android 版本跟新之下载

public class DownloadUtil {    public static final int DOWNLOAD_FAIL=0;    public static final int DOWNLOAD_PROGRESS=1;    public static final int DOWNLOAD_SUCCESS=2;    private static DownloadUtil downloadUtil;    private final OkHttpClient okHttpClient;    public static DownloadUtil getInstance() {        if (downloadUtil == null) {            downloadUtil = new DownloadUtil();        }        return downloadUtil;    }    private DownloadUtil() {        okHttpClient = new OkHttpClient();    }    /**     *     */    public void download(final String url,final String saveDir,final OnDownloadListener listener){        this.listener=listener;        Request request=new Request.Builder().url(url).build();        okHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                Message message=Message.obtain();                message.what=DOWNLOAD_FAIL;                mHandler.sendMessage(message);            }            @Override            public void onResponse(Call call, Response response) throws IOException {                InputStream is=null;                byte[] buf=new byte[2048];                int len=0;                FileOutputStream fos=null;                //储存下载文件的目录                String savePath=isExistDir(saveDir);                File file=new File(savePath,getNameFromUrl(url));                if (file.exists()){                    file.delete();                }                try{                    is=response.body().byteStream();                    long total=response.body().contentLength();                    File file2=new File(savePath,getNameFromUrl(url));                    fos=new FileOutputStream(file2);                    long sum=0;                    while((len = is.read(buf))!=-1){                        fos.write(buf,0,len);                        sum+=len;                        int progress=(int)(sum*100/total);                        //下载中                        Message message=Message.obtain();                        message.what=DOWNLOAD_PROGRESS;                        message.obj=progress;                        mHandler.sendMessage(message);                    }                    fos.flush();                    //下载完成                    Message message=Message.obtain();                    message.what=DOWNLOAD_SUCCESS;                    message.obj=file.getAbsolutePath();                    mHandler.sendMessage(message);                }catch (Exception e){                    Message message=Message.obtain();                    message.what=DOWNLOAD_FAIL;                    mHandler.sendMessage(message);                }finally{                    try{                        if(is!=null)                            is.close();                    }catch (IOException e){                    }                    try {                        if(fos!=null){                            fos.close();                        }                    }catch (IOException e){                    }                }            }        });    }    private String getNameFromUrl(String url) {        return url.substring(url.lastIndexOf("/")+1);    }    private String isExistDir(String saveDir) throws IOException {        File downloadFile=new File(saveDir);        if(!downloadFile.mkdirs()){            downloadFile.createNewFile();        }        String savePath=downloadFile.getAbsolutePath();        return savePath;    }    private Handler mHandler=new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what){                case DOWNLOAD_PROGRESS:                    listener.onDownloading((Integer) msg.obj);                    break;                case DOWNLOAD_FAIL:                    listener.onDownloadFailed();                    break;                case DOWNLOAD_SUCCESS:                    listener.onDownloadSuccess((String) msg.obj);                    break;            }        }    };    OnDownloadListener listener;    public interface OnDownloadListener{        /**         * 下载成功         */        void onDownloadSuccess(String path);        /**         * 下载进度         * @param progress         */        void onDownloading(int progress);        /**         * 下载失败         */        void onDownloadFailed();    }}
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