android - 如何使用 Kotlin 在 android 中的 editText 上设置文本、焦点、错误

Question

我在 Internet 上大量搜索关于如何在 editText(s) in android with Kotlin(我知道我们可以在 java 中使用上述方法)但我无法找到适合我的确切解决方案。

我正在使用1.) Volley 调用 http2.) kotlin plugin for android studio with version = '1.1.3-2'3.) anko 库

Problems that i am facing when app is running : 1.)The setError() method is not getting called. 2.)i am not able to use setText() and setFocus() on editText.

请注意，我需要 Kotlin 而非 Java 中的解决方案。

提前致谢!

private fun askAppointment() {

    if (editTextPersonName?.text.isNullOrEmpty()) {
        editTextPersonName?.error ="Person Name cannot be empty."
        return
    } else if (editTextPersonMobile?.text.isNullOrEmpty()) {
        editTextPersonMobile?.error = "Person Mobile cannot be empty."
        return
    } else if (editTextPersonEmail?.text.isNullOrEmpty()) {
        editTextPersonEmail?.error = "Person Email cannot be empty."
        return
    } else if (editTextSubject?.text.isNullOrEmpty()) {
        editTextSubject?.error = "Subject cannot be empty."
        return
    } else if (editTextDescription?.text.isNullOrEmpty()) {
        editTextDescription?.error = "Description cannot be empty."
        return
    } else if (editTextAppointmentDate?.text.isNullOrEmpty()) {
        editTextAppointmentDate?.error = "Appointment Date cannot be empty."
        return
    } else if (editTextAppointmentTime?.text.isNullOrEmpty()) {
        editTextAppointmentTime?.error = "Appointment Time cannot be empty."
        return
    }

Answer 1

这很简单。让我们假设 etEmail 是 EditText。你可以这样设置文本

etEmail?.setText("some text")

对于错误你可以使用这个

etEmail?.error = "This is error"

对于定焦，你可以试试这个，但我不确定。

etEmail?.isFocusable = false

希望对您有所帮助。

检查上面代码的工作截图。

在 askAppointment() 中使用此逻辑

private fun askAppointment() {

    if (editTextPersonName?.text.isNullOrEmpty()) {
        editTextPersonName?.error = "Person Name cannot be empty."
        return
    } else if (editTextPersonMobile?.text.isNullOrEmpty()) {
        editTextPersonMobile?.error = "Person Mobile cannot be empty."
        return
    } else if (editTextPersonEmail?.text.isNullOrEmpty()) {
        editTextPersonEmail?.error = "Person Email cannot be empty."
        return
    } else if (editTextSubject?.text.isNullOrEmpty()) {
        editTextSubject?.error = "Subject cannot be empty."
        return
    } else if (editTextDescription?.text.isNullOrEmpty()) {
        editTextDescription?.error = "Description cannot be empty."
        return
    } else if (editTextAppointmentDate?.text.isNullOrEmpty()) {
        editTextAppointmentDate?.error = "Appointment Date cannot be empty."
        return
    } else if (editTextAppointmentTime?.text.isNullOrEmpty()) {
        editTextAppointmentTime?.error = "Appointment Time cannot be empty."
        return
    } else {
        //creating volley string request
        val stringRequest = object : StringRequest(Request.Method.POST, URL,
                Response.Listener<String> { response ->
                    try {
                        val jsonObject = JSONObject(response)
                        val feedback = jsonObject.getString("response")
                        toast("$feedback")
                        //finish()       //finish Activity after sending request
                    } catch (e: JSONException) {
                        e.printStackTrace()
                    }
                },
                object : Response.ErrorListener {
                    override fun onErrorResponse(volleyError: VolleyError) {
                        toast("error :(")
                    }
                }) {
            @Throws(AuthFailureError::class)
            override fun getParams(): Map<String, String> {
                val params = HashMap<String, String>()
                params.put("personName", editTextPersonName?.text.toString())
                params.put("personMobile", editTextPersonMobile?.text.toString())
                params.put("personEmail", editTextPersonEmail?.text.toString())
                params.put("subject", editTextSubject?.text.toString())
                params.put("description", editTextDescription?.text.toString())
                params.put("appointMentDate", editTextAppointmentDate?.text.toString())
                params.put("appointMentTime", editTextAppointmentTime?.text.toString())
                return params
            }
        }

        //adding request to queue
        AppController.instance?.addToRequestQueue(stringRequest)
    }
}