当我的 textInputLayout 为空时如何出错

Question

我是用textInputLayout进行小数加法，问题是在调用isEmpty()时如果字段为空报错，这个选项没有出现

我想这样做

 button.setOnClickListener {


            val numberOne = textInputLayout.editText?.text.toString().toDouble()
            val numberTwo = textInputLayout2.editText?.text.toString().toDouble()
            val reult = numberOne + numberTwo

            if (numberOne./*no appears isEmpty*/){
              textInputLayout.error = ("enter number")
            }else
                if (numberTwo./*no appears isEmpty*/){
                    textInputLayout2.error = ("enter number")
                }else {
                    textView.text = reult.toString()
                }
            
        }

xmlns

 <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/textInputLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"
        android:hint="@string/numero"
        app:layout_constraintEnd_toEndOf="parent"
        app:errorEnabled="true"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/textInputLayout2"
        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="120dp"
        android:hint="@string/numero2"
        app:errorEnabled="true"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </com.google.android.material.textfield.TextInputLayout>

Answer 1

numberOne 和 numberTwo 是 double
val numberOne = textInputLayout.editText?.text.toString().toDouble()

isEmpty() 是一个字符串函数尝试 numberOne.toString().isEmpty() 和相同的 numberTwo

Answer 2

您可以使用类似的东西：

        <com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputEditText
                android:inputType="numberDecimal"
                .../>

您可以使用以下方法检查值：

val double: Double? = textInputLayout.editText?.text.toString().toDoubleOrNull()
val double2: Double? = textInputLayout2.editText?.text.toString().toDoubleOrNull()
    
if (double != null){
      //Double1 is a number
      textInputLayout.error = ""
      if (double2 != null){
         //Double2 is a number
          textInputLayout2.error = ""
          textview.text = (double+double2).toString()
       } else {
          //Double2 is not a number
          textInputLayout2.error = "Error"
           textview.text = ""
       }
 } else {
     //Double1 is not a number
     textInputLayout.error = "Error"
     textview.text = ""
 }

当我的 textInputLayout 为空时如何出错

How to put an error when my textInputLayout is empty

java

textinput

kotlin

android-textinputlayout