从项目的原始文件夹中读取 .pdf

Posted 2023-03-07

【中文标题】从项目的原始文件夹中读取 .pdf

【英文标题】：Reading .pdf from raw folder in project

【发布时间】：2014-08-28 05:04:17

【问题描述】：

我正在尝试从我的资产文件夹中读取 .pdf 文件，错误显示“无法打开此文档”。我尝试将 .pdf 文件复制到 sd 卡，然后从那里读取，但没有成功。这是代码。请帮帮我。

protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    File fileBrochure = new File("/sdcard/fleetman.pdf");
    if (!fileBrochure.exists())
    
         CopyAssetsbrochure();
     

    /** PDF reader code */
    File file = new File("/sdcard/fleetman.pdf");        

    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.fromFile(file),"application/pdf");
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    try 
    
        getApplicationContext().startActivity(intent);
     
    catch (ActivityNotFoundException e) 
    
         Toast.makeText(MainActivity.this, "NO Pdf Viewer", Toast.LENGTH_SHORT).show();
    


//method to write the PDFs file to sd card
    private void CopyAssetsbrochure() 
        AssetManager assetManager = getAssets();
        String[] files = null;
        try 
        
            files = assetManager.list("");
         
        catch (IOException e)
        
            Log.e("tag", e.getMessage());
        
        for(int i=0; i<files.length; i++)
        
            String fStr = files[i];
            if(fStr.equalsIgnoreCase("fleetman.pdf"))
            
                InputStream in = null;
                OutputStream out = null;
                try 
                
                  in = assetManager.open(files[i]);
                  out = new FileOutputStream("/sdcard/" + files[i]);
                  copyFile(in, out);
                  in.close();
                  in = null;
                  out.flush();
                  out.close();
                  out = null;
                  break;
                 
                catch(Exception e)
                
                    Log.e("tag", e.getMessage());
                 
            
        
    

【参考方案1】：

  try this, hope it ll help you 

  @Override
    protected void onCreate(Bundle savedInstanceState)
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        CopyReadPDFFromAssets();

    

    private void CopyReadPDFFromAssets()
    
        AssetManager assetManager = getAssets();

        InputStream in = null;
        OutputStream out = null;
        File file = new File(getFilesDir(), "pdfdemofile.pdf");
        try
        
            in = assetManager.open("pdfdemofile.pdf");
            out = openFileOutput(file.getName(), Context.MODE_WORLD_READABLE);

            copyPdfFile(in, out);
            in.close();
            in = null;
            out.flush();
            out.close();
            out = null;
         catch (Exception e)
        
            Log.e("exception", e.getMessage());
        

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(
                Uri.parse("file://" + getFilesDir() + "/pdfdemofile.pdf"),
                "application/pdf");

        startActivity(intent);
    

    private void copyPdfFile(InputStream in, OutputStream out) throws IOException
    
        byte[] buffer = new byte[1024];
        int read;
        while ((read = in.read(buffer)) != -1)
        
            out.write(buffer, 0, read);
        
    

在清单文件中添加

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

【讨论】：

@gautamjoshi 那么请给我UpVote：P

我会给你 10 个 UpVotes。但收视率问题。给我你的电子邮件ID。如果我在某些问题上遇到困难会咨询你..:P ;)

或者你可以通过 [e-mail] 给我发邮件

只要你能做到就可以了