如何使用Android服务标志？

Question

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.

Answer 1

它是二进制标志，你需要二元运算符（|）来连接它，不是逻辑运算符。

Answer 2

public static final int START_FLAG_REDELIVERY = 1; public static final int START_FLAG_RETRY = 2;

0x01 | 0x02 ==＆gt; 0x03 ==＆gt;二进制00000011 ===＆gt; ＆安培;旗帜