将小程序换成体验版，就OK了，开发版在安卓上有问题，

多用几个版本试试

https://developers.weixin.qq.com/community/develop/doc/000c2ec0ab09804af1a97ca6f56c00?fromCreate=1

看一下上个小程序是否关闭

wx.navigateBackMiniProgram({

    extraData: {

        state: 1

    },

    success(res) {

        // 返回成功

    },

    fail(err) {

        console.log(err.errMsg);

        wx.showModal({

            title: '错误',

            content: err.errMsg,

            showCancel: false,

            success(r) {

                // 可在这里处理用户点击确定后的逻辑

            }

        });

    }

});

错误信息是navigateBackMiniProgram:fail not MiniProgram can navigate back.