Question

我正在尝试使用Android共享偏好设置来保存某些应用值这是我的onCreate的代码：

protected void onCreate(Bundle savedInstanceState) {

    SharedPreferences preferences = getSharedPreferences("MyPref", MODE_PRIVATE);
    boolean firstLaunch = preferences.getBoolean("firstlaunch", true);

    System.out.println("FIRST LAUNCH? " + firstLaunch);

    if(firstLaunch == true){
        SharedPreferences.Editor editor = getSharedPreferences("MyPref", MODE_PRIVATE).edit();
        editor.putString("language", "en");
        editor.putInt("theme", R.style.Default);
        editor.putBoolean("firstLaunch", false);
        editor.commit();
        System.out.println("FIRST LAUNCH:" + preferences.getBoolean("firstLaunch", true));
    }

当我重新启动应用时，firstLaunch仍然是真的吗？这是为什么？

Answer 1

您遇到了个案问题。 firstlaunch vs firstLaunch

要避免此类问题，您应该使用静态成员。

private static final String KEY_PREFS_NAME = "myPrefs";
private static final String KEY_FIRST_LAUNCH = "firstLaunch";

protected void onCreate(Bundle savedInstanceState) {

SharedPreferences preferences = getSharedPreferences(KEY_PREFS_NAME, MODE_PRIVATE);
boolean firstLaunch = preferences.getBoolean(KEY_FIRST_LAUNCH, true);

System.out.println("FIRST LAUNCH? " + firstLaunch);

if(firstLaunch == true){
    SharedPreferences.Editor editor = getSharedPreferences(KEY_PREFS_NAME, MODE_PRIVATE).edit();
    editor.putString("language", "en");
    editor.putInt("theme", R.style.Default);
    editor.putBoolean(KEY_FIRST_LAUNCH, false);
    editor.commit();
    System.out.println("FIRST LAUNCH:" + preferences.getBoolean(KEY_FIRST_LAUNCH, true));
}

Answer 2

检索密钥时，您的密钥值拼写不正确，因此您总是会def bettingRoundHuman(): print "Human, your cards are: " + str(human.card1) + ", " + str(human.card2) action = raw_input("What is your move? (r/c/f): ") if action == 'f': ai.score = ai.score + 1 Table.winner = "Ai" bettingRound().won = True return True elif action == 'r': raiseAmount = input("Raise by: ") if bettingRoundHuman().action == 'r': human.money = human.money - bettingRoundAi().raiseAmount - raiseAmount Table.pot = Table.pot + bettingRoundAi().raiseAmount + raiseAmount bettingRound().won = False return False elif bettingRoundHuman().action == 'c': human.money = human.money - raiseAmount Table.pot = Table.pot + raiseAmount bettingRound().won = False return False else: human.money = human.money - raiseAmount Table.pot = Table.pot + raiseAmount bettingRound().won = False return False elif action == 'c': if bettingRoundAi().action == 'c': bettingRound().won = False return True elif bettingRoundAi().action == 'r': human.money = human.money - bettingRoundAi().raiseAmount Table.pot = Table.pot + bettingRoundAi().raiseAmount bettingRound().won = False return False else: bettingRound().won = False return False def bettingRoundAi(): print "Ai, your cards are: " + str(ai.card1) + ", " + str(ai.card2) action = raw_input("What is your move? (r/c/f): ") if action == 'f': human.score = human.score + 1 Table.winner = 'Human' bettingRound().won = True return True elif action == 'r': raiseAmount = input("Raise by: ") if bettingRoundHuman().action == 'r': ai.money = ai.money - bettingRoundHuman().raiseAmount - raiseAmount Table.pot = Table.pot + bettingRoundHuman().raiseAmount + raiseAmount bettingRound().won = False return False elif bettingRoundHuman().action == 'c': ai.money = ai.money - raiseAmount Table.pot = Table.pot + raiseAmount bettingRound().won = False return False elif action == 'c': if bettingRoundHuman().action == 'r': ai.money = ai.money - bettingRoundHuman().raiseAmount Table.pot = Table.pot + bettingRoundHuman().raiseAmount bettingRound().won = False return False elif bettingRoundHuman().action == 'c': bettingRound().won = False return True else: bettingRound().won = False return False def playGame(): startPlayer = bettingRoundOrder() human.money = human.money - Table.entrymoney ai.money = ai.money - Table.entrymoney Table.pot = (Table.pot + 2*Table.entrymoney) if bettingRound() == False: print "The table's cards are: " + str(Table.flop1) + ", " + str(Table.flop2) + ", " + str(Table.flop3) if bettingRound() == False: print "The table's cards are: " + str(Table.flop1) + ", " + str(Table.flop2) + ", " + str(Table.flop3) + ", " + str(Table.turn) if bettingRound() == False: print "The table's cards are: " + str(Table.flop1) + ", " + str(Table.flop2) + ", " + str(Table.flop3) + ", " + str(Table.turn) + ", " + str(Table.river) if bettingRound() == False: return cardCompare() else: return Table.winner def bettingRoundOrder(): if randint(0,100) >= 50: return 1 else: return 2 def bettingRound(): won = False if playGame().startPlayer == 1: while flag == False: finishH = bettingRoundHuman() finishA = bettingRoundAi() if finishH == True or finishA == True: flag = True else: flag = False elif playGame().startPlayer == 2: while flag == False: finishA = bettingRoundAi() finishH = bettingRoundHuman() if finishH == True or finishA == True: flag = True else: flag = flase if won == True: return True else: return False进行更改，并且您提交了错误的密钥。

更改

[Keeps repeating and too long to put in question]
  File "/home/laurence/Documents/poker (test).py", line 180, in bettingRound
    if playGame().startPlayer == 1:
  File "/home/laurence/Documents/poker (test).py", line 162, in playGame
    if bettingRound() == False:
  File "/home/laurence/Documents/poker (test).py", line 180, in bettingRound
    if playGame().startPlayer == 1:
  File "/home/laurence/Documents/poker (test).py", line 162, in playGame
    if bettingRound() == False:
  File "/home/laurence/Documents/poker (test).py", line 180, in bettingRound
    if playGame().startPlayer == 1:
  File "/home/laurence/Documents/poker (test).py", line 157, in playGame
    startPlayer = bettingRoundOrder()
  File "/home/laurence/Documents/poker (test).py", line 173, in bettingRoundOrder
    if randint(0,100) >= 50: 
  File "/usr/lib/python2.7/random.py", line 242, in randint
    return self.randrange(a, b+1)
  File "/usr/lib/python2.7/random.py", line 185, in randrange
    istart = _int(start)
RuntimeError: maximum recursion depth exceeded while calling a Python object

到

true

Android共享偏好设置无法正常保存

2 个答案: