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[android] Fix re-attaching ScreenContainer to window (#272)

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Code to reproduce and test: https://snack.expo.io/@angelikaserwa/humiliated-bagel.
Switch to the Settings tab, then go back to the Home tab and press the details button. Nothing happens. It was because after re-attaching we were using a destroyed FragmentManager that was cached inside the ScreenContainer class. 
Then, when we go back from Details to Home screen, using a hardware back button, an exception occured: `The specified child already has a parent. You must call removeView() on the child's parent first`.
I fixed this by calling `removeAllViews()` when detaching container from window and forcing an update on re-attach.
This commit is contained in:
Angelika Serwa
2020-01-17 22:13:58 +01:00
committed by Krzysztof Magiera
parent 518c094657
commit 3fc74e29ab
2 changed files with 21 additions and 22 deletions
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24
android/src/main/java/com/swmansion/rnscreens/ScreenStack.java
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@@ -22,7 +22,7 @@ public class ScreenStack extends ScreenContainer<ScreenStackFragment> {
private final FragmentManager.OnBackStackChangedListener mBackStackListener = new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
if (getFragmentManager().getBackStackEntryCount() == 0) {
if (mFragmentManager.getBackStackEntryCount() == 0) {
// when back stack entry count hits 0 it means the user's navigated back using hw back
// button. As the "fake" transaction we installed on the back stack does nothing we need
// to handle back navigation on our own.
@@ -70,24 +70,22 @@ public class ScreenStack extends ScreenContainer<ScreenStackFragment> {
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
FragmentManager fm = getFragmentManager();
fm.removeOnBackStackChangedListener(mBackStackListener);
getFragmentManager().unregisterFragmentLifecycleCallbacks(mLifecycleCallbacks);
if (!fm.isStateSaved()) {
mFragmentManager.removeOnBackStackChangedListener(mBackStackListener);
mFragmentManager.unregisterFragmentLifecycleCallbacks(mLifecycleCallbacks);
if (!mFragmentManager.isStateSaved()) {
// state save means that the container where fragment manager was installed has been unmounted.
// This could happen as a result of dismissing nested stack. In such a case we don't need to
// reset back stack as it'd result in a crash caused by the fact the fragment manager is no
// longer attached.
fm.popBackStack(BACK_STACK_TAG, FragmentManager.POP_BACK_STACK_INCLUSIVE);
mFragmentManager.popBackStack(BACK_STACK_TAG, FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
super.onDetachedFromWindow();
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
getFragmentManager().registerFragmentLifecycleCallbacks(mLifecycleCallbacks, false);
mFragmentManager.registerFragmentLifecycleCallbacks(mLifecycleCallbacks, false);
}
@Override
@@ -230,8 +228,8 @@ public class ScreenStack extends ScreenContainer<ScreenStackFragment> {
// notified when it gets resumed so that we can install the handler.
return;
}
getFragmentManager().removeOnBackStackChangedListener(mBackStackListener);
getFragmentManager().popBackStack(BACK_STACK_TAG, FragmentManager.POP_BACK_STACK_INCLUSIVE);
mFragmentManager.removeOnBackStackChangedListener(mBackStackListener);
mFragmentManager.popBackStack(BACK_STACK_TAG, FragmentManager.POP_BACK_STACK_INCLUSIVE);
ScreenStackFragment firstScreen = null;
for (int i = 0, size = mStack.size(); i < size; i++) {
ScreenStackFragment screen = mStack.get(i);
@@ -241,14 +239,14 @@ public class ScreenStack extends ScreenContainer<ScreenStackFragment> {
}
}
if (topScreen != firstScreen && topScreen.isDismissable()) {
getFragmentManager()
mFragmentManager
.beginTransaction()
.hide(topScreen)
.show(topScreen)
.addToBackStack(BACK_STACK_TAG)
.setPrimaryNavigationFragment(topScreen)
.commitAllowingStateLoss();
getFragmentManager().addOnBackStackChangedListener(mBackStackListener);
mFragmentManager.addOnBackStackChangedListener(mBackStackListener);
}
}
}