我正在制作一个应用程序，如果我向您播放管视频并在我的应用程序中显示但我收到错误消息在检索视频时出现错误。我的代码片段如下：
public class Rads extends Activity {
public static final String SCHEME_YOUTUBE_VIDEO = "ytv";
public static final String SCHEME_YOUTUBE_PLAYLIST = "ytpl";
static final String YOUTUBE_VIDEO_INFORMATION_URL = "http://www.youtube.com/get_video_info?&video_id=";
static final String YOUTUBE_PLAYLIST_ATOM_FEED_URL = "http://gdata.youtube.com/feeds/api/playlists/";
protected ProgressBar mProgressBar;
protected TextView mProgressMessage;
protected VideoView mVideoView;
public final static String MSG_INIT = "com.keyes.video.msg.init";
protected String mMsgInit = "Initializing";
public final static String MSG_DETECT = "com.keyes.video.msg.detect";
protected String mMsgDetect = "Detecting Bandwidth";
public final static String MSG_PLAYLIST = "com.keyes.video.msg.playlist";
protected String mMsgPlaylist = "Determining Latest Video in YouTube Playlist";
public final static String MSG_TOKEN = "com.keyes.video.msg.token";
protected String mMsgToken = "Retrieving YouTube Video Token";
public final static String MSG_LO_BAND = "com.keyes.video.msg.loband";
protected String mMsgLowBand = "Buffering Low-bandwidth Video";
public final static String MSG_HI_BAND = "com.keyes.video.msg.hiband";
protected String mMsgHiBand = "Buffering High-bandwidth Video";
public final static String MSG_ERROR_TITLE = "com.keyes.video.msg.error.title";
protected String mMsgErrorTitle = "Communications Error";
public final static String MSG_ERROR_MSG = "com.keyes.video.msg.error.msg";
protected String mMsgError = "An error occurred during the retrieval of the video. This could be due to network issues or YouTube protocols. Please try again later.";
/** Background task on which all of the interaction with YouTube is done */
protected QueryYouTubeTask mQueryYouTubeTask;
protected String mVideoId = null;
@Override
protected void onCreate(Bundle pSavedInstanceState) {
super.onCreate(pSavedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
// create the layout of the view
setupView();
// determine the messages to be displayed as the view loads the video
extractMessages();
// set the flag to keep the screen ON so that the video can play without the screen being turned off
getWindow().setFlags(android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
mProgressBar.bringToFront();
mProgressBar.setVisibility(View.VISIBLE);
mProgressMessage.setText(mMsgInit);
// extract the playlist or video id from the intent that started this video
Uri lVideoIdUri = this.getIntent().getData();
if(lVideoIdUri == null){
Log.i(this.getClass().getSimpleName(), "No video ID was specified in the intent. Closing video activity.");
finish();
}
String lVideoSchemeStr = lVideoIdUri.getScheme();
String lVideoIdStr = lVideoIdUri.getEncodedSchemeSpecificPart();
if(lVideoIdStr == null){
Log.i(this.getClass().getSimpleName(), "No video ID was specified in the intent. Closing video activity.");
finish();
}
if(lVideoIdStr.startsWith("//")){
if(lVideoIdStr.length() > 2){
lVideoIdStr = lVideoIdStr.substring(2);
} else {
Log.i(this.getClass().getSimpleName(), "No video ID was specified in the intent. Closing video activity.");
finish();
}
}
///////////////////
// extract either a video id or a playlist id, depending on the uri scheme
YouTubeId lYouTubeId = null;
if(lVideoSchemeStr != null && lVideoSchemeStr.equalsIgnoreCase(SCHEME_YOUTUBE_PLAYLIST)){
lYouTubeId = new PlaylistId(lVideoIdStr);
}
else if(lVideoSchemeStr != null && lVideoSchemeStr.equalsIgnoreCase(SCHEME_YOUTUBE_VIDEO)){
lYouTubeId = new VideoId(lVideoIdStr);
}
if(lYouTubeId == null){
Log.i(this.getClass().getSimpleName(), "Unable to extract video ID from the intent. Closing video activity.");
finish();
}
mQueryYouTubeTask = (QueryYouTubeTask) new QueryYouTubeTask().execute(lYouTubeId);
}
/**
* Determine the messages to display during video load and initialization.
*/
private void extractMessages() {
Intent lInvokingIntent = getIntent();
String lMsgInit = lInvokingIntent.getStringExtra(MSG_INIT);
if(lMsgInit != null){
mMsgInit = lMsgInit;
}
String lMsgDetect = lInvokingIntent.getStringExtra(MSG_DETECT);
if(lMsgDetect != null){
mMsgDetect = lMsgDetect;
}
String lMsgPlaylist = lInvokingIntent.getStringExtra(MSG_PLAYLIST);
if(lMsgPlaylist != null){
mMsgPlaylist = lMsgPlaylist;
}
String lMsgToken = lInvokingIntent.getStringExtra(MSG_TOKEN);
if(lMsgToken != null){
mMsgToken = lMsgToken;
}
String lMsgLoBand = lInvokingIntent.getStringExtra(MSG_LO_BAND);
if(lMsgLoBand != null){
mMsgLowBand = lMsgLoBand;
}
String lMsgHiBand = lInvokingIntent.getStringExtra(MSG_HI_BAND);
if(lMsgHiBand != null){
mMsgHiBand = lMsgHiBand;
}
String lMsgErrTitle = lInvokingIntent.getStringExtra(MSG_ERROR_TITLE);
if(lMsgErrTitle != null){
mMsgErrorTitle = lMsgErrTitle;
}
String lMsgErrMsg = lInvokingIntent.getStringExtra(MSG_ERROR_MSG);
if(lMsgErrMsg != null){
mMsgError = lMsgErrMsg;
}
}
/**
* Create the view in which the video will be rendered.
*/
private void setupView() {
LinearLayout lLinLayout = new LinearLayout(this);
lLinLayout.setId(1);
lLinLayout.setOrientation(LinearLayout.VERTICAL);
lLinLayout.setGravity(Gravity.CENTER);
lLinLayout.setBackgroundColor(Color.BLACK);
LayoutParams lLinLayoutParms = new LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
lLinLayout.setLayoutParams(lLinLayoutParms);
this.setContentView(lLinLayout);
RelativeLayout lRelLayout = new RelativeLayout(this);
lRelLayout.setId(2);
lRelLayout.setGravity(Gravity.CENTER);
lRelLayout.setBackgroundColor(Color.BLACK);
android.widget.RelativeLayout.LayoutParams lRelLayoutParms = new android.widget.RelativeLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
lRelLayout.setLayoutParams(lRelLayoutParms);
lLinLayout.addView(lRelLayout);
mVideoView = new VideoView(this);
mVideoView.setId(3);
android.widget.RelativeLayout.LayoutParams lVidViewLayoutParams = new android.widget.RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lVidViewLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
mVideoView.setLayoutParams(lVidViewLayoutParams);
lRelLayout.addView(mVideoView);
mProgressBar = new ProgressBar(this);
mProgressBar.setIndeterminate(true);
mProgressBar.setVisibility(View.VISIBLE);
mProgressBar.setEnabled(true);
mProgressBar.setId(4);
android.widget.RelativeLayout.LayoutParams lProgressBarLayoutParms = new android.widget.RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lProgressBarLayoutParms.addRule(RelativeLayout.CENTER_IN_PARENT);
mProgressBar.setLayoutParams(lProgressBarLayoutParms);
lRelLayout.addView(mProgressBar);
mProgressMessage = new TextView(this);
mProgressMessage.setId(5);
android.widget.RelativeLayout.LayoutParams lProgressMsgLayoutParms = new android.widget.RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lProgressMsgLayoutParms.addRule(RelativeLayout.CENTER_HORIZONTAL);
lProgressMsgLayoutParms.addRule(RelativeLayout.BELOW, 4);
mProgressMessage.setLayoutParams(lProgressMsgLayoutParms);
mProgressMessage.setTextColor(Color.LTGRAY);
mProgressMessage.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12);
mProgressMessage.setText("...");
lRelLayout.addView(mProgressMessage);
}
@Override
protected void onDestroy() {
super.onDestroy();
YouTubeUtility.markVideoAsViewed(this, mVideoId);
if(mQueryYouTubeTask != null){
mQueryYouTubeTask.cancel(true);
}
if(mVideoView != null){
mVideoView.stopPlayback();
}
// clear the flag that keeps the screen ON
getWindow().clearFlags(android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
this.mQueryYouTubeTask = null;
this.mVideoView = null;
}
public void updateProgress(String pProgressMsg){
try {
mProgressMessage.setText(pProgressMsg);
} catch(Exception e) {
Log.e(this.getClass().getSimpleName(), "Error updating video status!", e);
}
}
private class ProgressUpdateInfo {
public String mMsg;
public ProgressUpdateInfo(String pMsg){
mMsg = pMsg;
}
}
/**
* Task to figure out details by calling out to YouTube GData API. We only use public methods that
* don't require authentication.
*
*/
private class QueryYouTubeTask extends AsyncTask<YouTubeId, ProgressUpdateInfo, Uri> {
private boolean mShowedError = false;
@Override
protected Uri doInBackground(YouTubeId... pParams) {
String lUriStr = null;
String lYouTubeFmtQuality = "17"; // 3gpp medium quality, which should be fast enough to view over EDGE connection
String lYouTubeVideoId = null;
if(isCancelled())
return null;
try {
publishProgress(new ProgressUpdateInfo(mMsgDetect));
WifiManager lWifiManager = (WifiManager) Rads.this.getSystemService(Context.WIFI_SERVICE);
TelephonyManager lTelephonyManager = (TelephonyManager) Rads.this.getSystemService(Context.TELEPHONY_SERVICE);
////////////////////////////
// if we have a fast connection (wifi or 3g), then we'll get a high quality YouTube video
if( (lWifiManager.isWifiEnabled() && lWifiManager.getConnectionInfo() != null && lWifiManager.getConnectionInfo().getIpAddress() != 0) ||
( (lTelephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS ||
/* icky... using literals to make backwards compatible with 1.5 and 1.6 */
lTelephonyManager.getNetworkType() == 9 /*HSUPA*/ ||
lTelephonyManager.getNetworkType() == 10 /*HSPA*/ ||
lTelephonyManager.getNetworkType() == 8 /*HSDPA*/ ||
lTelephonyManager.getNetworkType() == 5 /*EVDO_0*/ ||
lTelephonyManager.getNetworkType() == 6 /*EVDO A*/)
&& lTelephonyManager.getDataState() == TelephonyManager.DATA_CONNECTED)
){
lYouTubeFmtQuality = "18";
}
///////////////////////////////////
// if the intent is to show a playlist, get the latest video id from the playlist, otherwise the video
// id was explicitly declared.
if(pParams[0] instanceof PlaylistId){
publishProgress(new ProgressUpdateInfo(mMsgPlaylist));
lYouTubeVideoId = YouTubeUtility.queryLatestPlaylistVideo((PlaylistId) pParams[0]);
}
else if(pParams[0] instanceof VideoId){
lYouTubeVideoId = pParams[0].getId();
}
mVideoId = lYouTubeVideoId;
publishProgress(new ProgressUpdateInfo(mMsgToken));
if(isCancelled())
return null;
////////////////////////////////////
// calculate the actual URL of the video, encoded with proper YouTube token
lUriStr = YouTubeUtility.calculateYouTubeUrl(lYouTubeFmtQuality, true, lYouTubeVideoId);
if(isCancelled())
return null;
if(lYouTubeFmtQuality.equals("17")){
publishProgress(new ProgressUpdateInfo(mMsgLowBand));
} else {
publishProgress(new ProgressUpdateInfo(mMsgHiBand));
}
} catch(Exception e) {
Log.e(this.getClass().getSimpleName(), "Error occurred while retrieving information from YouTube.", e);
}
if(lUriStr != null){
return Uri.parse(lUriStr);
} else {
return null;
}
}
@Override
protected void onPostExecute(Uri pResult) {
super.onPostExecute(pResult);
try {
if(isCancelled())
return;
if(pResult == null){
throw new RuntimeException("Invalid NULL Url.");
}
mVideoView.setVideoURI(pResult);
if(isCancelled())
return;
// TODO: add listeners for finish of video
mVideoView.setOnCompletionListener(new OnCompletionListener(){
public void onCompletion(MediaPlayer pMp) {
if(isCancelled())
return;
Rads.this.finish();
}
});
if(isCancelled())
return;
final MediaController lMediaController = new MediaController(Rads.this);
mVideoView.setMediaController(lMediaController);
lMediaController.show(0);
//mVideoView.setKeepScreenOn(true);
mVideoView.setOnPreparedListener( new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer pMp) {
if(isCancelled())
return;
Rads.this.mProgressBar.setVisibility(View.GONE);
Rads.this.mProgressMessage.setVisibility(View.GONE);
}
});
if(isCancelled())
return;
mVideoView.requestFocus();
mVideoView.start();
} catch(Exception e){
Log.e(this.getClass().getSimpleName(), "Error playing video!", e);
if(!mShowedError){
showErrorAlert();
}
}
}
private void showErrorAlert() {
try {
Builder lBuilder = new AlertDialog.Builder(Rads.this);
lBuilder.setTitle(mMsgErrorTitle);
lBuilder.setCancelable(false);
lBuilder.setMessage(mMsgError);
lBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface pDialog, int pWhich) {
Rads.this.finish();
}
});
AlertDialog lDialog = lBuilder.create();
lDialog.show();
} catch(Exception e){
Log.e(this.getClass().getSimpleName(), "Problem showing error dialog.", e);
}
}
@Override
protected void onProgressUpdate(ProgressUpdateInfo... pValues) {
super.onProgressUpdate(pValues);
Rads.this.updateProgress(pValues[0].mMsg);
}
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onStop() {
super.onStop();
}
}