引起键盘关闭时界面卡顿，需在AndroidManifest.xml的<activity>中添加android:windowSoftInputMode="adjustNothing"

AndroidManifest.xml

android:windowSoftInputMode="adjustNothing"

打开软键盘

    /**
     * 获得焦点并弹出键盘
     */
    fun showSoftInputFromWindow(editText: EditText) {
        editText.isFocusableInTouchMode = true
        editText.requestFocus()
        val inputManager = editText.context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager?
        inputManager?.showSoftInput(editText, 0)
    }

关闭软键盘

    /**
     * 关闭软键盘
     */
    fun closeSoftInput(){
        val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager?
        imm?.hideSoftInputFromWindow(view?.windowToken,0)  //界面跳转，关闭键盘
    }