没有找到获取文件例外 [英] getting file not found exception

问题描述

我有我的android活动：

I have my android activity :

try {  
            File root=Environment.getExternalStorageDirectory();  
            Log.i("root",root.toString());  
                            File dir=new File(root.getAbsolutePath() + "/downloads");  
            dir.mkdirs();  
            file=new File(dir,"mytext.txt");  
            FileOutputStream out=new FileOutputStream(file,true);  
            PrintWriter pw=new PrintWriter(out);  
            pw.println("Hello! Welcome");  
            pw.println("You are Here...!!!");  
            pw.flush();  
            pw.close();  
            try {  
                 out.close();  
            } catch (IOException e) {  
            // TODO Auto-generated catch block  
                e.printStackTrace();  
          }
        } catch (FileNotFoundException e) {  
             // TODO Auto-generated catch block  
             e.printStackTrace();
        }  

还补充道：

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

但它引发我FileNotfound异常： 九月1日至13日：06：44.442：WARN / System.err的（419）：java.io.FileNotFoundException：/mnt/sdcard/downloads/mytext.txt（没有这样的文件或目录）

but it throws me FileNotfound exception : 01-13 09:06:44.442: WARN/System.err(419): java.io.FileNotFoundException: /mnt/sdcard/downloads/mytext.txt (No such file or directory)

如果我添加

 if(file.exists()){  
   System.out.println("file exists");  
  }  
  else{  
     System.out.println("No such Fileeeeeeeeee");  
   }  

它移动到其他的一部分。

it moves into "else" part.

感谢
Sneha

Thanks
Sneha

推荐答案

试试这个,,它为我的作品

Try this,,it works for me

// create a File object for the parent directory
File wallpaperDirectory = new File("/sdcard/Wallpaper/");
// have the object build the directory structure, if needed.
wallpaperDirectory.mkdirs();
// create a File object for the output file
File outputFile = new File(wallpaperDirectory, filename);
//now attach OutputStream to the file object, instead of a String representation

FileOutputStream fos = new FileOutputStream(outputFile);

<一个href="http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%28%29">GO通过此了解更多详情

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