Fix a monkey crash in Developer settings.

- DevSetting shouldn't add switchbar listener if it's a Monkey test run
- DevSetting shouldn't remove switchbar listener if it's not registered
- Refactor some switchbar logic in order to create test

Change-Id: Ie65ff9b04778075789010169039393bd0551acfb
Fix: 64021498
Test: robotests

src/com/android/settings/development/DevelopmentSettings.java

@@ -354,6 +354,7 @@ public class DevelopmentSettings extends RestrictedSettingsFragment
     private Dialog mLogpersistClearDialog;
     private DashboardFeatureProvider mDashboardFeatureProvider;
     private DevelopmentSettingsEnabler mSettingsEnabler;
+    private DevelopmentSwitchBarController mSwitchBarController;
     private BugReportPreferenceController mBugReportController;
     private BugReportInPowerPreferenceController mBugReportInPowerController;
     private TelephonyMonitorPreferenceController mTelephonyMonitorController;
@@ -622,18 +623,9 @@ public class DevelopmentSettings extends RestrictedSettingsFragment
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
 
-        final SettingsActivity activity = (SettingsActivity) getActivity();
-
-        mSwitchBar = activity.getSwitchBar();
-        if (mUnavailable) {
-            mSwitchBar.setEnabled(false);
-            return;
-        }
-
-        if (Utils.isMonkeyRunning()) {
-            return;
-        }
-        mSwitchBar.addOnSwitchChangeListener(this);
+        mSwitchBar = ((SettingsActivity) getActivity()).getSwitchBar();
+        mSwitchBarController = new DevelopmentSwitchBarController(
+                this /* DevelopmentSettings */, mSwitchBar, !mUnavailable,  getLifecycle());
     }
 
     private boolean removePreferenceForProduction(Preference preference) {
@@ -760,8 +752,6 @@ public class DevelopmentSettings extends RestrictedSettingsFragment
         if (mUnavailable) {
             return;
         }
-        mSwitchBar.removeOnSwitchChangeListener(this);
-        mSwitchBar.hide();
         getActivity().unregisterReceiver(mUsbReceiver);
         getActivity().unregisterReceiver(mBluetoothA2dpReceiver);
         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

src/com/android/settings/development/DevelopmentSwitchBarController.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.development;
+
+import com.android.settings.Utils;
+import com.android.settings.widget.SwitchBar;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+
+public class DevelopmentSwitchBarController implements LifecycleObserver, OnStart, OnStop {
+
+    private final SwitchBar mSwitchBar;
+    private final boolean mIsAvailable;
+    private final DevelopmentSettings mSettings;
+
+    public DevelopmentSwitchBarController(DevelopmentSettings settings, SwitchBar switchBar,
+            boolean isAvailable, Lifecycle lifecycle) {
+        mSwitchBar = switchBar;
+        mIsAvailable = isAvailable && !Utils.isMonkeyRunning();
+        mSettings = settings;
+
+        if (mIsAvailable) {
+            lifecycle.addObserver(this);
+        } else {
+            mSwitchBar.setEnabled(false);
+        }
+    }
+
+    @Override
+    public void onStart() {
+        mSwitchBar.addOnSwitchChangeListener(mSettings);
+    }
+
+    @Override
+    public void onStop() {
+        mSwitchBar.removeOnSwitchChangeListener(mSettings);
+    }
+}