为什么我不能强制EditTextPreference只接受数字? [英] Why I can't enforce EditTextPreference to take just numbers?

问题描述

目标:使用EditTextPreference接受用户输入的数字.

GOAL: Use EditTextPreference to take a number input from an user.

问题::我使用的是support.v7.preference，据我所知，该库在创建自定义DialogPreference时会带来问题(

PROBLEM: I'm using support.v7.preference and, from what I've understood, this library bring problems to creates a custom DialogPreference (HowTo use support.v7.preference with AppCompat and potential drawbacks). Anyway I tried to create a NumberPickerPreference extending DialogPreference but I got ClassCastException.

我还发现了另一种方法:以编程方式设置EditTextPreference对象的输入类型，如下所示:

Also I found another approach: programmatically set the input type of an EditTextPreference object like below:

    EditTextPreference pref = (EditTextPreference) findPreference("pref_edit_text");
    if (pref != null) {
       pref.getEditText().setInputType(InputType.TYPE_CLASS_NUMBER);
    }

没办法，我总是得到ClassCastException.

我尝试过的最后一种方法:修改xml

Last approach I tried : modify the xml

android:inputType="numberDecimal"
android:digits="0123456789"

或android:numeric="integer"

再也没有办法，在Dialog上我得到了完整的键盘，因此用户可以编写所有内容.

No way again, on the Dialog I get the full keyboard, so the user can write everything.

有没有办法适当地强制EditTextReference接受数字输入?

Is there a way to properly enforce EditTextReference to take just number input?

推荐答案

尝试以下方法之一:

android:inputType="numberSigned" 
android:inputType="phone"

android:inputType="numberDecimal|numberSigned"
android:digits="0123456789"

如果您愿意尝试的话，可以使用这个库来使它工作:

There´s this lib that is supposed to make it work, if you´re willing to try:

https://github.com/Gericop/Android-Support-Preference -V7-Fix

阅读他们的github页面，您可以找到自定义输入的示例以及它们的示例代码，这些示例看起来与您现在正在做的事情相似:

Reading their github page you can find examples of custom inputs and their example code that looks similar to what you are doing now:

该示例应用程序显示了一个示例(通过XML进行设置)和(以编程方式)查询EditTextPreference的输入类型:

"The sample app shows an example of setting (via XML) and querying (programmatically) the input type of the EditTextPreference:

<EditTextPreference
    android:inputType="phone"
    android:key="edit_text_test" />

EditTextPreference etPref = (EditTextPreference) findPreference("edit_text_test");
if (etPref != null) {
    int inputType = etPref.getEditText().getInputType();
    // do something with inputType
}

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