Show the license dialog only if the activity is still showing

Bug: 6888990
Change-Id: Ide267739c7fd296356f26293f02bd794906fbd0a
diff --git a/src/com/android/settings/SettingsLicenseActivity.java b/src/com/android/settings/SettingsLicenseActivity.java
index b9efa72..3d66b77 100644
--- a/src/com/android/settings/SettingsLicenseActivity.java
+++ b/src/com/android/settings/SettingsLicenseActivity.java
@@ -203,7 +203,9 @@
             @Override
             public void onPageFinished(WebView view, String url) {
                 mSpinnerDlg.dismiss();
-                mTextDlg.show();
+                if (SettingsLicenseActivity.this.isResumed()) {
+                    mTextDlg.show();
+                }
             }
         });