SharedPreferenceHelper.java

public class AppPref {

    private static final String SETTINGS_NAME = "com.example.shakil.finalproject.appsettings";
    private static AppPref sSharedPrefs;
    private SharedPreferences mPref;
    private SharedPreferences.Editor mEditor;



    public enum Key {
        /* Recommended naming convention:
         * ints, floats, doubles, longs:
         * SAMPLE_NUM or SAMPLE_COUNT or SAMPLE_INT, SAMPLE_LONG etc.
         *
         * boolean: IS_SAMPLE, HAS_SAMPLE, CONTAINS_SAMPLE
         *
         * String: SAMPLE_KEY, SAMPLE_STR or just SAMPLE
         */
        SAMPLE_STR,
        SAMPLE_INT,
        IS_DEVICE_IS_LOCKED,
        USER_LOGIN
        
        
    }

    private AppPref(Context context) {
        mPref = context.getSharedPreferences(SETTINGS_NAME, Context.MODE_PRIVATE);
    }


    public static AppPref getInstance(Context context) {
        if (sSharedPrefs == null) {
            sSharedPrefs = new AppPref(context.getApplicationContext());
        }
        return sSharedPrefs;
    }


    public void put(Key key, String val) {
        doEdit();
        mEditor.putString(key.name(), val);
        doCommit();
    }

    public void put(Key key, int val) {
        doEdit();
        mEditor.putInt(key.name(), val);
        doCommit();
    }

    public void put(Key key, boolean val) {
        doEdit();
        mEditor.putBoolean(key.name(), val);
        doCommit();
    }

    public void put(Key key, float val) {
        doEdit();
        mEditor.putFloat(key.name(), val);
        doCommit();
    }
    
    public void put(Key key, long val) {
        doEdit();
        mEditor.putLong(key.name(), val);
        doCommit();
    }

    public void put(Key key, double val) {
        doEdit();
        mEditor.putString(key.name(), String.valueOf(val));
        doCommit();
    }
    
    
    
    
    
    
    

    public String getString(Key key, String defaultValue) {
        return mPref.getString(key.name(), defaultValue);
    }

    public String getString(Key key) {
        return mPref.getString(key.name(), null);
    }

    public int getInt(Key key) {
        return mPref.getInt(key.name(), 0);
    }

    public int getInt(Key key, int defaultValue) {
        return mPref.getInt(key.name(), defaultValue);
    }

    public long getLong(Key key) {
        return mPref.getLong(key.name(), 0);
    }

    public long getLong(Key key, long defaultValue) {
        return mPref.getLong(key.name(), defaultValue);
    }

    public float getFloat(Key key) {
        return mPref.getFloat(key.name(), 0);
    }

    public float getFloat(Key key, float defaultValue) {
        return mPref.getFloat(key.name(), defaultValue);
    }

    
    public boolean getBoolean(Key key, boolean defaultValue) {
        return mPref.getBoolean(key.name(), defaultValue);
    }

    public boolean getBoolean(Key key) {
        return mPref.getBoolean(key.name(), false);
    }

    public double getDouble(Key key) {
        return getDouble(key, 0);
    }

    public double getDouble(Key key, double defaultValue) {
        try {
            return Double.valueOf(mPref.getString(key.name(), String.valueOf(defaultValue)));
        } catch (NumberFormatException nfe) {
            return defaultValue;
        }
    }


    public void putUser(Key key,UserInfo user) {
        Gson gson = new Gson();
        String json = gson.toJson(user);
        doEdit();
        put(key,json);
        doCommit();
    }



    public  UserInfo getUser(Key key) {
        Gson gson = new Gson();
        String json = mPref.getString(key.name(),null);
        if(json != null) {
            UserInfo obj = gson.fromJson(json, UserInfo.class);
            return obj;
        }
        return null;
    }
    
    
    
    
    public void remove(Key... keys) {
        doEdit();
        for (Key key : keys) {
            mEditor.remove(key.name());
        }
        doCommit();
    }

    
    public void clear() {
        doEdit();
        mEditor.clear();
        doCommit();
    }

    

    private void doEdit() {
        if (mEditor == null) {
            mEditor = mPref.edit();
        }
    }

    private void doCommit() {
        if (mEditor != null) {
            mEditor.commit();
            mEditor = null;
        }
    }
}