android - 从 CursorAdapter 中的 ListView 中删除项目

Question

我创建了一个包含文本框和图像的自定义列表。图像应删除数据库 SQLite 中的行。

在我的 fragment Activity 中，我使用sqlitedatabase的查询方法。

cursor = mSqLiteDatabase.rawQuery("SELECT liked_id as _id, liked_presentation_id FROM liked", null);
LikedListCursorAdapter likedListCursorAdapter = new LikedListCursorAdapter(getActivity(), cursor);
lvItems.setAdapter(likedListCursorAdapter);

/////////////我的光标适配器

public class LikedListCursorAdapter extends CursorAdapter {

SQLiteDatabase mSqLiteDatabase;
int idSpeaker,idPresentation;
TextView textViewName, textViewCompany, textViewTitle, textViewDate, textViewAboutReport;
LinearLayout linearLayout;

   public static ImageView imageViewStatus;
    private DatabaseHelper mDatabaseHelper;

public LikedListCursorAdapter(Context context, Cursor cursor) {
    super(context, cursor);

}


@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    return LayoutInflater.from(context).inflate(R.layout.liked_list, parent, false);
}

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

    imageViewStatus = (ImageView) view.findViewById(R.id.imageViewStatus);

    textViewTitle = (TextView) view.findViewById(R.id.textViewTitle);
    textViewDate = (TextView) view.findViewById(R.id.textViewTime);

    idSpeaker = cursor.getInt(cursor.getColumnIndex("_id"));

///////////////delete item

    imageViewStatus.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.w("id",String.valueOf(idSpeaker));
            mDatabaseHelper = new DatabaseHelper(context);

            mSqLiteDatabase = mDatabaseHelper.getWritableDatabase();

            mSqLiteDatabase.delete(mDatabaseHelper.TABLE_LIKED,
                    "liked_id = ?",
                    new String[] {String.valueOf(idSpeaker)});
            cursor.requery();


            notifyDataSetChanged();
        }
    });

但是，请始终删除 listView 中的最后一行。 (光标位置是最后一个)。

当我点击时，我不知道如何从 ListView 中获取当前位置。请帮助我

Answer 1

您正在bindView中初始化您的idSpeaker，它总是为您提供数据的最后一个ID。因此，当您从表格中删除时，您的最后一项将被删除。

你只需要移动你的一行

idSpeaker=cursor.getInt(cursor.getColumnIndex("_id"));

从绑定(bind) View 到

    imageViewStatus.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
           cursor.moveToPosition(position);
           idSpeaker = cursor.getInt(cursor.getColumnIndex("_id"));

            Log.w("id",String.valueOf(idSpeaker));
            mDatabaseHelper = new DatabaseHelper(context);

            mSqLiteDatabase = mDatabaseHelper.getWritableDatabase();

            mSqLiteDatabase.delete(mDatabaseHelper.TABLE_LIKED,
                    "liked_id = ?",
                    new String[] {String.valueOf(idSpeaker)});
            cursor.requery();


            notifyDataSetChanged();
        }
    });