Make sure that a valid GL context is available before generating Disp…

…layLists

Summary: There were cases in which we were trying to create DisplayLists before a valid Context was available. This fixes it by checking that the Activity's DecorView has been drawn at least once.

Reviewed By: emilsjolander, IanChilds, muraziz

Differential Revision: D4914956

fbshipit-source-id: 2421f658c1ad2a45bc7b68e67a154804c35fe263

litho-core/src/main/java/com/facebook/litho/LayoutState.java

@@ -30,6 +30,7 @@
 import android.support.v4.view.accessibility.AccessibilityManagerCompat;
 import android.text.TextUtils;
 import android.view.View;
+import android.view.Window;
 import android.view.accessibility.AccessibilityManager;
 
 import com.facebook.litho.animation.AnimationBinding;
@@ -1010,6 +1011,18 @@ private static void collectDisplayLists(LayoutState layoutState) {
       return;
     }
 
+    // If we have no window or the hierarchy has never been drawn before we cannot guarantee that
+    // a valid GL context exists. In this case just bail.
+    final Window window = activity.getWindow();
+    if (window == null) {
+      return;
+    }
+
+    final View decorView = window.getDecorView();
+    if (decorView == null || decorView.getDrawingTime() == 0) {
+      return;
+    }
+
     for (int i = 0, count = layoutState.getMountableOutputCount(); i < count; i++) {
       final LayoutOutput output = layoutState.getMountableOutputAt(i);
       final Component component = output.getComponent();