在 ListView 中显示之前，将文本附加到从 SQLite 查询返回的数据

Question

我正在从 SQLite 数据库中检索一组结果并将其显示在 ListView 中。我想要做的是在结果值之前附加一些文本，然后再在实际 ListView.
中显示它例如，如果我从数据库中获取值 5，我想在 ListView 中将其显示为 Value = 5。

这是我用来更新 ListView 的代码：

private void displayListView() {
        Cursor cursor = dbHelper.fetchAllSubjects();

        String[] columns = new String[]{
                getSubjectsDbAdapter.KEY_SUBJECT,
                getSubjectsDbAdapter.KEY_SEMESTER,
                getSubjectsDbAdapter.KEY_ATTENDED,
                getSubjectsDbAdapter.KEY_TOTAL,
                getSubjectsDbAdapter.KEY_PERCENT
        };

        int[] to = new int[]{
                R.id.sub_out,
                R.id.semester_out,
                R.id.attended_out,
                R.id.total_out,
                R.id.percent_out
        };

        dataAdapter = new SimpleCursorAdapter(this, R.layout.list_layout, cursor, columns, to, 0);
        subject_list.setAdapter(dataAdapter);
}

我曾尝试对 String[] 数组进行以下修改：

private void displayListView() {
        Cursor cursor = dbHelper.fetchAllVals();

        String[] columns = new String[]{
                "Val1" + getSubjectsDbAdapter.KEY_1,
                "Val2: " + getSubjectsDbAdapter.KEY_2,
                "Val3: " + getSubjectsDbAdapter.KEY_3,
                "Val4: " + getSubjectsDbAdapter.KEY_4,
                "Val5: " + getSubjectsDbAdapter.KEY_5
        };

        int[] to = new int[]{
                R.id.one,
                R.id.two,
                R.id.three,
                R.id.four,
                R.id.five
        };

        dataAdapter = new SimpleCursorAdapter(this, R.layout.list_layout, cursor, columns, to, 0);
        subject_list.setAdapter(dataAdapter);
}

但这给了我以下错误：
java.lang.IllegalArgumentException: column 'Val2: val2Val3: val3' does not exist

Answer 1

我得到了答案here at SO。

Cursor allTaskcursor = databaseHelper.getAllTasks();
String[] from = {"name", "date"};
int[] to = new int[] {android.R.id.text1, android.R.id.text2};
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(context, android.R.layout.simple_list_item_2, allTaskcursor, from, to, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
cursorAdapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
    @Override
    public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
        if (view.getId() == android.R.id.text2) {
            int getIndex = cursor.getColumnIndex("date");
            int date = cursor.getInt(getIndex);
            TextView dateTextView = (TextView) view;
            dateTextView.setText(date + " days");
            return true;
        }
        return false;
    }
});
allTaskListView.setAdapter(cursorAdapter);

在 ListView 中显示之前，将文本附加到从 SQLite 查询返回的数据

Append text to data returned from SQLite query before displaying in ListView

android

android-listview