java 如何从 JNI 返回枚举
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how to return enum from JNI
提问by krt
In java I have:
在java中我有：
public class MyClass{
public enum STATUS {
ZERO,
ONE ,
TWO
}
public native STATUS nativeGetStatus();
...
private STATUS state = nativeGetStatus(); //returns enum
private STATUS state2 = nativeGetStatus(); //returns enum
}
I want native method 'nativeGetStatus' to return this enum value.
我希望本机方法 'nativeGetStatus' 返回此枚举值。
JNI returning integer and comparing with value of enum in java is an option, but was wondering is it possible to return value via jobject and assign it directly to state ? if yes how?
JNI 返回整数并与 java 中的枚举值进行比较是一个选项，但想知道是否可以通过 jobject 返回值并将其直接分配给 state ？如果是，如何？
采纳答案by Vladimir Ivanov
回答by cweigel
I struggled with the accepted answer since I couldn't figure out the signature of the static field for a while. So here's the JNI implementation that should work with the example above (not tested):
我为接受的答案苦苦挣扎，因为我有一段时间无法弄清楚静态字段的签名。所以这是应该与上面的例子一起工作的 JNI 实现（未经测试）：
jclass clSTATUS = env->FindClass("MyClass$STATUS");
jfieldID fidONE = env->GetStaticFieldID(clSTATUS , "ONE", "LMyClass$STATUS;");
jobject STATUS_ONE = env->GetStaticObjectField(clSTATUS, fidONE);
return STATUS_ONE;
