Android: 通過URL下載檔案

URL url = new URL(urlString);File tempFile = null;tempFile = File.createTempFile("cache", ".tmp", new File(Environment.getExternalStorageDirectory().toString()));boolean downloaded = DownloadUtils.requestDownload(url, tempFile);public class DownloadUtils {    private static final String TAG = "DownloadService";    public static boolean requestDownload(URL url, File file) {        FileOutputStream fos = null;        try {            fos = new FileOutputStream(file);            return download(url, fos);        } catch (Throwable t) {            return false;        } finally {            Utils.closeSilently(fos);        }    }    public static void dump(InputStream is, OutputStream os)            throws IOException {        byte buffer[] = new byte[4096];        int rc = is.read(buffer, 0, buffer.length);        final Thread thread = Thread.currentThread();        while (rc > 0) {            os.write(buffer, 0, rc);            rc = is.read(buffer, 0, buffer.length);        }        Thread.interrupted(); // consume the interrupt signal    }    public static boolean download(URL url, OutputStream output) {        InputStream input = null;        try {            input = url.openStream();            dump(input, output);            return true;        } catch (Throwable t) {            Log.w(TAG, "fail to download", t);            return false;        } finally {            Utils.closeSilently(input);        }    }}