Question

我可以添加到数据库并列表作为列表视图。当我使用onListItemClick单击列表项时，我需要什么语句来获取值？

 package cabs.h;

import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
import android.widget.AdapterView.AdapterContextMenuInfo;
    public class planner extends ListActivity {
    private static final int ACTIVITY_CREATE=0;
    private static final int ACTIVITY_EDIT=1;
    private static final int INSERT_ID = Menu.FIRST;
    private static final int DELETE_ID = Menu.FIRST + 1;
    private NotesDbAdapter mDbHelper;
    private Long mRowId;
    private ServerResponce AllList;
    // private DeviceListAdapter AllList;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listonruntime);
        mDbHelper = new NotesDbAdapter(this);
        mDbHelper.open();
        fillData();
        registerForContextMenu(getListView());

        String responce = null ;
       // startManagingCursor(responce);
        //AllList = new ServerResponce(responce);
    }
    private void fillData() {
        Cursor notesCursor = mDbHelper.fetchAllNotes();
        startManagingCursor(notesCursor);

        // Create an array to specify the fields we want to display in the list (only TITLE)
        String[] from = new String[]{NotesDbAdapter.KEY_BODY,NotesDbAdapter.KEY_TITLE,NotesDbAdapter.KEY_NUMBER};

        int[] to = new int[]{R.id.toptext,R.id.middletext,R.id.circle};

       SimpleCursorAdapter notes =   
                                    new SimpleCursorAdapter(this, R.layout.row, notesCursor, from, to);

    setListAdapter(notes);

    }




    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.add(0, DELETE_ID, 0, R.string.menu_delete);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch(item.getItemId()) {
            case DELETE_ID:
                AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
                mDbHelper.deleteNote(info.id);
                fillData();
                return true;
        }
        return super.onContextItemSelected(item);
    }

      @Override
    protected void onSaveInstanceState(Bundle outState) 
    {
        super.onSaveInstanceState(outState);
        saveState();
        outState.putSerializable(NotesDbAdapter.KEY_ROWID, mRowId);
    }

    @Override
    protected void onPause() {
        super.onPause();
        saveState();
    }

    @Override
    protected void onResume() {
        super.onResume();

    }
       // ServerResponce servresp=new ServerResponce();
       String responceId = Activity1.getData();
        String responceno = Activity2.getData();
        String city = cabbookingapplication.Selection;
        String area = cabbookingapplication.Selection2;
        String exactadd  = cabbookingapplication.Selection3;
        String nearby = cabbookingapplication.Selection4;
        private void saveState() {
        String title =("FROM LOC::"+city+","+area+","+exactadd+","+nearby);
        String body = ("TO LOC::"+city+","+area+","+exactadd+","+nearby);
        String number = (""+responceno+",,"+responceId);
            if (mRowId == null) {
            long id = mDbHelper.createNote(title, body, number);
            if (id > 0) {
                mRowId = id;
            }
        } else {
            mDbHelper.updateNote(mRowId, title, body,number);
            }
        }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long thisID)
    {
        super.onListItemClick(l, v, position, thisID);
        String resposponseid = Activity2.getData();
        Object o = this.getListAdapter().getItemId(position);


       // String device_name = (String) (planner.this). getListAdapter().getItem(position);


        Toast.makeText(this, "this row responceid is= " + " " + keyword, Toast.LENGTH_LONG).show();


    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) 
    {
        super.onActivityResult(requestCode, resultCode, intent);
        fillData();

    }

}

并在列表项上单击我想要根据行位置保存在列表项中的反向值怎么做

 @Override
    **protected void onListItemClick(ListView l, View v, int position, long thisID)
    {
        super.onListItemClick(l, v, position, thisID);
        String resposponseid = Activity2.getData();
        Object o = this.getListAdapter().getItemId(position);



          Toast.makeText(this, "this row responceid is= " + " " + keyword, Toast.LENGTH_LONG).show();


    }**

Answer 1

如果查看方法onListItemClick()的文档，则可以看到最后一个参数是所单击项的行ID。

此方法将在调用时调用   选择列表中的项目。   子类应该覆盖。子类   能打电话   getListView（）。getItemAtPosition（位置）   如果他们需要访问数据   与所选项目相关联。

参数

l：发生点击的ListView

v：在ListView中单击的视图

position：列表中视图的位置

id：项目的行ID   点击

但是要获得正确的行id，传递给适配器的游标包含一个名为“ _id ”的行，表示表中每行的唯一ID非常重要。

如何从列表项的数据库中获取值根据列表项的位置单击

1 个答案: