What is Shared Preferences?
Shared Preferences in Android app development is a way to store and retrieve small amounts of data as key-value pairs.
It allows you to save simple data types such as strings, integers, and booleans to persistent storage that can be accessed throughout the app.
Here are some pros and cons of using Shared Preferences in Android app development:
Pros:
Easy to use: Shared Preferences are simple and easy to use. It is a lightweight storage mechanism and does not require complex setup or configuration.
Efficient: Shared Preferences provide a fast and efficient way to store and retrieve data.
Persistence: Shared Preferences store data persistently even when the app is closed, so data can be accessed across app sessions.
No external libraries: Shared Preferences is a part of the Android framework, so there is no need to include external libraries.
Cons:
Limited data storage: Shared Preferences are designed to store small amounts of data such as settings, preferences, and other simple values.
Not suitable for complex data: Shared Preferences are not suitable for storing complex data structures such as large lists or arrays.
Security concerns: Shared Preferences are not encrypted by default, so sensitive data should not be stored in them.
How to use?
Here's an example of how to use Shared Preferences in Android:
Create an instance of SharedPreferences:
SharedPreferences sharedPreferences = getSharedPreferences("my_preferences", MODE_PRIVATE);
Use SharedPreferences.Editor to add data:
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("key", "value");
editor.putInt("key2", 123);
editor.putBoolean("key3", true);
editor.apply();
Retrieve data from SharedPreferences:
String value = sharedPreferences.getString("key", "default_value");
int value2 = sharedPreferences.getInt("key2", 0);
boolean value3 = sharedPreferences.getBoolean("key3", false);
That's a brief overview of Shared Preferences in Android app development. I hope this helps!
Live Example:
MainActivity.java
Main Activity file to write logic and java code
activity_main.xml
In this .xml file we design the page and include the elements
Output:
