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Android: Device Administrator: Launch Device Admin From Service

I cannot get an action that allows the user to grant permission to use the application to administer the device.

My code is as follows:

ComponentName comp = new ComponentName(this, CustomReceiver.class);

Intent i = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

i.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, comp);
i.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "Explanation");

startActivity(i);

The application does not crash / report an exception. What can i do wrong?

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2 answers

Something like this would do

if (!mPolicy.isAdminActive()) {

    Intent activateDeviceAdminIntent =
        new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

    activateDeviceAdminIntent.putExtra(
        DevicePolicyManager.EXTRA_DEVICE_ADMIN,
        mPolicy.getPolicyAdmin());

    // It is good practice to include the optional explanation text to
    // explain to user why the application is requesting to be a device
    // administrator. The system will display this message on the activation
    // screen.
    activateDeviceAdminIntent.putExtra(
        DevicePolicyManager.EXTRA_ADD_EXPLANATION,
        getResources().getString(R.string.device_admin_activation_message));

    startActivityForResult(activateDeviceAdminIntent,
        REQ_ACTIVATE_DEVICE_ADMIN);
}

Maybe you are not considering

mPolicy.getPolicyAdmin()
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Here is a clear example of how to do this (white papers here and here skip some context)

//class that implements DeviceAdminReceiver, defined in the Manifest 
ComponentName deviceAdminCN = new ComponentName(context, DeviceAdminReceiverImpl.class) 

...

Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, deviceAdminCN);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "your explanation for the user here");
startActivityForResult(intent, YOUR_REQUEST_CODE);

Here is the reference class used in the official sample application.

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