Android 试图只显示时间

我试图使用sqlite在Datetime变量中选择时间，但它不起作用，它显示了这个错误

java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
        at android.database.CursorWindow.nativeGetString(Native Method)
        at android.database.CursorWindow.getString(CursorWindow.java:451)
        at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
        at com.nextinnovation.pt.barcodescanner.adapter.NewsAdapter.onBindViewHolder(NewsAdapter.java:85)
        at com.nextinnovation.pt.barcodescanner.adapter.NewsAdapter.onBindViewHolder(NewsAdapter.java:25)

这是我的方法：

    public Cursor getDate(Product produit){
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor res = db.rawQuery("select time(created_at) from " + TABLE_PRODUCT, null);
        return res;
    }

这就是我所说的：

Cursor date = db.getDate(mData.get(position));
        if (date.moveToFirst()){
            do{
                data = date.getString(date.getColumnIndex("created_at"));
                newsViewHolder.tv_date.setText(data);
                // do what ever you want here
            }while(date.moveToNext());
        }
        date.close();

---

在SQLite中，可以使用

strftime（）

：

请注意，您需要为表达式返回的列设置别名，以便以后可以按名称访问该列：

Cursor res = db.rawQuery(
    "select strftime('%H:%M:%S', created_at) as created_at from " + TABLE_PRODUCT, 
    null
);

---

谢谢，但请告诉我时间和日期，例如：昨天12点，我该怎么做？

Cursor res = db.rawQuery(
    "select strftime('%H:%M:%S', created_at) as created_at from " + TABLE_PRODUCT, 
    null
);