I have read so many articles but still don’t get it. I have a

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Editorial Team

Asked: June 3, 20262026-06-03T07:35:31+00:00 2026-06-03T07:35:31+00:00

I have read so many articles but still don’t get it. I have a

0

I have read so many articles but still don’t get it.

I have a serial data which is a String type and i want to compare it with an integer.

This is the read serial data code:

case MESSAGE_READ:
                int i;

                byte[] readBuf = (byte[]) msg.obj; 


             // construct a string from the valid bytes in the buffer
                String readMessage = new String(readBuf, 0, msg.arg1);
                Log.i(LOG_TAG, readMessage);

                mTextView.setText(readMessage);
                String [] numbers = readMessage.split("\n");
                int [] intNumber = new int[numbers.length];
                //List<Integer> integers = new ArrayList<Integer>();


                for (String number : numbers) {

                    //integers.add(Integer.valueOf(number.trim()));
                    for (i=0;i<numbers.length;i++){
                        intNumber[i] = Integer.valueOf(number.trim());
                        if (intNumber[i]<0 || intNumber[i]>95){
                            //Some Actions
                        }
                    }
                }
                break;

And the LogCat shows:

05-06 17:28:06.919: D/BluetoothReadService(15090): connected
05-06 17:28:06.919: D/BluetoothReadService(15090): create ConnectedThread
05-06 17:28:06.929: D/BluetoothReadService(15090): setState() 2 -> 3
05-06 17:28:06.949: I/BluetoothReadService(15090): BEGIN mConnectedThread
05-06 17:28:06.969: I/HBAS(15090): MESSAGE_STATE_CHANGE: 3
05-06 17:28:07.079: I/HBAS(15090): 24

05-06 17:28:07.079: I/HBAS(15090): 25

05-06 17:28:07.079: I/HBAS(15090): 26

05-06 17:28:07.079: I/HBAS(15090): 27

05-06 17:28:07.079: I/HBAS(15090): 28

05-06 17:28:07.079: I/HBAS(15090): 29

05-06 17:28:07.079: I/HBAS(15090): 0

05-06 17:28:07.079: I/HBAS(15090): 1

05-06 17:28:07.079: I/HBAS(15090): 2

05-06 17:28:07.079: I/HBAS(15090): 3

05-06 17:28:07.079: I/HBAS(15090): 4

05-06 17:28:07.079: I/HBAS(15090): 5

05-06 17:28:07.079: I/HBAS(15090): 6

05-06 17:28:07.079: I/HBAS(15090): 7

05-06 17:28:07.079: I/HBAS(15090): 8

05-06 17:28:07.079: I/HBAS(15090): 9

05-06 17:28:07.079: I/HBAS(15090): 10

05-06 17:28:07.079: I/HBAS(15090): 11

05-06 17:28:07.079: I/HBAS(15090): 12

05-06 17:28:07.079: I/HBAS(15090): 13

05-06 17:28:07.079: I/HBAS(15090): 14

05-06 17:28:07.079: I/HBAS(15090): 15

05-06 17:28:07.079: I/HBAS(15090): 16

05-06 17:28:07.079: I/HBAS(15090): 17

05-06 17:28:07.079: I/HBAS(15090): 18

05-06 17:28:07.079: I/HBAS(15090): 19

05-06 17:28:07.079: I/HBAS(15090): 20

05-06 17:28:07.079: I/HBAS(15090): 21

05-06 17:28:07.079: I/HBAS(15090): 22

05-06 17:28:07.079: I/HBAS(15090): 23

05-06 17:28:07.079: I/HBAS(15090): 24

05-06 17:28:07.079: I/HBAS(15090): 25

05-06 17:28:07.079: I/HBAS(15090): 26

05-06 17:28:07.079: I/HBAS(15090): 27

05-06 17:28:07.079: I/HBAS(15090): 28

05-06 17:28:07.079: I/HBAS(15090): 29

05-06 17:28:07.079: I/HBAS(15090): 0

05-06 17:28:07.079: I/HBAS(15090): 1

05-06 17:28:07.079: I/HBAS(15090): 2

05-06 17:28:07.079: I/HBAS(15090): 3

05-06 17:28:07.079: I/HBAS(15090): 4

05-06 17:28:07.079: I/HBAS(15090): 5

05-06 17:28:07.079: I/HBAS(15090): 6

05-06 17:28:07.079: I/HBAS(15090): 7

05-06 17:28:07.079: I/HBAS(15090): 8

05-06 17:28:07.079: I/HBAS(15090): 9

05-06 17:28:07.079: I/HBAS(15090): 10

05-06 17:28:07.079: I/HBAS(15090): 11

05-06 17:28:07.079: I/HBAS(15090): 12

05-06 17:28:07.079: I/HBAS(15090): 13

05-06 17:28:07.079: I/HBAS(15090): 14

05-06 17:28:07.079: I/HBAS(15090): 15

05-06 17:28:07.079: I/HBAS(15090): 16

05-06 17:28:07.079: I/HBAS(15090): 17

05-06 17:28:07.079: I/HBAS(15090): 18

05-06 17:28:07.079: I/HBAS(15090): 19

05-06 17:28:07.079: I/HBAS(15090): 20

05-06 17:28:07.079: I/HBAS(15090): 21

05-06 17:28:07.079: I/HBAS(15090): 22

05-06 17:28:07.079: I/HBAS(15090): 23

05-06 17:28:07.079: I/HBAS(15090): 24

05-06 17:28:07.079: I/HBAS(15090): 25

05-06 17:28:07.079: I/HBAS(15090): 26

05-06 17:28:07.079: I/HBAS(15090): 27

05-06 17:28:07.079: I/HBAS(15090): 28

05-06 17:28:07.079: I/HBAS(15090): 29

05-06 17:28:07.079: I/HBAS(15090): 0

05-06 17:28:07.079: I/HBAS(15090): 1

05-06 17:28:07.079: I/HBAS(15090): 2

05-06 17:28:07.079: I/HBAS(15090): 3

05-06 17:28:07.079: I/HBAS(15090): 4

05-06 17:28:07.079: I/HBAS(15090): 5

05-06 17:28:07.079: I/HBAS(15090): 6

05-06 17:28:07.079: I/HBAS(15090): 7

05-06 17:28:07.079: I/HBAS(15090): 8

05-06 17:28:07.079: I/HBAS(15090): 9

05-06 17:28:07.079: I/HBAS(15090): 10

05-06 17:28:07.079: I/HBAS(15090): 11

05-06 17:28:07.079: I/HBAS(15090): 12

05-06 17:28:07.079: I/HBAS(15090): 13

05-06 17:28:07.079: I/HBAS(15090): 14

05-06 17:28:07.079: I/HBAS(15090): 15

05-06 17:28:07.079: I/HBAS(15090): 16

05-06 17:28:07.079: I/HBAS(15090): 17

05-06 17:28:07.079: I/HBAS(15090): 18

05-06 17:28:07.079: I/HBAS(15090): 19

05-06 17:28:07.079: I/HBAS(15090): 20

05-06 17:28:07.079: I/HBAS(15090): 21

05-06 17:28:07.079: I/HBAS(15090): 22

05-06 17:28:07.079: I/HBAS(15090): 23

05-06 17:28:07.079: I/HBAS(15090): 24

05-06 17:28:07.079: I/HBAS(15090): 25

05-06 17:28:07.079: I/HBAS(15090): 26

05-06 17:28:07.079: I/HBAS(15090): 27

05-06 17:28:07.079: I/HBAS(15090): 28

05-06 17:28:07.079: I/HBAS(15090): 29

05-06 17:28:07.079: I/HBAS(15090): 0

05-06 17:28:07.079: I/HBAS(15090): 1

05-06 17:28:07.079: I/HBAS(15090): 2

05-06 17:28:07.079: I/HBAS(15090): 3

05-06 17:28:07.079: I/HBAS(15090): 4

05-06 17:28:07.079: I/HBAS(15090): 5

05-06 17:28:07.079: I/HBAS(15090): 6

05-06 17:28:07.079: I/HBAS(15090): 7

05-06 17:28:07.079: I/HBAS(15090): 8

05-06 17:28:07.079: I/HBAS(15090): 9

05-06 17:28:07.079: I/HBAS(15090): 10

05-06 17:28:07.079: I/HBAS(15090): 11

05-06 17:28:07.079: I/HBAS(15090): 12

05-06 17:28:07.969: I/HBAS(15090): 1
05-06 17:28:08.029: I/HBAS(15090): 3

05-06 17:28:09.019: I/HBAS(15090): 14

05-06 17:28:09.979: I/HBAS(15090): 1
05-06 17:28:10.029: I/HBAS(15090): 5

05-06 17:28:10.989: I/HBAS(15090): 16

05-06 17:28:12.009: I/HBAS(15090): 17

05-06 17:28:12.999: I/HBAS(15090): 18

05-06 17:28:13.999: I/HBAS(15090): 19

05-06 17:28:14.999: I/HBAS(15090): 20

05-06 17:28:16.009: I/HBAS(15090): 21

05-06 17:28:17.009: I/HBAS(15090): 22

05-06 17:28:18.009: I/HBAS(15090): 23

05-06 17:28:19.019: I/HBAS(15090): 24

05-06 17:28:20.019: I/HBAS(15090): 25

05-06 17:28:21.029: I/HBAS(15090): 26

05-06 17:28:22.029: I/HBAS(15090): 27

05-06 17:28:23.029: I/HBAS(15090): 28

05-06 17:28:24.039: I/HBAS(15090): 29

05-06 17:28:25.039: I/HBAS(15090): 0

05-06 17:28:26.029: I/HBAS(15090): 1
05-06 17:28:26.069: I/HBAS(15090): 

05-06 17:28:26.069: D/AndroidRuntime(15090): Shutting down VM
05-06 17:28:26.069: W/dalvikvm(15090): threadid=1: thread exiting with uncaught exception (group=0x40018578)
05-06 17:28:26.079: E/AndroidRuntime(15090): FATAL EXCEPTION: main
05-06 17:28:26.079: E/AndroidRuntime(15090): java.lang.NumberFormatException: unable to parse '' as integer
05-06 17:28:26.079: E/AndroidRuntime(15090):    at java.lang.Integer.parseInt(Integer.java:362)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at java.lang.Integer.parseInt(Integer.java:332)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at java.lang.Integer.valueOf(Integer.java:506)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at com.android.hbas.FinalSetting$1.handleMessage(FinalSetting.java:362)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at android.os.Looper.loop(Looper.java:130)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at android.app.ActivityThread.main(ActivityThread.java:3687)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at java.lang.reflect.Method.invokeNative(Native Method)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at java.lang.reflect.Method.invoke(Method.java:507)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
05-06 17:28:26.079: E/AndroidRuntime(15090):    at dalvik.system.NativeStart.main(Native Method)

At start it worked but at some time it FC because of ‘ ‘ thing.
So any solution???
Thanks for the advice..

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1 Answer

Editorial Team · Answer 1 · 2026-06-03T07:35:32+00:00

Editorial Team

2026-06-03T07:35:32+00:00Added an answer on June 3, 2026 at 7:35 am

check your string is ' ' only.

    if(str.trim().length>0){

       try{ 

       int i =Integer.parseInt(str);

       }catch(NumberFormatException ne){
          System.out.println("could not parse :: " +ne);
        }

    }

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