Use DownloaderCallback instead of DownloadService reference

src/de/danoeh/antennapod/service/download/DownloadService.java

@@ -308,7 +308,13 @@ public class DownloadService extends Service {
 
 	private Downloader getDownloader(DownloadStatus status) {
 		if (URLUtil.isHttpUrl(status.getFeedFile().getDownload_url())) {
-			return new HttpDownloader(this, status);
+			return new HttpDownloader(new DownloaderCallback() {
+				
+				@Override
+				public void onDownloadCompleted(Downloader downloader) {
+					DownloadService.this.onDownloadCompleted(downloader);
+				}
+			}, status);
 		}
 		Log.e(TAG, "Could not find appropriate downloader for "
 				+ status.getFeedFile().getDownload_url());

src/de/danoeh/antennapod/service/download/Downloader.java

@@ -8,7 +8,7 @@ import de.danoeh.antennapod.asynctask.DownloadStatus;
 public abstract class Downloader extends Thread {
 	private static final String TAG = "Downloader";
 	private Handler handler;
-	private DownloadService downloadService;
+	private DownloaderCallback downloaderCallback;
 
 	protected boolean finished;
 	
@@ -16,9 +16,9 @@ public abstract class Downloader extends Thread {
 
 	protected volatile DownloadStatus status;
 
-	public Downloader(DownloadService downloadService, DownloadStatus status) {
+	public Downloader(DownloaderCallback downloaderCallback, DownloadStatus status) {
 		super();
-		this.downloadService = downloadService;
+		this.downloaderCallback = downloaderCallback;
 		this.status = status;
 		this.status.setStatusMsg(R.string.download_pending);
 		this.cancelled = false;
@@ -36,7 +36,7 @@ public abstract class Downloader extends Thread {
 
 				@Override
 				public void run() {
-					downloadService.onDownloadCompleted(Downloader.this);
+					downloaderCallback.onDownloadCompleted(Downloader.this);
 				}
 
 			});

src/de/danoeh/antennapod/service/download/DownloaderCallback.java

@@ -0,0 +1,10 @@
+package de.danoeh.antennapod.service.download;
+
+/**
+ * Callback used by the Downloader-classes to notify the requester that the
+ * download has completed.
+ */
+public interface DownloaderCallback {
+
+	public void onDownloadCompleted(Downloader downloader);
+}

src/de/danoeh/antennapod/service/download/HttpDownloader.java

@@ -32,8 +32,8 @@ public class HttpDownloader extends Downloader {
 	private static final int BUFFER_SIZE = 8 * 1024;
 	private static final int CONNECTION_TIMEOUT = 5000;
 
-	public HttpDownloader(DownloadService downloadService, DownloadStatus status) {
-		super(downloadService, status);
+	public HttpDownloader(DownloaderCallback downloaderCallback, DownloadStatus status) {
+		super(downloaderCallback, status);
 	}
 
 	/**