'TabActivity 내에서 ActivityGroup을 사용할 경우의 Navigation 처리' 블로그 내용을 보고,
샘플 소스를 따라해 보고,

제가 원하는 것을 짤려고하는데...잘 되지 않습니다.
붉은색으로 표기

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mpos);
        mPos_next = (Button)findViewById(R.id.btn_mpos_next);
        mPos_next.setOnClickListener(new Button.OnClickListener(){
         @Override
         public void onClick(View v) {
          
          Intent i = new Intent(getApplicationContext(), Step1.class);
          
          View view = FirstGroup.group.getLocalActivityManager()
                .startActivity("Step1", i
                .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
                .getDecorView();
          
                // Again, replace the view
                FirstGroup.group.replaceView(view);
               
         }
        });
       
    }

소스

오류메시지
04-15 05:04:29.701: INFO/ActivityManager(59): Displayed activity com.mobilePOS/.MenuMain: 710 ms (total 710 ms)
04-15 05:06:00.931: DEBUG/AndroidRuntime(4553): Shutting down VM
04-15 05:06:00.931: WARN/dalvikvm(4553): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553): FATAL EXCEPTION: main
04-15 05:06:00.961: ERROR/AndroidRuntime(4553): java.lang.NullPointerException
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at com.mobilePOS.mPOS$1.onClick(mPOS.java:27)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at android.view.View.performClick(View.java:2408)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at android.view.View$PerformClick.run(View.java:8816)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at android.os.Handler.handleCallback(Handler.java:587)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at android.os.Looper.loop(Looper.java:123)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at android.app.ActivityThread.main(ActivityThread.java:4627)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at java.lang.reflect.Method.invokeNative(Native Method)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at java.lang.reflect.Method.invoke(Method.java:521)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-15 05:06:00.961: ERROR/AndroidRuntime(4553):     at dalvik.system.NativeStart.main(Native Method)
04-15 05:06:00.981: WARN/ActivityManager(59):   Force finishing activity com.mobilePOS/.MenuMain
04-15 05:06:01.521: WARN/ActivityManager(59): Activity pause timeout for HistoryRecord{45097368 com.mobilePOS/.MenuMain}
04-15 05:06:03.271: INFO/Process(4553): Sending signal. PID: 4553 SIG: 9


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