删除由exo player下载服务下载的文件

以下是一个示例代码，展示如何使用ExoPlayer删除由其下载服务下载的文件：

import android.content.Context;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.text.TextUtils;
import android.util.Log;

import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.DefaultLoadControl;
import com.google.android.exoplayer2.DefaultRenderersFactory;
import com.google.android.exoplayer2.ExoPlayer;
import com.google.android.exoplayer2.ExoPlayerFactory;
import com.google.android.exoplayer2.LoadControl;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
import com.google.android.exoplayer2.source.ExtractorMediaSource;
import com.google.android.exoplayer2.source.MediaSource;
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
import com.google.android.exoplayer2.trackselection.TrackSelector;
import com.google.android.exoplayer2.upstream.DataSource;
import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
import com.google.android.exoplayer2.upstream.cache.Cache;
import com.google.android.exoplayer2.upstream.cache.CacheDataSource;
import com.google.android.exoplayer2.upstream.cache.CacheDataSourceFactory;
import com.google.android.exoplayer2.upstream.cache.CacheEvictor;
import com.google.android.exoplayer2.upstream.cache.SimpleCache;
import com.google.android.exoplayer2.util.Util;

import java.io.File;

public class ExoPlayerDownloadUtils {

    private static final String TAG = "ExoPlayerDownloadUtils";
    private static final String DOWNLOAD_CONTENT_DIRECTORY = "downloads";
    private static final String CACHE_SUBDIRECTORY = "exoplayer";

    private static ExoPlayerDownloadUtils instance;
    private Cache downloadCache;
    private DataSource.Factory dataSourceFactory;

    private ExoPlayerDownloadUtils(Context context) {
        // 创建缓存目录
        File downloadDirectory = new File(context.getExternalFilesDir(null), DOWNLOAD_CONTENT_DIRECTORY);
        if (!downloadDirectory.exists()) {
            downloadDirectory.mkdirs();
        }
        // 创建缓存对象
        downloadCache = new SimpleCache(new File(downloadDirectory, CACHE_SUBDIRECTORY), new CacheEvictor() {
            @Override
            public void onCacheInitialized() {

            }

            @Override
            public void onStartFile(File file, long position, long length) {

            }

            @Override
            public void onSpanAdded(Cache cache, CacheSpan span) {

            }

            @Override
            public void onSpanRemoved(Cache cache, CacheSpan span) {

            }

            @Override
            public void onSpanTouched(Cache cache, CacheSpan oldSpan, CacheSpan newSpan) {

            }

            @Override
            public void onSpanMoved(Cache cache, CacheSpan oldSpan, CacheSpan newSpan) {

            }

            @Override
            public void onCacheSpanRemoved(Cache cache, CacheSpan span) {

            }
        });
        // 创建数据源工厂
        dataSourceFactory = new CacheDataSourceFactory(downloadCache, new DefaultDataSourceFactory(context,
                Util.getUserAgent(context, "ExoPlayerDownloadUtils")), CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR);
    }

    public static ExoPlayerDownloadUtils getInstance(Context context) {
        if (instance == null) {
            instance = new ExoPlayerDownloadUtils(context.getApplicationContext());
        }
        return instance;
    }

    public void deleteDownloadedFile(Context context, String downloadUrl) {
        if (TextUtils.isEmpty(downloadUrl)) {
            return;
        }
        // 创建播放器
        TrackSelector trackSelector = new DefaultTrackSelector();
        LoadControl loadControl = new DefaultLoadControl();
        SimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(new DefaultRenderersFactory(context), trackSelector, loadControl);
        // 创建媒体源
        Uri uri = Uri.parse(downloadUrl);
        MediaSource mediaSource = new ExtractorMediaSource(uri, dataSourceFactory, new DefaultExtractorsFactory(), null, null);
        // 准备播放器
        player.prepare(mediaSource);
        // 删除缓存文件
        CacheUtil.remove(cache, CacheUtil.generateKey(uri));
        // 释放播放器资源
        player.release();
    }

}

使用方法：

ExoPlayerDownloadUtils.getInstance(context).deleteDownloadedFile(context, downloadUrl);

其中，context是应用的上下文，downloadUrl是要删除的下载文件的URL。请确保在调用此方法之前已经完成了文件的下载。