使用Android应用程序的listview

Question

private List<String> locations_list =new ArrayList<String>();
public DataBase db;
public ListView lv1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.locations);
    db = new DataBase(getApplicationContext());
    lv1=(ListView)findViewById(R.id.listView1);
    this.load_list();

    registerForContextMenu(lv1);
}

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
                                ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.context_menu, menu);
}

public boolean onContextItemSelected(MenuItem item){

        switch (item.getItemId()) {
        case R.id.set_property:
            //startActivity(new Intent(locations.this, add_location.class));
         return true;

        case R.id.set_location:

          return true;

        case R.id.edit:

              return true;

        case R.id.delete:
              db.location_delete(id);  // will send id of the recored to be deletion as parameter
              return true;
        }
        return false;
    }

    private void load_list(){
        Cursor locations_list_db=db.location_result();

        locations_list.clear();
        while(locations_list_db.moveToNext()){
            locations_list.add(locations_list_db.getString(locations_list_db.getColumnIndex("name")));
        } 


        lv1.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 , locations_list));
    }

我在load_list（）函数中从数据库加载数据到listview。 我想在onContextItemSelected（）函数中将选定的子项从数据库中删除。 我该怎么做 我的英语很糟糕。对不起。