android 5.0多用户支持

较高版本的android 是支持多用户的，当然也可以修改配置使其不支持。

修改相关配置

一. 涉及到的文件：

./framework/base/core/java/android/os/UserManager.java
./framework/base/core/res/res/values/config.xml
./packages/apps/Settings/src/com/android/settings/SettingsActivity.java

二.修改主要点

1. 在mk添加属性 fw.show_multiuserui= true

2. 修改UserManager.java

    /**     * Returns whether the system supports multiple users.     * @return true if multiple users can be created by user, false if it is a single user device.     * @hide     */    public static boolean supportsMultipleUsers() {        return getMaxSupportedUsers() > 1                && SystemProperties.getBoolean("fw.show_multiuserui",                Resources.getSystem().getBoolean(R.bool.config_enableMultiUserUI));    }

3.修改SettingsActivity.java

 else if (id == R.id.user_settings) {                    boolean hasMultipleUsers =                            ((UserManager) getSystemService(Context.USER_SERVICE))                                    .getUserCount() > 1;                    if (!UserHandle.MU_ENABLED                            || (!UserManager.supportsMultipleUsers()                                    && !hasMultipleUsers)                            || Utils.isMonkeyRunning()) {                        removeTile = true;                    }                }

4.修改config.xml

config_multiuserMaximumUsers > 1以及config_enableMultiUserUI 为true

    <!--  Maximum number of supported users -->    <integer name="config_multiuserMaximumUsers">8</integer>    <!-- Whether UI for multi user should be shown -->    <bool name="config_enableMultiUserUI">false</bool>

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