commit dd3964986a238109fdf7464fd12cc8ea173566a2
author Matthew Ng <ngmatthew@google.com> Thu May 31 13:30:27 2018 -0700
committer Matthew Ng <ngmatthew@google.com> Fri Jun 01 11:11:14 2018 -0700
tree aae68d9593fb6c878355c39e1ab3188ef628d8b7
parent 23ea118788477967db60a0f6940d77ee263a0519

Avoids systemui color tint flicker because no system ui flags set

Systemui nav buttons set the insensity from launcher and -1 window but
fallback home does not. This causes services to pass the wrong flags to
system ui to apply the incorrect tint that would later be fixed by
launcher and sometimes lead to color flicker.

Fixes: 79776583
Test: use bright color wallpaper (nav dark icons) and reboot phone,
unlock with pin/pass/finger and view nav buttons

Change-Id: I86906cd1b5af5d078499a1392c260aa186b2eee8

src/com/android/settings/FallbackHome.java

diff --git a/src/com/android/settings/FallbackHome.java b/src/com/android/settings/FallbackHome.java
index 5f7b639..84a3283 100644
--- a/src/com/android/settings/FallbackHome.java
+++ b/src/com/android/settings/FallbackHome.java
@@ -18,6 +18,8 @@
 
 import android.app.Activity;
 import android.app.ProgressDialog;
+import android.app.WallpaperColors;
+import android.app.WallpaperManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -68,15 +70,27 @@
         // we don't flash the wallpaper before SUW
         mProvisioned = Settings.Global.getInt(getContentResolver(),
                 Settings.Global.DEVICE_PROVISIONED, 0) != 0;
+        int flags;
         if (!mProvisioned) {
             setTheme(R.style.FallbackHome_SetupWizard);
-            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+            flags = View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
         } else {
-            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
+            flags = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
         }
 
+        // Set the system ui flags to light status bar if the wallpaper supports dark text to match
+        // current system ui color tints.
+        final WallpaperColors colors = getSystemService(WallpaperManager.class)
+                .getWallpaperColors(WallpaperManager.FLAG_SYSTEM);
+        if (colors != null
+                && (colors.getColorHints() & WallpaperColors.HINT_SUPPORTS_DARK_TEXT) != 0) {
+            flags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
+                    | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR;
+        }
+        getWindow().getDecorView().setSystemUiVisibility(flags);
+
         registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_USER_UNLOCKED));
         maybeFinish();
     }