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react native picker - doesn't hide when android back button pressed

I have a listener on the whole app for the back button press event in android to override the default behaviour of back button(exit the app).
Also in some component i have override it too if i want the back button to be disabled or do something else.
The problem is when i open a react-native-picker, the picker stays on the screen ignoring the back button press.
I want it to first close (on the first back button press) and only then do what the higher component ordered to do when back button is pressed.
so i can't override the the higher component back button handling
i thought maybe to add the picker as a screen in the navigator and instead of planting it as a component, navigate to it, so it will be added to the stack navigator.
then by default it will first pop it of the stack when pressing back.
how can i add the picker component as a screen to navigate to, or is there a better way to do that?

By default the back behavior collapses or closes the picker on Android (depending on the mode you have chosen). You can see a working example here.

perform the same action as device back button React native

I have added back button to the app and when I click it I want to perform the same action as that of the device back button. how can I achieve that in react native.
Currently I am on Android.r
Could you share any relevant information regarding this please.
Thanks
R

Whenever a user press the back button on the device, what the app does is removing the screen at the top of the stack. In react-navigation you can use the "goBack" function to do the same.
Example:
onPressBack=()=>{
this.props.navigation.goBack();
}
source: https://reactnavigation.org/docs/en/navigation-prop.html#goback-close-the-active-screen-and-move-back

Get current screen name of drawer navigation

I'm using React Navigation for my react native app. Currently, my drawer have 5 menus. Let's assume there are Home screen, ScreenA, ScreenB, Screen,C, and ScreenD.
I want a behaviour like this
If user press back button on Android on Home Screen, the screen will show pop up
If user press back button on Android on other screen except Home Screen, the screen will navigate to Home Screen.
I also use Redux Integration and did all the setup as described in React Navigation's documentation.
Need your help guys. Thanks

How to do on Button click animation Like in Google android application back Button?

I need to know How to recreate the button animation Like the Open Navigation Drawer and back buttons on Google Apps,
Open NavMenu button rotates 360 then changes to back button in the tool bar with the fading in or out responding fragments, then if you pressed back button the same animation sequence occur reversely
You can observe it if you opened your Gmail

Maybe this library will help you.
A library to bring fully animated Material Design components to pre-Lolipop Android.
Check github sample.
or if you are looking navigation drawer samples like in google apps,
please check this tutorial .

How create fullscreen in android 4.0?

Hello,
I need do fullscreen in android 4.0 (I must hide back button, home...)
I used android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
but it doesn't work.

Homebutton and backbutton cannot be hidden...
Users always need to have access to these buttons, so the black bar will always be on the screen

Like write K_Anas in a relative question, it is not possible hide Homebutton and backbutton in Android 4.0, for security reasons and because is a simply anti-pattern solution.

You can use SYSTEM_UI_FLAG_HIDE_NAVIGATION to hide the system navigation temporarily, but it will always reappear when the user touches the screen. Even the notification bar will reappear when the screen is touched.
You are not allowed to hide the system bar with the home button completely for security reasons.