cmsdk: preference: Add SecureSettingSwitchPreference

We may need to store/retrieve secure settings in some cases.

Change-Id: Ibf329652d8d057485e39060c956846755c3a91d2

sdk/src/java/cyanogenmod/preference/SecureSettingSwitchPreference.java

@@ -0,0 +1,63 @@
+/**
+ * Copyright (C) 2014-2016 The CyanogenMod 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 cyanogenmod.preference;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.util.AttributeSet;
+
+public class SecureSettingSwitchPreference extends SelfRemovingSwitchPreference {
+
+    public SecureSettingSwitchPreference(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public SecureSettingSwitchPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public SecureSettingSwitchPreference(Context context) {
+        super(context, null);
+    }
+
+    @Override
+    protected boolean persistBoolean(boolean value) {
+        if (shouldPersist()) {
+            if (value == getPersistedBoolean(!value)) {
+                // It's already there, so the same as persisting
+                return true;
+            }
+            Settings.Secure.putInt(getContext().getContentResolver(), getKey(), value ? 1 : 0);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    protected boolean getPersistedBoolean(boolean defaultReturnValue) {
+        if (!shouldPersist()) {
+            return defaultReturnValue;
+        }
+        return Settings.Secure.getInt(getContext().getContentResolver(),
+                getKey(), defaultReturnValue ? 1 : 0) != 0;
+    }
+
+    @Override
+    protected boolean isPersisted() {
+        return Settings.Secure.getString(getContext().getContentResolver(), getKey()) != null;
+    }
+}