[android] Android: show soft keyboard automatically when focus is on an EditText

Looking at https://stackoverflow.com/a/39144104/2914140 I simplified a bit:

// In onCreateView():
view.edit_text.run {
    requestFocus()
    post { showKeyboard(this) }
}

fun showKeyboard(view: View) {
    val imm = view.context.getSystemService(
        Context.INPUT_METHOD_SERVICE) as InputMethodManager?
    imm?.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT)
}

It is better than https://stackoverflow.com/a/11155404/2914140:

InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);

because when you press Home button and move to home screen, the keyboard will stay open.

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