如何在Android中实现片段中的3个选项卡和底部的4个选项卡

Question

I have 4 activities in android. I want to implement 3 tabs in each activity and 4 tabs at bottom to control 4 activities. For each activity, it has 3 fragments, and each tab control one fragment. For 4 Tabs at bottom, they just navigate to 4 activities and there are no relationship among the activities. What's the practical way to implement 4 bottom tabs?

Thanks in advance!

picture 1: first activity picture 2: second activity!

Answer 1

Create an XML file for the bottom tabs. It should be a horizontal LinearLayout (wrap_content height and match_parent width) with your four ImageView buttons that switch between activities. Each button's icon in the XML should have the unselected state. Each button should be wrap_content and layout_weight="1".

In each of your activity's XML, make the root view a RelativeLayout, include the bottom-tab layout XML described above, make it alignParentBottom="true", and put the rest of your content above the tabs.

In each activity's onCreate, find that Activity's ImageView button, and change the styling to the selected version. Also set listeners on the other buttons to launch the corresponding activities (you could use a shared helper function for this to share the code).

For the fragment tabs on each Activity, you can use the standard ViewPager and FragmentPagerAdapter that Google is encouraging.

Let me know if you need more details for any of this.