public class FileDownloadHelper {
    private static final String TAG = "FileDownloadHelper";
    /** 线程池 */
    private ThreadPool mPool = new ThreadPool();
    /** 开始下载 */
    public static final int MESSAGE_START = 0;
    /** 更新进度 */
    public static final int MESSAGE_PROGRESS = 1;
    /** 下载结束 */
    public static final int MESSAGE_STOP = 2;
    /** 下载出错 */
    public static final int MESSAGE_ERROR = 3;
    /** 中途终止 */
    private volatile boolean mIsStop = false;
    private Handler mHandler;
    public volatile HashMap<String, String> mDownloadUrls = new HashMap<String, String>();

    public FileDownloadHelper(Handler handler) {
        if (handler == null)
            throw new IllegalArgumentException("handler不能为空!");

        this.mHandler = handler;
    }

    public void stopALl() {
        mIsStop = true;
        mPool.stop();
    }

    public void newDownloadFile(final String url) {
        newDownloadFile(url, Environment.getExternalStorageDirectory() + "/" + FileUtils.getUrlFileName(url));
    }

    /**
     * 下载一个新的文件
     * 
     * @param url
     * @param savePath
     */
    public void newDownloadFile(final String url, final String savePath) {
        if (mDownloadUrls.containsKey(url))
            return;
        else
            mDownloadUrls.put(url, savePath);
        mPool.start(new Runnable() {

            @Override
            public void run() {
                mHandler.sendMessage(mHandler.obtainMessage(MESSAGE_START, url));
                HttpClient client = new DefaultHttpClient();
                HttpGet get = new HttpGet(url);
                InputStream inputStream = null;
                FileOutputStream outputStream = null;
                try {
                    HttpResponse response = client.execute(get);
                    HttpEntity entity = response.getEntity();
                    final int size = (int) entity.getContentLength();
                    inputStream = entity.getContent();
                    if (size > 0 && inputStream != null) {
                        outputStream = new FileOutputStream(savePath);
                        int ch = -1;
                        byte[] buf = new byte[1024];
                        //每秒更新一次进度
                        new Timer().schedule(new TimerTask() {

                            @Override
                            public void run() {
                                try {
                                    FileInputStream fis = new FileInputStream(new File(savePath));
                                    int downloadedSize = fis.available();
                                    if (downloadedSize >= size)
                                        cancel();
                                    mHandler.sendMessage(mHandler.obtainMessage(MESSAGE_PROGRESS, downloadedSize, size, url));
                                } catch (Exception e) {

                                }
                            }
                        }, 50, 1000);

                        while ((ch = inputStream.read(buf)) != -1 && !mIsStop) {
                            outputStream.write(buf, 0, ch);
                        }
                        outputStream.flush();
                    }
                } catch (Exception e) {
                    Log.e(TAG, e.getMessage(), e);
                    mHandler.sendMessage(mHandler.obtainMessage(MESSAGE_ERROR, url + ":" + e.getMessage()));
                } finally {
                    try {
                        if (outputStream != null)
                            outputStream.close();
                    } catch (IOException ex) {
                    }
                    try {
                        if (inputStream != null)
                            inputStream.close();
                    } catch (IOException ex) {
                    }
                }
                mDownloadUrls.remove(url);
                mHandler.sendMessage(mHandler.obtainMessage(MESSAGE_STOP, url));
            }
        });
    }

    public Handler mDownloadHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            PFile p;
            String url = msg.obj.toString();
            switch (msg.what) {
            case FileDownloadHelper.MESSAGE_START://开始下载
                p = new PFile();
                p.path = mParent.mFileDownload.mDownloadUrls.get(url);
                p.title = new File(p.path).getName();
                p.status = 0;
                p.file_size = 0;
                if (mDownloadAdapter == null) {
                    mDownloadAdapter = new FileAdapter(getActivity(), new ArrayList<PFile>());
                    mDownloadAdapter.add(p, url);
                    mTempListView.setAdapter(mDownloadAdapter);
                    mTempListView.setVisibility(View.VISIBLE);
                } else {
                    mDownloadAdapter.add(p, url);
                    mDownloadAdapter.notifyDataSetChanged();
                }
                break;
            case FileDownloadHelper.MESSAGE_PROGRESS://正在下载
                p = mDownloadAdapter.getItem(url);
                p.temp_file_size = msg.arg1;
                p.file_size = msg.arg2;
                int status = (int) ((msg.arg1 * 1.0 / msg.arg2) * 10);
                if (status > 10)
                    status = 10;
                p.status = status;
                mDownloadAdapter.notifyDataSetChanged();
                break;
            case FileDownloadHelper.MESSAGE_STOP://下载结束
                p = mDownloadAdapter.getItem(url);
                FileBusiness.insertFile(getActivity(), p);
                break;
            case FileDownloadHelper.MESSAGE_ERROR:
                Toast.makeText(getActivity(), url, Toast.LENGTH_LONG).show();
                break;
            }
            super.handleMessage(msg);
        }

                if (FileUtils.isVideoOrAudio(url)) {
                    Dialog dialog = new AlertDialog.Builder(getActivity()).setIcon(android.R.drawable.btn_star).setTitle("播放/下载").setMessage(url).setPositiveButton("播放", new OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent intent = new Intent(getActivity(), VideoPlayerActivity.class);
                            intent.putExtra("path", url);
                            startActivity(intent);
                        }
                    }).setNeutralButton("下载", new OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            MainFragmentActivity activity = (MainFragmentActivity) getActivity();
                            activity.mFileDownload.newDownloadFile(url);
                            Toast.makeText(getActivity(), "正在下载 .." + FileUtils.getUrlFileName(url) + " ，可从本地视频查看进度！", Toast.LENGTH_LONG).show();
                        }
                    }).setNegativeButton("取消", null).create();
                    dialog.show();
                    return true;