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     嘿，亲！知识可是无价之宝呢，但咱这精心整理的资料也耗费了不少心血呀。小小地破费一下，绝对物超所值哦！如有下载和支付问题，请联系我们QQ(微信同号)：813200300

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   源码介绍

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仿抖音流的图片浏览app，可以不断下滑加载高兴图。预加载屏幕下方的图片。点击可看大图，可保存到本地。

@BindContentView(R.layout.fragment_recycler)
	class UnsplashPhotosFragment : BaseFragment(), UnsplashPhotosItemFactory.UnsplashPhotosItemEventListener, OnLoadMoreListener, androidx.swiperefreshlayout.widget.SwipeRefreshLayout.OnRefreshListener {
	private var adapter: AssemblyRecyclerAdapter? = null
	private var pageIndex = 1
	private var backgroundImageUri: String? = null
	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
	super.onViewCreated(view, savedInstanceState)
	recycler_recyclerFragment_content.layoutManager = androidx.recyclerview.widget.LinearLayoutManager(context)
	refresh_recyclerFragment.setOnRefreshListener(this)
	if (adapter != null) {
	recycler_recyclerFragment_content.adapter = adapter
	} else {
	refresh_recyclerFragment.post { onRefresh() }
	}
	}
	override fun onUserVisibleChanged(isVisibleToUser: Boolean) {
	if (isVisibleToUser) {
	changeBackground(backgroundImageUri)
	}
	}
	private fun changeBackground(imageUri: String?) {
	this.backgroundImageUri = imageUri
	backgroundImageUri?.let { EventBus.getDefault().post(ChangeMainPageBgEvent(it)) }
	}
	private fun loadData(pageIndex: Int) {
	this.pageIndex = pageIndex
	NetServices.unsplash().listPhotos(pageIndex).enqueue(LoadDataCallback(this, pageIndex))
	}
	override fun onClickImage(position: Int, image: UnsplashImage, optionsKey: String) {
	val activity = activity ?: return
	var finalOptionsKey: String? = optionsKey
	// 含有这些信息时，说明这张图片不仅仅是缩小，而是会被改变，因此不能用作loading图了
	if (finalOptionsKey!!.contains("Resize")
	|| finalOptionsKey.contains("ImageProcessor")
	|| finalOptionsKey.contains("thumbnailMode")) {
	finalOptionsKey = null
	}
	@Suppress("UNCHECKED_CAST")
	val images = adapter!!.dataList as List<UnsplashImage>
	val imageArrayList = ArrayList<Image>(images.size)
	images.mapTo(imageArrayList) { Image(it.urls!!.regular!!, it.urls!!.raw!!) }
	ImageDetailActivity.launch(activity, dataTransferHelper.put("urlList", imageArrayList), finalOptionsKey!!, position)
	}
	override fun onClickUser(position: Int, user: UnsplashImage.User) {
	val uri = Uri.parse(user.links!!.html)
	.buildUpon()
	.appendQueryParameter("utm_source", "SketchSample")
	.appendQueryParameter("utm_medium", "referral")
	.appendQueryParameter("utm_campaign", "api-credit")
	.build()
	val intent = Intent(Intent.ACTION_VIEW)
	intent.data = uri
	startActivity(intent)
	}
	override fun onRefresh() {
	if (adapter != null) {
	adapter!!.loadMoreFinished(false)
	}
	if (!refresh_recyclerFragment.isRefreshing) {
	refresh_recyclerFragment.isRefreshing = true
	}
	loadData(1)
	}
	override fun onLoadMore(adapter1: AssemblyAdapter) {
	loadData(pageIndex 1)
	}
	private class LoadDataCallback internal constructor(fragment: UnsplashPhotosFragment, private val pageIndex: Int) : Callback<List<UnsplashImage>> {
	private val reference: WeakReference<UnsplashPhotosFragment> = WeakReference(fragment)
	init {
	if (pageIndex == 1) {
	fragment.hint_recyclerFragment.hidden()
	}
	}
	override fun onResponse(call: Call<List<UnsplashImage>>, response: Response<List<UnsplashImage>>) {
	val fragment = reference.get() ?: return
	if (!fragment.isViewCreated) {
	return
	}
	if (pageIndex == 1) {
	create(fragment, response)
	} else {
	loadMore(fragment, response)
	}
	fragment.refresh_recyclerFragment.isRefreshing = false
	}
	override fun onFailure(call: Call<List<UnsplashImage>>, t: Throwable) {
	val fragment = reference.get() ?: return
	val activity = fragment.activity ?: return
	if (!fragment.isViewCreated) {
	return
	}
	if (pageIndex == 1) {
	fragment.hint_recyclerFragment.failed(t, View.OnClickListener { fragment.onRefresh() })
	fragment.refresh_recyclerFragment.isRefreshing = false
	} else {
	fragment.adapter!!.loadMoreFailed()
	Toast.makeText(fragment.activity, HintView.getCauseByException(activity, t), Toast.LENGTH_LONG).show()
	}
	}
	private fun create(fragment: UnsplashPhotosFragment, response: Response<List<UnsplashImage>>) {
	val activity = fragment.activity ?: return
	val images = response.body()
	if (images == null || images.isEmpty()) {
	fragment.hint_recyclerFragment.empty("No photos")
	return
	}
	val adapter = AssemblyRecyclerAdapter(images)
	adapter.addItemFactory(UnsplashPhotosItemFactory(activity, fragment))
	adapter.setMoreItem(LoadMoreItemFactory(fragment))
	fragment.recycler_recyclerFragment_content.adapter = adapter
	fragment.adapter = adapter
	fragment.changeBackground(images[0].urls!!.thumb)
	}
	private fun loadMore(fragment: UnsplashPhotosFragment, response: Response<List<UnsplashImage>>) {
	val images = response.body()
	if (images == null || images.isEmpty()) {
	fragment.adapter!!.loadMoreFinished(true)
	return
	}
	fragment.adapter!!.addAll(images)
	fragment.adapter!!.loadMoreFinished(images.size < 20)
	fragment.changeBackground(images[0].urls!!.thumb)
	}
	}
	}