from UI thread only.
Asserts are added in appropriate places to prevent future regressions.

Make sure that dialogs work after this change.
It will be nearly impossible to reproduce the issue manually but automatic regression tests should be able to catch this. At least our tests were crashing on some dialog scenarios from time to time.

[ANDROID] [MINOR] [BUGFIX] - Race condition fix in Android Dialogs module.
Closes #17392

Reviewed By: achen1

Differential Revision: D6708787

Pulled By: mdvacca

fbshipit-source-id: 99beb3ea3046286cc973f7677e98ff36f162b09b
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dryganets authored and facebook-github-bot committed Jan 12, 2018
1 parent 06ebaf2 commit d5e3f081c6b41697533775d378969fcf554c7290
Showing with 13 additions and 3 deletions.
  1. +13 −3 ReactAndroid/src/main/java/com/facebook/react/modules/dialog/
@@ -28,6 +28,7 @@
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.ReadableArray;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.UiThreadUtil;
import com.facebook.react.common.MapBuilder;
import com.facebook.react.module.annotations.ReactModule;
@@ -95,6 +96,7 @@ public FragmentManagerHelper( fragmentManager) {
public void showPendingAlert() {
if (mFragmentToShow == null) {
@@ -123,6 +125,8 @@ private void dismissExisting() {
public void showNewAlert(boolean isInForeground, Bundle arguments, Callback actionCallback) {
AlertFragmentListener actionListener =
@@ -218,8 +222,8 @@ public void onHostResume() {
public void showAlert(
ReadableMap options,
Callback errorCallback,
Callback actionCallback) {
FragmentManagerHelper fragmentManagerHelper = getFragmentManagerHelper();
final Callback actionCallback) {
final FragmentManagerHelper fragmentManagerHelper = getFragmentManagerHelper();
if (fragmentManagerHelper == null) {
errorCallback.invoke("Tried to show an alert while not attached to an Activity");
@@ -253,7 +257,13 @@ public void showAlert(
args.putBoolean(KEY_CANCELABLE, options.getBoolean(KEY_CANCELABLE));
fragmentManagerHelper.showNewAlert(mIsInForeground, args, actionCallback);
UiThreadUtil.runOnUiThread(new Runnable() {
public void run() {
fragmentManagerHelper.showNewAlert(mIsInForeground, args, actionCallback);

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