Android: Data storage SharedPreferences and where to store files

 A simple primer on data storage SharedPreferences

Implementation process: Simply put, it is to save an XML file (k, v) in the form

getSharedPreferences("demo1", MODE_PRIVATE);

The first parameter is: the saved file name

The second parameter is: the saved data mode (mostly PRIVATE)

Here we give an example:

 SharedPreferences sp = getSharedPreferences("demo1", MODE_PRIVATE);
                ed_ip.setText(sp.getString("ip", ""));
                ed_port.setText(sp.getString("port", ""));

• The saved file name is demo1, and the mode is private
•  ed_ip and ed_port are text input boxes, set their text here
• Use getString() to get the value

 SharedPreferences.Editor editor = sp.edit();
                                editor.putString("ip", ed_ip.getText().toString());
                                editor.putString("port", ed_port.getText().toString());
                                editor.apply();

• Submit the value using putString() 
• Finally, pay attention to calling apply() to submit data

 Finally, let's look at where to save

Find the virtual machine file in the lower right corner

Data -> Data -> your package name -> shared_prefs -> file name

For example mine is: /data/data/com.example.myapplication/shared_prefs/demo1.xml

 

 

 Open it and you can see the XML file named demo1 created by getSharedPreferences("demo1", MODE_PRIVATE), the content is as follows (K, V)