Mtk Android(安卓)app 默认激活设备管理器

代码路径：
frameworks/base/services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyManagerService.java

流程：
每次开机时，loadSettingsLocked()方法会读取data/system/device_policies.xml文件
手动激活时，saveSettingsLocked()方法会写入对应的信息到data/system/device_policies.xml文件

具体方法：
先手动激活，然后pull出该文件，根据里面的多出的信息，在loadSettingsLocked()方法读取xml之前写入xml文件即可。

//写入标签名
out.startTag(null, “policies”);
//写入标签属性和值d
out.attribute(null, “flags”, “31”);
//关闭标签
out.endTag(null, “policies”);

================================================

/zhanghao add begin/
private void setSettingsLocked(int userHandle) {
JournaledFile journal = makeJournaledFile(userHandle);
FileOutputStream stream = null;
try {
stream = new FileOutputStream(journal.chooseForWrite(), false);
XmlSerializer out = new FastXmlSerializer();
out.setOutput(stream, StandardCharsets.UTF_

8.name());
out.startDocument(null, true);

        out.startTag(null, "policies");        out.attribute(null, ATTR_SETUP_COMPLETE,                Boolean.toString(true));            //com.xueleyun.xlylauncher            out.startTag(null, "admin");            out.attribute(null, "name", "com.xueleyun.xlylauncher/com.xueleyun.xlylauncher.deviceAdminReceiver");                 out.startTag(null, "policies");                 out.attribute(null, "flags", "31");                 out.endTag(null, "policies");                 out.startTag(null, "disable-bt-contacts-sharing");                 out.attribute(null, "value", "true");                out.endTag(null, "disable-bt-contacts-sharing");                out.endTag(null, "admin");                out.endTag(null, "policies");            out.endDocument();            stream.flush();            FileUtils.sync(stream);            stream.close();            journal.commit();            sendChangedNotification(userHandle);    } catch (IOException e) {        try {            if (stream != null) {                stream.close();            }        } catch (IOException ex) {            // Ignore        }        journal.rollback();    }}/*zhanghao add end*/private void loadSettingsLocked(DevicePolicyData policy, int userHandle) {    /*zhanghao add begin*/    String tempString = SystemProperties.get("persist.sys.firstboot", "");    boolean isFirstBoot = (tempString != null && "".equals(tempString)) ? true : false;    if (isFirstBoot) {        SystemProperties.set("persist.sys.firstboot", "false");        setSettingsLocked(userHandle);    }    /*zhanghao end*/

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