Useful wrapper to simplify the android SharedPreference

SharedPrefer.java

/**
 *
 * Use tips
 *
 * --read some key-value
 * SharedPrefer.from(context)
 *             .open("com.meizu.flyme.meepo.SOME_SHARED_PREFERENCE")  // optional
 *             .read()
 *             .getXxx(KYE, DEFAULT_VALUE);
 *
 * --edit some key-value
 * SharedPrefer.from(context)
 *             .open("com.meizu.flyme.meepo.SOME_SHARED_PREFERENCE")  // optional
 *             .edit()
 *             .putAaa(aKey, aValue)
 *             .putBbb(bKey, bValue)
 *             .apply(); // or .commit();
 *
 * Created by Jween on 11/30/14.
 */
public class SharedPrefer {
    private Context mContext;

    private SharedPreferences sp;
    private SharedPreferences.Editor editor;

    private static final String DEFAULT_FILE_NAME =  "SharedPrefer";
    private String fileName = DEFAULT_FILE_NAME;


    private SharedPrefer(Context context){
        mContext = context;
    }

    public static SharedPrefer from(Context context) {
        return new SharedPrefer(context);
    }

    public SharedPreferences read() {
        if (sp == null) {
            sp = mContext.getSharedPreferences(fileName, 0);
        }
        return sp;
    }

    public SharedPrefer open(String fileName) {
        this.fileName = fileName;
        return this;
    }

    @SuppressLint("CommitPrefEdits")
    public SharedPreferences.Editor edit() {
        if (editor == null) {
            editor = read().edit();
        }
        return editor;
    }
}