棒棒糖设备所有者应用中断电话

Question

Thanks to such so answers I was able to setup a device-owner App on my smartphone. This is a very basic test app just made to enable / disable screen pinning mode...

Anyway, at the end it works but with a very, very bad drawback : I've lost all access to the phone capabilities

• No more phone icon, except in the Settings > Applications > All
• If I call it, it's ringing on the caller side, but the phone does not react at all...
• However the status cellular icon indicates that it has 3G network.

All of those symptoms are pretty weird and leads me to wonder if my tiny device-owner app is locking something somewhere : Would anyone have any thoughts or experience about this ?

Answer 1

I found my own answer.

The key thing is to re-enable the default system applications with the DevicePolicyManager.enableSystemApp method, because for some reason when provisioning device with your NFC-triggered-device-owner-app at install time, it prevents further installation of all the default apps (at least on my Nexus 6).

So, once provisioned etc. I listed all the uninstalled apps and re-enabled them with the code below:

        DevicePolicyManager mDPM = (DevicePolicyManager) this.getSystemService(Context.DEVICE_POLICY_SERVICE);
        ComponentName mDeviceAdminRcvr = new ComponentName(this, DeviceAdminRcvr.class);

        List<PackageInfo> packs = getPackageManager().getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
        for (int i=0; i<packs.size(); i++) 
        {
            PackageInfo p = packs.get(i);
            try {
                mDPM.enableSystemApp(mDeviceAdminRcvr, p.packageName);
            } catch (Exception e) {
                // TODO: handle exception
            }
        }