将assets or raw folder文件复制到sd卡

有时候我们需要把程序的raw文件放在sd卡中，其实有时候这样做可以释放资源，有时候可能是使坏呼呼

void copyAssets() 
{ 
    String[] files; 
    try 
    { 
        files = this.getResources().getAssets().list(""); 
    } 
    catch (IOException e1) 
    { 
        return; 
    } 
 
    if(!mWorkingPath.exists()) 
    { 
        if(!mWorkingPath.mkdirs()) 
        { 
            new AlertDialog.Builder(this) 
                .setTitle(R.string.ERROR) 
                .setMessage(R.string.FAILED_DIR_CREATE) 
                .setPositiveButton(android.R.string.ok, new OnClickListener(){ 
                    @Override 
                    public void onClick(DialogInterface dialog, int which) 
                    { 
                        dialog.dismiss(); 
                    } 
                }) 
                .create() 
                .show(); 
        } 
    } 
 
    for(int i = 0; i < files.length; i++) 
    { 
        try 
        { 
            String fileName = files[i]; 
 
            if(fileName.compareTo("images") == 0 || 
               fileName.compareTo("sounds") == 0 || 
               fileName.compareTo("webkit") == 0) 
            { 
                continue; 
            } 
 
            File outFile = new File(mWorkingPath, fileName); 
            if(outFile.exists()) continue; 
 
            InputStream in = getAssets().open(fileName); 
            OutputStream out = new FileOutputStream(outFile); 
 
            // Transfer bytes from in to out 
            byte[] buf = new byte[1024]; 
            int len; 
            while ((len = in.read(buf)) > 0) 
            { 
                out.write(buf, 0, len); 
            } 
 
            in.close(); 
            out.close(); 
        } 
        catch (FileNotFoundException e) 
        { 
            e.printStackTrace(); 
        } 
        catch (IOException e) 
        { 
            e.printStackTrace(); 
        } 
    }