如何使用Android服务标志？

我不明白为什么：

if((flags & (Service.START_FLAG_REDELIVERY |Service.START_FLAG_RETRY) != 0)
    // 2 flags are present.

因为：

if((flags & (Service.START_FLAG_REDELIVERY |Service.START_FLAG_RETRY) != 0)
    //it means that at least one of the 2 is present.

假设flags=XY：

if((flags & (Service.START_FLAG_REDELIVERY |Service.START_FLAG_RETRY) != 0)
    //means that X!=0 or Y!=0 not X!=0 and Y!=0.

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它是二进制标志，需要二进制运算符（|）来连接它，而不是逻辑运算符

public static final int START\u FLAG\u REDELIVERY=1； 公共静态最终整数开始标志重试=2

0x01 | 0x02==>0x03==>Binary 00000011====>flag&