Android 文件下载三种基本方式

　　private void downloadFile3(){

　　//下载路径，如果路径无效了，可换成你的下载路径

　　final String url = "http://c.qijingonline.com/test.mkv";

　　final long startTime = System.currentTimeMillis();

　　Log.i("DOWNLOAD","startTime="+startTime);

　　Request request = new Request.Builder().url(url).build();

　　new OkHttpClient().newCall(request).enqueue(new Callback() {

　　@Override

　　public void onFailure(Call call, IOException e) {

　　// 下载失败

　　e.printStackTrace();

　　Log.i("DOWNLOAD","download failed");

　　}

　　@Override

　　public void onResponse(Call call, Response response) throws IOException {

　　Sink sink = null;

　　BufferedSink bufferedSink = null;

　　try {

　　String mSDCardPath= Environment.getExternalStorageDirectory().getAbsolutePath();

　　File dest = new File(mSDCardPath, url.substring(url.lastIndexOf("/") + 1));

　　sink = Okio.sink(dest);

　　bufferedSink = Okio.buffer(sink);

　　bufferedSink.writeAll(response.body().source());

　　bufferedSink.close();

　　Log.i("DOWNLOAD","download success");

　　Log.i("DOWNLOAD","totalTime="+ (System.currentTimeMillis() - startTime));

　　} catch (Exception e) {

　　e.printStackTrace();

　　Log.i("DOWNLOAD","download failed");

　　} finally {

　　if(bufferedSink != null){

　　bufferedSink.close();

　　}

　　}

　　}

　　});

　　}