support audio files album icon preview

Author: Raival-e

app/src/main/java/com/raival/compose/file/explorer/App.kt

@@ -18,6 +18,7 @@ import coil3.request.crossfade
 import coil3.svg.SvgDecoder
 import coil3.video.VideoFrameDecoder
 import com.raival.compose.file.explorer.coil.apk.ApkFileDecoder
+import com.raival.compose.file.explorer.coil.audio.AudioFileDecoder
 import com.raival.compose.file.explorer.coil.pdf.PdfFileDecoder
 import com.raival.compose.file.explorer.common.FileExplorerLogger
 import com.raival.compose.file.explorer.screen.main.MainActivityManager
@@ -192,6 +193,7 @@ class App : Application(), coil3.SingletonImageLoader.Factory {
                 add(VideoFrameDecoder.Factory())
                 add(ApkFileDecoder.Factory())
                 add(PdfFileDecoder.Factory())
+                add(AudioFileDecoder.Factory())
             }
             .build()
     }

app/src/main/java/com/raival/compose/file/explorer/coil/audio/AudioFileDecoder.kt

@@ -0,0 +1,52 @@
+package com.raival.compose.file.explorer.coil.audio
+
+import android.graphics.BitmapFactory.decodeByteArray
+import android.media.MediaMetadataRetriever
+import coil3.ImageLoader
+import coil3.asImage
+import coil3.decode.DecodeResult
+import coil3.decode.Decoder
+import coil3.fetch.SourceFetchResult
+import coil3.request.Options
+import com.raival.compose.file.explorer.screen.main.tab.files.misc.FileMimeType.audioFileType
+import java.io.File
+
+class AudioFileDecoder(
+    private val source: File,
+) : Decoder {
+    override suspend fun decode(): DecodeResult? {
+        return try {
+            val metadata = MediaMetadataRetriever()
+            metadata.setDataSource(source.absolutePath)
+
+            val albumArt = metadata.embeddedPicture
+            metadata.release()
+
+            if (albumArt != null) {
+                val bitmap = decodeByteArray(albumArt, 0, albumArt.size)
+                if (bitmap != null) {
+                    DecodeResult(
+                        image = bitmap.asImage(),
+                        isSampled = false
+                    )
+                } else null
+            } else null
+        } catch (e: Exception) {
+            null
+        }
+    }
+
+    class Factory : Decoder.Factory {
+        override fun create(
+            result: SourceFetchResult,
+            options: Options,
+            imageLoader: ImageLoader
+        ): Decoder? {
+            val file = result.source.file().toFile()
+            if (file.exists() && audioFileType.contains(file.extension)) {
+                return AudioFileDecoder(file)
+            }
+            return null
+        }
+    }
+}

app/src/main/java/com/raival/compose/file/explorer/screen/main/tab/files/coil/Utils.kt

@@ -2,6 +2,7 @@ package com.raival.compose.file.explorer.screen.main.tab.files.coil
 
 import com.raival.compose.file.explorer.screen.main.tab.files.holder.ContentHolder
 import com.raival.compose.file.explorer.screen.main.tab.files.misc.FileMimeType.apkFileType
+import com.raival.compose.file.explorer.screen.main.tab.files.misc.FileMimeType.audioFileType
 import com.raival.compose.file.explorer.screen.main.tab.files.misc.FileMimeType.imageFileType
 import com.raival.compose.file.explorer.screen.main.tab.files.misc.FileMimeType.pdfFileType
 import com.raival.compose.file.explorer.screen.main.tab.files.misc.FileMimeType.videoFileType
@@ -10,6 +11,7 @@ fun canUseCoil(contentHolder: ContentHolder): Boolean {
     return (contentHolder.isFile()
             && imageFileType.contains(contentHolder.extension)
             || videoFileType.contains(contentHolder.extension)
+            || audioFileType.contains(contentHolder.extension)
             || contentHolder.extension == apkFileType
             || contentHolder.extension == pdfFileType
             )