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

13 files changed, 195 insertions, 84 deletions

diff --git a/src/com/android/settings/DevelopmentSettings.java b/src/com/android/settings/DevelopmentSettings.java
index ce44907..5e5113b 100644
--- a/src/com/android/settings/DevelopmentSettings.java
+++ b/src/com/android/settings/DevelopmentSettings.java
@@ -167,7 +167,6 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
     private WifiManager mWifiManager;
 
     private SwitchBar mSwitchBar;
-    private Switch mEnabledSwitch;
     private boolean mLastEnabledState;
     private boolean mHaveDebugSettings;
     private boolean mDontPokeProperties;
@@ -386,11 +385,12 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         final SettingsActivity activity = (SettingsActivity) getActivity();
 
         mSwitchBar = activity.getSwitchBar();
-        mEnabledSwitch = mSwitchBar.getSwitch();
-        if (mUnavailable) {
-            mEnabledSwitch.setEnabled(false);
+       if (mUnavailable) {
+            mSwitchBar.setEnabled(false);
             return;
         }
+
+        mSwitchBar.addOnSwitchChangeListener(this);
     }
 
     private boolean removePreferenceForProduction(Preference preference) {
@@ -441,7 +441,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         final ContentResolver cr = getActivity().getContentResolver();
         mLastEnabledState = Settings.Global.getInt(cr,
                 Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) != 0;
-        mEnabledSwitch.setChecked(mLastEnabledState);
+        mSwitchBar.setChecked(mLastEnabledState);
         setPrefsEnabledState(mLastEnabledState);
 
         if (mHaveDebugSettings && !mLastEnabledState) {
@@ -452,17 +452,15 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
             Settings.Global.putInt(getActivity().getContentResolver(),
                     Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 1);
             mLastEnabledState = true;
-            mEnabledSwitch.setChecked(mLastEnabledState);
+            mSwitchBar.setChecked(mLastEnabledState);
             setPrefsEnabledState(mLastEnabledState);
         }
-
-        mSwitchBar.addOnSwitchChangeListener(this);
         mSwitchBar.show();
     }
 
     @Override
-    public void onPause() {
-        super.onPause();
+    public void onDestroyView() {
+        super.onDestroyView();
 
         mSwitchBar.removeOnSwitchChangeListener(this);
         mSwitchBar.hide();
@@ -1210,7 +1208,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
 
     @Override
     public void onSwitchChanged(Switch switchView, boolean isChecked) {
-        if (switchView != mEnabledSwitch) {
+        if (switchView != mSwitchBar.getSwitch()) {
             return;
         }
         if (isChecked != mLastEnabledState) {
@@ -1463,7 +1461,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
                 setPrefsEnabledState(mLastEnabledState);
             } else {
                 // Reset the toggle
-                mEnabledSwitch.setChecked(false);
+                mSwitchBar.setChecked(false);
             }
         }
     }
@@ -1477,7 +1475,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
             mAdbDialog = null;
         } else if (dialog == mEnableDialog) {
             if (!mDialogClicked) {
-                mEnabledSwitch.setChecked(false);
+                mSwitchBar.setChecked(false);
             }
             mEnableDialog = null;
         }
diff --git a/src/com/android/settings/DreamSettings.java b/src/com/android/settings/DreamSettings.java
index 1175639..38cba7a 100644
--- a/src/com/android/settings/DreamSettings.java
+++ b/src/com/android/settings/DreamSettings.java
@@ -61,7 +61,6 @@ public class DreamSettings extends SettingsPreferenceFragment implements
     private DreamBackend mBackend;
     private DreamInfoAdapter mAdapter;
     private SwitchBar mSwitchBar;
-    private Switch mSwitch;
     private MenuItem[] mMenuItemsWhenEnabled;
     private boolean mRefreshing;
 
@@ -105,6 +104,9 @@ public class DreamSettings extends SettingsPreferenceFragment implements
     public void onDestroyView() {
         logd("onDestroyView()");
         super.onDestroyView();
+
+        mSwitchBar.removeOnSwitchChangeListener(this);
+        mSwitchBar.hide();
     }
 
     @Override
@@ -124,7 +126,8 @@ public class DreamSettings extends SettingsPreferenceFragment implements
 
         final SettingsActivity sa = (SettingsActivity) getActivity();
         mSwitchBar = sa.getSwitchBar();
-        mSwitch = mSwitchBar.getSwitch();
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
     }
 
     @Override
@@ -212,9 +215,6 @@ public class DreamSettings extends SettingsPreferenceFragment implements
         super.onPause();
 
         mContext.unregisterReceiver(mPackageReceiver);
-
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
     }
 
     @Override
@@ -231,9 +231,6 @@ public class DreamSettings extends SettingsPreferenceFragment implements
         filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
         filter.addDataScheme(PACKAGE_SCHEME);
         mContext.registerReceiver(mPackageReceiver , filter);
-
-        mSwitchBar.addOnSwitchChangeListener(this);
-        mSwitchBar.show();
     }
 
     public static int getSummaryResource(Context context) {
@@ -263,8 +260,8 @@ public class DreamSettings extends SettingsPreferenceFragment implements
         logd("refreshFromBackend()");
         mRefreshing = true;
         boolean dreamsEnabled = mBackend.isEnabled();
-        if (mSwitch.isChecked() != dreamsEnabled)
-            mSwitch.setChecked(dreamsEnabled);
+        if (mSwitchBar.isChecked() != dreamsEnabled)
+            mSwitchBar.setChecked(dreamsEnabled);
 
         mAdapter.clear();
         if (dreamsEnabled) {
diff --git a/src/com/android/settings/accessibility/CaptionPropertiesFragment.java b/src/com/android/settings/accessibility/CaptionPropertiesFragment.java
index 41c80ae..53d614d 100644
--- a/src/com/android/settings/accessibility/CaptionPropertiesFragment.java
+++ b/src/com/android/settings/accessibility/CaptionPropertiesFragment.java
@@ -142,27 +142,30 @@ public class CaptionPropertiesFragment extends SettingsPreferenceFragment
                 refreshPreviewText();
             }
         });
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
 
+        final boolean enabled = mCaptioningManager.isEnabled();
         SettingsActivity activity = (SettingsActivity) getActivity();
         mSwitchBar = activity.getSwitchBar();
+        mSwitchBar.setTextViewLabel(enabled);
         mToggleSwitch = mSwitchBar.getSwitch();
         mToggleSwitch.setCheckedInternal(enabled);
 
         getPreferenceScreen().setEnabled(enabled);
 
         refreshPreviewText();
-    }
 
-    @Override
-    public void onResume() {
-        super.onResume();
         installSwitchBarToggleSwitch();
     }
 
     @Override
-    public void onPause() {
+    public void onDestroyView() {
+        super.onDestroyView();
         removeSwitchBarToggleSwitch();
-        super.onPause();
     }
 
     private void refreshPreviewText() {
diff --git a/src/com/android/settings/accessibility/ToggleFeaturePreferenceFragment.java b/src/com/android/settings/accessibility/ToggleFeaturePreferenceFragment.java
index 331c0e3..bc21759 100644
--- a/src/com/android/settings/accessibility/ToggleFeaturePreferenceFragment.java
+++ b/src/com/android/settings/accessibility/ToggleFeaturePreferenceFragment.java
@@ -95,17 +95,17 @@ public abstract class ToggleFeaturePreferenceFragment
     }
 
     @Override
-    public void onResume() {
-        super.onResume();
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
 
         installActionBarToggleSwitch();
     }
 
     @Override
-    public void onPause() {
-        removeActionBarToggleSwitch();
+    public void onDestroyView() {
+        super.onDestroyView();
 
-        super.onPause();
+        removeActionBarToggleSwitch();
     }
 
     protected abstract void onPreferenceToggled(String preferenceKey, boolean enabled);
diff --git a/src/com/android/settings/bluetooth/BluetoothEnabler.java b/src/com/android/settings/bluetooth/BluetoothEnabler.java
index be03b63..45f3d06 100644
--- a/src/com/android/settings/bluetooth/BluetoothEnabler.java
+++ b/src/com/android/settings/bluetooth/BluetoothEnabler.java
@@ -89,6 +89,16 @@ public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener
         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
     }
 
+    public void setupSwitchBar() {
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
+    }
+
+    public void teardownSwitchBar() {
+        mSwitchBar.removeOnSwitchChangeListener(this);
+        mSwitchBar.hide();
+    }
+
     public void resume(Context context) {
         if (mLocalAdapter == null) {
             mSwitch.setEnabled(false);
@@ -103,8 +113,6 @@ public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener
         handleStateChanged(mLocalAdapter.getBluetoothState());
 
         mContext.registerReceiver(mReceiver, mIntentFilter);
-        mSwitchBar.addOnSwitchChangeListener(this);
-        mSwitchBar.show();
         mValidListener = true;
     }
 
@@ -114,8 +122,6 @@ public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener
         }
 
         mContext.unregisterReceiver(mReceiver);
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
         mValidListener = false;
     }
 
diff --git a/src/com/android/settings/bluetooth/BluetoothSettings.java b/src/com/android/settings/bluetooth/BluetoothSettings.java
index dd4edff..eb318cd 100755
--- a/src/com/android/settings/bluetooth/BluetoothSettings.java
+++ b/src/com/android/settings/bluetooth/BluetoothSettings.java
@@ -119,6 +119,14 @@ public final class BluetoothSettings extends DeviceListPreferenceFragment implem
         mSwitchBar = activity.getSwitchBar();
 
         mBluetoothEnabler = new BluetoothEnabler(activity, mSwitchBar);
+        mBluetoothEnabler.setupSwitchBar();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        mBluetoothEnabler.teardownSwitchBar();
     }
 
     @Override
diff --git a/src/com/android/settings/location/LocationSettings.java b/src/com/android/settings/location/LocationSettings.java
index 8794a8d..b10d4b6 100644
--- a/src/com/android/settings/location/LocationSettings.java
+++ b/src/com/android/settings/location/LocationSettings.java
@@ -73,6 +73,16 @@ public class LocationSettings extends LocationSettingsBase
 
         mSwitchBar = activity.getSwitchBar();
         mSwitch = mSwitchBar.getSwitch();
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+
+        mSwitchBar.removeOnSwitchChangeListener(this);
+        mSwitchBar.hide();
     }
 
     @Override
@@ -84,8 +94,6 @@ public class LocationSettings extends LocationSettingsBase
     public void onResume() {
         super.onResume();
         createPreferenceHierarchy();
-        mSwitchBar.addOnSwitchChangeListener(this);
-        mSwitchBar.show();
         mValidListener = true;
     }
 
@@ -97,8 +105,6 @@ public class LocationSettings extends LocationSettingsBase
             // Ignore exceptions caused by race condition
         }
         super.onPause();
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
         mValidListener = false;
     }
 
diff --git a/src/com/android/settings/nfc/AndroidBeam.java b/src/com/android/settings/nfc/AndroidBeam.java
index eb3ff9b..add0fa7 100644
--- a/src/com/android/settings/nfc/AndroidBeam.java
+++ b/src/com/android/settings/nfc/AndroidBeam.java
@@ -33,7 +33,6 @@ public class AndroidBeam extends Fragment
     private View mView;
     private NfcAdapter mNfcAdapter;
     private SwitchBar mSwitchBar;
-    private Switch mSwitch;
     private CharSequence mOldActivityTitle;
 
     @Override
@@ -63,46 +62,33 @@ public class AndroidBeam extends Fragment
         SettingsActivity activity = (SettingsActivity) getActivity();
 
         mSwitchBar = activity.getSwitchBar();
-        mSwitch = mSwitchBar.getSwitch();
-        mSwitch.setChecked(mNfcAdapter.isNdefPushEnabled());
-    }
-
-    @Override
-    public void onResume() {
-        super.onResume();
-
+        mSwitchBar.setChecked(mNfcAdapter.isNdefPushEnabled());
         mSwitchBar.addOnSwitchChangeListener(this);
         mSwitchBar.show();
     }
 
     @Override
-    public void onPause() {
-        super.onPause();
-
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
-    }
-
-    @Override
     public void onDestroyView() {
         super.onDestroyView();
         if (mOldActivityTitle != null) {
             getActivity().getActionBar().setTitle(mOldActivityTitle);
         }
+        mSwitchBar.removeOnSwitchChangeListener(this);
+        mSwitchBar.hide();
     }
 
     @Override
     public void onSwitchChanged(Switch switchView, boolean desiredState) {
         boolean success = false;
-        mSwitch.setEnabled(false);
+        mSwitchBar.setEnabled(false);
         if (desiredState) {
             success = mNfcAdapter.enableNdefPush();
         } else {
             success = mNfcAdapter.disableNdefPush();
         }
         if (success) {
-            mSwitch.setChecked(desiredState);
+            mSwitchBar.setChecked(desiredState);
         }
-        mSwitch.setEnabled(true);
+        mSwitchBar.setEnabled(true);
     }
 }
diff --git a/src/com/android/settings/notification/ZenModeSettings.java b/src/com/android/settings/notification/ZenModeSettings.java
index e9323d8..40e2c55 100644
--- a/src/com/android/settings/notification/ZenModeSettings.java
+++ b/src/com/android/settings/notification/ZenModeSettings.java
@@ -107,7 +107,6 @@ public class ZenModeSettings extends SettingsPreferenceFragment implements Index
     private final SettingsObserver mSettingsObserver = new SettingsObserver();
 
     private SwitchBar mSwitchBar;
-    private Switch mSwitch;
     private Context mContext;
     private PackageManager mPM;
     private ZenModeConfig mConfig;
@@ -159,7 +158,8 @@ public class ZenModeSettings extends SettingsPreferenceFragment implements Index
         if (DEBUG) Log.d(TAG, "Loaded mConfig=" + mConfig);
 
         mSwitchBar = ((SettingsActivity) mContext).getSwitchBar();
-        mSwitch = mSwitchBar.getSwitch();
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
 
         final PreferenceCategory general = (PreferenceCategory) root.findPreference(KEY_GENERAL);
 
@@ -400,14 +400,17 @@ public class ZenModeSettings extends SettingsPreferenceFragment implements Index
         updateControls();
         updateZenMode();
         mSettingsObserver.register();
-        mSwitchBar.addOnSwitchChangeListener(this);
-        mSwitchBar.show();
     }
 
     @Override
     public void onPause() {
         super.onPause();
         mSettingsObserver.unregister();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
         mSwitchBar.removeOnSwitchChangeListener(this);
         mSwitchBar.hide();
     }
@@ -415,8 +418,8 @@ public class ZenModeSettings extends SettingsPreferenceFragment implements Index
     private void updateZenMode() {
         final boolean zenMode = Global.getInt(getContentResolver(),
                 Global.ZEN_MODE, Global.ZEN_MODE_OFF) != Global.ZEN_MODE_OFF;
-        if (mSwitch.isChecked() != zenMode) {
-            mSwitch.setChecked(zenMode);
+        if (mSwitchBar.isChecked() != zenMode) {
+            mSwitchBar.setChecked(zenMode);
             mIgnoreNext = true;
         }
     }
diff --git a/src/com/android/settings/print/PrintServiceSettingsFragment.java b/src/com/android/settings/print/PrintServiceSettingsFragment.java
index 872f7b8..c68f131 100644
--- a/src/com/android/settings/print/PrintServiceSettingsFragment.java
+++ b/src/com/android/settings/print/PrintServiceSettingsFragment.java
@@ -143,16 +143,12 @@ public class PrintServiceSettingsFragment extends SettingsPreferenceFragment
         mSettingsContentObserver.register(getContentResolver());
         updateEmptyView();
         updateUiForServiceState();
-        mSwitchBar.addOnSwitchChangeListener(this);
-        mSwitchBar.show();
     }
 
     @Override
     public void onPause() {
         mSettingsContentObserver.unregister(getContentResolver());
         super.onPause();
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
     }
 
     @Override
@@ -168,6 +164,8 @@ public class PrintServiceSettingsFragment extends SettingsPreferenceFragment
             getActivity().getActionBar().setTitle(mOldActivityTitle);
         }
         super.onDestroyView();
+        mSwitchBar.removeOnSwitchChangeListener(this);
+        mSwitchBar.hide();
     }
 
     private void onPreferenceToggled(String preferenceKey, boolean enabled) {
@@ -292,6 +290,8 @@ public class PrintServiceSettingsFragment extends SettingsPreferenceFragment
         final SettingsActivity activity = (SettingsActivity) getActivity();
 
         mSwitchBar = activity.getSwitchBar();
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
 
         mToggleSwitch = mSwitchBar.getSwitch();
         mToggleSwitch.setOnBeforeCheckedChangeListener(new ToggleSwitch.OnBeforeCheckedChangeListener() {
diff --git a/src/com/android/settings/widget/SwitchBar.java b/src/com/android/settings/widget/SwitchBar.java
index bc06d87..b503cf6 100644
--- a/src/com/android/settings/widget/SwitchBar.java
+++ b/src/com/android/settings/widget/SwitchBar.java
@@ -17,10 +17,11 @@
 package com.android.settings.widget;
 
 import android.content.Context;
+import android.os.Parcel;
+import android.os.Parcelable;
 import android.transition.TransitionManager;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
-import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.CompoundButton;
@@ -72,12 +73,11 @@ public class SwitchBar extends LinearLayout implements CompoundButton.OnCheckedC
         mTextView.setText(R.string.switch_off_text);
 
         mSwitch = (ToggleSwitch) findViewById(R.id.switch_widget);
-        mSwitch.setOnCheckedChangeListener(this);
 
         addOnSwitchChangeListener(new OnSwitchChangeListener() {
             @Override
             public void onSwitchChanged(Switch switchView, boolean isChecked) {
-                mTextView.setText(isChecked ? R.string.switch_on_text : R.string.switch_off_text);
+                setTextViewLabel(isChecked);
             }
         });
 
@@ -90,18 +90,41 @@ public class SwitchBar extends LinearLayout implements CompoundButton.OnCheckedC
         setVisibility(View.GONE);
     }
 
-    public ToggleSwitch getSwitch() {
+    public void setTextViewLabel(boolean isChecked) {
+        mTextView.setText(isChecked ? R.string.switch_on_text : R.string.switch_off_text);
+    }
+
+    public void setChecked(boolean checked) {
+        setTextViewLabel(checked);
+        mSwitch.setChecked(checked);
+    }
+
+    public boolean isChecked() {
+        return mSwitch.isChecked();
+    }
+
+    public void setEnabled(boolean enabled) {
+        super.setEnabled(enabled);
+        mTextView.setEnabled(enabled);
+        mSwitch.setEnabled(false);
+    }
+
+    public final ToggleSwitch getSwitch() {
         return mSwitch;
     }
 
     public void show() {
-        TransitionManager.beginDelayedTransition((ViewGroup) getParent());
-        setVisibility(View.VISIBLE);
+        if (!isShowing()) {
+            setVisibility(View.VISIBLE);
+            mSwitch.setOnCheckedChangeListener(this);
+        }
     }
 
     public void hide() {
-        TransitionManager.beginDelayedTransition((ViewGroup) getParent());
-        setVisibility(View.GONE);
+        if (isShowing()) {
+            setVisibility(View.GONE);
+            mSwitch.setOnCheckedChangeListener(null);
+        }
     }
 
     public boolean isShowing() {
@@ -139,4 +162,69 @@ public class SwitchBar extends LinearLayout implements CompoundButton.OnCheckedC
         }
         mSwitchChangeListeners.remove(listener);
     }
+
+    static class SavedState extends BaseSavedState {
+        boolean checked;
+        boolean visible;
+
+        SavedState(Parcelable superState) {
+            super(superState);
+        }
+
+        /**
+         * Constructor called from {@link #CREATOR}
+         */
+        private SavedState(Parcel in) {
+            super(in);
+            checked = (Boolean)in.readValue(null);
+            visible = (Boolean)in.readValue(null);
+        }
+
+        @Override
+        public void writeToParcel(Parcel out, int flags) {
+            super.writeToParcel(out, flags);
+            out.writeValue(checked);
+            out.writeValue(visible);
+        }
+
+        @Override
+        public String toString() {
+            return "SwitchBar.SavedState{"
+                    + Integer.toHexString(System.identityHashCode(this))
+                    + " checked=" + checked
+                    + " visible=" + visible + "}";
+        }
+
+        public static final Parcelable.Creator<SavedState> CREATOR
+                = new Parcelable.Creator<SavedState>() {
+            public SavedState createFromParcel(Parcel in) {
+                return new SavedState(in);
+            }
+
+            public SavedState[] newArray(int size) {
+                return new SavedState[size];
+            }
+        };
+    }
+
+    @Override
+    public Parcelable onSaveInstanceState() {
+        Parcelable superState = super.onSaveInstanceState();
+
+        SavedState ss = new SavedState(superState);
+        ss.checked = mSwitch.isChecked();
+        ss.visible = isShowing();
+        return ss;
+    }
+
+    @Override
+    public void onRestoreInstanceState(Parcelable state) {
+        SavedState ss = (SavedState) state;
+
+        super.onRestoreInstanceState(ss.getSuperState());
+        mSwitch.setChecked(ss.checked);
+        setTextViewLabel(ss.checked);
+        setVisibility(ss.visible ? View.VISIBLE : View.GONE);
+        requestLayout();
+    }
 }
diff --git a/src/com/android/settings/wifi/WifiEnabler.java b/src/com/android/settings/wifi/WifiEnabler.java
index 9f0b6fa..a48598e 100644
--- a/src/com/android/settings/wifi/WifiEnabler.java
+++ b/src/com/android/settings/wifi/WifiEnabler.java
@@ -96,18 +96,24 @@ public class WifiEnabler implements SwitchBar.OnSwitchChangeListener  {
         mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
     }
 
+    public void setupSwitchBar() {
+        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar.show();
+    }
+
+    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);
-        mSwitchBar.addOnSwitchChangeListener(this);
-        mSwitchBar.show();
     }
 
     public void pause() {
         mContext.unregisterReceiver(mReceiver);
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
     }
 
     private void handleWifiStateChanged(int state) {
diff --git a/src/com/android/settings/wifi/WifiSettings.java b/src/com/android/settings/wifi/WifiSettings.java
index 604275a..b374fb7 100644
--- a/src/com/android/settings/wifi/WifiSettings.java
+++ b/src/com/android/settings/wifi/WifiSettings.java
@@ -405,6 +405,15 @@ public class WifiSettings extends RestrictedSettingsFragment
     }
 
     @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();
         }
     }