在試圖寫入SD卡時處理只讀文件系統

我嘗試將一些數據寫入SD卡，但正如您所看到的，我使用了TOAST，並且在按addbtn時得到此消息： 「只讀文件系統「 ，它很明顯，它不寫入SD卡所以我應該如何解決這個問題？由於事先這裏是我使用的代碼：在試圖寫入SD卡時處理只讀文件系統

case R.id.donebtn: 
    if (subject.getText().toString().isEmpty()) { 
     startActivity(new Intent(this, emptysbj.class)); 
    } 
    else { 
     String s = subject.getText().toString(); 
     String n = note.getText().toString(); 
     try { 
      File mydir = new File(Environment.getExternalStorageDirectory() 
        + File.separator + "myTasks" + File.separator + s); 
     mydir.mkdirs(); 
     File myFile = new File(s); 
     myFile.createNewFile(); 
     FileOutputStream fOut = new FileOutputStream(myFile); 
     OutputStreamWriter myOutWriter = 
       new OutputStreamWriter(fOut); 
     myOutWriter.append(n); 
     myOutWriter.close(); 
     fOut.close(); 
     Toast.makeText(getBaseContext(), 
       "Done writing to SD :" + s, 
       Toast.LENGTH_SHORT).show(); 
    } catch (Exception e) { 
     Toast.makeText(getBaseContext(), e.getMessage(), 
       Toast.LENGTH_SHORT).show(); 
    } 

} 
finish(); 
break;

，這裏是我的logcat堆棧：

> 10-15 19:36:27.195: I/[POST_RESELECT](8750): [spanChange] (o, 
> oldStart, newStart, oldEnd, 
> newEnd)=([email protected],-1,0,-1,0) 10-15 
> 19:36:27.195: I/[POST_RESELECT](8750): [spanChange] (o, oldStart, 
> newStart, oldEnd, 
> newEnd)=([email protected],-1,0,-1,0) 10-15 
> 19:36:27.195: I/[POST_RESELECT](8750): [spanChange] (o, oldStart, 
> newStart, oldEnd, 
> newEnd)=([email protected],-1,0,-1,0) 10-15 
> 19:36:27.195: I/[POST_RESELECT](8750): [spanChange] (o, oldStart, 
> newStart, oldEnd, 
> newEnd)=([email protected],-1,0,-1,0) 10-15 
> 19:36:27.205: I/[POST_RESELECT](8750): [spanChange] (o, oldStart, 
> newStart, oldEnd, 
> newEnd)=([email protected],-1,0,-1,0) 10-15 
> 19:36:27.205: I/[POST_RESELECT](8750): [spanChange] (o, oldStart, 
> newStart, oldEnd, 
> newEnd)=([email protected],-1,0,-1,0) 10-15 
> 19:36:29.067: I/[POST_RESELECT](8750): 
> [sendCursorChangeNotificationToIME] ENTER... 10-15 19:36:29.067: 
> I/[POST_RESELECT](8750): NOW IS XXX NOT COMPOSING..... 10-15 
> 19:36:29.067: I/[POST_RESELECT](8750): [getWordOnCursor] cursor_pos=0 
> 10-15 19:36:29.067: I/[POST_RESELECT](8750): 
> [sendCursorChangeNotificationToIME] TAP..... 10-15 19:36:29.067: 
> I/[POST_RESELECT](8750): 
> [sendCursorChangeNotificationToIME](content,cursor_start,tap)=(,0,false) 
> 10-15 19:36:29.617: I/[POST_RESELECT](8750): [handleTextChanged] 
> (start,before,after)=(0,0,1) 10-15 19:36:29.817: 
> I/[POST_RESELECT](8750): [handleTextChanged] 
> (start,before,after)=(1,0,1) 10-15 19:36:29.998: 
> I/[POST_RESELECT](8750): [handleTextChanged] 
> (start,before,after)=(2,0,1) 10-15 19:36:31.209: E/No such file or 
> directory(8750): Erfan

來源

2013-10-15 Erfan

異常消息？ –

嘗試http://stackoverflow.com/questions/6066030/read-only-file-system-on-android –

@Seraphim只突出了異常的消息，請再次看我編輯的問題請 – Erfan

變化：

File mydir = new File(Environment.getExternalStorageDirectory() +File.separator+ 
          "myTasks"+File.separator+s);

到：

File mydir = new File(Environment.getExternalStorageDirectory(), "myTasks");

的N，變化：

File myFile = new File(s);

到：

File myFile = new File(mydir, s);

來源

2013-10-15 14:28:42 CommonsWare

沒有解決我的問題，這次我得到這個味精：沒有這樣的文件或目錄（我想這是因爲我不能寫入內存，它的讀取只有 – Erfan

@ user2541758：將你的整個堆棧跟蹤粘貼到你的問題 – CommonsWare

我剛剛做到了，請檢查它，謝謝 – Erfan

也許你的代碼有被試圖寫裏面/這是只有讀取。如果要將文件存儲在SD卡內，則必須更改爲：

File root = Environment.getExternalStorageDirectory(); 
File file = new File(root, "myTasks" + File.separator + s);

來源

2013-10-15 14:29:00

沒有幫助我！ – Erfan

在試圖寫入SD卡時處理只讀文件系統

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