Question

我正在尝试显示一个Toast消息，供用户显示他选择的项目。我已将该列表作为另一个类的意图传递，并在类中接收它，其代码如下：

public class ListViewDelete extends ListActivity {



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.activity_list_view_delete);

    final Intent intent = getIntent();
    final Bundle extras = getIntent().getExtras();    //gets the GWID

    final MySQLitehelper dbhelper = new MySQLitehelper(this);
    ArrayList<String> thelist = new ArrayList<String>(extras.getStringArrayList(SelectOptions.EXTRA_MESSAGE));
    setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,extras.getStringArrayList(SelectOptions.EXTRA_MESSAGE)));
}       

public void onListItemClick(ListView parent, View view, int position, long id)
{
    Toast.makeText(this, "You have selected", Toast.LENGTH_LONG).show();
}
}

在最后一个onListItemClick中，如何在“你选择了”之后自定义，我可以把上面定义的arraylist项中的值设置好？

Answer 1

 public void onListItemClick(ListView parent, View view, int position, long id)
{
Toast.makeText(this, "You have selected"+position, Toast.LENGTH_LONG).show();
}

Answer 2

如果您有索引和arraylist，那么您可以通过索引引用集合中的字符串：

public class ListViewDelete extends ListActivity {

    private ArrayList<String> thelist;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_list_view_delete);

        final Intent intent = getIntent();
        final Bundle extras = getIntent().getExtras();    //gets the GWID

        final MySQLitehelper dbhelper = new MySQLitehelper(this);
        thelist = new ArrayList<String>(extras.getStringArrayList(SelectOptions.EXTRA_MESSAGE));
        setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,extras.getStringArrayList(SelectOptions.EXTRA_MESSAGE)));
    }       

    public void onListItemClick(ListView parent, View view, int position, long id)
    {
        Toast.makeText(this, "You have selected" + thelist.get(position), Toast.LENGTH_LONG).show();
    }
}

请注意，我将arrayList作为一个字段，以便能够从另一个方法引用它。

单击可单击列表时显示列表视图项选项

2 个答案: