Android MediaMetadataRetriever取視頻封面，Kotlin（1）
<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" />
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@android:color/white"android:padding="1px"><ImageViewandroid:id="@+id/image"android:layout_width="match_parent"android:layout_height="180px"android:background="@android:color/darker_gray"android:scaleType="centerCrop" /></LinearLayout>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 kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launchclass MainActivity : AppCompatActivity() {companion object {const val TAG = "fly"const val SPAN_COUNT = 9const val VIDEO = 1}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val rv = findViewById<RecyclerView>(R.id.rv)val layoutManager = GridLayoutManager(this, SPAN_COUNT)layoutManager.orientation = GridLayoutManager.VERTICALrv.layoutManager = layoutManagerval adapter = MyAdapter(this)rv.adapter = adapterrv.layoutManager = layoutManagerval ctx = thislifecycleScope.launch(Dispatchers.IO) {val videoList = readAllVideo(ctx)Log.d(TAG, "readAllVideo size=${videoList.size}")val lists = arrayListOf<MyData>()lists.addAll(videoList)lifecycleScope.launch(Dispatchers.Main) {adapter.dataChanged(lists)}}}private fun readAllVideo(ctx: Context): ArrayList<MyData> {val videos = ArrayList<MyData>()//讀取視頻Videoval cursor = ctx.contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,null,null,null,null)while (cursor!!.moveToNext()) {//路徑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))//名稱//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(videoUri, path, VIDEO))}cursor.close()return videos}
}import android.content.Context
import android.graphics.Bitmap
import android.media.MediaMetadataRetriever
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import androidx.collection.LruCache
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.RecyclerView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContextclass MyAdapter : RecyclerView.Adapter<MyAdapter.VideoHolder> {private var mCtx: Context? = nullprivate var mItems = ArrayList<MyData>()private var mFailItemCount = 0private var mSuccessItemCount = 0private var mTotalCostTime = 0Lprivate val mCache = LruCache<String, Bitmap?>(1000)private var mIsDecoderCompleted = falseconstructor(ctx: Context) : super() {mCtx = ctx}fun dataChanged(items: ArrayList<MyData>) {this.mItems = itemsmSuccessItemCount = 0mTotalCostTime = 0mFailItemCount = 0notifyDataSetChanged()(mCtx as AppCompatActivity).lifecycleScope.launch(Dispatchers.IO) {mIsDecoderCompleted = falsemItems.forEachIndexed { idx, data ->var bmp: Bitmap? = mCache[data.toString()]if (bmp == null) {bmp = getSysMMRBmp(data)if (bmp != null) {mCache.put(data.toString(), bmp)}(mCtx as AppCompatActivity).lifecycleScope.launch(Dispatchers.Main) {notifyItemChanged(idx)}}}mIsDecoderCompleted = truewithContext(Dispatchers.Main) {notifyDataSetChanged()}}}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VideoHolder {val v = LayoutInflater.from(mCtx).inflate(R.layout.image_layout, null, false)return VideoHolder(v)}override fun onBindViewHolder(holder: VideoHolder, position: Int) {loadVideoCover(mItems[position], holder.image)}override fun getItemCount(): Int {return mItems.size}class VideoHolder : RecyclerView.ViewHolder {var image: ImageView? = nullconstructor(itemView: View) : super(itemView) {image = itemView.findViewById<ImageView>(R.id.image)image?.setImageResource(android.R.drawable.ic_menu_gallery)}}private fun getSysMMRBmp(data: MyData): Bitmap? {val sysMMR = MediaMetadataRetriever()var bmp: Bitmap? = nullval t = System.currentTimeMillis()try {sysMMR.setDataSource(data.path)bmp = sysMMR.frameAtTimemSuccessItemCount++Log.d(MainActivity.TAG,"android MMR：total success item count=$mSuccessItemCount")} catch (e: Exception) {Log.e(MainActivity.TAG, "android MMR: total fail item count=${mFailItemCount++} , ${e.message}:$data")} finally {try {sysMMR.release()sysMMR.close()} catch (exc: Exception) {Log.e(MainActivity.TAG, "$exc")}}val costTime = System.currentTimeMillis() - tmTotalCostTime = mTotalCostTime + costTimeLog.d(MainActivity.TAG, "android MMR：total cost time= $mTotalCostTime ms")return bmp}private fun loadVideoCover(data: MyData, image: ImageView?) {val bmp: Bitmap? = mCache[data.toString()]if (bmp != null) {image?.setImageBitmap(bmp)} else {if (mIsDecoderCompleted) {image?.setImageResource(android.R.drawable.stat_notify_error)}}}
}import android.net.Uriopen class MyData {var uri: Uri? = nullvar path: String? = nullvar lastModified = 0Lvar width = 0var height = 0var position = -1var type = -1 //-1未知。1，普通圖。2，視頻。constructor(uri: Uri?, path: String?, type: Int = -1) {this.uri = urithis.path = paththis.type = type}override fun toString(): String {return "MyData(uri=$uri, path=$path, lastModified=$lastModified, width=$width, height=$height, position=$position, type=$type)"}override fun equals(other: Any?): Boolean {return (this.toString()) == other.toString()}
}MediaMetadataRetriever抽幀的耗時太長，對于異常或者超規格的視頻，基本上10+秒。通常5、6秒。
500個超規格、殘破視頻，解碼耗時和成功率情況：
android MMR: total fail item count=110
android MMR：total success item count=389
android MMR：total cost time= 198679 ms
3分鐘+，500個視頻才解碼完，成功解碼389個，解碼失敗110個。（0開始計數）
Android MediaMetadataRetriever獲取視頻寬高，Java_retriever.extractmetadata-CSDN博客文章瀏覽閱讀1k次，點贊3次，收藏5次。文章瀏覽閱讀914次。【Android設置頭像，手機拍照或從本地相冊選取圖片作為頭像】像微信、QQ、微博等社交類的APP，通常都有設置頭像的功能，設置頭像通常有兩種方式：1，讓用戶通過選擇本地相冊之類的圖片庫中已有的圖像，裁剪后作為頭像。文章瀏覽閱讀124次。【Android設置頭像，手機拍照或從本地相冊選取圖片作為頭像】像微信、QQ、微博等社交類的APP，通常都有設置頭像的功能，設置頭像通常有兩種方式：1，讓用戶通過選擇本地相冊之類的圖片庫中已有的圖像，裁剪后作為頭像。_retriever.extractmetadatahttps://blog.csdn.net/zhangphil/article/details/139521977Android MediaMetadataRetriever setDataSource failed: status = 0xFFFFFFEA-CSDN博客文章瀏覽閱讀1.6k次。文章講述了在Android應用中使用Glide加載視頻時，遇到MediaMetadataRetriever的setDataSource拋出異常的情況，原因可能是視頻文件損壞或大小為0。作者介紹了如何自定義AppGlideModule來處理這種錯誤，例如通過添加模型篩選和容錯機制來改進加載邏輯。
https://blog.csdn.net/zhangphil/article/details/133890245
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