Intercept back button from soft keyboard

user_436938 0
Viewed 94195

I have the activity with several input fields. When activity started soft keyboard is shown. When back button pressed soft keyboard closes and to close activity I need to press back button one more time.

So the question: is it possible to intercept back button to close soft keyboard and finish activity in one press of back button without creating custom InputMethodService?

P.S. I know how to intercept back button in other cases: onKeyDown() or onBackPressed() but it doesn't work in this case: only second press of back button is intercepted.

android
10 Answers

my version of @mhradek solution:

Layout

class BazingaLayout @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) :
    ConstraintLayout(context, attrs, defStyleAttr) {

var activity: Activity? = null

override fun dispatchKeyEventPreIme(event: KeyEvent): Boolean {
    activity?.let {
        if (event.keyCode == KeyEvent.KEYCODE_BACK) {
            val state = keyDispatcherState
            if (state != null) {
                if (event.action == KeyEvent.ACTION_DOWN
                    && event.repeatCount == 0) {
                    state.startTracking(event, this)
                    return true
                } else if (event.action == KeyEvent.ACTION_UP && !event.isCanceled && state.isTracking(event)) {
                    it.onBackPressed()
                    return true
                }
            }
        }
    }
    return super.dispatchKeyEventPreIme(event)
}

}

xml file

<com... BazingaLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/grey">
 </com... BazingaLayout>

Fragment

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        (view as BazingaLayout).activity = activity
        super.onViewCreated(view, savedInstanceState)
}
user_98815990

Here's my variation of @kirill-rakhman's solution.

I needed to know when the hardware or gesture back button was pressed while the keyboard was showing so I could react and show a button that had previously been hidden when any of the edit text views had received focus.

  1. First declare the call back interface your require
interface KeyboardEventListener {
   fun onKeyBoardDismissedIme()
}
  1. Then create the custom view with the listener for pre ime key events
class KeyboardAwareConstraintLayout(context: Context, attrs: AttributeSet) :
    ConstraintLayout(context, attrs) {

    var listener: KeyboardEventListener? = null

    override fun dispatchKeyEventPreIme(event: KeyEvent?): Boolean {
        val imm: InputMethodManager =
            context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        if (imm.isActive && event?.keyCode == KeyEvent.KEYCODE_BACK) {
            listener?.onKeyBoardDismissedIme()
        }
        return super.dispatchKeyEventPreIme(event)
    }
}
  1. Wrap your layout with the custom layout view
<com.package_name.KeyboardAwareLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/keyBoardAwareLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

{Your layout children here}    

</com.package_name.KeyboardAwareLayout>
  1. Next implement the callback interface in your activity or fragment and set on the keyboard aware layout
class MyFragment : Fragment, KeyboardEventListener {

    // TODO: Setup some viewbinding to retrieve the view reference

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.keyBoardAwareLayout.listener = this
    }

    override fun onKeyBoardDismissedIme() {
        // TODO: React to keyboard hidden with back button
    }
}
user_8576810
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