我的Android应用无法识别R.string资源-可能是什么原因？

Question

I learn android with sample apps from textbook. In the given sample source R.string.something is recognized:

However, in my own EXACT source code, same R.strings are not recognized- highlighted as errors:

Does anyone know how to fix it?

Answer 1

尝试清理您的项目，如果什么都不做，请单击问题选项卡，查看是否有任何与构建相关的问题，您可能缺少必需的jar或其他东西！

Answer 2

These are following reason possible.

1-: You import android.R;

2-: Any error in xml files.

3-: Please check you String.xml file may be any error or declare a string more then two time.

Answer 3

I've had this many time with eclipse, and it was not a setup / code problem on my side. Generally, cleaning, rebuilding and sometime even stopping and restarting eclipse solved it. And yes, it's a pain in the neck ...

Answer 4

I assume you are new to Android.

If so, there are two ways of using text strings in Buttons, textviews and so on:

1) Hardcoded string - you put the text you want in quotation marks (""), for example:

yourTextview.setText("Hardcoded string");

2) You can call the text from your String resources (res/values/strings.xml). That is a much better approach seeing is is easier to translate, make changes and so on.

In your strings.xml file you can create all your string values, and call them from there. Like in you example, if in your strings.xml file you have for example:

<string name="delete">This is String resource</string>

you can then call the string from there, like so :

yourTextview.setText(R.string.delete);

Hope this helps!