如何解决在 Android Studio 中使用 Integer.parseInt() 函数时出错
public void clickFunction(View view)
{
Log.i("Info","Button Pressed");
EditText e1=(EditText)findViewById(editText);
Number myNumber= new Number();
String NumberEnteredStr = e1.getText().toString();
Log.i("Number Entered",NumberEnteredStr);
myNumber.num = Integer.parseInt(NumberEnteredStr);//line 22
}
我一点一点地正确输入了整个代码,直到 应用程序崩溃,而我在 第 1 行输入了代码。 22。 转换为 int 似乎存在一些问题。请帮帮我。
PS- 我尝试删除代码的不同部分进行调试,但问题出在剩余部分的某处,可能是 clickFunction (onClick) 方法。
我的错误信息是:
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409)
at android.view.View.performClick(View.java:6294)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
at android.view.View$PerformClick.run(View.java:24770)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.Integer.parseInt(Integer.java:620)
at java.lang.Integer.parseInt(Integer.java:643)
at com.example.numbershapes.MainActivity.clickFunction(MainActivity.java:22)
我正在放下我的整个代码以供参考:
package com.example.numbershapes;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
import static com.example.numbershapes.R.id.editText;
public class MainActivity extends AppCompatActivity
{
class Number
{
int num;
}
public void clickFunction(View view)
{
Log.i("Info",NumberEnteredStr);
myNumber.num = Integer.parseInt(NumberEnteredStr);//line 22
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
解决方法
正如您在堆栈跟踪中看到的:
对于输入字符串:""
输入字段的值为空Option Explicit
Dim OutApp As Object
Dim OutNs As Object
Dim OutFolder As Object
Dim OutItems As Object
Const olFolderContacts As Integer = 10
Sub Sample()
Set OutApp = CreateObject("Outlook.Application")
Set OutNs = OutApp.GetNameSpace("MAPI")
Set OutFolder = OutNs.GetDefaultFolder(olFolderContacts)
Set OutItems = OutFolder.items
Dim EmailToFind As String
'~~> Change email here
EmailToFind = "Sid@Sid.Com"
MsgBox DoesContactExists(EmailToFind)
End Sub
'~~> Function to check if the email exists
Private Function DoesContactExists(EmailAddress As String) As Boolean
Dim olContact As Object
On Error Resume Next
Set olContact = OutItems.Find("[Email1Address] = '" & name & "'")
On Error GoTo 0
If Not olContact Is Nothing Then DoesContactExists = True
End Function
string
字符串不是数字。所以你必须检查该字段是否不为空:
empty
顺便说一句:注意java命名约定。变量名应以小写字符开头。
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