异常是由userAgent字符串在此处为null或长度为零引起的:
public DefaultHttpDataSource(String userAgent, Predicate<String> contentTypePredicate,
TransferListener<? super DefaultHttpDataSource> listener, int connectTimeoutMillis,
int readTimeoutMillis, boolean allowCrossProtocolRedirects,
RequestProperties defaultRequestProperties) {
this.userAgent = Assertions.checkNotEmpty(userAgent); <---- Exception is here
this.contentTypePredicate = contentTypePredicate;
this.listener = listener;
this.requestProperties = new RequestProperties();
this.connectTimeoutMillis = connectTimeoutMillis;
this.readTimeoutMillis = readTimeoutMillis;
this.allowCrossProtocolRedirects = allowCrossProtocolRedirects;
this.defaultRequestProperties = defaultRequestProperties;
}
/**
* Returns a user agent string based on the given application name and the library version.
*
* @param context A valid context of the calling application.
* @param applicationName String that will be prefix'ed to the generated user agent.
* @return A user agent string generated using the applicationName and the library version.
*/
public static String getUserAgent(Context context, String applicationName) {
String versionName;
try {
String packageName = context.getPackageName();
PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
versionName = info.versionName;
} catch (NameNotFoundException e) {
versionName = "?";
}
return applicationName + "/" + versionName + " (Linux;Android " + Build.VERSION.RELEASE
+ ") " + ExoPlayerLibraryInfo.VERSION_SLASHY;
}
您可以在演示应用程序中看到它的使用和设置示例:
https://github.com/google/ExoPlayer/tree/release-v2/demo
https://google.github.io/ExoPlayer/guide.html
)其中包括显示正在设置的userAgent的示例:
// Measures bandwidth during playback. Can be null if not required.
DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
// Produces DataSource instances through which media data is loaded.
DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(context,
Util.getUserAgent(context, "yourApplicationName"), bandwidthMeter);
// Produces Extractor instances for parsing the media data.
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
// This is the MediaSource representing the media to be played.
MediaSource videoSource = new ExtractorMediaSource(mp4VideoUri,
dataSourceFactory, extractorsFactory, null, null);
// Prepare the player with the source.
player.prepare(videoSource);
