Bug 722752 - Show/hide sync banner when sync accounts are added/removed (r=mfinkle)

mobile/android/base/AboutHomeContent.java

@@ -59,6 +59,7 @@ import org.mozilla.gecko.sync.setup.activities.SetupSyncActivity;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
+import android.accounts.OnAccountsUpdateListener;
 import android.app.Activity;
 import android.content.ContentResolver;
 import android.content.Context;
@@ -110,6 +111,8 @@ public class AboutHomeContent extends ScrollView {
     UriLoadCallback mUriLoadCallback = null;
     private LayoutInflater mInflater;
 
+    private AccountManager mAccountManager;
+
     protected SimpleCursorAdapter mTopSitesAdapter;
     protected GridView mTopSitesGrid;
 
@@ -125,6 +128,26 @@ public class AboutHomeContent extends ScrollView {
         mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         mInflater.inflate(R.layout.abouthome_content, this);
 
+        mAccountManager = AccountManager.get(context);
+
+        // The listener will run on the background thread (see 2nd argument)
+        mAccountManager.addOnAccountsUpdatedListener(new OnAccountsUpdateListener() {
+            public void onAccountsUpdated(Account[] accounts) {
+                final GeckoApp.StartupMode startupMode = GeckoApp.mAppContext.getStartupMode();
+                final boolean syncIsSetup = isSyncSetup();
+
+                GeckoApp.mAppContext.mMainHandler.post(new Runnable() {
+                    public void run() {
+                        // The listener might run before the UI is initially updated.
+                        // In this case, we should simply wait for the initial setup
+                        // to happen.
+                        if (mTopSitesAdapter != null)
+                            updateLayout(startupMode, syncIsSetup);
+                    }
+                });
+            }
+        }, GeckoAppShell.getHandler(), true);
+
         setScrollContainer(true);
         setBackgroundResource(R.drawable.abouthome_bg_repeat);
 
@@ -226,8 +249,7 @@ public class AboutHomeContent extends ScrollView {
     }
 
     private boolean isSyncSetup() {
-        AccountManager accountManager = AccountManager.get(getContext());
-        Account[] accounts = accountManager.getAccountsByType("org.mozilla.firefox_sync");
+        Account[] accounts = mAccountManager.getAccountsByType("org.mozilla.firefox_sync");
         return accounts.length > 0;
     }