you are very nice, thank you for your code ,when I run the ClientActivity project, this question is coming, Can you help me ?
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android_tcp, PID: 16311
java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.BufferedWriter.write(java.lang.String)' on a null object reference
at com.example.android_tcp.MainActivity.send(MainActivity.java:146)
at com.example.android_tcp.MainActivity$2.onClick(MainActivity.java:66)
at android.view.View.performClick(View.java:6291)
at android.view.View$PerformClick.run(View.java:24931)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:101)
at android.os.Looper.loop(Looper.java:166)
at android.app.ActivityThread.main(ActivityThread.java:7425)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)
YenRen
commented
3 years ago
you are very nice, thank you for your code ,when I run the ClientActivity project, this question is coming, Can you help me ?
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.android_tcp, PID: 16311 java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.BufferedWriter.write(java.lang.String)' on a null object reference at com.example.android_tcp.MainActivity.send(MainActivity.java:146) at com.example.android_tcp.MainActivity$2.onClick(MainActivity.java:66) at android.view.View.performClick(View.java:6291) at android.view.View$PerformClick.run(View.java:24931) at android.os.Handler.handleCallback(Handler.java:808) at android.os.Handler.dispatchMessage(Handler.java:101) at android.os.Looper.loop(Looper.java:166) at android.app.ActivityThread.main(ActivityThread.java:7425) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)