Question

我一直试图通过EditText接受两个值，1）inpval2和2）rate。我使用了Integer类和parseInt（）方法以及

android:digits="0123456789." android:inputType="number" 将接受的值转换为整数的属性。

以下是代码：

package kk.currency;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class CurrencyActivity extends Activity {
/** Called when the activity is first created. */

EditText inpval1;
EditText inpval2;
EditText rate;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
}

public void btnclick(View view)  {

        inpval1 = (EditText)findViewById(R.id.away);
        int v1 = Integer.parseInt(inpval1.getText().toString());

        inpval2 = (EditText)findViewById(R.id.home);
        int v2 = Integer.parseInt(inpval2.getText().toString());

        rate = (EditText)findViewById(R.id.rate);
        int r = Integer.parseInt(rate.getText().toString());  

        v1 = v2 * r;

    }

}

现在的问题是，当我点击按钮（onClick =＆＃34; btnclick＆＃34;）时，应用程序就会停止工作。

如果我删除

int v1 = Integer.parseInt(inpval1.getText().toString());
int v2 = Integer.parseInt(inpval2.getText().toString());
int r = Integer.parseInt(rate.getText().toString());

单击按钮后应用程序不会崩溃。

以下是logcat错误：

> 05-17 02:59:04.676: D/gralloc_goldfish(869): Emulator without GPU emulation detected.
05-17 02:59:13.907: D/AndroidRuntime(869): Shutting down VM
05-17 02:59:13.907: W/dalvikvm(869): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
05-17 02:59:13.946: E/AndroidRuntime(869): FATAL EXCEPTION: main
05-17 02:59:13.946: E/AndroidRuntime(869): java.lang.IllegalStateException: Could not execute method of the activity
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.view.View$1.onClick(View.java:3044)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.view.View.performClick(View.java:3511)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.view.View$PerformClick.run(View.java:14105)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.os.Handler.handleCallback(Handler.java:605)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.os.Handler.dispatchMessage(Handler.java:92)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.os.Looper.loop(Looper.java:137)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.app.ActivityThread.main(ActivityThread.java:4424)
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.reflect.Method.invokeNative(Native Method)
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.reflect.Method.invoke(Method.java:511)
05-17 02:59:13.946: E/AndroidRuntime(869):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-17 02:59:13.946: E/AndroidRuntime(869):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-17 02:59:13.946: E/AndroidRuntime(869):  at dalvik.system.NativeStart.main(Native Method)
05-17 02:59:13.946: E/AndroidRuntime(869): Caused by: java.lang.reflect.InvocationTargetException
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.reflect.Method.invokeNative(Native Method)
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.reflect.Method.invoke(Method.java:511)
05-17 02:59:13.946: E/AndroidRuntime(869):  at android.view.View$1.onClick(View.java:3039)
05-17 02:59:13.946: E/AndroidRuntime(869):  ... 11 more
05-17 02:59:13.946: E/AndroidRuntime(869): Caused by: java.lang.NumberFormatException: Invalid int: ""
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.Integer.invalidInt(Integer.java:138)
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.Integer.parseInt(Integer.java:359)
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.Integer.parseInt(Integer.java:332)
05-17 02:59:13.946: E/AndroidRuntime(869):  at kk.currency.CurrencyActivity.btnclick(CurrencyActivity.java:24)
05-17 02:59:13.946: E/AndroidRuntime(869):  ... 14 more

任何人都可以帮我这个吗？我是初学者，并花了很多时间来尝试寻找解决方案。

Answer 1

这是你的问题：

05-17 02:59:13.946: E/AndroidRuntime(869): Caused by: java.lang.NumberFormatException: Invalid int: "" 
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.Integer.invalidInt(Integer.java:138) 
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.Integer.parseInt(Integer.java:359) 
05-17 02:59:13.946: E/AndroidRuntime(869):  at java.lang.Integer.parseInt(Integer.java:332) 
05-17 02:59:13.946: E/AndroidRuntime(869):  at kk.currency.CurrencyActivity.btnclick(CurrencyActivity.java:24) 
05-17 02:59:13.946: E/AndroidRuntime(869):  ... 14 more

行at kk.currency.CurrencyActivity.btnclick(CurrencyActivity.java:24)告诉您，在第24行的CurrencyActivity.java文件中，由于int无效，它会抛出NumberFormatException，这是空字符串“”。这意味着您单击其中一个字段为空，并且它尝试将“”解析为整数并在失败时抛出异常。

Answer 2

您应该发布logcat错误，以便我们为您提供更多帮助。

有两件事可能导致您的崩溃：

1。）你不能将输入解析为整数（超出范围的值？正在解析的文本？十进制值？）

或

2。）你的findViewById调用返回null，当你调用inpval1.getText().toString()时，它会抛出一个NullPointerException

Answer 3

String s1 = inpval1.getText().toString();
String s2 = inpval2.getText().toString();
String s3 = rate.getText().toString();

int v1=Integer.parseInt(s1);
int v2=Integer.parseInt(s2);
int r = Integer.parseInt(s3);

无法通过EditText接受整数值

3 个答案: