我试图将SIM序列号存储为SharedPreferences中的值,但是当我做Toast以测试它为空的值时。Toast用于检索SharedPreferences返回空值
TelephonyManager tMgr=(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String ss = tMgr.getSimSerialNumber();
// Writing data to SharedPreferences
Editor editor = sp.edit();
editor.putString("serial", ss);
editor.commit();
String value = settings.getString("serial", "");
Toast.makeText(this, value, Toast.LENGTH_LONG).show();