将 TextView 中的整数重置为 0 (Kotlin)

Reset integers in a TextView to 0 (Kotlin)

所以我可以使用递增和递减按钮,但我需要使用清除按钮将第二组重置为 0。如果你按下它,它会显示一个 0 作为字符串值,但它不会重置输出。例如,如果我要将整数值递增到 6,然后按下清除按钮,它会在 TextView 中显示 0,但是一旦我再次按下递增按钮,它会直接上升到 7 而不是 1。

我错过了什么?

KT

package com.example.plus_and_minus_input

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    increase_1.setOnClickListener { increaseInteger1() }
    decrease_1.setOnClickListener { decreaseInteger1()

    }



    increase_2.setOnClickListener { increaseInteger2() }
    decrease_2.setOnClickListener { decreaseInteger2() }

    clear_button.setOnClickListener {
        integer_number_2.text ="0"
    }


}
private var integer1 = 0
private var integer2 = 0

fun increaseInteger1() {
    //display_number_1(integer_number_1.text.toString().toInt() + 1)
    integer1 = (integer1 + 1).coerceAtMost(10)
    display_number_1(integer1)


}

fun decreaseInteger1() {
    //display_number_1(integer_number_1.text.toString().toInt() - 1)
    integer1 = (integer1 - 1).coerceAtLeast(0)
    display_number_1(integer1)



}


fun increaseInteger2() {
    //display_number_2(integer_number_2.text.toString().toInt() + 1)
    integer2 = (integer2 + 1).coerceAtMost(10)
    display_number_2(integer2)
}

fun decreaseInteger2() {
    //display_number_2(integer_number_2.text.toString().toInt() - 1)
    integer2 = (integer2 - 1).coerceAtLeast(0)
    display_number_2(integer2)
}



private fun display_number_1(number: Int) {
    integer_number_1.setText("$number")
}

private fun display_number_2(number: Int) {
    integer_number_2.setText("$number")
}

}

xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
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"
tools:context=".MainActivity">

<LinearLayout
    android:id="@+id/linearLayout"
    android:layout_width="309dp"
    android:layout_height="118dp"
    android:layout_marginTop="56dp"
    android:layout_marginBottom="549dp"
    android:orientation="horizontal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <Button
        android:id="@+id/decrease_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="-" />

    <TextView
        android:id="@+id/integer_number_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="40dp"
        android:layout_marginTop="16dp"
        android:layout_marginRight="40dp"
        android:layout_marginBottom="16dp"
        android:inputType="number"
        android:text="0"
        android:textSize="70sp"
        android:textStyle="bold" />

    <Button
        android:id="@+id/increase_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="+" />


</LinearLayout>

<Button
    android:id="@+id/decrease_2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="-"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toStartOf="@+id/integer_number_2"
    app:layout_constraintHorizontal_bias="0.513"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout"
    app:layout_constraintVertical_bias="0.317" />

<Button
    android:id="@+id/increase_2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="+"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.579"
    app:layout_constraintStart_toEndOf="@+id/integer_number_2"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout"
    app:layout_constraintVertical_bias="0.313" />

<TextView
    android:id="@+id/integer_number_2"
    android:layout_width="46dp"
    android:layout_height="99dp"
    android:layout_marginStart="46dp"
    android:layout_marginLeft="46dp"
    android:inputType="number"
    android:text="0"
    android:textSize="70sp"
    android:textStyle="bold"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.426"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/linearLayout"
    app:layout_constraintVertical_bias="0.297" />

<Button
    android:id="@+id/clear_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Clear"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/integer_number_2" />


  </androidx.constraintlayout.widget.ConstraintLayout>

您还需要重置全局 int var 的值:

clear_button.setOnClickListener {
    integer_number_2.text ="0"
    integer2 = 0
}

在 kotlin/java 中用下划线命名变量是不好的做法。使用驼峰式大小写代替 tvIntegerNumberTwo 并可能为其分配 xml 元素类型的首字母以更好地识别它是什么。