如何强制元数据值键入字符串? [英] How to force a meta-data value to type string?

问题描述

我在manifest.xml中指定了一个元数据，如下所示:

I specified a meta-data in my manifest.xml like this:

<meta-data android:value="5555555555" android:name="foo"></meta-data>

当访问这样的元数据时:

When accessing the meta data like this:

ActivityInfo ai = act.getPackageManager().getActivityInfo(componentName, PackageManager.GET_META_DATA);
Object value = (Object)ai.metaData.get(key);

此值被解释为int，更重要的是，其解释不正确(1260588259).

this value gets interpreted as int and - more importantly - incorrectly interepreted (1260588259).

由于类型是由构建系统自动确定的(布尔值，整数，浮点数和字符串)，所以我想知道是否有任何方法可以将数据类型强制为字符串.

Since the type is determined automatically by the build system ( booleans, ints, floats and strings ) i wondered if there is any way to force the datatype to string.

我尝试在末尾添加一个空格("5555555555")，但是随后该值被解释为5.5555553E9 float！ ).

I tried adding a space at the end ( "5555555555 "), but then the value gets interpreted as 5.5555553E9 float! ).

我也尝试使用getString代替get，但是返回null.

I also tried using getString instead of get, but then null is returned.

有什么想法吗? TIA.

Any ideas? TIA.

推荐答案

在数字前放置一个转义的空格似乎可行:

Putting an escaped space in front of the number seems to work:

<meta-data android:name="foo" android:value="\ 1234567890"/>

转义的空格不会出现在get()返回的值中.

The escaped space doesn't appear in the value returned by get().

老实说，我不知道它是如何工作的.

I have no idea quite how this works, if I'm honest.

如果您要有记载的东西，因此还有更多可靠，您始终可以将字符串值作为资源并引用它:

If you want something documented and therefore more reliable you can always put your string value as a resource and refer to it:

<meta-data android:name="foo" android:resource="@string/mynumber"/>

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