There can be many ways to achieve transfer ownership(Device owner) from one android application to another. Transfer of ownership means transfer of one administrator to another. I am going to explain one of the simplest ways to transfer ownership in this blog.

In Device owner mode:

Once the device is factory reset and provisioned using QR-code or different technique, it downloads the application A which will provision the device from the download path given in the QR-Code.The application A will get installed on the device and it will start the provisioning process. The application A will get all the provisioning data required from the QR code as ADMIN_EXTRAS. The application A provisions the device and becomes the administrator (device owner). The application A can start downloading an apk file for application B and then install it accordingly. Once Application B is installed on the device, we can make application B as the device owner by transferring ownership using the DevicePolicyManager apis provided by android.

Define a PersistableBundle to store the admin extras received during provisioning process, for example :-

PersistableBundle lObjPersistableBundle = new PersistableBundle();
lObjPersistableBundle.putString(key, value);

lObjPersistableBundle.putString(key, value);

Now from Application A, get the instance of DevicePolicyManager

dpm.transferOwnership(new ComponentName("Application A packagename", "Application A Device Admin Receiver"),new ComponentName("Application B packagename", "Application A Device Admin Receiver"),lObjPersistableBundle);

Transfer the ownership from application A to application B using the following api,

final DevicePolicyManager dpm = (DevicePolicyManager) yourContextObject.getSystemService(Context.DEVICE_POLICY_SERVICE);

For example :-

dpm.transferOwnership(new ComponentName("com.application.a", "com.application.a.aDeviceAdmin"),new ComponentName("com.application.b", "com.application.b.bDeviceAdmin"),lObjPersistableBundle);

lObjPersistableBundle contains the admin extras needed to be transferred to application B.

This operation is atomic,either complete or not done at all. The incoming target administrator must have the <support-transfer-ownership /> tag inside the <device-admin></device-admin> tags in the xml file referenced by DeviceAdminReceiver#Device_Admin_Meta_Data. Otherwise an IllegalArgumentException  will be thrown.

If the operation of transfer of ownership was successful, the data passed during the transfer in persistable bundle will be received in DeviceAdminReceiver#onTransferOwnershipComplete(@NonNull Context context, @Nullable PersistableBundle bundle). Application B will now become the device owner. If operation was unsuccessful, then Application A will remain as device owner.