Highly adaptive
ListView is a very common part of Android development, and it is used in all kinds of APP, whether it is QQ's chat list or WeChat's official account list.
In practice, we have encountered such a problem:
Maybe I want the ListView to be nested in the ScrollView, and there are many other components in the ScrollView itself, so as to form a whole.
But in practice, it is found that as long as the ListView is placed in the ScrollView, the height will become only one line, which greatly affects the experience.
Therefore, I decided to write a highly adaptive function by myself.
Get list object
val listAdapter = recentView.adapter
Traversal elements, adding height
for (i in 0 until listAdapter.count) { val listItem = listAdapter.getView(i, null, recentView) listItem.measure(0, 0) totalHeight += listItem.measuredHeight }
LayoutParams settings
val params = recentView.layoutParams params.height = totalHeight + (recentView.dividerHeight * (listAdapter.count - 1)) recentView.layoutParams = params
Effect of automatic measurement
Different lists share ListView
Take the homepage as an example:
In fact, you don't need to assign a Fragment to each tag. When you need to click to a certain point, you can process it again.
But there is such a problem that you cannot set the List directly.
On the one hand, because the element types in each List are different, on the other hand, even for elements of the same type, their click jump may be different.
So, after groping, I came up with a relatively good solution.
Assign a List to each List
var globalList = LinkedList<ArticleItem>() var globalList_2 = LinkedList<ArticleItem>() var globalList_3 = LinkedList<TopItem>() var globalList_4 = LinkedList<TopItem>()
Set Adapter and List elements
// Configure list fun setLikestList(list: LinkedList<TopItem>) { val mAdapter = TopItemAdapter(list, activity) // monitor val onClickListener = object : AdapterView.OnItemClickListener{ override fun onItemClick(parent: AdapterView<*>?, view: View?, position: Int, id: Long) { val bundle = arguments val token = bundle!!.getString("token").toString() val blogIntent = Intent(activity, BlogActivity::class.java) blogIntent.putExtra("id", list.get(position).id) blogIntent.putExtra("token", token) startActivity(blogIntent) } } val listView = activity!!.findViewById<ListView>(R.id.index_blog_list) listView.adapter = mAdapter listView.setOnItemClickListener(onClickListener) }
Record the location of the current page
var currentPage = 1 var listPage = 1 var lastItem = 0
Judge the list first when switching pages, and refresh only when pulling down
val listener_1 = object : View.OnClickListener { override fun onClick(v: View?) { refreshTabs() tab_1.setTextColor(activity!!.getColor(R.color.bBlue)) currentPage = 1 val swipeView:SwipeRefreshLayout = activity!!.findViewById(R.id.index_swipe_layout) swipeView.isRefreshing = true if (!globalList.isEmpty()) { setSubList(globalList) swipeView.isRefreshing = false } else { fetchSubData() } } }
Judge the current page when pulling down to refresh
val onRefreshListener = SwipeRefreshLayout.OnRefreshListener { // Up to top // Toast.makeText(activity, "refreshing...", Toast.LENGTH_SHORT).show() if(currentPage == 1){ fetchSubData() } else if(currentPage == 2){ globalList_2 = LinkedList<ArticleItem>() listPage = 1 fetchLatestData(listPage) } else if(currentPage == 3){ fetchHotData() } else if(currentPage == 4){ fetchLikestData() } }
Effect achieved
