Question

我需要帮助检索我的ListView项ID，以添加删除功能。我的ListView填充了以下代码：

ListView BookList = (ListView)findViewById(R.id.listView1);
    DbAdapter db = new DbAdapter(getApplicationContext());
    db.open();
    Cursor cursor = db.fetchAllBooks();
    startManagingCursor(cursor);
    SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.book, cursor, new String[]{DbAdapter.KEY_TITLE,DbAdapter.KEY_AUTHOR},new int[]{R.id.booktitle,R.id.bookauthor});
    BookList.setAdapter(adapter);
    if(cursor.moveToFirst()) {
            while (cursor.moveToNext());
    }
    db.close();

我的删除代码在DbAdapter类中设置为：

//delete a book      
public boolean deleteBook(long bookID) {
return database.delete(DATABASE_TABLE, KEY_BOOKID + "=" + bookID, null) > 0;
}

任何帮助？

完整资料来源：pastebin.com/kKgePkPM

Answer 1

如果我理解正确，您可以将onitemclicklistener添加到listview，然后使用行id将其从数据库中删除，如果bookid与行ID相同。

BookList.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view,
        int position, long id) {

       if (db.deleteBook(position)) { // Success!
            // remove from listview data source here
            adapter.notifyDataSetChanged();
       }


    }
  });

Answer 2

您必须为listView添加一个侦听器。最好的方法是设置

bookList.setOnItemClickListener(new OnItemClickListener() {
   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                    
    // DO YOUR STUFF HERE 
    }        
});

在那里，您将获得视图和点击的位置。通过视图或位置，您可以获得“deletebook”方法所需的值。

Answer 3

尝试在getView方法中添加类似内容：

Button btnDelete = (Button) convertedRowView.findViewById(R.id.btnDeleteCustom);
btnDelete.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        int itemPos = 4; // This is position of item in ArrayList
        deleteBook(getItemId(itemPos));
    }
});

从填充的ListView中获取项目ID

3 个答案: