我在getType()方法中放置了一条日志,但它从未被打印出来。我正在使用Notepad示例代码。请解释Java文档注释的第一行。从getType()返回null也可以正常工作。getType()方法的目的是什么?
/**
* This is called when a client calls {@link android.content.ContentResolver#getType(Uri)}.
* Returns the MIME data type of the URI given as a parameter.
*
* @param uri The URI whose MIME type is desired.
* @return The MIME type of the URI.
* @throws IllegalArgumentException if the incoming URI pattern is invalid.
*/
@Override
public String getType(Uri uri)
{
Log.d("Suparna", "******getType()");
/*switch(uriMatcher.match(uri))
{
// ---get all books---
case BOOK_DETAILS:
return Book.Book_Details.CONTENT_TYPE;
// ---get a particular book---
case BOOK_DETAILS_ID:
return Book.Book_Details.CONTENT_ITEM_TYPE;
default:
throw new IllegalArgumentException("Unsupported URI: " + uri);
}*/
return null;
}