Android app Development sharedpreferences How to use stored data

1, Sharedpreferences is the most easily understood data storage technology in Android, in fact sharedpreferences processing is a key-value (key value pair). Sharedpreferences is often used to store some lightweight data

public void Setsharevalue () {

Instantiate the Sharedpreferences object (the first step) to the name of the local XML file---Test

Sharedpreferences mysharedpreferences = getsharedpreferences ("Test", activity.mode_private);

Instantiate the Sharedpreferences.editor object (step two) Sharedpreferences.editor Editor = Mysharedpreferences.edit ();

Save the data in a putstring way

Editor.putstring ("name", "Tom");

Editor.putstring ("password", "123");

Submit Current Data editor.commit ();

To write data successfully using the TOAST information hint box

Toast.maketext (This, "data successfully written to sharedpreferences! ", Toast.length_long). Show ();

}

2, execute the above code, Sharedpreferences will save this data in the Test.xml file, you can export the file under File Explorer Data/data, and view. So how do you read the data that has been stored? Let's see.

public void Getsharevalue () {

Similarly, an Sharedpreferences object is instantiated before reading sharedpreferences data

Gets the local XML file name---Test

Sharedpreferences sharedpreferences = getsharedpreferences ("Test", activity.mode_private);

Use the GetString method to get value, note that the 2nd parameter is the default value of value

String name = sharedpreferences.getstring ("name", "This value bit default value when name does not exist");

String habit = sharedpreferences.getstring ("password", "Default value when password does not exist");

Display information using the Toast Information prompt box

Toast.maketext (This, "read the data as follows:" + "\ n" + "name:" + name + "\ n" + "Password:" + habit, Toast.length_long). Show (); }

Android app Development sharedpreferences How to use stored data