Restore share sheet height when toggling dark mode

This CL does the following changes:
- Save and restore the resolver drawer layout height.
This is necessary because when we toggle darkmode,
we don't go through handleLayoutChange, thus we don't
recalculate the height the standard way.
- Disables saving state for the viewpager.
This is necessary, because the content is
incorrectly restored afterwards. It's better to
reload it instead.
- Saves and restores the last selected tab. This is
necessary because with the viewpager state saving
disabled, it defaults to the first tab.

I considered updating the configChanges attribute in
the manifest to include dark mode toggling, but it
gave unsatisfactory result - the share sheet only
partially became dark.

Test: manual
Test: atest ChooserActivityTest
Test: atest ResolverActivityTest
Fixes: 154526324
Change-Id: I99e159ea7ca413f8acbc0429a43ce5aba32a1b28

core/java/com/android/internal/app/ResolverActivity.java

@@ -146,6 +146,7 @@ public class ResolverActivity extends Activity implements
 
     private static final String TAG = "ResolverActivity";
     private static final boolean DEBUG = false;
+    private static final String LAST_SHOWN_TAB_KEY = "last_shown_tab_key";
 
     private boolean mRegistered;
 
@@ -843,10 +844,20 @@ public class ResolverActivity extends Activity implements
         }
     }
 
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        ViewPager viewPager = findViewById(R.id.profile_pager);
+        outState.putInt(LAST_SHOWN_TAB_KEY, viewPager.getCurrentItem());
+    }
+
     @Override
     protected void onRestoreInstanceState(Bundle savedInstanceState) {
         super.onRestoreInstanceState(savedInstanceState);
         resetButtonBar();
+        ViewPager viewPager = findViewById(R.id.profile_pager);
+        viewPager.setCurrentItem(savedInstanceState.getInt(LAST_SHOWN_TAB_KEY));
+        mMultiProfilePagerAdapter.clearInactiveProfileCache();
     }
 
     private boolean isHttpSchemeAndViewAction(Intent intent) {
@@ -1585,6 +1596,7 @@ public class ResolverActivity extends Activity implements
         TabHost tabHost = findViewById(R.id.profile_tabhost);
         tabHost.setup();
         ViewPager viewPager = findViewById(R.id.profile_pager);
+        viewPager.setSaveEnabled(false);
         TabHost.TabSpec tabSpec = tabHost.newTabSpec(TAB_TAG_PERSONAL)
                 .setContent(R.id.profile_pager)
                 .setIndicator(getString(R.string.resolver_personal_tab));

core/java/com/android/internal/widget/ResolverDrawerLayout.java

@@ -1084,6 +1084,7 @@ public class ResolverDrawerLayout extends ViewGroup {
     protected Parcelable onSaveInstanceState() {
         final SavedState ss = new SavedState(super.onSaveInstanceState());
         ss.open = mCollapsibleHeight > 0 && mCollapseOffset == 0;
+        ss.mCollapsibleHeightReserved = mCollapsibleHeightReserved;
         return ss;
     }
 
@@ -1092,6 +1093,7 @@ public class ResolverDrawerLayout extends ViewGroup {
         final SavedState ss = (SavedState) state;
         super.onRestoreInstanceState(ss.getSuperState());
         mOpenOnLayout = ss.open;
+        mCollapsibleHeightReserved = ss.mCollapsibleHeightReserved;
     }
 
     public static class LayoutParams extends MarginLayoutParams {
@@ -1142,6 +1144,7 @@ public class ResolverDrawerLayout extends ViewGroup {
 
     static class SavedState extends BaseSavedState {
         boolean open;
+        private int mCollapsibleHeightReserved;
 
         SavedState(Parcelable superState) {
             super(superState);
@@ -1150,12 +1153,14 @@ public class ResolverDrawerLayout extends ViewGroup {
         private SavedState(Parcel in) {
             super(in);
             open = in.readInt() != 0;
+            mCollapsibleHeightReserved = in.readInt();
         }
 
         @Override
         public void writeToParcel(Parcel out, int flags) {
             super.writeToParcel(out, flags);
             out.writeInt(open ? 1 : 0);
+            out.writeInt(mCollapsibleHeightReserved);
         }
 
         public static final Parcelable.Creator<SavedState> CREATOR =