从单击的列表视图项中获取文本 [英] Getting text from a clicked listview item

问题描述

我的ListView是从我的数据库中提取的配方列表.我正在尝试在ListView中获取单击项的文本.通过数据库调用和游标适配器填充ListView.我想使用所选项目的文本在另一个活动中进行另一个数据库调用.这是代码块

My ListView is a list of recipes pulled from my database. I am trying to get the text of a clicked item in my ListView. The ListView is populated through a database call and a cursoradapter. I want to use the text of the selected item to make another database call in another activity. Here is the code chunk

listView.setClickable(true);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position,
                long id) {
            final String text = ((TextView)v).getText().toString();
            recipeid = myDBAdapter.getRecipeID(text);
            Intent intent = new Intent(ListAllRecipes.this, DisplayRecipe.class);
            intent.putExtra("recipeid", recipeid);
            startActivity(intent);

        }

    });

运行代码时，我得到

04-22 14:08:37.022: E/AndroidRuntime(25206): FATAL EXCEPTION: main
04-22 14:08:37.022: E/AndroidRuntime(25206): java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
04-22 14:08:37.022: E/AndroidRuntime(25206):    at com.example.ketorecipes.ListAllRecipes$1.onItemClick(ListAllRecipes.java:47)

当我在ListView中单击一个项目时.

when I click on an item in the ListView.

以下是该活动的一个块:

Here is the Activity in one chunk:

public class ListAllRecipes extends Activity{
private DBAdapter myDBAdapter;
private ListView listView;
private int recipeid;

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



    myDBAdapter = new DBAdapter(this);
    myDBAdapter.openToRead();
    Cursor c = myDBAdapter.getValues();

    listView = (ListView)findViewById(R.id.listView1);
    String[] from = new String[] {"_id"};
    int[] to = new int[] {R.id.name_entry};
    SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.list_entry, c, from, to);
    listView.setAdapter(cursorAdapter);



    listView.setClickable(true);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position,
                long id) {
            final String text = ((TextView)v).getText().toString();
            recipeid = myDBAdapter.getRecipeID(text);
            Intent intent = new Intent(ListAllRecipes.this, DisplayRecipe.class);
            intent.putExtra("recipeid", recipeid);
            startActivity(intent);

        }

    });
}

}

推荐答案

您将_id与R.id.name_entry关联，因此您的列表由_id的值组成.

You associate _id with R.id.name_entry, so your list consists of whatever the values of _id are.

String[] from = new String[] {"_id"};
int[] to = new int[] {R.id.name_entry};  

如果是这样，您可以通过

If that is so you can get the name which is _id by

Cursor c = cursorAdapter.getCursor();
String text = c.getString(c.getColumnIndex("_id"));

这篇关于从单击的列表视图项中获取文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！