Android How to adjust layout in Full Screen Mode when softkeyboard is visible

Question

I have researched a lot to adjust the layout when softkeyboard is active and I have successfully implemented it but the problem comes when I use android:theme=\"@andro

Answer 1

I tried the solution from Joseph Johnson, but like others I ran into the gap-between-content-and-keyboard problem. The problem occurs because the soft input mode is always pan when using full-screen mode. This panning interferes with Joseph's solution when you activate an input field that would be hidden by the soft input.

When the soft input appears, the content is first panned based on its original height, and then resized by the layout requested by the Joseph's solution. The resizing and subsequent layout do not undo the panning, which results in the gap. The full order of events is:

1. Global layout listener
2. Panning
3. Layout of content (= actual resizing of content)

It is not possible to disable panning, but it is possible to force the pan offset to be 0 by changing the height of the content. This can be done in the listener, because it is run before panning takes place. Setting the content height to the available height results in a smooth user experience, i.e. no flickering.

I also made these changes. If any of these introduce issues, let me know:

• Switched determination of available height to use getWindowVisibleDisplayFrame. The Rect is cached to prevent a little bit of unneeded garbage.
• Allow the listener to be removed too. This is useful when you reuse an activity for different fragments having different full-screen requirements.
• Do not distinguish between keyboard shown or hidden, but always set the content height to the visible display frame height.

It has been tested on a Nexus 5, and emulators running API levels 16-24 with screen sizes ranging from tiny to big.

The code has been ported to Kotlin, but porting my changes back to Java is simple. Let me know if you need help:

class AndroidBug5497Workaround constructor(activity: Activity) {
    private val contentContainer = activity.findViewById(android.R.id.content) as ViewGroup
    private val rootView = contentContainer.getChildAt(0)
    private val rootViewLayout = rootView.layoutParams as FrameLayout.LayoutParams
    private val viewTreeObserver = rootView.viewTreeObserver
    private val listener = ViewTreeObserver.OnGlobalLayoutListener { possiblyResizeChildOfContent() }

    private val contentAreaOfWindowBounds = Rect()
    private var usableHeightPrevious = 0

    // I call this in "onResume()" of my fragment
    fun addListener() {
        viewTreeObserver.addOnGlobalLayoutListener(listener)
    }

    // I call this in "onPause()" of my fragment
    fun removeListener() {
        viewTreeObserver.removeOnGlobalLayoutListener(listener)
    }

    private fun possiblyResizeChildOfContent() {
        contentContainer.getWindowVisibleDisplayFrame(contentAreaOfWindowBounds)
        val usableHeightNow = contentAreaOfWindowBounds.height()
        if (usableHeightNow != usableHeightPrevious) {
            rootViewLayout.height = usableHeightNow
            // Change the bounds of the root view to prevent gap between keyboard and content, and top of content positioned above top screen edge.
            rootView.layout(contentAreaOfWindowBounds.left, contentAreaOfWindowBounds.top, contentAreaOfWindowBounds.right, contentAreaOfWindowBounds.bottom)
            rootView.requestLayout()

            usableHeightPrevious = usableHeightNow
        }
    }
}