The biggest, yet clear, secret is that SharedPreferences are actually implemented using a
Anyway, SharedPreferences according to the android documentation
is a class that provides a general framework that allows you to save and retrieve persistent key-value pairs of primitive data types.Now let us take an example and try to mirror a database onto SharedPreferences.
Say, we have a utility app that allows you to surf the net, and one of the features is to add bookmarks. Technically, the user has an array of Urls which are the bookmarks.
On the first occasion, it would seem inconvenient to use Shared Preferences to save this array. However, it turns out that doing so is rather simple and to a very great extent has the same complexity of using a database.
An array representation boils down to an integer representing a size and
You could simply add a function setBookmarks that saves this array.
Not to lose generality I will show a function that will actually save an array and I will call it saveArray.
public boolean saveArray(String[] array, String arrayName, Context mContext) { SharedPreferences prefs = mContext.getSharedPreferences("preferencename", 0); SharedPreferences.Editor editor = prefs.edit(); editor.putInt(arrayName +"_size", array.length); for(int i=0;i<array.length;i++) editor.putString(arrayName + "_" + i, array[i]); return editor.commit(); }
Now to get the array back, we just do the reverse operation and lets call it loadArray
public String[] loadArray(String arrayName, Context mContext) { SharedPreferences prefs = mContext.getSharedPreferences("preferencename", 0); int size = prefs.getInt(arrayName + "_size", 0); String array[] = new String[size]; for(int i=0;i<size;i++) array[i] = prefs.getString(arrayName + "_" + i, null); return array; }
This whole implementation could actually be used to save a bit more complex classes.
Say that your Bookmark entity has an integer representing maybe the number of views.
The same approach can be made to save the whole data of the ith object.
a sort of serialization.
"SharedPreferences are actually implemented using a database" -- no, they are "actually implemented" using an XML file.
ReplyDeleteOOPS! you are right! I just rechecked. It seems I saw it once a long time and for some reason I thought it was a db. Anyway, everything still applies.
DeleteThank you Very much for the simple and straight forward solution .....
ReplyDeleteThanks very much for the explanation!
ReplyDeleteThe problem with this approach is that you'll pollute your preferences. Say, you save an array with 100 entries and then shrink it ito 2. You'll still have 100 entries in your preferences unless you clean it up first.
ReplyDeleteExactly you should clean up first before saving the array ( I will edit it when I have time )
DeleteHello and thanks for your post! A question: is a good way use this code for save 800 entries?
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I think the performance will be the same as the database if you tweak the data loading a bit.
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