Android 檔案操作

Android 檔案操作操作時，要賦予相應的許可權：

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

 下面是向檔案寫文本的代碼：

         private final static String PATH = "/sdcard/lin";private final static String FILENAME = "/test.txt";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);writeFile();}private void writeFile() {//判斷裝置是否存在sdcardif (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {try {Log.d("File Operation", "start!");File path = new File(PATH);File file = new File(PATH+FILENAME);//如果不存在此路徑，則建立此路徑if (!path.exists()) {path.mkdir();}//如果不存在此檔案，則建立此檔案if (!file.exists()) {file.createNewFile();}//將"text message!"資訊寫入相應的檔案OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(file));osw.write("text message!");osw.close();Log.d("File Operation", "success!");} catch (Exception e) {Log.d("File Operation", "file create error");}}}