Understand the basic concept of datastore in Android kotlin and why SharedPreferences should be stopped in Android

stay Android Store a small amount of data in , Such as telephone number 、 Name or person, etc .Android Used by developers SharedPreferencesAPI. But for security and asynchronous transactions , Google suggests using DataStore .

SharedPreferences

these SharedPreferencesAPIdata For reading and writing stored in Android Based on XML Key value pairs in the file of .SharedPreferences Allow application developers to store small amounts of data , Such as String、Int、Long、Double etc. , Used for configuration 、 Settings, etc . You can still go through Place complex custom class objects ,Serializable But this is not usually recommended .

In order to use it , First you need to get an instance ,SharedPreferences Then you can use get*() The method in the following example reads data .

val preferences = this.getSharedPreferences("SOME_NAME", Context.MODE_PRIVATE)

// Reading the values from Preferences
val myStr = preferences.getString("myStrKey", "DEFAULT_STR")
val myLong = preferences.getLong("myLongKey", 0)
val myInt = preferences.getInt("myIntKey", 1)
val myDouble = preferences.getDouble("myDoubleKey", 0.0)

Or you can visit SharedPreferences.Editor Objects and calls put*() Method to write a value , Finally, you can commitorapply() Method to save these changes .