小编Jam*_*ame的帖子

此代码用于 android 模拟器上的按钮。但是，当我将此代码放在主 activity.kt 中时，它给了我多个错误。我遇到的第一个错误是主活动第 9 行的重新声明错误

package com.example.android.justjava

import android.R
import android.os.Bundle
import android.support.v7.app.ActionBarActivity
import android.view.View
import android.widget.TextView

// This activity displays an order form to order coffee.
class MainActivity : ActionBarActivity() {
    protected fun onCreate(savedInstanceState: Bundle) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
    }

    // this method is called when the order button is clicked.
    fun submitOrder(view: View) {
      display(1)
    }

    // This method displays the given quantity value on the screen.
    private fun display(number: Int) {
      val quantityTextView = findViewById(R.id.quantity_text_view as …