如何通过名称获取"public static final int"值？

Question

我创建了一个扩展KeyEvent的类:

public class myKeyEvent extends KeyEvent {
    public static final int MY_KEYCODE_01 = KeyEvent.KEYCODE_A;
    //...
    public static final int MY_KEYCODE_30 = KeyEvent.KEYCODE_Z;
}

现在,我想从另一个类(另一个文件)获取变量名称的Integer值(例如"MY_KEYCODE_01"应该返回整数值KeyEvent.KeyCODE_A).

我试过了:

try{
    Class cls = myKeyEvent.class.getClass();
    Field field = cls.getDeclaredField("MY_KEYCODE_01");
    int value = (Integer) field.get(cls);
    Log.v("TAG", "Field value is " + value);

} catch (NoSuchFieldException e) {
    Log.e("TAG", "Field either doesn't exist or is not public: " + e.toString() );
}

在LogCat中:

Field either doesn't exist or is not public: java.lang.NoSuchFieldException: MY_KEYCODE_01

我该怎么做？

Answer 1

类是myKeyEvent.class,如果你这样做myKeyEvent.class.getClass(),你所得到的类的类对象,它是的Class.删除getClass()

您应该能够在调试器中看到类不正确.