Is is possible that a toast will get displayed of my application overriding every kind of lock in the device that exist when user press the power button twice in unrooted device. I am just few months old to android.
There isn't a way to override the lock screen but there is a way to co-operate with it. Starting from Android 4.2, you can write a lock screen widget to display custom information on the lock screen.
Update:
Only Android versions lower than 5.0 support lock-screen widgets. For Android 5.0 and higher, only home_screen is valid.
Source: API Docs
Related
I want to access my apps functions directly from the lock screen but I can't, it is only showing the app icon without the ability to click it unless screen unlocked,i am using my mobile with android 9 as emulator .
is there any way to solve it,thanks
as I found from Android developer website,it is not possible after version 5 as below
"The widget Category attribute declares whether your App Widget can be displayed on the home screen (home_screen), the lock screen (key guard), or both. Only Android versions lower than 5.0 support lock-screen widgets. For Android 5.0 and higher, only home_screen is valid."
I want to force a widget to appear on the lock screen in Android.
Any ideas or code examples?
Thanks in advance.
First, the standard Android lockscreen framework only supports app widgets from Android 4.1 through 4.4, which is a steadily shrinking portion of the Android device ecosystem.
Second, there is no programmatic means, in standard Android, to force the user to add an app widget to the home screen or to the lockscreen.
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.
Are there any changes made to lock screen widgets in lollipop. Though official documents explicitly shows no changes but ,http://www.extremetech.com/computing/192112-android-5-0-lollipop-all-details-and-features-of-googles-sweetest-treat-yet says lock screen widgets are gone.
Lock screen widgets do not exist in either of the Android Developer Preview builds of Android 5.0 so they are effectively gone. However, WIDGET_CATEGORY_KEYGUARD has not yet been deprecated. Whether this is an oversight or not is anyone's guess. There does not appear to be any gesture, area, or anything else (such as anything in the Settings app) in the Android 5.0 builds so far that would indicate support for lock screen widgets.
It appears the main case for lock screen widgets is suggested to be handled by notifications, similar to how music controls have changed - the old RemoteControlClient based controls used to take up the same place as lock screen widgets but have been completely deprecated.
http://code.google.com/p/android/issues/detail?id=80428&can=1&q=widget%20lockscreen&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars
Yes, widgets are not there is lollipop lock screen . Issue has been raised with android bug tracker in the above link. If possible star this bug for speedy process.Lets hope we get it back.
Direct from Google:
I spoke directly with a Google Engineer today.
She mentioned that the feature was added in API 4.2 and removed as of API 5.0
Hope this helps!
Is there a way to change the lock screen in Android programmatically?
If yes, is it possible to create an animation within that view?
Is there a way to change the lock screen in Android programmatically?
No, because there is only one lock screen. On Android 4.2, the user can add app widgets to the lock screen, if the user chooses. You can elect to create an app widget that can be added to the lock screen.
If yes, is it possible to create an animation within that view?
Generally, no. App widgets are not normally animated.
android doesn't officially supports it with a nice API , but there are some solutions for this problem . the best one that i can think of and that will work perfectly on all devices and android versions is this :
you can make an app that functions as a launcher , and ask the user to disable the lock screen.
this way , when the screen is turned off&on , your app will be able to be shown and do whatever it needs .
each time the app is being unlocked , it will send the intent of the home button to the real launcher the user has chosen .
of course , there are other solutions , but as i've tried , all of them have some kind of problem on some android devices and versions . they work by listening to the power off intent , and block the home button by using a flaw they've found in the android source code . you can never assume that it will work on all devices and android versions .
example of such apps are "widgetLocker" and "Picture Password Lockscreen"