如果字符串包含0-9其他字符的Andr​​oid检查 [英] android check if string contains characters other than 0-9

问题描述

我创造了游戏计数点的应用程序。这个程序有一个的EditText组件。我要检查如果从编辑文本检索到的字符串包含0-9其它字符。这是因为我的应用程序包含一个integer.parse功能至极崩溃，如果不是0-9其它字符便被输入。所有帮助将大大AP preciated。先谢谢了。

I am creating an app for counting points in games. This app has a edittext component. I want to check if the string retrieved from the edit text contains characters other than 0-9. This is because my app contains a integer.parse function wich crashes if characters other than 0-9 is inputed. All help will be greatly appreciated. Thanks in advance.

推荐答案

如果你只是想通知无效字符的用户，那么你可以在的try / catch把它包并据此采取行动。

If you just want to notify the user of an invalid character then you can wrap it in a try/catch and act accordingly

try
{
    int someInt = Integer.parseInt(et.getText().toString());
    // other code
}
catch (NumberFormatException e)
{
    // notify user with Toast, alert, etc...
}

您也可以使用定期前pression 找你要根据你的需要/不想要的字符。

You also can use a regular expression to look for the characters you want/don't want depending on your needs.

只是要万一我的code注释没有，我建议你做一些不同之处并通知用户清除即可。不要抓住它，让它坐

Just to be clear in case my code comment wasn't, I am suggesting that you do something with the exception and notify the user. Don't catch it and let it sit

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