A single class of shared preference which can store any type of data and objects at application level.
Example Code :
Shared Prefrence Class.
public class AppSharedPrefs{
private static AppSharedPrefs sharedPrefs = null;
private SharedPreferences sf;
public AppSharedPrefs(Context context)
{
sf = context.getSharedPreferences("key_shared_preference", Context.MODE_PRIVATE);
}
public static AppSharedPrefs getInstance(Context context)
{
if(sharedPrefs == null)
{
sharedPrefs = new AppSharedPrefs(context);
}
return sharedPrefs;
}
public Object get(String key)
{
Map<String, ?> map = sf.getAll();
return map.get((String)key);
}
public void put(String key, Object value)
{
SharedPreferences.Editor edit = sf.edit();
if(value == null)
{
edit.putString(key, null);
}
else if(value instanceof Boolean)
{
edit.putBoolean(key, (boolean)value);
}
else if(value instanceof Float)
{
edit.putFloat(key, (float)value);
}
else if(value instanceof Integer)
{
edit.putInt(key, (int)value);
}
else if(value instanceof Long)
{
edit.putLong(key, (long) value);
}
else if(value instanceof String)
{
edit.putString(key, (String)value);
}
else if(value instanceof Model)
{
edit.putString(key, (Model)value);
}
else if(value instanceof Set)
{
edit.putStringSet(key, (Set)value);
}
edit.commit();
}
public void clearAll()
{
sf.edit().clear().commit();
}
public void clear(String key)
{
sf.edit().remove(key).commit();
}
}
store various type of data in shared preference from any class as shown below.
public class RegisterActivity extends AppCompatActivity {
private AppSharedPrefs sharedPrefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
//initialise shared prefs manager
sharedPrefs = AppSharedPrefs.getInstance(RegisterActivity.this);
sharedPrefs.put("KeyName", "Zafar Imam");//stroing string value
sharedPrefs.put("KeyAge", 24); //storing integer value
sharedPrefs.put("IsRegister", true); //storing boolean value
ModelClass model = new ModelClass();
model.setFirstName("Zafar");
model.setLastName("Imam");
model.setRollNumber(512);
//here you can store object of model class inside prefrence to transfer from one class to other
sharedPrefs.put("Key_Serializable_Object", model);
}
}
Model class of getter and setter:
public class ModelClass implements Serializable {
private String firstName;
private String lastName;
private int rollNumber;
public int getRollNumber() {
return rollNumber;
}
public void setRollNumber(int rollNumber) {
this.rollNumber = rollNumber;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
Get the data from shared preference in other class as :
public class ProfileActivity extends AppCompatActivity {
ModelClass modelClass;
private AppSharedPrefs sharedPrefs;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.profile);
//initialise shared prefs manager
sharedPrefs = AppSharedPrefs.getInstance(ProfileActivity.this);
Boolean isRegister = (Boolean) sharedPrefs.get("IsRegister");//getting stored data
String name = (String) sharedPrefs.get("KeyName");//getting stored data
int age = (Integer) sharedPrefs.get("KeyAge");//getting stored data
modelClass = (ModelClass) sharedPrefs.get("Key_Serializable_Object");//getting object
if (isRegister){
String firstName = modelClass.getFirstName();
int rollNumber = modelClass.getRollNumber();
}
}
}
Note: for transferring Object from one class to other class, respected class(like ModelClass) must have implemented Serializable or Parcelable interface.
