Question

我正在尝试以文本的形式在数据库中以毫秒为单位节省时间。

long time= System.currentTimeMillis()

在我尝试检索它并转换为日期之后：

SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor c = db.query("MovementTable", null, null, null, null, null, null);
String str = "";

long a = c.getLong(0);

if (c.moveToFirst()) {
    do {
        if (!c.getString(6).equals("0"))
        str = str + c.getLong(0) + " - " +c.getLong(1) + CheckPoint(new LatLng(c.getDouble(2),c.getDouble(3)))
                + " to " + CheckPoint(new LatLng(c.getDouble(4),c.getDouble(5))) + " " + c.getString(6) + "\n";
    } while (c.moveToNext());
}
c.close();

Text.setText(str);
dbHelper.close();

代码崩溃然后我试图初始化“a”。但没有它，它就有效。在字符串结果是： 1433064363251 - 14330643544443 我究竟做错了什么？请帮忙。提前完成。

Answer 1

moveToFirst方法应该是第一个，然后你可以访问Cursor值。

if (c.moveToFirst()) {
    long a = c.getLong(0);
    do {
        if (!c.getString(6).equals("0"))
        str = str + c.getLong(0) + " - " +c.getLong(1) + CheckPoint(new LatLng(c.getDouble(2),c.getDouble(3)))
                + " to " + CheckPoint(new LatLng(c.getDouble(4),c.getDouble(5))) + " " + c.getString(6) + "\n";
    } while (c.moveToNext());
}
c.close();

将毫秒转换为日期

1 个答案: