Question

我的数据库中有三个具有三个字符串属性的对象。其中一个显示日期信息，例如。 2016年4月1日，20.10.2017。我在ListView中列出这些对象，但在我想按日期排序之前。

//
//Show all Data on ListView
//
private void displayListView() {


    Cursor cursor = datasource.fetchAllData();

    // The desired columns to be bound
    String[] columns = {
            DatabaseHelper.COLUMN_TITLE,
            DatabaseHelper.COLUMN_DESCRIPTION,
            DatabaseHelper.COLUMN_DEADLINE,
    };

    // the XML defined views which the data will be bound to
    int[] to = new int[] {
            R.id.processobject_title,
            R.id.processobject_description,
            R.id.processobject_deadline,
    };

    // create the adapter using the cursor pointing to the desired data
    //as well as the layout information
    dataAdapter = new SimpleCursorAdapter(
            this, R.layout.listview_viewlayout,
            cursor,
            columns,
            to,
            0);

    ListView listView = (ListView) findViewById(R.id.listview);
    ArrayList <ProcessObject> arrayList = new ArrayList<>();
    // Assign adapter to ListView

    listView.setAdapter(dataAdapter);
    activateAddButton();
    OnItemClickListener();

};

我看到了两个问题：对光标进行排序，或者将数组排序为[]。但我不知道如何。

public Cursor fetchAllData(){

    Cursor cursor = database.query(DatabaseHelper.TABLE_DATABASE, columns, null, null, null, null, null);
    if (cursor != null) {
        cursor.moveToFirst();
    }
    return cursor;
}

Answer 1

解决了它：

String orderBy =  DatabaseHelper.COLUMN_DEADLINE + " ASC";;
    Cursor cursor = database.query(DatabaseHelper.TABLE_DATABASE, columns, null, null, null, null, orderBy);

按字符串项排序ListView

1 个答案: