Android Coil3阶梯preload批量Bitmap拼接扁平宽图，Kotlin

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_MEDIA_IMAGES" /><uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />

    implementation("io.coil-kt.coil3:coil:3.1.0")implementation("io.coil-kt.coil3:coil-gif:3.1.0")implementation("io.coil-kt.coil3:coil-core:3.1.0")

import android.content.ContentUris
import android.content.Context
import android.net.Uri
import android.os.Bundle
import android.provider.MediaStore
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import coil3.ImageLoader
import coil3.memory.MemoryCache
import coil3.request.ImageRequest
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launchclass MainActivity : AppCompatActivity() {companion object {const val THUMB_WIDTH = 150const val THUMB_HEIGHT = 150const val ROW_SIZE = 16const val TAG = "fly/MainActivity"}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val rv = findViewById<RecyclerView>(R.id.rv)val layoutManager = LinearLayoutManager(this)layoutManager.orientation = LinearLayoutManager.VERTICALval imageLoader = MyCoilManager.INSTANCE.getImageLoader(this)val adapter = MyAdapter(this, imageLoader)rv.adapter = adapterrv.layoutManager = layoutManagerrv.setItemViewCacheSize(ROW_SIZE * 10)rv.recycledViewPool.setMaxRecycledViews(0, ROW_SIZE * 10)val ctx = thislifecycleScope.launch(Dispatchers.IO) {val imgList = readAllImage(ctx)val videoList = readAllVideo(ctx)Log.d(TAG, "readAllImage size=${imgList.size}")Log.d(TAG, "readAllVideo size=${videoList.size}")val lists = arrayListOf<MyData>()lists.addAll(imgList)lists.addAll(videoList)val total = lists.sizeLog.d(TAG, "总数量=$total")lists.shuffle()val sliceLists = sliceDataList(lists)lifecycleScope.launch(Dispatchers.Main) {adapter.dataChanged(sliceLists)}val probability = 0.8flists.forEachIndexed { idx, myData ->if (idx in 500..2000) {Log.d(TAG, "$idx/$total preload")preload(imageLoader, myData)} else if (2000 < idx && Math.random() <= probability) {Log.d(TAG, "$idx/$total preload")preload(imageLoader, myData)}}}}private fun preload(imageLoader: ImageLoader, myData: MyData) {val thumbItem = Item(uri = myData.uri, path = myData.path)thumbItem.type = Item.THUMBval thumbMemoryCacheKey = MemoryCache.Key(thumbItem.toString())val thumbMemoryCache = MyCoilManager.INSTANCE.getMemoryCache(thumbMemoryCacheKey)if (thumbMemoryCache == null) {val thumbReq = ImageRequest.Builder(this).data(thumbItem).size(THUMB_WIDTH, THUMB_HEIGHT).memoryCacheKey(thumbMemoryCacheKey).build()imageLoader.enqueue(thumbReq)}}class MyData(var path: String, var uri: Uri)private fun sliceDataList(data: ArrayList<MyData>): ArrayList<ArrayList<MyData>> {var k: Intval lists = ArrayList<ArrayList<MyData>>()for (i in data.indices step ROW_SIZE) {val temp = ArrayList<MyData>()k = 0for (j in 0 until ROW_SIZE) {k = i + jif (k >= data.size) {break}temp.add(data[k])}lists.add(temp)}return lists}private fun readAllImage(ctx: Context): ArrayList<MyData> {val photos = ArrayList<MyData>()//读取所有图val cursor = ctx.contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null)while (cursor!!.moveToNext()) {//路径val path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA))val id = cursor.getColumnIndex(MediaStore.Images.ImageColumns._ID)val imageUri: Uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, cursor.getLong(id))//名称//val name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME))//大小//val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.SIZE))photos.add(MyData(path, imageUri))}cursor.close()return photos}private fun readAllVideo(context: Context): ArrayList<MyData> {val videos = ArrayList<MyData>()//读取视频Videoval cursor = context.contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,null,null,null,null)while (cursor!!.moveToNext()) {//路径val path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA))val id = cursor.getColumnIndex(MediaStore.Images.ImageColumns._ID)val videoUri: Uri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, cursor.getLong(id))//名称//val name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME))//大小//val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE))videos.add(MyData(path, videoUri))}cursor.close()return videos}
}

import android.net.Uriclass Item {companion object {const val THUMB = 0const val IMG = 1}var uri: Uri? = nullvar path: String? = nullvar lastModified = 0Lvar width = 0var height = 0var position = -1var type = -1  //0,缩略图。 1，正图image。-1,未知。constructor(uri: Uri, path: String) {this.uri = urithis.path = path}override fun toString(): String {return "Item(uri=$uri, path=$path, lastModified=$lastModified, width=$width, height=$height, position=$position, type=$type)"}
}

import android.content.Context
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import coil3.ImageLoader
import com.appdemo.MainActivity.MyDataclass MyAdapter : RecyclerView.Adapter<MyAdapter.ImageHolder> {private var mCtx: Context? = nullprivate var mImageLoader: ImageLoader? = nullprivate var mItems = ArrayList<ArrayList<MyData>>()companion object {const val TAG = "fly/ImageAdapter"}constructor(ctx: Context, il: ImageLoader?) : super() {mCtx = ctxmImageLoader = il}fun dataChanged(items: ArrayList<ArrayList<MyData>>) {this.mItems = itemsnotifyDataSetChanged()}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ImageHolder {val view = MyImgView(mCtx!!, mImageLoader)return ImageHolder(view)}override fun onBindViewHolder(holder: ImageHolder, position: Int) {holder.image.setData(mItems[position])}override fun getItemCount(): Int {return mItems.size}class ImageHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {var image = itemView as MyImgView}
}

import android.app.Application
import android.util.Log
import coil3.ImageLoader
import coil3.PlatformContext
import coil3.SingletonImageLoaderclass MyApp : Application(), SingletonImageLoader.Factory {companion object {const val TAG = "fly/MyApp"}override fun newImageLoader(context: PlatformContext): ImageLoader {Log.d(TAG, "newImageLoader")return MyCoilManager.INSTANCE.getImageLoader(this)}
}

import android.content.Context
import android.os.Environment
import android.util.Log
import coil3.ImageLoader
import coil3.disk.DiskCache
import coil3.disk.directory
import coil3.gif.AnimatedImageDecoder
import coil3.memory.MemoryCache
import coil3.request.CachePolicy
import java.io.Fileclass MyCoilManager {companion object {const val TAG = "fly/MyCoilManager"val INSTANCE by lazy(mode = LazyThreadSafetyMode.SYNCHRONIZED) { MyCoilManager() }}private var mImageLoader: ImageLoader? = nullprivate var memoryCacheMaxSize = 0Lfun getImageLoader(ctx: Context): ImageLoader {if (mImageLoader != null) {Log.w(TAG, "ImageLoader已经初始化")return mImageLoader!!}Log.d(TAG, "初始化ImageLoader")//初始化加载器。mImageLoader = ImageLoader.Builder(ctx).memoryCachePolicy(CachePolicy.ENABLED).memoryCache(initMemoryCache()).diskCachePolicy(CachePolicy.ENABLED).diskCache(initDiskCache()).components {add(AnimatedImageDecoder.Factory())add(ThumbFetcher.Factory(ctx))}.build()Log.d(TAG, "memoryCache.maxSize=${mImageLoader!!.memoryCache?.maxSize}")return mImageLoader!!}private fun initMemoryCache(): MemoryCache {//内存缓存。val memoryCache = MemoryCache.Builder().maxSizeBytes(1024 * 1024 * 1024 * 2L) //2GB.build()memoryCacheMaxSize = memoryCache.maxSizereturn memoryCache}private fun initDiskCache(): DiskCache {//磁盘缓存。val diskCacheFolder = Environment.getExternalStorageDirectory()val diskCacheName = "coil_disk_cache"val cacheFolder = File(diskCacheFolder, diskCacheName)if (cacheFolder.exists()) {Log.d(TAG, "${cacheFolder.absolutePath} exists")} else {if (cacheFolder.mkdir()) {Log.d(TAG, "${cacheFolder.absolutePath} create OK")} else {Log.e(TAG, "${cacheFolder.absolutePath} create fail")}}val diskCache = DiskCache.Builder().maxSizeBytes(1024 * 1024 * 1024 * 2L) //2GB.directory(cacheFolder).build()Log.d(TAG, "cache folder = ${diskCache.directory.toFile().absolutePath}")return diskCache}fun getMemoryCache(key: MemoryCache.Key): MemoryCache.Value? {return mImageLoader?.memoryCache?.get(key)}fun calMemoryCache(): String {val sz = mImageLoader?.memoryCache?.sizereturn "${sz?.toFloat()!! / memoryCacheMaxSize.toFloat()} , $sz / $memoryCacheMaxSize"}
}

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.RectF
import android.util.Log
import androidx.appcompat.widget.AppCompatImageView
import androidx.core.graphics.toRect
import coil3.ImageLoader
import coil3.memory.MemoryCache
import coil3.request.ErrorResult
import coil3.request.ImageRequest
import coil3.request.SuccessResult
import coil3.toBitmap
import com.appdemo.MainActivity.MyDataclass MyImgView : AppCompatImageView {companion object {const val TAG = "fly/MyImgView"//整数相除，精度损失的平衡因子const val BALANCE_FACTOR = 1}private var mCtx: Context? = nullprivate var mImageLoader: ImageLoader? = nullprivate var mHeight: Int = 0private var mRealSize: Int = 0private var mBmp = mutableListOf<DataBean>()constructor(ctx: Context, il: ImageLoader?) : super(ctx) {mCtx = ctxmImageLoader = ilmHeight = resources.displayMetrics.widthPixels / MainActivity.ROW_SIZE + BALANCE_FACTORscaleType = ScaleType.CENTER_CROP}fun setData(data: ArrayList<MyData>) {mRealSize = data.sizevar loadCount = 0data.forEachIndexed { _, myData ->val thumbItem = Item(uri = myData.uri, path = myData.path)thumbItem.type = Item.THUMBval thumbMemoryCacheKey = MemoryCache.Key(thumbItem.toString())val thumbMemoryCache = MyCoilManager.INSTANCE.getMemoryCache(thumbMemoryCacheKey)if (thumbMemoryCache == null) {val thumbReq = ImageRequest.Builder(mCtx!!).data(thumbItem).size(MainActivity.THUMB_WIDTH, MainActivity.THUMB_HEIGHT).memoryCacheKey(thumbMemoryCacheKey).listener(object : ImageRequest.Listener {override fun onSuccess(request: ImageRequest, result: SuccessResult) {loadCount++refresh(loadCount, result.image.toBitmap())}override fun onCancel(request: ImageRequest) {Log.w(TAG, "onCancel")loadCount++refresh(loadCount, null)}override fun onError(request: ImageRequest, result: ErrorResult) {Log.e(TAG, "onError")loadCount++refresh(loadCount, null)}}).build()Log.d(TAG, "开始加载...")mImageLoader?.enqueue(thumbReq)} else {Log.d(TAG, "命中缓存 ${MyCoilManager.INSTANCE.calMemoryCache()}")loadCount++refresh(loadCount, thumbMemoryCache.image.toBitmap())}}}private fun refresh(loadCount: Int, bmp: Bitmap?) {val bean = DataBean(bmp)mBmp.add(bean)if (loadCount == mRealSize) {val jBmp = joinBitmap()this@MyImgView.setImageBitmap(jBmp)mBmp.clear()}}data class DataBean(val bitmap: Bitmap?)private fun joinBitmap(): Bitmap {val bmp = Bitmap.createBitmap(mHeight * mRealSize, mHeight, Bitmap.Config.RGB_565)val canvas = Canvas(bmp)canvas.drawColor(Color.LTGRAY)mBmp.forEachIndexed { idx, dataBean ->if (dataBean.bitmap != null) {val w = dataBean.bitmap.widthval h = dataBean.bitmap.heightval mini = Math.min(w, h)val left = (w - mini) / 2fval top = (h - mini) / 2fval right = (w + mini) / 2fval bottom = (h + mini) / 2fval srcRct = RectF(left, top, right, bottom)val dstRctLeft = idx * mHeight.toFloat()val dstRct = RectF(dstRctLeft, 0f, dstRctLeft + mHeight, mHeight.toFloat())canvas.drawBitmap(dataBean.bitmap, srcRct.toRect(), dstRct.toRect(), null)}}return bmp}override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {super.onMeasure(widthMeasureSpec, heightMeasureSpec)setMeasuredDimension(mHeight * mRealSize, mHeight)}
}

import android.content.Context
import android.graphics.Bitmap
import android.util.Log
import android.util.Size
import coil3.ImageLoader
import coil3.asImage
import coil3.decode.DataSource
import coil3.fetch.FetchResult
import coil3.fetch.Fetcher
import coil3.fetch.ImageFetchResult
import coil3.request.Options/*** 例如 FileUriFetcher*/
class ThumbFetcher(private val ctx: Context, private val thumbItem: Item, private val options: Options) : Fetcher {companion object {const val TAG = "fly/ThumbFetcher"}override suspend fun fetch(): FetchResult {var bmp: Bitmap? = nullval t = System.currentTimeMillis()try {bmp = ctx.contentResolver.loadThumbnail(thumbItem.uri!!, Size(MainActivity.THUMB_WIDTH, MainActivity.THUMB_HEIGHT), null)Log.d(TAG, "loadThumbnail time cost=${System.currentTimeMillis() - t} $thumbItem ${MyCoilManager.INSTANCE.calMemoryCache()}")} catch (e: Exception) {Log.e(TAG, "e=$e ThumbItem=$thumbItem")}return ImageFetchResult(bmp?.asImage()!!,true,dataSource = DataSource.DISK)}class Factory(private val ctx: Context) : Fetcher.Factory<Item> {override fun create(data: Item,options: Options,imageLoader: ImageLoader,): Fetcher {return ThumbFetcher(ctx, data, options)}}
}

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