列表视图中的getItemIdAtPosition()未显示 [英] getItemIdAtPosition() in listview not showing

问题描述

我需要从listView获取getItemIdAtPosition()才能从sqlite数据库获取记录的ID.当我在任何项目上单击listView时，它始终显示"null"而不显示ID.

I need to get getItemIdAtPosition() from listView to get the id of the records from sqlite database. When i click on the listView on any item, it always shows "null" not showing the id.

这是代码:

       listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

               int id= ((int) listView.getItemIdAtPosition(i));

                //create our intent, as per usual
                Intent intent=new Intent(Tutorial10.this, Activity2.class);

                intent.putExtra(ID_EXTRA, id);
                startActivity(intent);
            }
        });

本活动2.java

public class Activity2 extends Activity{

String passedVar=null;
private TextView passedView=null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.act2);

    //Get our passed variable from our intent's EXTRAS
    passedVar=getIntent().getStringExtra(Tutorial10.ID_EXTRA);
    //find out text view
    passedView=(TextView)findViewById(R.id.passed);
    //display our passed variable!!!
    passedView.setText("YOU CLICKED ON="+passedVar);
}

}

推荐答案

您应更改此行

  int id= ((int) listView.getItemIdAtPosition(i));

与此

  long id = adapterView.getItemIdAtPosition(i);

我希望这可以解决您的问题.

I hope this fixes your problem.

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