Check if true SDCard is mounted

SDCardManager.java

String strSDCardPath = System.getenv("SECONDARY_STORAGE");
        if ((null == strSDCardPath) || (strSDCardPath.length() == 0)) {
            strSDCardPath = System.getenv("EXTERNAL_SDCARD_STORAGE");
        }

try {
            // Open the file
            FileInputStream fs = new FileInputStream("/proc/mounts");

            DataInputStream in = new DataInputStream(fs);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));

            String strLine;
            StringBuilder sb = new StringBuilder();

            //Read File Line By Line
            while ((strLine = br.readLine()) != null)   {
                // Remember each line
                sb.append(strLine);
            }

            String s = sb.toString();

            if (s.contains(strSDCardPath)) {
                Log.d("BLA", "MOUNTED!!");
            } else {
                Log.d("BLA", "NOT MOUNTED");
            }

            //Close the stream
            in.close();
        } catch (Exception e) {
            //Catch exception if any
            e.printStackTrace();
        }