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;
}