<span style="white-space:pre">		</span>//建立資料夾
		File file = new File("/sdcard/test");
		if (!file.exists()) {
			file.mkdir();
		}
		//建立檔案
		File filey = new File("/sdcard/test/.sys.txt");
		if (!filey.exists()) {
			try {
				filey.createNewFile();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		try {
			BufferedWriter bw = new BufferedWriter(new FileWriter(filey));
			String temp = "123";
			bw.write(temp);
			bw.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		File filex = new File("/sdcard/test/.sys.txt");
		BufferedReader br;
		try {
			br = new BufferedReader(new FileReader(filex));
			System.out.println("br.readLine=" + br.readLine());
		} catch (Exception e) {
			e.printStackTrace();
		}
 

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