关于 DeviceOwner 介绍可参考下面

Android DeviceOwner 应用的能力

Android Device Administration 应用的能力

开整

接下来我们自己写一个 MDM apk，打开 AS 新建一个工程，就叫 DeviceOwnerDemo,包名 cn.test.deviceownerdemo

1、写一个类继承 DeviceAdminReceiver，空实现就行

public class TestDeviceAdminReceiver extends DeviceAdminReceiver {
    @Override
    public void onReceive(@NonNull Context context, @NonNull Intent intent) {
        super.onReceive(context, intent);
        String action = intent.getAction();
        Log.e("TestDeviceAdminReceiver","action="+action);
        //action=android.app.action.DEVICE_ADMIN_ENABLED
    }
}

2、在 AndroidManifest.xml 中配置 DeviceAdminReceiver，固定写法直接 copy

<receiver
	android:name=".TestDeviceAdminReceiver"
	android:permission="android.permission.BIND_DEVICE_ADMIN">

	<intent-filter>
		<action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
		<action android:name="android.app.action.PROFILE_PROVISIONING_COMPLETE" />
	</intent-filter>

	<meta-data
		android:name="android.app.device_admin"
		android:resource="@xml/device_admin" />
</receiver>

3、新增 device_admin.xml 配置 DeviceAdminReceiver 支持功能

<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-policies>
        <watch-login />
        <reset-password />
        <force-lock />
        <wipe-data />
        <encrypted-storage />
        <disable-camera />
        <limit-password />
        <expire-password />
        <disable-keyguard-features />
    </uses-policies>
</device-admin>

这样一个最简单的 MDM 应用就完成了，接下来就需要激活权限

DeviceAdmin 权限

通过 app 申请，先手动授权

		DevicePolicyManager mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
        ComponentName testDeviceAdmin = new ComponentName(this, TestDeviceAdminReceiver.class);
        boolean adminActive = mDPM.isAdminActive(testDeviceAdmin);
        if (!adminActive){
            Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, testDeviceAdmin);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "");
            startActivityForResult(intent, REQUEST_ACTIVATE);
        }

DeviceOwner 权限，通过 adb 设置

adb shell dpm set-device-owner cn.test.deviceownerdemo/.TestDeviceAdminReceiver

4、接下来就可通过刚刚 mDPM 操作设备配置，比如禁用系统状态栏

	DevicePolicyManager mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
    ComponentName testDeviceAdmin = new ComponentName(this, TestDeviceAdminReceiver.class);
	if(mDPM.isAdminActive(testDeviceAdmin)){
		mDPM.setStatusBarDisabled(testDeviceAdmin, false);
	}

使用上搞清楚了，接下来我们就来修改源码了，一般 MDM apk 都是客户提供的，都需要预装到系统中且默认授权

实际上重要的就两个 xml 文件 device_owner_2.xml device_policies.xml

当你手动授权成功后，在设备 /data/system/ 目录下就有这两文件，所以我们可以将两个 xml 预制到系统中

data 分区下预制文件，开机会无法启动，所以我们曲线救国，先将文件放到 system 下，系统起来后在 init.rc 执行 copy

注意 xml 文件中的 package 和 name 对应你实际的 MDM 包名

system/extras/su/device_owner_2.xml

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<root>
<device-owner package="cn.test.deviceownerdemo" name="" component="cn.test.deviceownerdemo/cn.test.deviceownerdemo.TestDeviceAdminReceiver" userRestrictionsMigrated="true" canAccessDeviceIds="true" />
<device-owner-context userId="0" />
</root>

system/extras/su/device_policies.xml

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<policies setup-complete="true" provisioning-state="3">
<admin name="cn.test.deviceownerdemo/cn.test.deviceownerdemo.TestDeviceAdminReceiver">
<policies flags="991" />
<strong-auth-unlock-timeout value="0" />
<test-only-admin value="true" />
<user-restrictions no_add_managed_profile="true" />
<default-enabled-user-restrictions>
<restriction value="no_add_managed_profile" />
</default-enabled-user-restrictions>
<cross-profile-calendar-packages />
</admin>
<lock-task-features value="16" />
</policies>

device/mediateksample/k67v1_64_bsp/device.mk

PRODUCT_COPY_FILES += \
        system/extras/su/device_policies.xml:system/device_policies.xml \
        system/extras/su/device_owner_2.xml:system/device_owner_2.xml

system/core/rootdir/init.rc

 
    copy /system/device_policies.xml /data/system/device_policies.xml 
    chmod 0600 /data/system/device_policies.xml
    chown system system /data/system/device_policies.xml
    copy /system/device_owner_2.xml /data/system/device_owner_2.xml 
    chmod 0600 /data/system/device_owner_2.xml
    chown system system /data/system/device_owner_2.xml