格式化数据库结果为逗号分隔

时间:2016-11-15 22:42:01

标签: android database

在Stackoverflow上关注此question的教程。查询数据库后,我在变量results中有记录。如何格式化结果以使其可以是数组。以下是一个例子:

lvActivityCategory.setAdapter(new categoryCursorAdaptor(this, new String[] { "data1", "data2" }));

这是我目前使用的代码:

        List<String> arrayCatNames = new ArrayList<String>();
        String query = "SELECT * FROM category ORDER BY name ASC";
        Cursor results = myDB.rawQuery(query, null);
        while(results.moveToNext()){
            String catName = results.getString(results.getColumnIndex("name"));
            arrayCatNames.add(catName);
        }
        android.text.TextUtils.join(",", arrayCatNames);
        lvActivityCategory = (ListView) findViewById(R.id.lvActivityCategory);
        lvActivityCategory.setAdapter(new categoryCursorAdaptor(this, new String[] { arrayCatNames })); //arrayCatNames should be e.g. "item 1", "item 2", "item 3"

1 个答案:

答案 0 :(得分:1)

好的,在你的while循环之后执行以下操作

String[] catNamesArr = new String[arrayCatNames.size()];
catNamesArr = arrayCatNames.toArray(catNamesArr);

您可以阅读以下问题了解更多信息:Convert ArrayList<String> to String[] array