Question

I build a simple application to test the sleep option of the android mobile

I put this code inside the button:

Intent lockscreen=new Intent();
lockscreen.setAction(Intent.ACTION_SCREEN_OFF);
startActivity(lockscreen);

with no change ,
also I put the permission…I want when I press this button my phone would locked (not locked by password) (normal lock)
Any Help.

Answer 1

First, ACTION_SCREEN_OFF is a broadcast Intent, not one used with startActivity().

Second, as the documentation for ACTION_SCREEN_OFF states, “This is a protected intent that can only be sent by the system”.

I want when I press this button my phone would locked (not locked by password) (normal lock)

You are welcome to use the device admin APIs and use lockNow() on DevicePolicyManager, which should achieve this effect.