Android MediaMetadataRetriever取视频封面，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>()//读取视频Videoval cursor = ctx.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(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，普通图。2，视频。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抽帧的耗时太长，对于异常或者超规格的视频，基本上10+秒。通常5、6秒。

500个超规格、残破视频，解码耗时和成功率情况：

android MMR: total fail item count=110

android MMR：total success item count=389

android MMR：total cost time= 198679 ms

3分钟+，500个视频才解码完，成功解码389个，解码失败110个。（0开始计数）

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