FATAL EXCEPTION: main
Process: com.example.bluetooth.demo, PID: 16272
java.lang.NullPointerException: Attempt to invoke virtual method 'android.bluetooth.BluetoothGattService android.bluetooth.BluetoothGatt.getService(java.util.UUID)' on a null object reference
at com.example.bluetooth.demo.UartService.writeRXCharacteristic(UartService.java:418)
at com.example.bluetooth.demo.MainActivity.Datasend(MainActivity.java:712)
at com.example.bluetooth.demo.MainActivity.access$2600(MainActivity.java:89)
at com.example.bluetooth.demo.MainActivity$5.run(MainActivity.java:750)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
ble 통신앱을 개발중입니다... 대개는 잘 되지만 어느 순간 이런식으로 죽는 경우가 발생합니다.... 근데 보통 잘되다가 갑자기 null point에러가나는지 이해가 되질않아 진척이 없습니다...ㅠㅠㅠ 도와주십쇼...