Android10设置ProfileOwner失败的源码解析

ProfileOwner的设置可以通过反射DevicePolicyManager中的方法，直接将当前或者指定的用户下的程序设置为ProfileOwner。
但是Android9都是有效的，到Android10却不生效了，报错信息为：

IllegalStateException: Unable to set non-default profile owner post-setup ...

为什么会报这个错误呢，来看看源码中什么情况会报这个错误。

DevicePolicyManager中有两个方法都可以设置ProfileOwner，分别是setProfileOwner、setActiveProfileOwner。
setProfileOwner可以将DeviceAdmin设置为ProfileOwner。
setActiveProfileOwner可以将普通用户设置为ProfileOwner。

分别来看看两个方法的源码：
setProfileOwner：

public boolean setProfileOwner(@NonNull ComponentName admin, @Deprecated String ownerName,
        int userHandle) throws IllegalArgumentException {
    if (mService != null) {
        try {
            if (ownerName == null) {
                ownerName = "";
            }
            return mService.setProfileOwner(admin, ownerName, userHandle);
        } catch (RemoteException re) {
            throw re.rethrowFromSystemServer();
        }
    }
    return false;
}

可以看到直接使用了mService.setProfileOwner(admin, ownerName, userHandle)进行设置，其中userHandle是由方法传入的，所以可以设置指定的用户设置为ProfileOwner。

setActiveProfileOwner：

public boolean setActiveProfileOwner(@NonNull ComponentName admin, @Deprecated String ownerName)
        throws IllegalArgumentException {
    throwIfParentInstance("setActiveProfileOwner");
    if (mService != null) {
        try {
            final int myUserId = myUserId();
            mService.setActiveAdmin(admin, false, myUserId);
            return mService.setProfileOwner(admin, ownerName, myUserId);
        } catch (RemoteException re) {
            throw re.rethrowFromSystemServer();
        }
    }
    return false;
}

这是一个打有@Deprecated的方法，是废弃的，主要做了三件事，第一件事是获取当前用户id，第二件事是将当前用户设置为DeviceAdmin，第三件事是将当前用户设置为ProfileOwner，同样设置ProfileOwner的方法是mService.setProfileOwner(admin, ownerName, myUserId)。

两种方式都是使用mService的setProfileOwner方法，接下来看看setProfileOwner方法的实现。
setProfileOwner具体实现是在DevicePolicyManagerService.java中，这是frameworks层代码，可以去源码网站查看。

@Override
public boolean setProfileOwner(ComponentName who, String ownerName, int userHandle) {
    if (!mHasFeature) {
        return false;
    }
    if (who == null
            || !isPackageInstalledForUser(who.getPackageName(), userHandle)) {
        throw new IllegalArgumentException("Component " + who
                + " not installed for userId:" + userHandle);
    }

    final boolean hasIncompatibleAccountsOrNonAdb =
            hasIncompatibleAccountsOrNonAdbNoLock(userHandle, who);
    synchronized (getLockObject()) {
        enforceCanSetProfileOwnerLocked(who, userHandle, hasIncompatibleAccountsOrNonAdb);
    
    ...
}

到目前为止，Android9与Android10差别不大，在setProfileOwner方法中，会先进入到enforceCanSetProfileOwnerLocked方法，而引起Android10报错的代码就在这个方法中。

来看看Android9中enforceCanSetProfileOwnerLocked代码的实现：

private void enforceCanSetProfileOwnerLocked(@Nullable ComponentName owner, int userHandle,
        boolean hasIncompatibleAccountsOrNonAdb) {
    UserInfo info = getUserInfo(userHandle);
    if (info == null) {
        // User doesn't exist.
        throw new IllegalArgumentException(
                "Attempted to set profile owner for invalid userId: " + userHandle);
    }
    if (info.isGuest()) {
        throw new IllegalStateException("Cannot set a profile owner on a guest");
    }
    if (mOwners.hasProfileOwner(userHandle)) {
        throw new IllegalStateException("Trying to set the profile owner, but profile owner "
                + "is already set.");
    }
    if (mOwners.hasDeviceOwner() && mOwners.getDeviceOwnerUserId() == userHandle) {
        throw new IllegalStateException("Trying to set the profile owner, but the user "
                + "already has a device owner.");
    }
    if (isAdb()) {
        if ((mIsWatch || hasUserSetupCompleted(userHandle))
                && hasIncompatibleAccountsOrNonAdb) {
            throw new IllegalStateException("Not allowed to set the profile owner because "
                    + "there are already some accounts on the profile");
        }
        return;
    }
    enforceCanManageProfileAndDeviceOwners();
    if ((mIsWatch || hasUserSetupCompleted(userHandle)) && !isCallerWithSystemUid()) {
        throw new IllegalStateException("Cannot set the profile owner on a user which is "
                + "already set-up");
    }
}

Android10中enforceCanSetProfileOwnerLocked代码的实现：

private void enforceCanSetProfileOwnerLocked(@Nullable ComponentName owner, int userHandle,
        boolean hasIncompatibleAccountsOrNonAdb) {
    UserInfo info = getUserInfo(userHandle);
    if (info == null) {
        // User doesn't exist.
        throw new IllegalArgumentException(
                "Attempted to set profile owner for invalid userId: " + userHandle);
    }
    if (info.isGuest()) {
        throw new IllegalStateException("Cannot set a profile owner on a guest");
    }
    if (mOwners.hasProfileOwner(userHandle)) {
        throw new IllegalStateException("Trying to set the profile owner, but profile owner "
                + "is already set.");
    }
    if (mOwners.hasDeviceOwner() && mOwners.getDeviceOwnerUserId() == userHandle) {
        throw new IllegalStateException("Trying to set the profile owner, but the user "
                + "already has a device owner.");
    }
    if (isAdb()) {
        if ((mIsWatch || hasUserSetupCompleted(userHandle))
                && hasIncompatibleAccountsOrNonAdb) {
            throw new IllegalStateException("Not allowed to set the profile owner because "
                    + "there are already some accounts on the profile");
        }
        return;
    }
    enforceCanManageProfileAndDeviceOwners();

    if ((mIsWatch || hasUserSetupCompleted(userHandle))) {
        if (!isCallerWithSystemUid()) {
            throw new IllegalStateException("Cannot set the profile owner on a user which is "
                    + "already set-up");
        }

        if (!mIsWatch) {
            // Only the default supervision profile owner can be set as profile owner after SUW
            final String supervisor = mContext.getResources().getString(
                    com.android.internal.R.string
                            .config_defaultSupervisionProfileOwnerComponent);
            if (supervisor == null) {
                throw new IllegalStateException("Unable to set profile owner post-setup, no"
                        + "default supervisor profile owner defined");
            }

            final ComponentName supervisorComponent = ComponentName.unflattenFromString(
                    supervisor);
            if (!owner.equals(supervisorComponent)) {
                throw new IllegalStateException("Unable to set non-default profile owner"
                        + " post-setup " + owner);
            }
        }
    }
}

通过Android9与10的比较可以看处从enforceCanManageProfileAndDeviceOwners()方法以上都是一样的，不一样出在这个方法的下面，并且可以看到Unable to set non-default profile owner post-setup错误是由哪里报出来的。

Android9与10不同的一段就是Android10会多出来一个判断：

if (!mIsWatch) {
    // Only the default supervision profile owner can be set as profile owner after SUW
    final String supervisor = mContext.getResources().getString(
                    com.android.internal.R.string
                            .config_defaultSupervisionProfileOwnerComponent);
    if (supervisor == null) {
        throw new IllegalStateException("Unable to set profile owner post-setup, no"
                        + "default supervisor profile owner defined");
    }

    final ComponentName supervisorComponent = ComponentName.unflattenFromString(
                    supervisor);
    if (!owner.equals(supervisorComponent)) {
        throw new IllegalStateException("Unable to set non-default profile owner"
                        + " post-setup " + owner);
    }
}

首先mIsWatch是判断是否是穿戴手表类型的设备，是穿戴手表为true，反之为false，那么不是穿戴手表类型的设备会进入到下面的判断。
然后获取config_defaultSupervisionProfileOwnerComponent的String内容，这个String是系统的，获取出来后，会使用这个String生成ComponentName。
ComponentName中unflattenFromString方法：

public static @Nullable ComponentName unflattenFromString(@NonNull String str) {
    int sep = str.indexOf('/');
    if (sep < 0 || (sep+1) >= str.length()) {
        return null;
    }
    String pkg = str.substring(0, sep);
    String cls = str.substring(sep+1);
    if (cls.length() > 0 && cls.charAt(0) == '.') {
        cls = pkg + cls;
    }
    return new ComponentName(pkg, cls);
}

根据上面的代码可以推测出config_defaultSupervisionProfileOwnerComponent的内容应该为: com.xxx.xxx/com.xxx.xxx.classname或者com.xxx.xxx/.classname

最后会让两个ComponentName进行比较，ComponentName中equals方法：

@Override
public boolean equals(Object obj) {
    try {
        if (obj != null) {
            ComponentName other = (ComponentName)obj;
            // Note: no null checks, because mPackage and mClass can
            // never be null.
            return mPackage.equals(other.mPackage)
                    && mClass.equals(other.mClass);
        }
    } catch (ClassCastException e) {
    }
    return false;
}

上面的代码就是将ComponentName的package与class与另外一个进行比较，比较不相同就会报Unable to set non-default profile owner post-setup错误。

根据上面的分析，获取到的config_defaultSupervisionProfileOwnerComponent的内容不是您想要设置的包以及包中的类，所以会报错。

怎么让config_defaultSupervisionProfileOwnerComponent这个值是您想要的值呢，目前是对系统进行修改，没有找到其他的方法，经系统修改值之后，Android10可以顺利的设置ProfileOwner。

本文地址：https://blog.csdn.net/qq_33208587/article/details/114320353