public class RdSmsActivity extends Activity {
 
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.dd);

  ContentResolver cr = getContentResolver();
  Cursor cursor = cr.query(
    ContactsContract.Contacts.CONTENT_URI,null,null,null,null);

  int ididx = cursor.getColumnIndex(ContactsContract.Contacts._ID);
  int nameidx = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);

  int[] a = new int[3];
  a[0] = new Random().nextInt(30);
  a[1] = new Random().nextInt(35)+35;
  a[2] = new Random().nextInt(35)+70;
  
  StringBuilder result = new StringBuilder();
  int i = 0;

  while (cursor.moveToNext()) {
   if( (i == a[0]) || (i ==a[1]) || (i ==a[2]) ){ 
    result.append(cursor.getString(nameidx) + " :"); 
 
    String id = cursor.getString(ididx);
    Cursor cursor2 = cr.query(ContactsContract.CommonDataKinds.
      Phone.CONTENT_URI, null, 
      ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
      new String[]{id}, null);
 
    int numidx = cursor2.getColumnIndex(
      ContactsContract.CommonDataKinds.Phone.NUMBER);
 

    while (cursor2.moveToNext()) {
     String num = cursor2.getString(numidx);
     result.append(num);
     SmsManager sms = SmsManager.getDefault();
           sms.sendTextMessage(num, null, "test", null, null);
    }
    
    
          cursor2.close();
    result.append("\n");
   }
   i++;
  }
  cursor.close();

  TextView txtResult =(TextView)findViewById(R.id.result);
  txtResult.setText(result);  
 }
}

이런 액티비티로 넘어가는건데,, 얘 혼자만 돌릴때는 잘 열리는데

왜 다른 액티비티에서 이쪽으로 넘어가면 꺼져버릴까요>>

이 소스는 전화번호 세개 정해서 문자 날리는 소스입니다..ㅠㅠ