CODEWITHSUNDEEP
android
Balaji.K
Balaji.K

Reputation: 4829

Handling display rotation in Android

I am new the Android. In my application development, I want to handle the display (screen) rotation. Is there any listener is available to handle this event? Or is there any alternate way to handle this situation?

Thanks & Regards,

Bala

Upvotes: 7

Views: 14951

Answers (3)

Aleksandrs Voznarskis
Aleksandrs Voznarskis

Reputation: 1

Create class "ScreenOrientationListener":

class ScreenOrientationListener @Inject constructor(@ApplicationContext private val appContext: Context) :
MutableLiveData<Boolean>() {

private var screenWasRotated: Boolean = false

private var screenRotationListener: OrientationEventListener? = null

private fun registerScreenRotationListener() {
    //reset
    screenWasRotated = false

    screenRotationListener = object :
        OrientationEventListener(appContext, SensorManager.SENSOR_DELAY_NORMAL) {
        override fun onOrientationChanged(p0: Int) {
            if (!screenWasRotated) {
                if ((appContext.resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT && p0 in 90..290) ||
                    (appContext.resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE && p0 in 0..70)
                ) {
                    screenWasRotated = true
                    screenRotationListener?.disable()
                    postValue(screenWasRotated)
                }
            }
        }
    }

    if (screenRotationListener?.canDetectOrientation() == true) {
        screenRotationListener?.enable()
    } else {
        screenRotationListener?.disable()
    }
}

override fun onActive() {
    super.onActive()
    registerScreenRotationListener()
}

override fun onInactive() {
    screenRotationListener?.disable()
    screenRotationListener = null

    super.onInactive()
}

override fun getValue() = screenWasRotated 
}

I usage Dagger to initialize it in view model:

    @ExperimentalCoroutinesApi
    @HiltViewModel
    open class MyViewModel

    @Inject
    constructor(
       val screenOrientationListener: ScreenOrientationListener
    ) : ViewModel() {}

But you can just initialize it by:

val screenOrientationListener = ScreenOrientationListener(this)

How to use it:

screenOrientationListener.observe(this, {
        if(it){
           //Do something if screen was rotated
        }
})

Upvotes: 0

electrobabe
electrobabe

Reputation: 1647

When developing for API level 13 or higher (as declared by the minSdkVersion and targetSdkVersion attributes), include "screenSize" in addition to "orientation". 

android:configChanges="orientation|screenSize"

Upvotes: 3

SteD
SteD

Reputation: 14027

Let's say you want to handle the orientation change yourself, use configChanges="orientation" in your activity in the manifest.xml

<activity android:name=".MyActivity"
          android:configChanges="orientation"
          android:label="@string/app_name">

Now when one of these configurations change, MyActivity is not restarted. Instead, the Activity receives a call to onConfigurationChanged().

More details here: Handling runtime changes

Upvotes: 10

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