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Occasionally you might need to store a file in a database. The usual approach is to save the file to disk and then update the record in the database that points to the corresponding file name. Android takes this protocol and automates it by defining a specific procedure for saving and retrieving these files. Android uses a convention where a reference to the file name is saved in a record with a reserved column name of _data. When a record is inserted into that table, Android returns the URI to the caller. Once you save the record using this mechanism, you also need to follow it up by saving the file in that location. To do this, Android allows ContentResolver to take the Uri of the database record and return a writable output stream. Behind the scenes, Android allocates an internal file and stores the reference to that file name in the _data field.

The first mode indicates that just a single query string needs to be stored and replayed when needed. The second mode indicates that there are two strings that the suggestion provider can save. One string is the query and the other is the description line that shows up in the suggestion display item. The SearchActivity is responsible for saving these when it is called to respond to queries. The SearchActivity would call the following method to store these items (we will cover this in greater detail when we discuss the search activity):

public void saveRecentQuery (String queryString, String line2);

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# Listappend example_list [0;0;0];; - : int list = [10; 20; 30; 40; 50; 60; 70; 80; 90; 0; 0; 0] # Listrev_append example_list [0;0;0];; - : int list = [90; 80; 70; 60; 50; 40; 30; 20; 10; 0; 0; 0] # let nlist = Listrev_append example_list [0;0;0] in Listrev_append nlist [0;0;0];; - : int list = [0; 0; 0; 10; 20; 30; 40; 50; 60; 70; 80; 90; 0; 0; 0] # Listconcat [example_list;example_list];; - : int list = [10; 20; 30; 40; 50; 60; 70; 80; 90; 10; 20; 30; 40; 50; 60; 70; 80; 90] # Listflatten [example_list;example_list];; - : int list = [10; 20; 30; 40; 50; 60; 70; 80; 90; 10; 20; 30; 40; 50; 60; 70; 80; 90] Lists can be iterated over, map d, and fold d.

If you were to extend the Notepad example to store an image for a given note, you could create an additional column called _data and run an insert first to get a URI back. The following code demonstrates this part of the protocol: ContentValues values = new ContentValues(); values.put("title", "New note"); values.put("note","This is a new note"); //Use a content resolver to insert the record ContentResolver contentResolver = activity.getContentResolver(); Uri newUri = contentResolver.insert(Notepad.Notes.CONTENT_URI, values); Once you have the URI of the record, the following code asks the ContentResolver to get a reference to the file output stream: . //Use the content resolver to get an output stream directly //ContentResolver hides the access to the _data field where //it stores the real file reference. OutputStream outStream = activity.getContentResolver().openOutputStream(newUri); someSourceBitmap.compress(Bitmap.CompressFormat.JPEG, 50, outStream); outStream.close(); The code then uses that output stream to write to.

The queryString is the string as typed by the user. This string will be displayed as the suggestion, and if the user clicks on the suggestion, this string will be sent to your searchable activity (as a new search query). Here is what the Android docs say about the line2 argument:

If you have configured your recent suggestions provider with DATABASE_MODE_2LINES, you can pass a second line of text here. It will be shown in a smaller font, below the primary suggestion. When typing, matches in either line of text will be displayed in the list. If you did not configure two-line mode, or if a given suggestion does not have any additional text to display, you can pass null here.

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