验证编辑文本 [英] Validation on Edit Text

问题描述

我想知道如何对 EditText 进行验证.例如，我有一个只应接受数值的 EditText.如果用户输入的不是数字值，那么它应该显示一条警告消息(即请使用数字值....").

I would like to know how to make a validation on EditText. For example, I have one EditText that should only accept numeric values. If something other than a numeric value is typed by the user then it should show an alert message (i.e. "please use a numeric value....").

是否有功能可用于确定输入的文本是否为特定类型?如果可能，请附上代码片段.

Is there a function available to find out if the entered text is particular type? If possible please include a code snippet.

推荐答案

与其制作弹出窗口，不如将提示集成到 EditText 中，这样用户只能在 EditText 中键入数字(android:数字，机器人:提示):

Rather than make a pop-up I would integrate a hint into the EditText and I would make it so the user could only type numbers into the EditText (android:numeric, android:hint):

        <EditText android:layout_height="wrap_content"
                      android:numeric="integer"
                      android:hint="@string/numberHint"
                      android:gravity="left"
                      android:id="@+id/name" 
                      android:layout_width="wrap_content" 
                      android:maxWidth="60dp" 
                      android:textSize="6pt">
        </EditText>

更多信息可在此处获得:http://developer.android.com/reference/android/widget/EditText.html

More information is available here: http://developer.android.com/reference/android/widget/EditText.html

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