[Android] SharedPreferences

private void getPreferences() { 
        SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE); 
        String a = pref.getString("key1", ""); 
        Toast.makeText(this, a, 0).show(); 
    } 
  
    // 값 저장하기 
    private void savePreferences() { 
        SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE); 
        SharedPreferences.Editor editor = pref.edit(); 
        editor.putString("key1", "data"); 
        editor.commit(); 
    } 
  
    // 값(Key Data) 삭제하기 
    private void removePreferences() { 
        SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE); 
        SharedPreferences.Editor editor = pref.edit(); 
        editor.remove("key1"); 
        editor.commit(); 
    } 
  
    // 값(ALL Data) 삭제하기 
    private void removeAllPreferences() { 
        SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE); 
        SharedPreferences.Editor editor = pref.edit(); 
        editor.clear(); 
        editor.commit(); 
    }

Activity가 아닌 다른 class에서 사용하려면, context만 넘겨주면 된다

SharedPreferences pref = mContext.getSharedPreferences("pref", MODE_PRIVATE);