@SuppressWarnings("finally")
	public String getProperty(String key) {
		String value = "unknown";
		try {
			Class<?> c = Class.forName("android.os.SystemProperties");
			Method get = c.getMethod("get", String.class, String.class);
			value = (String) (get.invoke(c, key, "unknown"));
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			return value;
		}
	}

	public void setProperty(String key, String value) {
		try {
			Class<?> c = Class.forName("android.os.SystemProperties");
			Method set = c.getMethod("set", String.class, String.class);
			set.invoke(c, key, value);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}