Fix Navigation error: App crash when pushing back. - #104
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zimya
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当前从任意页面返回都会导致app直接退出，同时logcat报错：
参考官方文档，推荐使用
removeLastOrNull()方法来弹出返回栈。修复首页进入时只有home按钮的问题。
调整配色问题。在条目页/人物页/小组页/目录页/我的页，顶部有一个模糊的背景图，上面有文字。但是文字颜色目前由主题颜色决定，导致如果背景图为白色-文字为白色，或背景图为黑色-文字为黑色时，文字就会看不清。
所以我将文字颜色设置为跟据背景图的深浅决定，可以缓解看不清楚的情况。修改前后对比：
底栏tab的文字颜色从固定色到适应主题色。