Styjun

I'm trying to enable the device administration, so I can create secondary users in Android 9.

First is to send an intent with ACTION_ADD_DEVICE_ADMIN like this below :

 // Launch the activity to have the user enable our admin.
 Intent deviceAdminIntent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
 deviceAdminIntent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mDeviceAdminRen);
 deviceAdminIntent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
 getResources().getString(R.string.device_admin_activation_message));

 startActivityForResult(deviceAdminIntent, REQ_ENABLE_DEVICE_ADMIN);

A deviceAdminReceiver must be prior defined in the manifest.xml with the proper intent filter:

 <activity android:name=".AuthSessionActivity" />
 <activity android:name=".CreateRenUser"/>
 <receiver android:name=".DeviceAdminRen"
 android:label="@string/renault_device_admin"
 android:description="@string/ren_device_admin_description"
 android:permission="android.permission.BIND_DEVICE_ADMIN">
 <meta-data android:name="android.app.device_admin"
 android:resource="@xml/device_admin_ren" />
 <intent-filter>
 <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
 </intent-filter>
 </receiver>

Also the deviceAdminReceiver class is defined :

public class DeviceAdminRen extends DeviceAdminReceiver {

.........

But then I'm getting the error :

03-28 16:44:54.573 7173 7173 E AndroidRuntime: java.lang.RuntimeException: Unable to resume activity com.sensory.trulysecureexample/com.sensory.trulysecure.custom.CreateRenaultUser: android.content.ActivityNotFoundException: No Activity found to handle Intent act=android.app.action.ADD_DEVICE_ADMIN (has extras)
03-28 16:44:54.573 7173 7173 E AndroidRuntime: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3822)
03-28 16:44:54.573 7173 7173 E AndroidRuntime: at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3854)
03-28 16:44:54.573 7173 7173 E AndroidRuntime: at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityIte

My Android application has several activities and fragments but if I understand well, this should be an Android system activity. Also my device has "feature:android.software.device_admin" when listing with "adb shell pm list features"
Is there any limitation in my device preventing to handle the ACTION_ADD_DEVICE_ADMIN intent ??

Note: I followed this Google Android guide https://developer.android.com/guide/topics/admin/device-admin.html

Thanks

What is the content of the constant / variable mDeviceAdminRen? That seems to be missing from your code snippet.

It should contain the component name of the device admin component, so in your case DeviceAdminRen.getComponentName(Context context).

Is this the case?

As I'm building my application with the Android NDK, I added the LOCAL_PRIVILEGED_MODULE build directive in the Makefile of the C++ lib.
gnu-libstdc++/Android.mk:LOCAL_PRIVILEGED_MODULE := true

And it worked !! There is a prompt in Android asking for enabling device administration, and then it becomes easy to create secondary users.