从 cursoradapter 中的 ListView 中删除项目

Question

我创建了一个带有文本框和图像的自定义列表。图片应删除数据库 sqlite 中的行。

在我的片段activity中，我使用的是sqlitedatabase的查询方式。

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，始终删除列表视图中的最后一行。（光标位置在最后）。

我不知道如何在单击时从列表视图中获取当前位置。请帮帮我

Answer 1

您正在 bindView 中初始化 idSpeaker，它始终为您提供数据的最后一个 ID。因此，当您从 table 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"));

从绑定视图到

    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();
        }
    });

Answer 2

解法：

我在 setOnClickListener 之前添加了查找光标位置的代码。

final int position = cursor.getPosition();



 imageViewStatus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int idSpeaker;

                mDatabaseHelper = new DatabaseHelper(context);
                mSqLiteDatabase = mDatabaseHelper.getWritableDatabase();


/////move to this position

                cursor.moveToPosition(position);
                idSpeaker = cursor.getInt(cursor.getColumnIndex("liked_id"));

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


                notifyDataSetChanged();
            }
        });

从 cursoradapter 中的 ListView 中删除项目

Delete Items from ListView in cursoradapter

sqlite

android

android-cursoradapter

android-studio