Develop Reference

Is it possible to programmatically lock the screen in Lollipop

I am building an app that will be in kiosk mode and must be over the lock screen its is possible using:
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
However, I now need to programmatically lock the screen when the app is starting, looking at this link, I see it needs administrator privileges that are a bit more complicated on the lollipop version, has anyone managed that?

For your need, you can use the Screen Pinning. It's a new functionnality added in Android 5 to limit the application a task.
Programmatically, you can use Activity.startLockTask() and Activity.stopLockTask() to pin/unpin the application.
Some things to know :
If your application is not an Admin app, a popup will appear and you'll have to manually confirm the pinning mode.
No notifications will be shown in this mode.
The Home and Recent Apps buttons will have no effects.
you can unpin the application with no confirmation, and if you have set a Keyguard screen, you'll need to unlock it to go back to your Home application.

FLAG_KEEP_SCREEN_ON does not work during keygaurd lock

Hi I am an Android newbie, I want to create an app which stays displayed even if the power button is pressed, I used,
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
but I had to press power button again to display the app, someone suggested me to use,
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
but it doesn't seem to work. Is there any work around ?

You can't prevent hardware keys overriding. Power button works on hardware level. Ur app will be unable to turn screen on after it was turned off by hardware.

Restrict Android Safe Mode on power button press

I'm in need to stop entering safe mode on my nexus 7 tablet, because I implemented an Kiosk based application simply overriding home screen. Once default home screen changed to my custom home screen, user not allowed to take reboot device for safe mode. Is there any possibility to implement these feature without changing firmware OS.
Thanks in advance!

How to prevent an Android application from locking?

I am currently making an Android application in which I need the phone to not lock, so as to avoid the activity losing focus.
I have done a bit of research and found numerous ways to do it including the use of:
Keyguard Manager
Power Manager
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
android:keepScreenOn="true"
I tried using the android:keepScreenOn="true" in my Android manifest, but it seemed to have no effect on the application. I am hesitant to using power manager as every post about it is filled with numerous warnings.
In closing, what is the best way to prevent the Android phone from locking and losing focus of the application? The screen itself may dim or turn off, so long as the application remains in focus and the phone doesn't lock.

What you want can easily achieved by using the PowerManager with a Screen Dim Wake Lock.
Also, IIRC, keepScreenOn is supposed to be added to a widget in an XML file, not in the manifest, if you do decide to use that in the end.

Prevent screen lock on dimming/standby while using android app?

I'm developing an application and the last touch I need to put on it is preventing the screen to lock when the device goes into standby (screen off). The exact behavior as Google Navigation.
I'm wondering what, programatically I will have to use to keep this feature enable the entire time while using the app?

writing the following code to your xml file will prevent the screen from locking
android:keepScreenOn="true"

In the onCreate of your activity after the setContentView use this:
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
Not tried it myself.