Implemented OnlineFeedViewActivity
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daniel oeh
parent
7fe0e05304
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8bab080a5a
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package de.danoeh.antennapod.activity;
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import java.io.File;
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import java.io.IOException;
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import java.util.Date;
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import javax.xml.parsers.ParserConfigurationException;
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import org.xml.sax.SAXException;
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import android.app.AlertDialog;
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import android.content.DialogInterface;
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import android.content.DialogInterface.OnCancelListener;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.Gravity;
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import android.widget.LinearLayout;
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import android.widget.ProgressBar;
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import com.actionbarsherlock.app.SherlockFragmentActivity;
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import de.danoeh.antennapod.AppConfig;
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import de.danoeh.antennapod.R;
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import de.danoeh.antennapod.asynctask.DownloadStatus;
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import de.danoeh.antennapod.feed.Feed;
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import de.danoeh.antennapod.preferences.UserPreferences;
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import de.danoeh.antennapod.service.download.Downloader;
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import de.danoeh.antennapod.service.download.DownloaderCallback;
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import de.danoeh.antennapod.service.download.HttpDownloader;
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import de.danoeh.antennapod.syndication.handler.FeedHandler;
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import de.danoeh.antennapod.syndication.handler.UnsupportedFeedtypeException;
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import de.danoeh.antennapod.util.DownloadError;
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import de.danoeh.antennapod.util.FileNameGenerator;
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import de.danoeh.antennapod.util.StorageUtils;
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import de.danoeh.antennapod.util.URLChecker;
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/**
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* Downloads a feed from a feed URL and parses it. Subclasses can display the
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* feed object that was parsed. This activity MUST be started with a given URL
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* or an Exception will be thrown.
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*
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* If the feed cannot be downloaded or parsed, an error dialog will be displayed
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* and the activity will finish as soon as the error dialog is closed.
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*/
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public abstract class OnlineFeedViewActivity extends SherlockFragmentActivity {
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private static final String TAG = "OnlineFeedViewActivity";
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private static final String ARG_FEEDURL = "arg.feedurl";
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public static final int RESULT_ERROR = 2;
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private Feed feed;
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private Downloader downloader;
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@Override
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protected void onCreate(Bundle arg0) {
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setTheme(UserPreferences.getTheme());
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super.onCreate(arg0);
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StorageUtils.checkStorageAvailability(this);
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final String feedUrl = getIntent().getStringExtra(ARG_FEEDURL);
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if (feedUrl == null) {
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throw new IllegalArgumentException(
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"Activity must be started with feedurl argument!");
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}
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if (AppConfig.DEBUG)
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Log.d(TAG, "Activity was started with url " + feedUrl);
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setLoadingLayout();
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startFeedDownload(feedUrl);
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}
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@Override
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protected void onStop() {
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super.onStop();
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if (downloader != null && downloader.getStatus().isDone() == false) {
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downloader.cancel();
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}
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}
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private DownloaderCallback downloaderCallback = new DownloaderCallback() {
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@Override
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public void onDownloadCompleted(final Downloader downloader) {
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runOnUiThread(new Runnable() {
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@Override
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public void run() {
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DownloadStatus status = downloader.getStatus();
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if (status != null) {
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if (!status.isCancelled()) {
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if (status.isSuccessful()) {
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parseFeed();
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} else {
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String errorMsg = DownloadError.getErrorString(
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OnlineFeedViewActivity.this,
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status.getReason());
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if (errorMsg != null
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&& status.getReasonDetailed() != null) {
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errorMsg += " ("
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+ status.getReasonDetailed() + ")";
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}
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showErrorDialog(errorMsg);
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}
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}
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} else {
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Log.wtf(TAG,
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"DownloadStatus returned by Downloader was null");
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finish();
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}
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}
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});
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}
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};
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private void startFeedDownload(String url) {
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if (AppConfig.DEBUG)
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Log.d(TAG, "Starting feed download");
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url = URLChecker.prepareURL(url);
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feed = new Feed(url, new Date());
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String fileUrl = new File(getExternalCacheDir(),
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FileNameGenerator.generateFileName(feed.getDownload_url()))
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.toString();
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feed.setFile_url(fileUrl);
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DownloadStatus status = new DownloadStatus(feed, "OnlineFeed");
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HttpDownloader httpDownloader = new HttpDownloader(downloaderCallback,
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status);
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httpDownloader.start();
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}
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/** Displays a progress indicator. */
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private void setLoadingLayout() {
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LinearLayout ll = new LinearLayout(this);
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LinearLayout.LayoutParams llLayoutParams = new LinearLayout.LayoutParams(
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LinearLayout.LayoutParams.MATCH_PARENT,
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LinearLayout.LayoutParams.MATCH_PARENT);
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ProgressBar pb = new ProgressBar(this);
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pb.setIndeterminate(true);
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LinearLayout.LayoutParams pbLayoutParams = new LinearLayout.LayoutParams(
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LinearLayout.LayoutParams.WRAP_CONTENT,
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LinearLayout.LayoutParams.WRAP_CONTENT);
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pbLayoutParams.gravity = Gravity.CENTER;
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ll.addView(pb, pbLayoutParams);
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addContentView(ll, llLayoutParams);
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}
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private void parseFeed() {
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if (feed == null || feed.getFile_url() == null) {
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throw new IllegalStateException(
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"feed must be non-null and downloaded when parseFeed is called");
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}
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if (AppConfig.DEBUG)
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Log.d(TAG, "Parsing feed");
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Thread thread = new Thread() {
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@Override
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public void run() {
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String reasonDetailed = new String();
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boolean successful = false;
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FeedHandler handler = new FeedHandler();
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try {
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handler.parseFeed(feed);
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successful = true;
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} catch (SAXException e) {
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e.printStackTrace();
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reasonDetailed = e.getMessage();
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} catch (IOException e) {
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e.printStackTrace();
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reasonDetailed = e.getMessage();
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} catch (ParserConfigurationException e) {
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e.printStackTrace();
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reasonDetailed = e.getMessage();
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} catch (UnsupportedFeedtypeException e) {
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e.printStackTrace();
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reasonDetailed = e.getMessage();
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} finally {
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boolean rc = new File(feed.getFile_url()).delete();
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if (AppConfig.DEBUG)
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Log.d(TAG, "Deleted feed source file. Result: " + rc);
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}
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if (successful) {
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runOnUiThread(new Runnable() {
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@Override
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public void run() {
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showFeedInformation();
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}
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});
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} else {
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final String errorMsg = DownloadError.getErrorString(
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OnlineFeedViewActivity.this,
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DownloadError.ERROR_PARSER_EXCEPTION)
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+ " (" + reasonDetailed + ")";
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runOnUiThread(new Runnable() {
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@Override
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public void run() {
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showErrorDialog(errorMsg);
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}
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});
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}
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}
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};
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thread.start();
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}
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/** Called when feed parsed successfully */
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protected void showFeedInformation() {
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}
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private void showErrorDialog(String errorMsg) {
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AlertDialog.Builder builder = new AlertDialog.Builder(this);
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builder.setTitle(R.string.error_label);
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if (errorMsg != null) {
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builder.setMessage(getString(R.string.error_msg_prefix) + errorMsg);
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} else {
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builder.setMessage(R.string.error_msg_prefix);
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}
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builder.setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
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@Override
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public void onClick(DialogInterface dialog, int which) {
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dialog.cancel();
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}
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});
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builder.setOnCancelListener(new OnCancelListener() {
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@Override
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public void onCancel(DialogInterface dialog) {
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setResult(RESULT_ERROR);
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finish();
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}
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});
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}
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}
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