cmsdk: Add GlobalSettingSwitchPreference class

We need to add toggles for some AOSP global settings,
such as heads up notifications.

Change-Id: I5e3cc8717c639bed4ee99e40c350ef7e7c2d76bd

api/cm_current.txt

@@ -867,6 +867,15 @@ package cyanogenmod.preference {
     method protected boolean persistBoolean(boolean);
   }
 
+  public class GlobalSettingSwitchPreference extends cyanogenmod.preference.SelfRemovingSwitchPreference {
+    ctor public GlobalSettingSwitchPreference(android.content.Context, android.util.AttributeSet, int);
+    ctor public GlobalSettingSwitchPreference(android.content.Context, android.util.AttributeSet);
+    ctor public GlobalSettingSwitchPreference(android.content.Context);
+    method protected boolean getPersistedBoolean(boolean);
+    method protected boolean isPersisted();
+    method protected boolean persistBoolean(boolean);
+  }
+
   public class RemotePreference extends cyanogenmod.preference.SelfRemovingPreference {
     ctor public RemotePreference(android.content.Context, android.util.AttributeSet, int, int);
     ctor public RemotePreference(android.content.Context, android.util.AttributeSet, int);

sdk/src/java/cyanogenmod/preference/GlobalSettingSwitchPreference.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 GlobalSettingSwitchPreference extends SelfRemovingSwitchPreference {
+
+    public GlobalSettingSwitchPreference(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public GlobalSettingSwitchPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public GlobalSettingSwitchPreference(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.Global.putInt(getContext().getContentResolver(), getKey(), value ? 1 : 0);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    protected boolean getPersistedBoolean(boolean defaultReturnValue) {
+        if (!shouldPersist()) {
+            return defaultReturnValue;
+        }
+        return Settings.Global.getInt(getContext().getContentResolver(),
+                getKey(), defaultReturnValue ? 1 : 0) != 0;
+    }
+
+    @Override
+    protected boolean isPersisted() {
+        return Settings.Global.getString(getContext().getContentResolver(), getKey()) != null;
+    }
+}