Locking android device from app

Question

Please help me in how to lock the android device from an app.

DevicePolicyManager devicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);

devicePolicyManager.lockNow();

Used above code but its not working.

Answer 1

Before Lock the screen you need to Enable Admin Permission.You can check whether device admin is active or not like

deviceManger.isAdminActive(compName);

if not then you have to enable it first, and then you can lock the device using

deviceManger.lockNow();  

For further information you can refer this:

Lock Screen programmatically