您需要将光标定位到第一行之前，你可以从它那里得到的数据。要做到这一点，你可以拨打： mCursor.moveToFirst（）。此外，该方法调用返回一个布尔值，如果没有结果，这将是虚假的;所以你也可以用它来防止这种情况。

You need to position the Cursor to the first row before you can get data from it. To do this you can call: mCursor.moveToFirst(). Also, this method call returns a boolean, which will be false if there are no results; so you can also use it to guard against that case.

如果您需要通过多个结果迭代，然后调用后 mCursor.moveToFirst（），您可以使用 mCursor.moveToNext（）方法，通过结果行一个接一个。再次，当它到达的数据集的结尾这个返回false。

If you need to iterate through multiple results, then after calling mCursor.moveToFirst(), you can use the mCursor.moveToNext() method go through the result rows one by one. Once again, this returns false when it reaches the end of the data set.

希望是有道理的。