我一直在尝试通过EditText接受两个值，1）inpval2和2）rate。我已经使用了Integer类和parseInt（）方法以及android:digits="0123456789." android:inputType="number"
属性，将接受的值转换为整数。
这是代码：
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，当我单击按钮（onClick =“ btnclick”）时，应用程序停止运行。
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());
单击该应用程序不会崩溃。
这是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
谁能帮我这个忙吗？我是一个初学者，为此花了很多时间尝试寻找解决方案。
最佳答案
这是您的问题：
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
at kk.currency.CurrencyActivity.btnclick(CurrencyActivity.java:24)行告诉您，在CurrencyActivity.java文件的第24行中，由于无效的int（空字符串“”），它引发NumberFormatException。这意味着您单击的字段为空，并且试图将“”解析为整数，并在失败时引发异常。