我試圖將SIM序列號存儲爲SharedPreferences中的值,但是當我做Toast以測試它爲空的值時。Toast用於檢索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();