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Unlike file storage, SharedPreferences uses key-value pairs to store data

That is to say, when saving a piece of data, you need to provide a corresponding key to the data, so that when reading the data, you can use this key to read the corresponding value.

And SharedPrefencese also supports a variety of different data type storage. If the stored data type is an integer, then the extracted data is an integer, and if it is String, then it is also String.

It is obvious that it is more convenient to use SharedPreferences.

The following steps are required to store data to ShraedPreferences

Get the SharedPreferences object

Get the Editor object of the SharedPreferences object

Call the method of the Editor object to add data to the file

Submit data to complete storage operation

There are three ways to get a SharedPereferences object

Call the getSharedPreferences () method of the Context class

SharedPreferences p=getSharedPreferences ("myPeferecences", MODE_PRIVATE)

The first parameter in getSharedPereferences is the file name, and the second parameter is the operation mode. The default is MODE_PRIVATE (private file).

Call getPrefecences in Activity

SharedPreferences p=getPreferences (MODE_PRIVATE)

GetPreferences defaults to the name of the currently active class as the name of the SharedPreferences file.

Call the getDefaultSharedPreferences of the PreferencesManager class

SharedPreferences p=getDefaultSharedPreferences (this)

Its parameters are in the context, and the currently applied package is taken as the name of the SharedPerefences file by default

Get the Editor object of SharedPreferences

SharedPreferences.Editor=p.edit ()

Call the method of the Editor object to add data to the file

Editor.putString ("username", "adming"); editor.putInt ("id", 123)

Submit data to complete storage operation

Editor.apply ()

At this point, the whole SharedPreferences stored procedure is completed, and when we want to use it, we can use the getXXX method to take it out.

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