java：需要常量表达式。开关状态使用在另一个计算中定义的一些常量

在switch语句中，我使用了在另一个类中定义的一些常量。 IDE告诉我所需的

常量表达式

我正在编写一个Android应用程序，在MainActivity中我这样写：

private static final int HOMEFRAGMENTINDEX = 0;
private static final int MESSAGEFRAGMENTINDEX = 1;
private static final int SNSFRAGMENTINDEX = 2;
private static final int DISCOVERYFRAGMENTINDEX = 3;
private static final int MINEFRAGMENTINDEX = 4;

public static int getHomefragmentindex() {
    return HOMEFRAGMENTINDEX;
}

public static int getMessagefragmentindex() {
    return MESSAGEFRAGMENTINDEX;
}

public static int getSnsfragmentindex() {
    return SNSFRAGMENTINDEX;
}

public static int getDiscoveryfragmentindex() {
    return DISCOVERYFRAGMENTINDEX;
}

public static int getMinefragmentindex() {
    return MINEFRAGMENTINDEX;
}

final int homeFragmentIndex = MainActivity.getHomefragmentindex();
final int messageFramentIndex = MainActivity.getMessagefragmentindex();
final int snsFragmentIndex = MainActivity.getSnsfragmentindex();
final int discoveryFragmentIndex = MainActivity.getDiscoveryfragmentindex();
final int mineFragentIndex = MainActivity.getMinefragmentindex();

switch (mCurIndicator) {
case homeFragmentIndex:
    // do something
    break;
case messageFramentIndex:
    // do something
    break;
case snsFragmentIndex:
    // do something
    break;
case discoveryFragmentIndex:
    // do something
    break;
case mineFragentIndex:
    // do something
    break;
default:
    break;
}

在另一个类中，我使用如下switch语句：

private static final int HOMEFRAGMENTINDEX = 0;
private static final int MESSAGEFRAGMENTINDEX = 1;
private static final int SNSFRAGMENTINDEX = 2;
private static final int DISCOVERYFRAGMENTINDEX = 3;
private static final int MINEFRAGMENTINDEX = 4;

public static int getHomefragmentindex() {
    return HOMEFRAGMENTINDEX;
}

public static int getMessagefragmentindex() {
    return MESSAGEFRAGMENTINDEX;
}

public static int getSnsfragmentindex() {
    return SNSFRAGMENTINDEX;
}

public static int getDiscoveryfragmentindex() {
    return DISCOVERYFRAGMENTINDEX;
}

public static int getMinefragmentindex() {
    return MINEFRAGMENTINDEX;
}

final int homeFragmentIndex = MainActivity.getHomefragmentindex();
final int messageFramentIndex = MainActivity.getMessagefragmentindex();
final int snsFragmentIndex = MainActivity.getSnsfragmentindex();
final int discoveryFragmentIndex = MainActivity.getDiscoveryfragmentindex();
final int mineFragentIndex = MainActivity.getMinefragmentindex();

switch (mCurIndicator) {
case homeFragmentIndex:
    // do something
    break;
case messageFramentIndex:
    // do something
    break;
case snsFragmentIndex:
    // do something
    break;
case discoveryFragmentIndex:
    // do something
    break;
case mineFragentIndex:
    // do something
    break;
default:
    break;
}

---

Android Studio告诉我需要

常量表达式

，但我真正使用的是

静态fianl int

。也许您可以帮助解决这个问题，谢谢。

McUriIndicator是什么？如果您不调用get方法，但使private statics->public static和call thosestatic不能在常量为或用于McUriIndicator的方法中完成，McUriIndicator是private static intHi，这会有帮助吗？谢谢您的建议。但我在A类中定义了这些常量，在B类中使用了switch语句，所以我想知道如何做到这一点。这就是为什么它们是公共的…'您的类名。变量名“。。。给它一个镜头是的，使用公共是正确的。谢谢你的耐心。@ShuaiWang你能接受答案吗…：-）当然，我做了。谢谢

class Some{
    public static final int HOMEFRAGMENTINDEX = 0;
    public static final int MESSAGEFRAGMENTINDEX = 1;
    public static final int SNSFRAGMENTINDEX = 2;
    public static final int DISCOVERYFRAGMENTINDEX = 3;
    public static final int MINEFRAGMENTINDEX = 4;

}

class AnotherClass{
    void yourMethod(int mCurIndicator){ 
        switch (mCurIndicator) {
            case Some.HOMEFRAGMENTINDEX:
                // do something
                break;
            case Some.MESSAGEFRAGMENTINDEX:
                // do something
                break;
            case Some.SNSFRAGMENTINDEX:
                // do something
                break;
            case Some.DISCOVERYFRAGMENTINDEX:
                // do something
                break;
            case Some.MINEFRAGMENTINDEX:
                // do something
                break;
            default:
                break;
            }

    }
}