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This exception has no message.
java.lang.NullPointerException: 	at com.atry.MainActivity.openBT(MainActivity.java:120)	at com.atry.MainActivity$1.onClick(MainActivity.java:55)	at android.view.View.performClick(View.java:4439)	at android.widget.Button.performClick(Button.java:139)	at android.view.View$PerformClick.run(View.java:18395)	at android.os.Handler.handleCallback(Handler.java:725)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:176)	at android.app.ActivityThread.main(ActivityThread.java:5317)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)	at dalvik.system.NativeStart.main(Native Method)