Question

Android Studio 3.6，java 1.8。

在我拥有的android项目中：

double newAmountIntValueAsDouble = Double.parseDouble(newAmountValueAsString);

但我收到错误消息：

12-30 09:28:50.412 E/AndroidRuntime(21915): java.lang.IllegalStateException: Could not execute method for android:onClick
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.view.View$DeclaredOnClickListener.onClick(View.java:4458)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.view.View.performClick(View.java:5204)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.view.View$PerformClick.run(View.java:21153)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.os.Handler.handleCallback(Handler.java:739)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.os.Handler.dispatchMessage(Handler.java:95)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.os.Looper.loop(Looper.java:148)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.app.ActivityThread.main(ActivityThread.java:5417)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at java.lang.reflect.Method.invoke(Native Method)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
12-30 09:28:50.412 E/AndroidRuntime(21915): Caused by: java.lang.reflect.InvocationTargetException
12-30 09:28:50.412 E/AndroidRuntime(21915):     at java.lang.reflect.Method.invoke(Native Method)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at android.view.View$DeclaredOnClickListener.onClick(View.java:4453)
12-30 09:28:50.412 E/AndroidRuntime(21915):     ... 9 more
12-30 09:28:50.412 E/AndroidRuntime(21915): Caused by: java.lang.NumberFormatException: Invalid double: "2.188558E"
12-30 09:28:50.412 E/AndroidRuntime(21915):     at java.lang.StringToReal.invalidReal(StringToReal.java:63)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at java.lang.StringToReal.initialParse(StringToReal.java:94)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at java.lang.StringToReal.parseDouble(StringToReal.java:282)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at java.lang.Double.parseDouble(Double.java:301)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at com.myproject.mvp.presenter.CalcPaymentPresenter.doClickSpecButton(CalcPaymentPresenter.java:144)
12-30 09:28:50.412 E/AndroidRuntime(21915):     at com.myproject.ui.CalcPaymentActivity.onClickSpecButton(CalcPaymentActivity.java:106)
12-30 09:28:50.412 E/AndroidRuntime(21915):     ... 11 more

Answer 1

Caused by: java.lang.NumberFormatException: Invalid double: "2.188558E"

您的实际数字看起来像是在末尾被切开，在E后面应该有一个数字，因为这是科学计数法。

Answer 2

原因是“ 2.188558E”不是有效的双精度数。您需要先测试String或捕获此类异常

double w;

try {
   w = new Double(input3.getText().toString());
} catch (NumberFormatException e) {
   w = 0; // your default value
}

Answer 3

最后一位（或两位）似乎被截断了。 “ 2.188558E”应该是在“ 2.188558E-2”上的某行或类似内容。检查字符串的来源以查找问题。

有关双重表示法，请参见this answer for more info

Answer 4

由于您正在使用科学计数法分析字符串，因此必须执行以下操作：

Double.parseDouble("2.188558E+1");

原因：java.lang.NumberFormatException：无效的双精度：“ 2.188558E”

4 个答案: