NumberFormatException错误 [英] NumberFormatException Error
本文介绍了NumberFormatException错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
代码是:
editText2=(EditText) findViewById(R.id.editText2);
editText3=(EditText) findViewById(R.id.editText3);
float from_value= Float.parseFloat(editText2.getText().toString());
editText3.setText(" "+(from_value * 100.0));
并且logcat错误是:
And the logcat error is:
03-18 03:19:07.847:E / AndroidRuntime(875):引起:java.lang.NumberFormatException:无效的浮点数:
03-18 03:19:07.847: E/AndroidRuntime(875): Caused by: java.lang.NumberFormatException: Invalid float: ""
推荐答案
似乎editText2中的String为空,因此无法将其解析为float。
Seems like the String in editText2 is empty, so it fails to parse it as float.
一个可能的解决方案是首先检查String是否为空,然后确定默认值,另一个是捕获异常:
A possible solution is to check if the String is empty first, and then decide about default value, another is to catch the exception:
float from_value;
try {
from_value = Float.parseFloat(editText2.getText().toString());
}
catch(NumberFormatException ex) {
from_value = 0.0; // default ??
}
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