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

	private void initData() {		String filePath = "/sdcard/Test/";		String fileName = "log.txt";				writeTxtToFile("txt content", filePath, fileName);	}	// 将字符串写入到文本文件中	public void writeTxtToFile(String strcontent, String filePath, String fileName) {		//生成文件夹之后，再生成文件，不然会出错		makeFilePath(filePath, fileName);				String strFilePath = filePath+fileName;		// 每次写入时，都换行写		String strContent = strcontent + "\r\n";		try {			File file = new File(strFilePath);			if (!file.exists()) {				Log.d("TestFile", "Create the file:" + strFilePath);				file.getParentFile().mkdirs();				file.createNewFile();			}			RandomAccessFile raf = new RandomAccessFile(file, "rwd");			raf.seek(file.length());			raf.write(strContent.getBytes());			raf.close();		} catch (Exception e) {			Log.e("TestFile", "Error on write File:" + e);		}	}	// 生成文件	public File makeFilePath(String filePath, String fileName) {		File file = null;		makeRootDirectory(filePath);		try {			file = new File(filePath + fileName);			if (!file.exists()) {				file.createNewFile();			}		} catch (Exception e) {			e.printStackTrace();		}		return file;	}		// 生成文件夹	public static void makeRootDirectory(String filePath) {		File file = null;		try {			file = new File(filePath);			if (!file.exists()) {				file.mkdir();			}		} catch (Exception e) {			Log.i("error:", e+"");		}	}