如何从ListView中使用的CursorAdapter删除所选项目

问题描述

我使用的CursorAdapter 键，下面是我的适配器类。我的列表包括两个文本视图和每一行上的一个按钮。现在，对点击按钮的欲从列表以及从数据库中删除选择的项目。我怎样才能从数据库中选择项目的ID，这样我可以删除它，然后通知适配器（刷新列表）。

 公共类MyAdapter扩展的CursorAdapter {

    光标C;
    LayoutInflater充气;
    上下文语境;
    私人字符串变量=的getClass（）getSimpleName（）。

    公共MyAdapter（上下文的背景下，光标C）{
        超（背景下，C）;
        this.c = C;
        this.context =背景;
        充气= LayoutInflater.from（上下文）;
    }

    @覆盖
    公共无效bindView（查看视图，上下文的背景下，最终光标光标）{

        TextView的txtName的=（的TextView）view.findViewById（R.id.txt_name）;
        txtName.setText（cursor.getString（cursor.getColumnIndex（Helper.tbl_col_username）））;
        TextView的txtPassword =（TextView中）view.findViewById（R.id.txt_password）;
        txtPassword.setText（cursor.getString（cursor.getColumnIndex（Helper.tbl_col_password）））;

        Button按钮=（按钮）view.findViewById（R.id.btn_delete）;
        button.setOnClickListener（新OnClickListener（）{
            公共无效的onClick（查看为arg0）{
                Log.d（TAG，点击）;
            }
        }）;
    }
    @覆盖
    公共查看NewView的（上下文的背景下，光标光标的ViewGroup父）{
        视图V = inflater.inflate（R.layout.row，NULL）;
        返回伏;
    }
}
 

解决方案

尝试一些像这样的事情：

  @覆盖
公共无效bindView（查看视图，上下文的背景下，最终光标光标）{

    TextView的txtName的=（的TextView）view.findViewById（R.id.txt_name）;
    txtName.setText（cursor.getString（cursor.getColumnIndex（助手
                                                           .tbl_col_username）））;
    TextView的txtPassword =（TextView中）view.findViewById（R.id.txt_password）;
    txtPassword.setText（cursor.getString（cursor.getColumnIndex（助手
                                                           .tbl_col_password）））;

    最后弦乐的itemId = cursor.getString（cursor.getColumnIndex（ID））;

    Button按钮=（按钮）view.findViewById（R.id.btn_delete）;
    button.setOnClickListener（新OnClickListener（）{

        公共无效的onClick（查看为arg0）{
            Log.d（TAG，点击）;
            deleteRecordWithId（的itemId）;
            cursor.requery（）;
            notifyDataSetChanged（）;
        }
    }）;
}
 

I am using CursorAdapter and below is my adapter class. My list consists of two text views and one button on each row. Now, on click of the button I want to delete the selected item from the list as well as from the database. How can I get the id of the selected item from the database so that I can delete it and then notify the adapter (refresh the list).

public class MyAdapter extends CursorAdapter {

    Cursor c;
    LayoutInflater inflater;
    Context context;
    private String TAG = getClass().getSimpleName();

    public MyAdapter(Context context, Cursor c) {
        super(context, c);
        this.c = c;
        this.context = context;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public void bindView(View view, Context context, final Cursor cursor) {

        TextView txtName = (TextView) view.findViewById(R.id.txt_name);
        txtName.setText(cursor.getString(cursor.getColumnIndex(Helper.tbl_col_username)));
        TextView txtPassword = (TextView) view.findViewById(R.id.txt_password);
        txtPassword.setText(cursor.getString(cursor.getColumnIndex(Helper.tbl_col_password)));

        Button button = (Button) view.findViewById(R.id.btn_delete);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                Log.d(TAG, "Button Click ");
            }
        });
    }
    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        View v = inflater.inflate(R.layout.row, null);
        return v;
    }
}

解决方案

Try some thing like this :

@Override
public void bindView(View view, Context context, final Cursor cursor) {

    TextView txtName = (TextView) view.findViewById(R.id.txt_name);
    txtName.setText(cursor.getString(cursor.getColumnIndex(Helper
                                                           .tbl_col_username)));
    TextView txtPassword = (TextView) view.findViewById(R.id.txt_password);
    txtPassword.setText(cursor.getString(cursor.getColumnIndex(Helper
                                                           .tbl_col_password)));

    final String itemId = cursor.getString(cursor.getColumnIndex("id"));

    Button button = (Button) view.findViewById(R.id.btn_delete);
    button.setOnClickListener(new OnClickListener() {

        public void onClick(View arg0) {
            Log.d(TAG, "Button Click ");
            deleteRecordWithId(itemId);
            cursor.requery();
            notifyDataSetChanged();
        }
    });
}

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