Route switch preferences through SettingManager

This CL adds a custom switch which uses SettingsManager to control
boolean settings. It relocates SettingsManager to the application
to allow access from multiple activities.

Bug: 16327665
Change-Id: I6af084a4443ea79ca270dab382a66ea527897a38

1 files changed, 97 insertions, 0 deletions

diff --git a/src/com/android/camera/settings/ManagedSwitchPreference.java b/src/com/android/camera/settings/ManagedSwitchPreference.java
new file mode 100644
index 000000000..12ae0aa4f
--- /dev/null
+++ b/src/com/android/camera/settings/ManagedSwitchPreference.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2014 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.camera.settings;
+
+import android.app.Activity;
+import android.app.Application;
+import android.content.Context;
+
+import android.preference.SwitchPreference;
+import android.util.AttributeSet;
+
+import com.android.camera.app.CameraApp;
+
+/**
+ * This class allows Settings UIs to display and set boolean values controlled
+ * via the {@link SettingManager}. The Default {@link SwitchPreference} uses
+ * {@link android.content.SharedPreferences} as a backing store; since the
+ * {@link SettingManager} stores all settings as Strings we need to ensure we
+ * get and set boolean settings through the manager.
+ */
+public class ManagedSwitchPreference extends SwitchPreference {
+    public ManagedSwitchPreference(Context context) {
+        super(context);
+    }
+
+    public ManagedSwitchPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public ManagedSwitchPreference(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    @Override
+    public boolean getPersistedBoolean(boolean defaultReturnValue) {
+        CameraApp cameraApp = getCameraApp();
+        if (cameraApp == null) {
+            // The context and app may not be initialized upon initial inflation of the
+            // preference from XML. In that case return the default value.
+            return defaultReturnValue;
+        }
+        SettingsManager settingsManager = cameraApp.getSettingsManager();
+        if (settingsManager != null) {
+            return settingsManager.getBoolean(SettingsManager.SCOPE_GLOBAL, getKey());
+        } else {
+            // If the SettingsManager is for some reason not initialized,
+            // perhaps triggered by a monkey, return default value.
+            return defaultReturnValue;
+        }
+    }
+
+    @Override
+    public boolean persistBoolean(boolean value) {
+        CameraApp cameraApp = getCameraApp();
+        if (cameraApp == null) {
+            // The context may not be initialized upon initial inflation of the
+            // preference from XML. In that case return false to note the value won't
+            // be persisted.
+            return false;
+        }
+        SettingsManager settingsManager = cameraApp.getSettingsManager();
+        if (settingsManager != null) {
+            settingsManager.set(SettingsManager.SCOPE_GLOBAL, getKey(), value);
+            return true;
+        } else {
+            // If the SettingsManager is for some reason not initialized,
+            // perhaps triggered by a monkey, return false to note the value
+            // was not persisted.
+            return false;
+        }
+    }
+
+    private CameraApp getCameraApp() {
+        Context context = getContext();
+        if (context instanceof Activity) {
+            Application application = ((Activity) context).getApplication();
+            if (application instanceof CameraApp) {
+                return (CameraApp) application;
+            }
+        }
+        return null;
+    }
+}