Question

我正在尝试在Moto G中运行的android 4.4.4版本中执行文件写入操作。我也在清单文件中添加了文件写入权限。但是文件写入会以各种可能的方式继续失败。

java.io.IOException: open failed: EACCES (Permission denied)

这是我收到的错误消息。我的代码在下面，

File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+"/text.txt");
if (!file.exists()) {
              try {
                file.createNewFile();
                FileWriter fw = new FileWriter(file.getAbsoluteFile());
                BufferedWriter bw = new BufferedWriter(fw);
                bw.write("hi");
                bw.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            }

请帮我解决这个问题。我试着用各种可能的方式。但无法找到解决方案。

Answer 1

 //check if external storage is available and not read only 
  if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) { 

  }
  else {
   myExternalFile = new File(getExternalFilesDir(filepath), filename);
  }

 private static boolean isExternalStorageReadOnly() { 
  String extStorageState = Environment.getExternalStorageState(); 
  if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) { 
   return true; 
  } 
  return false; 
 } 

 private static boolean isExternalStorageAvailable() { 
  String extStorageState = Environment.getExternalStorageState(); 
  if (Environment.MEDIA_MOUNTED.equals(extStorageState)) { 
   return true; 
  } 
  return false; 
 }

试试这个链接http://developer.android.com/reference/android/content/Context.html#getDir%28java.lang.String,%20int%29

context.getDir("mydir", Context.MODE_PRIVATE); //Creating an internal dir;
File fileWithinMyDir = new File(mydir, "myfile"); //Getting a file within the dir.
FileOutputStream out = new FileOutputStream(fileWithinMyDir); //Use the stream as usual to write into

使用内部存储

链接http://developer.android.com/guide/topics/data/data-storage.html#filesInternal

String FILENAME = "hello_file";
String string = "hello world!";

FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();

链接： http://www.mysamplecode.com/2012/06/android-internal-external-storage.html

使用java.io.IOException在android中文件写入失败：打开失败：EACCES（权限被拒绝）

1 个答案: