Android Coli 3 ImageView load two suit Bitmap thumb and formal，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.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=$type)"}
}
import android.content.ContentUris
import android.content.Context
import android.net.Uri
import android.os.Bundle
import android.provider.MediaStore
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import coil3.ImageLoader
import coil3.memory.MemoryCache
import coil3.request.ImageRequest
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launchclass MainActivity : AppCompatActivity() {companion object {const val THUMB_WIDTH = 30const val THUMB_HEIGHT = 30const val IMAGE_SIZE = 150const val ROW_SIZE = 8const val TAG = "fly/MainActivity"}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val rv = findViewById<RecyclerView>(R.id.rv)val layoutManager = GridLayoutManager(this, ROW_SIZE)layoutManager.orientation = GridLayoutManager.VERTICALrv.layoutManager = layoutManagerval imageLoader = MyCoilManager.INSTANCE.getImageLoader(applicationContext)val adapter = MyAdapter(this, imageLoader)rv.adapter = adapterrv.layoutManager = layoutManagerrv.setItemViewCacheSize(ROW_SIZE * 10)rv.recycledViewPool.setMaxRecycledViews(0, ROW_SIZE * 10)val ctx = thislifecycleScope.launch(Dispatchers.IO) {val imgList = readAllImage(ctx)val videoList = readAllVideo(ctx)Log.d(TAG, "readAllImage size=${imgList.size}")Log.d(TAG, "readAllVideo size=${videoList.size}")val lists = arrayListOf<MyData>()lists.addAll(videoList)lists.addAll(imgList)val total = lists.sizeLog.d(TAG, "总数量=$total")lists.shuffle()lifecycleScope.launch(Dispatchers.Main) {adapter.dataChanged(lists)}val PRELOAD = falseif (PRELOAD) {val probability = 0.85fval from = 30lists.forEachIndexed { idx, myData ->if (idx > from && (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 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.content.Context
import android.graphics.BitmapFactory
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import coil3.Bitmap
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<MyData>()private var mScreenWidth = 0private var mPlaceHolderBmp: Bitmap? = nullprivate var mThumbError: Bitmap? = nullprivate var mImageError: Bitmap? = nullcompanion object {const val TAG = "fly/ImageAdapter"}constructor(ctx: Context, il: ImageLoader?) : super() {mCtx = ctxmScreenWidth = mCtx?.resources?.displayMetrics?.widthPixels!!mImageLoader = ilmPlaceHolderBmp = BitmapFactory.decodeResource(mCtx!!.resources, R.mipmap.loading)mThumbError = BitmapFactory.decodeResource(mCtx!!.resources, android.R.drawable.ic_menu_gallery)mImageError = BitmapFactory.decodeResource(mCtx!!.resources, android.R.drawable.stat_sys_warning)}fun dataChanged(items: ArrayList<MyData>) {this.mItems = itemsnotifyDataSetChanged()}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ImageHolder {val view = MyImgView(mCtx!!, mImageLoader, mScreenWidth, mPlaceHolderBmp, mThumbError, mImageError)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 = ${diskCache.directory.toFile().absolutePath}")return diskCache}fun getMemoryCache(key: MemoryCache.Key): MemoryCache.Value? {return mImageLoader?.memoryCache?.get(key)}fun memoryCache(): MemoryCache? {return mImageLoader?.memoryCache}fun calMemoryCache(): String {val sz = mImageLoader?.memoryCache?.sizereturn "${sz?.toFloat()!! / memoryCacheMaxSize.toFloat()},$sz/$memoryCacheMaxSize"}
}
import android.content.Context
import android.util.Log
import androidx.appcompat.widget.AppCompatImageView
import coil3.Bitmap
import coil3.ImageLoader
import coil3.memory.MemoryCache
import coil3.request.CachePolicy
import coil3.request.Disposable
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 mScreenWidth: Int = 0private var mHeight: Int = 0private var mThumbDisposable: Disposable? = nullprivate var mImageDisposable: Disposable? = nullprivate var mPlaceHolderBmp: Bitmap? = nullprivate var mThumbError: Bitmap? = nullprivate var mImageError: Bitmap? = nullconstructor(ctx: Context,il: ImageLoader?,screenWidth: Int,placeHolderBmp: Bitmap?,thumbError: Bitmap?,imageError: Bitmap?) : super(ctx) {mCtx = ctxmImageLoader = ilmScreenWidth = screenWidthmHeight = mScreenWidth / MainActivity.ROW_SIZE + BALANCE_FACTORscaleType = ScaleType.CENTER_CROPmPlaceHolderBmp = placeHolderBmpmThumbError = thumbErrormImageError = imageError}fun setData(myData: MyData) {clear()val thumbItem = Item(uri = myData.uri, path = myData.path)thumbItem.type = Item.THUMBval thumbMemoryCacheKey = MemoryCache.Key(thumbItem.toString())val thumbMemoryCache = MyCoilManager.INSTANCE.getMemoryCache(thumbMemoryCacheKey)val imageItem = Item(uri = myData.uri, path = myData.path)imageItem.type = Item.IMGval imageMemoryCacheKey = MemoryCache.Key(imageItem.toString())val imageMemoryCache = MyCoilManager.INSTANCE.getMemoryCache(imageMemoryCacheKey)if (thumbMemoryCache == null && imageMemoryCache == null) {setImageBitmap(mPlaceHolderBmp)}var highQuality = falseif (thumbMemoryCache == null) {val thumbReq = ImageRequest.Builder(mCtx!!).data(thumbItem).memoryCacheKey(thumbMemoryCacheKey).memoryCachePolicy(CachePolicy.WRITE_ONLY).size(MainActivity.THUMB_WIDTH, MainActivity.THUMB_HEIGHT).listener(object : ImageRequest.Listener {override fun onSuccess(request: ImageRequest, result: SuccessResult) {Log.d(TAG, "缩略图 onSuccess $thumbItem 缓存状态=${MyCoilManager.INSTANCE.calMemoryCache()}")if (!highQuality) {this@MyImgView.setImageBitmap(result.image.toBitmap())}}override fun onError(request: ImageRequest, result: ErrorResult) {Log.e(TAG, "缩略图 onError $thumbItem")if (!highQuality) {setImageBitmap(mThumbError)}}}).build()mThumbDisposable = mImageLoader?.enqueue(thumbReq)} else {Log.d(TAG, "命中缩略图缓存 $thumbItem 缓存状态=${MyCoilManager.INSTANCE.calMemoryCache()}")this@MyImgView.setImageBitmap(thumbMemoryCache.image.toBitmap())}if (imageMemoryCache == null) {val imageReq = ImageRequest.Builder(mCtx!!).data(myData.uri).memoryCacheKey(imageMemoryCacheKey).memoryCachePolicy(CachePolicy.WRITE_ONLY).size(MainActivity.IMAGE_SIZE).listener(object : ImageRequest.Listener {override fun onSuccess(request: ImageRequest, result: SuccessResult) {highQuality = truemThumbDisposable?.dispose()Log.d(TAG, "正图 onSuccess $imageItem 缓存状态=${MyCoilManager.INSTANCE.calMemoryCache()}")setImageBitmap(result.image.toBitmap())}override fun onError(request: ImageRequest, result: ErrorResult) {Log.e(TAG, "正图 onError $imageItem")setImageBitmap(mImageError)}}).build()mImageDisposable = mImageLoader?.enqueue(imageReq)} else {Log.d(TAG, "命中正图缓存 $imageItem 缓存状态=${MyCoilManager.INSTANCE.calMemoryCache()}")setImageBitmap(imageMemoryCache.image.toBitmap())}}override fun onDetachedFromWindow() {super.onDetachedFromWindow()//强化clear//clear()}private fun clear() {Log.d(TAG, "clear")mThumbDisposable?.dispose()mImageDisposable?.dispose()}override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {super.onMeasure(widthMeasureSpec, heightMeasureSpec)setMeasuredDimension(mHeight, 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)}}
}
遗留问题：对于一些异型、特殊视频，Coil3原生的解码有些情况。下一步打算单独做一个视频的解码module，像缩略图那种。
Android Coil3缩略图直接内存复用，Kotlin（6）_android kotlin coil-CSDN博客文章浏览阅读276次，点赞3次，收藏6次。遗留问题，配置的disk cache似乎没有work，指定的磁盘缓存文件路径生成是生成了，但是app跑起来运行后（图正常显示），里面是空的。遗留问题，配置的disk cache似乎没有work，指定的磁盘缓存文件路径生成是生成了，但是app跑起来运行后（图正常显示），里面是空的。遗留问题，配置的disk cache似乎没有work，指定的磁盘缓存文件路径生成是生成了，但是app跑起来运行后（图正常显示），里面是空的。2、现在分别使用缩略图内存缓存和正图内存缓存，感觉应该可以合并，只使用一套内存缓存。_android kotlin coilhttps://blog.csdn.net/zhangphil/article/details/146429297
