Android 如果我知道图像的名称，如何获取图像的资源 ID？
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How do I get the resource id of an image if I know its name?
提问by manu
How do I get the resource id of an image if I know its name (in Android)?
如果我知道图像的名称（在 Android 中），如何获取图像的资源 ID？
回答by Francesco Laurita
With something like this:
像这样：
String mDrawableName = "myappicon";
int resID = getResources().getIdentifier(mDrawableName , "drawable", getPackageName());
回答by VSB
You can also try this:
你也可以试试这个：
try {
Class res = R.drawable.class;
Field field = res.getField("drawableName");
int drawableId = field.getInt(null);
}
catch (Exception e) {
Log.e("MyTag", "Failure to get drawable id.", e);
}
I have copied this source codes from below URL. Based on tests done in this page, it is 5 times faster than getIdentifier(). I also found it more handy and easy to use. Hope it helps you as well.
我从下面的 URL 复制了这个源代码。根据本页中完成的测试，它比 getIdentifier() 快 5 倍。我还发现它更方便易用。希望它也能帮助你。
回答by naXa
Example for a public system resource:
公共系统资源的示例：
// this will get id for android.R.drawable.ic_dialog_alert
int id = Resources.getSystem().getIdentifier("ic_dialog_alert", "drawable", "android");
Another way is to refer the documentation for android.R.drawableclass.
另一种方法是参考android.R.drawable类的文档。
回答by Azhar
You can use this function to get a Resource ID:
您可以使用此函数获取资源 ID：
public static int getResourseId(Context context, String pVariableName, String pResourcename, String pPackageName) throws RuntimeException {
try {
return context.getResources().getIdentifier(pVariableName, pResourcename, pPackageName);
} catch (Exception e) {
throw new RuntimeException("Error getting Resource ID.", e)
}
}
So if you want to get a DrawableResource ID, you can call the method like this:
所以如果你想获得一个DrawableResource ID，你可以像这样调用方法：
getResourseId(MyActivity.this, "myIcon", "drawable", getPackageName());
(or from a fragment):
（或来自片段）：
getResourseId(getActivity(), "myIcon", "drawable", getActivity().getPackageName());
For a StringResource ID you can call it like this:
对于字符串资源 ID，您可以这样称呼它：
getResourseId(getActivity(), "myAppName", "string", getActivity().getPackageName());
etc...
等等...
Careful: It throws a RuntimeException if it fails to find the Resource ID. Be sure to recover properly in production.
小心：如果找不到资源 ID，它会抛出 RuntimeException。确保在生产中正确恢复。
回答by sunil shah
One other scenario which I encountered.
我遇到的另一种情况。
String imageName ="Hello" and then when it is passed into getIdentifier function as first argument, it will pass the name with string null termination and will always return zero. Pass this imageName.substring(0, imageName.length()-1)
String imageName ="Hello" 然后当它作为第一个参数传递给 getIdentifier 函数时，它将传递带有字符串 null 终止的名称，并且将始终返回零。传递这个 imageName.substring(0, imageName.length()-1)
