如何在我的应用程序android上检查我的互联网访问

public void onCreate(Bundle savedInstanceStatE) {
    super.onCreate(savedInstanceStatE);
    String[] listpeta = new String[] { "TMII","Anjungan","Museum","Tempat Ibadah","Taman","Wahana Rekreasi"};
    //Menset nilai array ke dalam list adapater sehingga data pada array akan dimunculkan dalam list
    this.setlistadapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,listpeta));
}

@Override
protected void onListItemClick(ListView l,View v,int position,long id) {
    super.onListItemClick(l,v,position,id);
    //Menangkap nilai text yang dklik
    Object o = this.getlistadapter().getItem(position);
    final String keyword = o.toString();
    //Menampilkan list peta.


        final ProgressDialog myProgressDialog = ProgressDialog.show(ListPeta.this,"Loading","Mohon Tunggu...!!!",truE);
        new Thread() { 
              public void run() { 
                   try{
                       Thread.sleep(1000); 
                       if(keyword=="TMII"){petapa="tmii";}
                       else if(keyword=="Anjungan"){petapa="anjungan";}
                       else if(keyword=="Museum"){petapa="museum";} 
                       else if(keyword=="Tempat Ibadah"){petapa="tempatibadah";}
                       else if(keyword=="Taman"){petapa="taman";}
                       else if(keyword=="Wahana Rekreasi"){petapa="rekreasi";}

                       Intent slide2 = new Intent(ListPeta.this,FormPetaTmiiOnline.class);
                       startActivity(slide2);
                   } catch (Exception E) {  } 
                   // Dismiss the Dialog
                   myProgressDialog.dismiss(); 
              } 
         }.start();

}

如果有人帮助我并给我一个源代码..告诉我在哪里我必须把它放在我的源代码上…