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In the switch statement,I use some constants which are defined in another class. The IDE tell me constant expression required.

I am writing an Android app, and in the MainActivity I write like this:

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;
}

and in another class I use the switch statement like this:

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;
}

the Android Studio tell me that constant expression required,but I truely use static fianl int. Maybe you can help solve this problem,Thanks.

Shuai Wang
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1 Answers1

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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;
            }

    }
}
Danielson
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