Sharp

#SharP

SharP wraps your SharedPreferences into a clean, type-safe Java interface. It uses annotation processing to generate the boilerplate code for you.

Just declare your interface and annotate it to be a @SharedPreference or a @DefaultSharedPreference:

@SharedPreference
interface LocalStorage{
  String getMyStringPreference();
  void setMyStringPreference(String value);
  int getMyIntPreference();
  void setMyIntPreference(int value);
}

...then instantiate its auto-generated implementation using SharP:

LocalStorage storage = SharP.getInstance(context, LocalStorage.class);

String myStringPreference = storage.getMyStringPreference();
int myIntPreference = storage.getMyIntPreference();

storage.setMyStringPreference("FooBar");
storage.setMyIntPreference(42);

That's it. No struggling with keys anymore.

Please refer to the Javadoc or the sample application for more information.

##Usage SharP is available via jcenter(). The android-apt plugin is used to setup SharP as annotation processor in Android Studio.

buildscript {
  repositories {
    jcenter()
  }
  dependencies {
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.6'
  }
}

apply plugin: 'com.neenbedankt.android-apt'

dependencies {
  compile 'de.ad:sharp-api:0.3.0'
  apt 'de.ad:sharp-processor:0.3.0'
}

##Principles In order to be lightweight and convenient SharP is designed according to the Convention over Configuration paradigm.

###Conventions ####Interface

• @DefaultSharedPreference:
• The default SharedPreferences are used calling PreferencesManager.getDefaultSharedPreferences(Context context)
• Use this if you want to access the stored preferences from PreferenceFragment
• @SharedPreference:
• Preferences are stored in their own file in MODE_PRIVATE
• The fully qualified interface name is used as unique filename
• Only top-level interfaces are supported

####Properties

• JavaBean naming conventions are applied
• Getters are required to:
• start with get and
• have no parameters
• Example: String getMyStringPreference();
• Boolean getters are required to:
• start with is
• have no parameters and
• must return boolean
• Example: boolean isMyBooleanPreference();
• Setters are required:
• to start with set
• have exactly one parameter
• must return void
• Example: void setMyStringPreference(String value);
• Each getters needs a corresponding setter
• Example: int getMyIntPreference() requires declaration of void setMyIntPreference(int value)

####Supported types

• SharP supports all types, but there is a twofold distinction:
• Native types (int, long, float, boolean and String)
• Custom types (any non native type)
• While native types are natively supported by SharedPreferences, custom types will be serialized/deserialized and treated as String

####Default values

• If a value has not been set yet, Java's default values are returned according to its type

####Specialities

• The declaration of void reset() in your interface will result in a special implementation which calls editor.clear().apply()