Make the SwitchBar appear immediately

- change the way the SwitchBar is shown and hidden
- save its state
- remove the delay transition code

Change-Id: I07260430e6709b42517ca011f6d3c3446a626731

src/com/android/settings/wifi/WifiEnabler.java

@@ -96,20 +96,26 @@ public class WifiEnabler implements SwitchBar.OnSwitchChangeListener  {
         mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
     }
 
-    public void resume(Context context) {
-        mContext = context;
-        // Wi-Fi state is sticky, so just let the receiver update UI
-        mContext.registerReceiver(mReceiver, mIntentFilter);
+    public void setupSwitchBar() {
         mSwitchBar.addOnSwitchChangeListener(this);
         mSwitchBar.show();
     }
 
-    public void pause() {
-        mContext.unregisterReceiver(mReceiver);
+    public void teardownSwitchBar() {
         mSwitchBar.removeOnSwitchChangeListener(this);
         mSwitchBar.hide();
     }
 
+    public void resume(Context context) {
+        mContext = context;
+        // Wi-Fi state is sticky, so just let the receiver update UI
+        mContext.registerReceiver(mReceiver, mIntentFilter);
+    }
+
+    public void pause() {
+        mContext.unregisterReceiver(mReceiver);
+    }
+
     private void handleWifiStateChanged(int state) {
         switch (state) {
             case WifiManager.WIFI_STATE_ENABLING:

src/com/android/settings/wifi/WifiSettings.java

@@ -404,6 +404,15 @@ public class WifiSettings extends RestrictedSettingsFragment
         setHasOptionsMenu(true);
     }
 
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        if (mWifiEnabler != null) {
+            mWifiEnabler.teardownSwitchBar();
+        }
+    }
+
     @Override
     public void onStart() {
         super.onStart();
@@ -414,6 +423,7 @@ public class WifiSettings extends RestrictedSettingsFragment
 
             mSwitchBar = activity.getSwitchBar();
             mWifiEnabler = new WifiEnabler(activity, mSwitchBar);
+            mWifiEnabler.setupSwitchBar();
         }
     }