Embedded GigaGet download manager. First try.

app/src/main/java/us/shandian/giga/get/DownloadRunnableFallback.java

@@ -0,0 +1,74 @@
+package us.shandian.giga.get;
+
+import java.io.BufferedInputStream;
+import java.io.RandomAccessFile;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+// Single-threaded fallback mode
+public class DownloadRunnableFallback implements Runnable
+{
+	private DownloadMission mMission;
+	//private int mId;
+	
+	public DownloadRunnableFallback(DownloadMission mission) {
+		//mId = id;
+		mMission = mission;
+	}
+
+	@Override
+	public void run() {
+		try {
+			URL url = new URL(mMission.url);
+			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+			
+			if (conn.getResponseCode() != 200 && conn.getResponseCode() != 206) {
+				notifyError(DownloadMission.ERROR_SERVER_UNSUPPORTED);
+			} else {
+				RandomAccessFile f = new RandomAccessFile(mMission.location + "/" + mMission.name, "rw");
+				f.seek(0);
+				BufferedInputStream ipt = new BufferedInputStream(conn.getInputStream());
+				byte[] buf = new byte[512];
+				int len = 0;
+				
+				while ((len = ipt.read(buf, 0, 512)) != -1 && mMission.running) {
+					f.write(buf, 0, len);
+					notifyProgress(len);
+					
+					if (Thread.currentThread().interrupted()) {
+						break;
+					}
+					
+				}
+				
+				f.close();
+				ipt.close();
+			}
+		} catch (Exception e) {
+			notifyError(DownloadMission.ERROR_UNKNOWN);
+		}
+		
+		if (mMission.errCode == -1 && mMission.running) {
+			notifyFinished();
+		}
+	}
+	
+	private void notifyProgress(final long len) {
+		synchronized (mMission) {
+			mMission.notifyProgress(len);
+		}
+	}
+	
+	private void notifyError(final int err) {
+		synchronized (mMission) {
+			mMission.notifyError(err);
+			mMission.pause();
+		}
+	}
+
+	private void notifyFinished() {
+		synchronized (mMission) {
+			mMission.notifyFinished();
+		}
+	}
+}