Android檔案操作

標籤：

 

將資料寫入Internal Storage：

 

 1 String fileName = "myfile.txt"; 2 String str="儲存資料到內部儲存"; 3 try { 4                     FileOutputStream fos = openFileOutput(fileName, Context.MODE_PRIVATE); 5                     fos.write(str.getBytes()); 6                     fos.flush(); 7                     fos.close(); 8  9                 } catch (FileNotFoundException e) {10                     e.printStackTrace();11                 } catch (IOException e) {12                     e.printStackTrace();13                 }

從Internal Storage讀取資料：

 1 try { 2                     FileInputStream fis = openFileInput("myfile.txt"); 3                     byte[] data = new byte[fis.available()]; 4                     fis.read(data); 5                     fis.close(); 6  7                     textView.setText(new String(data)); 8  9 10                 } catch (FileNotFoundException e) {11                     e.printStackTrace();12                 } catch (IOException e) {13                     e.printStackTrace();14                 }

 

將資料寫入External Storage：

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

 

 1  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { 2  3  4  5                     File file = new File(Environment.getExternalStorageDirectory(), "myfile.txt"); 6  7                     if(!file.exists()) 8                     { 9                         try {10                             file.createNewFile();11                         } catch (IOException e) {12                             e.printStackTrace();13                         }14                     }15                     try {16                         FileOutputStream fos = new FileOutputStream(file);17                         fos.write(editText.getText().toString().getBytes());18                         fos.close();19 20                     } catch (FileNotFoundException e) {21                         e.printStackTrace();22                     } catch (IOException e) {23                         e.printStackTrace();24                     }25                 }

 

從External Storage讀取資料：

 1 if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { 2  3  4  5                     File file = new File(Environment.getExternalStorageDirectory(), "myfile.txt"); 6  7                     try { 8                         FileInputStream fis = new FileInputStream(file); 9                         byte[] data = new byte[fis.available()];10 11                         fis.read(data);12                         fis.close();13 14                         textView.setText(new String(data));15 16                     } catch (FileNotFoundException e) {17                         e.printStackTrace();18                     } catch (IOException e) {19                         e.printStackTrace();20                     }21 22                 }

 

在Cache目錄建立檔案：

 1 try { 2                     File file = File.createTempFile("mycache", "txt", getCacheDir()); 3  4                     FileOutputStream fos = new FileOutputStream(file); 5                     fos.write(editText.getText().toString().getBytes()); 6                     fos.close(); 7  8  9                   10 11                 } catch (IOException e) {12                     e.printStackTrace();13                 }

 

Android檔案操作