commit 8a9df95b91c15cd1923833acadceb0dce777a665 Author: Matthew Finkel <Matthew.Finkel@gmail.com> Date: Mon Apr 29 19:53:45 2019 +0000 Bug 30239 - Render Fragments after crash --- .../gecko/torbootstrap/TorBootstrapPager.java | 55 ++++++++++++++++++++-- 1 file changed, 50 insertions(+), 5 deletions(-) diff --git a/mobile/android/base/java/org/mozilla/gecko/torbootstrap/TorBootstrapPager.java b/mobile/android/base/java/org/mozilla/gecko/torbootstrap/TorBootstrapPager.java index 67cfe73d465a..587806791e52 100644 --- a/mobile/android/base/java/org/mozilla/gecko/torbootstrap/TorBootstrapPager.java +++ b/mobile/android/base/java/org/mozilla/gecko/torbootstrap/TorBootstrapPager.java @@ -52,7 +52,6 @@ public class TorBootstrapPager extends FirstrunPager { mActivity = activity; final List<TorBootstrapPagerConfig.TorBootstrapPanelConfig> panels = TorBootstrapPagerConfig.getDefaultBootstrapPanel(); - setAdapter(new ViewPagerAdapter(fm, panels)); this.pagerNavigation = new TorBootstrapPanel.PagerNavigation() { @Override public void next() { @@ -67,6 +66,38 @@ public class TorBootstrapPager extends FirstrunPager { } }; + ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(fm, panels); + setAdapter(viewPagerAdapter); + + // The Fragments (Panels) should be attached to a parent View at this point (and + // the parent View should be |this|). If the Fragment's getParent() method returns + // |null|, then the Fragment was probably instantiated earlier by the FragmentManager + // (most likely because the app's state is being restored after it was killed by the + // system). If the parent View is not null, then the Fragment was instantiated below + // in the ViewPagerAdapter constructor. + // + // In the case where the Fragment's getParent() is null, then the Fragment was + // instantiated before TorBootstrapPager (|this|) was created. As a result, the + // fragment wasn't automatically added as a child View of the Pager (|this|) when it + // was created. Add the Fragments as children now. + // + // There may be a more Androidy-way of handling this. + for (int i = 0; i < viewPagerAdapter.getCount(); i++) { + Fragment fragment = viewPagerAdapter.getItem(i); + if (fragment == null) { + continue; + } + + View fragmentView = fragment.getView(); + if (fragmentView == null) { + continue; + } + + if (fragmentView.getParent() == null) { + addView(fragmentView); + } + } + animateLoad(); } @@ -105,15 +136,29 @@ public class TorBootstrapPager extends FirstrunPager { public ViewPagerAdapter(FragmentManager fm, List<TorBootstrapPagerConfig.TorBootstrapPanelConfig> panels) { super(fm); this.panels = panels; - this.fragments = getPagerPanels(); + this.fragments = getPagerPanels(fm); } - private Fragment[] getPagerPanels() { + private Fragment[] getPagerPanels(FragmentManager fm) { Fragment[] fragments = new Fragment[panels.size()]; for (int i = 0; i < fragments.length; i++) { TorBootstrapPagerConfig.TorBootstrapPanelConfig panelConfig = panels.get(i); - // We know the class is within the "org.mozilla.gecko.torbootstrap" package namespace - fragments[i] = Fragment.instantiate(mActivity.getApplicationContext(), panelConfig.getClassname()); + + // Fragment tag is created as "android:switcher:" + viewId + ":" + id + // where |viewId| is the ID of the parent View container (in this case + // TorBootstrapPager is the parent View of the panels), and |id| is the + // position within the pager (in this case, it is |i| here) + // https://android.googlesource.com/platform/frameworks/support/+/refs/heads/ma... + String fragmentTag = "android:switcher:" + TorBootstrapPager.this.getId() + ":" + i; + + // If the Activity is being restored, then find the existing fragment. If the + // fragment doesn't exist, then instantiate it. + fragments[i] = fm.findFragmentByTag(fragmentTag); + if (fragments[i] == null) { + // We know the class is within the "org.mozilla.gecko.torbootstrap" package namespace + fragments[i] = Fragment.instantiate(mActivity.getApplicationContext(), panelConfig.getClassname()); + } + ((TorBootstrapPanel) fragments[i]).setPagerNavigation(pagerNavigation); ((TorBootstrapPanel) fragments[i]).setContext(mActivity); ((TorBootstrapPanel) fragments[i]).setBootstrapController(this);