public static void saveStrToSD(String filePath, String fileName, boolean isADD, String content) {
		if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
			try {
				File file = new File(filePath);
				if (!file.exists()) {
					file.mkdirs();
				}
				// 打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件
				FileWriter writer = new FileWriter(filePath + fileName, isADD);
				writer.write(content);
				writer.flush();
				writer.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}