在內部存儲器中創建新的文件例外：java.io.IOException：打開失敗：ENOENT（沒有這樣的文件或目錄）

Question

我想在android設備的內部存儲器中創建新文件，但我得到的例外沒有這樣的文件或目錄

這裏是我的代碼： -

String APP_PATH_SD_CARD = "/XYZ/"; 
String APP_THUMBNAIL_PATH_SD_CARD = "Demodir"; 
String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD; 
File myFile,dir; 

try { 
     dir = new File(fullPath); 
     if (!dir.exists()) { 
      dir.mkdir(); 
     } 
     myFile = new File(fullPath, "Vitals.txt"); 
     if (myFile.exists()) { 
      myFile.delete(); 
      myFile.createNewFile(); 
     } else { 
      myFile.createNewFile(); 
     } 

     Toast.makeText(getBaseContext(),"File 'Vitals.txt' Created",Toast.LENGTH_SHORT).show(); 
    } catch (Exception e) { 
     Toast.makeText(getBaseContext(), e.getMessage(),Toast.LENGTH_SHORT).show(); 
    } 

AndroidManifest.xml中

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

Answer 1

而是斜線'\'或'/'使用File.seprator以獲得更好的性能。

一樣，

String APP_PATH_SD_CARD = "XYZ"; 
String APP_THUMBNAIL_PATH_SD_CARD = "Demodir"; 

String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() 
+ File.seprator+APP_PATH_SD_CARD+File.seprator+APP_THUMBNAIL_PATH_SD_CARD;