安卓判断是否有Root权限

public static boolean hasRootPerssion() {
		PrintWriter PrintWriter = null;
		Process process = null;
		try {
			process = Runtime.getRuntime().exec("su");
			PrintWriter = new PrintWriter(process.getOutputStream());
			PrintWriter.flush();
			PrintWriter.close();
			int value = process.waitFor();
			return returnResult(value);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (process != null) {
				process.destroy();
			}
		}
		return false;
	}