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package de.danoeh.antennapod.activity;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import de.danoeh.antennapod.AppConfig;
import de.danoeh.antennapod.R;
import de.danoeh.antennapod.asynctask.DownloadStatus;
import de.danoeh.antennapod.feed.Feed;
import de.danoeh.antennapod.preferences.UserPreferences;
import de.danoeh.antennapod.service.download.Downloader;
import de.danoeh.antennapod.service.download.DownloaderCallback;
import de.danoeh.antennapod.service.download.HttpDownloader;
import de.danoeh.antennapod.syndication.handler.FeedHandler;
import de.danoeh.antennapod.syndication.handler.UnsupportedFeedtypeException;
import de.danoeh.antennapod.util.DownloadError;
import de.danoeh.antennapod.util.FileNameGenerator;
import de.danoeh.antennapod.util.StorageUtils;
import de.danoeh.antennapod.util.URLChecker;
/**
* Downloads a feed from a feed URL and parses it. Subclasses can display the
* feed object that was parsed. This activity MUST be started with a given URL
* or an Exception will be thrown.
*
* If the feed cannot be downloaded or parsed, an error dialog will be displayed
* and the activity will finish as soon as the error dialog is closed.
*/
public abstract class OnlineFeedViewActivity extends SherlockFragmentActivity {
private static final String TAG = "OnlineFeedViewActivity";
private static final String ARG_FEEDURL = "arg.feedurl";
public static final int RESULT_ERROR = 2;
private Feed feed;
private Downloader downloader;
@Override
protected void onCreate(Bundle arg0) {
setTheme(UserPreferences.getTheme());
super.onCreate(arg0);
StorageUtils.checkStorageAvailability(this);
final String feedUrl = getIntent().getStringExtra(ARG_FEEDURL);
if (feedUrl == null) {
throw new IllegalArgumentException(
"Activity must be started with feedurl argument!");
}
if (AppConfig.DEBUG)
Log.d(TAG, "Activity was started with url " + feedUrl);
setLoadingLayout();
startFeedDownload(feedUrl);
}
@Override
protected void onStop() {
super.onStop();
if (downloader != null && downloader.getStatus().isDone() == false) {
downloader.cancel();
}
}
private DownloaderCallback downloaderCallback = new DownloaderCallback() {
@Override
public void onDownloadCompleted(final Downloader downloader) {
runOnUiThread(new Runnable() {
@Override
public void run() {
DownloadStatus status = downloader.getStatus();
if (status != null) {
if (!status.isCancelled()) {
if (status.isSuccessful()) {
parseFeed();
} else {
String errorMsg = DownloadError.getErrorString(
OnlineFeedViewActivity.this,
status.getReason());
if (errorMsg != null
&& status.getReasonDetailed() != null) {
errorMsg += " ("
+ status.getReasonDetailed() + ")";
}
showErrorDialog(errorMsg);
}
}
} else {
Log.wtf(TAG,
"DownloadStatus returned by Downloader was null");
finish();
}
}
});
}
};
private void startFeedDownload(String url) {
if (AppConfig.DEBUG)
Log.d(TAG, "Starting feed download");
url = URLChecker.prepareURL(url);
feed = new Feed(url, new Date());
String fileUrl = new File(getExternalCacheDir(),
FileNameGenerator.generateFileName(feed.getDownload_url()))
.toString();
feed.setFile_url(fileUrl);
DownloadStatus status = new DownloadStatus(feed, "OnlineFeed");
HttpDownloader httpDownloader = new HttpDownloader(downloaderCallback,
status);
httpDownloader.start();
}
/** Displays a progress indicator. */
private void setLoadingLayout() {
LinearLayout ll = new LinearLayout(this);
LinearLayout.LayoutParams llLayoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
ProgressBar pb = new ProgressBar(this);
pb.setIndeterminate(true);
LinearLayout.LayoutParams pbLayoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
pbLayoutParams.gravity = Gravity.CENTER;
ll.addView(pb, pbLayoutParams);
addContentView(ll, llLayoutParams);
}
private void parseFeed() {
if (feed == null || feed.getFile_url() == null) {
throw new IllegalStateException(
"feed must be non-null and downloaded when parseFeed is called");
}
if (AppConfig.DEBUG)
Log.d(TAG, "Parsing feed");
Thread thread = new Thread() {
@Override
public void run() {
String reasonDetailed = new String();
boolean successful = false;
FeedHandler handler = new FeedHandler();
try {
handler.parseFeed(feed);
successful = true;
} catch (SAXException e) {
e.printStackTrace();
reasonDetailed = e.getMessage();
} catch (IOException e) {
e.printStackTrace();
reasonDetailed = e.getMessage();
} catch (ParserConfigurationException e) {
e.printStackTrace();
reasonDetailed = e.getMessage();
} catch (UnsupportedFeedtypeException e) {
e.printStackTrace();
reasonDetailed = e.getMessage();
} finally {
boolean rc = new File(feed.getFile_url()).delete();
if (AppConfig.DEBUG)
Log.d(TAG, "Deleted feed source file. Result: " + rc);
}
if (successful) {
runOnUiThread(new Runnable() {
@Override
public void run() {
showFeedInformation();
}
});
} else {
final String errorMsg = DownloadError.getErrorString(
OnlineFeedViewActivity.this,
DownloadError.ERROR_PARSER_EXCEPTION)
+ " (" + reasonDetailed + ")";
runOnUiThread(new Runnable() {
@Override
public void run() {
showErrorDialog(errorMsg);
}
});
}
}
};
thread.start();
}
/** Called when feed parsed successfully */
protected void showFeedInformation() {
}
private void showErrorDialog(String errorMsg) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.error_label);
if (errorMsg != null) {
builder.setMessage(getString(R.string.error_msg_prefix) + errorMsg);
} else {
builder.setMessage(R.string.error_msg_prefix);
}
builder.setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
setResult(RESULT_ERROR);
finish();
}
});
}
}
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