Android Lib Project与Android Project中R文件的区别

Android Lib Project中生产的R文件内，都不是常量。

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */
public final class R {

    public static final class string {
        public static int action_settings=0x7f050001;
        public static int app_name=0x7f050000;
        public static int hello_world=0x7f050002;
    }

}
           

Android Project中生产的R文件内，都是常量。

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */
public final class R {

    public static final class string {
        public static final int action_settings=0x7f050001;
        public static final int app_name=0x7f050000;
        public static final int hello_world=0x7f050002;
    }

}
           

所以当你的项目中有用到switch的地方，同时条件又用到了 R 中的常量时，将此project转成lib project的话就会报错。要求你将 switch-case 换成 if-else。

As of ADT 14, resource fields cannot be used as switch cases. Invoke this fix to get more information.