mCurrentWebView.setDownloadListener(new DownloadListener() {    @Override    public void onDownloadStart(final String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {    　　// TODO 实现下载逻辑        Log.e("onDownloadStart", "url===" + url + "---userAgent=" + userAgent + "---contentDisposition=" + contentDisposition + "---mimetype=" + mimetype + "---contentLength=" + contentLength);　　}});

HttpParams params = new BasicHttpParams();HttpConnectionParams.setConnectionTimeout(params, 5 * 1000);HttpConnectionParams.setSoTimeout(params, 5 * 1000);HttpGet httpGet = new HttpGet(url);try {    File file = new File(Environment.getExternalStorageDirectory(), fileName);    if (!file.exists()) {        file.createNewFile();    } else {　　　　 boolean flag = file.delete();　　　　 if (flag) {        　　file.createNewFile();　　　　 } else {　　　　 　　return;　　　　 } 　　}    RandomAccessFile randomFile = new RandomAccessFile(file, "rw");        HttpResponse response = new DefaultHttpClient(params).execute(httpGet);    HttpEntity entity = response.getEntity();        InputStream in = entity.getContent();    randomFile.seek(randomFile.length());        byte[] buffer = new byte[1024];    int lenght = 0;    while ((lenght = in.read(buffer)) > 0) {        randomFile.write(buffer, 0, lenght);        DebugTraceTool.debugTraceE(this, "file length == " + randomFile.length());    }    randomFile.close();    httpGet.abort();    } catch (Exception e) {    e.printStackTrace();}