back = (Button) findViewById(R.id.back);
back.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if(pass_sum.length() == 1) {
pass_sum = null;
Pass_Check();
} else if(pass_sum.length() == 2) {
pass_sum = pass_num_1;
Pass_Check();
} else if(pass_sum.length() == 3) {
pass_sum = pass_num_1 + pass_num_2;
Pass_Check();
} else if(pass_sum.length() == 4) {
pass_sum = pass_num_1 + pass_num_2 + pass_num_3;
Pass_Check();
}
}
});
버튼을 누르면 하나씩 지워지는 소스 입니다.
4개의 숫자가 줄어들면서 3개 2개 1개 마지막엔 null 값을 넣습니다.
그런데 그 뒤에 한번 더 누르면 튕기네요...
아래는 로그캣입니다.
02-12 21:31:53.630: E/AndroidRuntime(30419): FATAL EXCEPTION: main
02-12 21:31:53.630: E/AndroidRuntime(30419): java.lang.NullPointerException
02-12 21:31:53.630: E/AndroidRuntime(30419): at project.star_note.Pass_Word$11.onClick(Pass_Word.java:130)
02-12 21:31:53.630: E/AndroidRuntime(30419): at android.view.View.performClick(View.java:4427)
02-12 21:31:53.630: E/AndroidRuntime(30419): at android.view.View$PerformClick.run(View.java:18307)
02-12 21:31:53.630: E/AndroidRuntime(30419): at android.os.Handler.handleCallback(Handler.java:725)
02-12 21:31:53.630: E/AndroidRuntime(30419): at android.os.Handler.dispatchMessage(Handler.java:92)
02-12 21:31:53.630: E/AndroidRuntime(30419): at android.os.Looper.loop(Looper.java:137)
02-12 21:31:53.630: E/AndroidRuntime(30419): at android.app.ActivityThread.main(ActivityThread.java:5279)
02-12 21:31:53.630: E/AndroidRuntime(30419): at java.lang.reflect.Method.invokeNative(Native Method)
02-12 21:31:53.630: E/AndroidRuntime(30419): at java.lang.reflect.Method.invoke(Method.java:511)
02-12 21:31:53.630: E/AndroidRuntime(30419): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
02-12 21:31:53.630: E/AndroidRuntime(30419): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
02-12 21:31:53.630: E/AndroidRuntime(30419): at dalvik.system.NativeStart.main(Native Method)