空指针问题，绑定service不成功问题
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.hwy.mymusicplayer.services.MusicService$MusicBind.playMusic()' on a null object reference
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java.lang.NullPointerException: Attempt to invoke virtual method 'void com.hwy.mymusicplayer.services.MusicService$MusicBind.playMusic()' on a null object reference
2019-12-15
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