Question

我们正在通过申请在屏幕上展示一个电子共和国档案。该档案在SDCard得到保存,而且我们利用以下逻辑从SDCard获得档案数据并在筛选中显示。但需要很长时间才能将内容装在屏幕上。与我的法典有任何问题? 请帮助我的朋友。

 File rootDir = Environment.getExternalStorageDirectory();
   EpubReader epubReader = new EpubReader();
   try {
        book = epubReader.readEpub(new FileInputStream("/sdcard/forbook.epub"));
        Toast.makeText(getApplicationContext(), "Book : " + book, Toast.LENGTH_LONG).show();
    } catch (FileNotFoundException e) {
        Toast.makeText(getApplicationContext(), "File Not Found" + book, Toast.LENGTH_LONG).show();
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        Toast.makeText(getApplicationContext(), "IO Found" + book, Toast.LENGTH_LONG).show();
        e.printStackTrace();
    }
   Spine spine = book.getSpine(); 
   List<SpineReference> spineList = spine.getSpineReferences() ;
   int count = spineList.size();
   StringBuilder string = new StringBuilder();
   String linez = null;
    for (int i = 0; count > i; i++) {
       Resource res = spine.getResource(i);

       try {
           InputStream is = res.getInputStream();
           BufferedReader reader = new BufferedReader(new InputStreamReader(is));
           try {
               String line;
            while ((line = reader.readLine()) != null) {
                   linez =   string.append(line + "
").toString();
                    //linez=line.toString();
               }

           } catch (IOException e) {e.printStackTrace();}

           //do something with stream
       } catch (IOException e) {
           e.printStackTrace();
       }

   }
  final String mimeType = "text/html";
  final String encoding = "UTF-8";
  webView.loadDataWithBaseURL("", linez, mimeType, encoding,null);

}

请帮助我的朋友。

Answer 1

ePub基本上只不过是一个在内部拥有若干超文本档案的齐普文档。这本书的每章/部分通常都有一个档案(资源)。

What you re doing right now is looping through the spine of the book, loading all the resources when you can probably display 1 at most on the screen at a time.

我只建议装上你想要显示的资源,这应当大大加快负荷时间。

Answer 2

首先,你没有正确使用<代码>StringBuilder——这在你的代码中是毫无用处的。第二,决定你是否真的需要宽松的试捕区。第三,界定地方变量。关于所有这一切,我照此重写了你的法典:

    StringBuilder string = new StringBuilder();
    Resource res;
    InputStream is;
    BufferedReader reader;
    String line;
    for (int i = 0; count > i; i++) {
        res = spine.getResource(i);
        try {
            is = res.getInputStream();
            reader = new BufferedReader(new InputStreamReader(is));
            while ((line = reader.readLine()) != null) {
                string.append(line + "
");
            }

            // do something with stream
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    ...
    webView.loadDataWithBaseURL("", string.toString(), mimeType, encoding, null);

However, I suppose, this wouldn t drastically reduce the time needed to load your content, so I d recommend you to use Traceview to find the bottleneck in your code and to use AsyncTask for time-consuming operations.

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