求大神指教，本人在初學安卓，遇到了這個：Unfortunately，xxx has stopped！網上大部分說的原因是活動沒注冊，我明明注冊了啊到底是什么回事啊，求大神指教package?wsg.myapplication; import?android.app.Activity; import?android.content.Intent; import?android.os.Bundle; import?android.view.View; import?android.view.Window; import?android.widget.Button; import?android.widget.EditText; import?java.util.Calendar; public?class?ThirdActivity?extends?Activity?{ ????protected?void?onCreate(Bundle?savedInstanceState)?{ ????????super.onCreate(savedInstanceState); ????????requestWindowFeature(Window.FEATURE_NO_TITLE); ????????setContentView(R.layout.third_layout); ????????Button?bt3=(Button)findViewById(R.id.button3); ????????bt3.setOnClickListener(new?View.OnClickListener()?{ ????????????@Override ????????????public?void?onClick(View?v)?{ ????????????????EditText?editText=(EditText)findViewById(R.id.editText); ????????????????EditText?editText2=(EditText)findViewById(R.id.editText2); ????????????????EditText?editText3=(EditText)findViewById(R.id.editText3); ????????????????int?year,month,day; ????????????????int?year2,month2,day2; ????????????????int?i1,i2,i,week; ????????????????year2=Integer.parseInt(editText.getText().toString()); ????????????????month2=Integer.parseInt(editText2.getText().toString()); ????????????????day2=Integer.parseInt(editText3.getText().toString())?; ????????????????i1=dayofyear(year2,month2,day2); ????????????????Calendar?c?=?Calendar.getInstance(); ????????????????year?=?c.get(Calendar.YEAR); ????????????????month?=?c.get(Calendar.MONTH); ????????????????day?=?c.get(Calendar.DAY_OF_MONTH); ????????????????i2=dayofyear(year,month,day); ????????????????i=i1-i2; ????????????????week=i/7+1; ????????????????Intent?intent1=new?Intent(ThirdActivity.this,FirstActivity.class); ????????????????startActivity(intent1); ????????????} ????????}); ????} ???public?int?dayofyear(int?year,int?month,int?day){ ????????int?dateSum?=?0; ????????for(int?i?=?1;?i?<?month;?i++){ ????????????switch(i){ ????????????????case?1: ????????????????case?3: ????????????????case?5:?case?7:?case?8:?case?10:?case?12:dateSum?+=?31;?break; ????????????????case?4:?case?6:?case?9:?case?11:dateSum?+=?30;?break; ????????????????case?2: ????????????????????if(((year?%?4?==?0)?&&(year?%?100?!=?0))?||?(year?%?400?==?0)) ????????????????????????dateSum?+=?29; ????????????????????else?dateSum?+=?28; ????????????} ????????} ????????return?dateSum?=?(dateSum?+?day); ????} }這段代碼有問題嗎？從第三個活動跳到第一個活動程序就崩了