Android 建立文件夹、生成文件并写入文本文件内容

<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+"");
		}
	}