Question

我正在开发一个应用程序，显示与正在绘制的卡相关的规则。用户可以在SettingsActivity中设置自定义规则，并将其加载到GameActivity中。

这没有问题，但是，如果用户决定更改其规则或重置为默认值，则GameActivity中更新此选项的唯一方法是完全退出应用程序并重新启动。我尝试过使用reCreate()，但它没有用。当我使用finish()时，它就完全退出了应用程序。

在GameActivity中，我也尝试在onResume()方法中调用loadRules方法，但它没有做任何事情。

从SettingsActivity剪下的代码：

public void setDefault(View v){

ruleAce = rules[0];
ruleTwo = rules[1];
ruleThree = rules[2];
ruleFour = rules[3];
ruleFive = rules[4];
ruleSix = rules[5];
ruleSeven = rules[6];
ruleEight = rules[7];
ruleNine = rules[8];
ruleTen = rules[9];
ruleJack = rules[10];
ruleQueen = rules[11];
ruleKing = rules[12];

saveRules();

}

private void saveRules(){

SharedPreferences ace, two, three, four, five, six, seven, eight, nine, ten, jack, queen, king;

SharedPreferences.Editor editor;
ace = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = ace.edit();
editor.putString(RULE_ACE, ruleAce);
editor.apply();

two = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = two.edit();
editor.putString(RULE_TWO, ruleTwo);
editor.apply();

three = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = three.edit();
editor.putString(RULE_THREE, ruleThree);
editor.apply();

four = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = four.edit();
editor.putString(RULE_FOUR, ruleFour);
editor.apply();

five = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = five.edit();
editor.putString(RULE_FIVE, ruleFive);
editor.apply();

six = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = six.edit();
editor.putString(RULE_SIX, ruleSix);
editor.apply();

seven = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = seven.edit();
editor.putString(RULE_SEVEN, ruleSeven);
editor.apply();

eight = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = eight.edit();
editor.putString(RULE_EIGHT, ruleEight);
editor.apply();

nine = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = nine.edit();
editor.putString(RULE_NINE, ruleNine);
editor.apply();

ten = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = ten.edit();
editor.putString(RULE_TEN, ruleTen);
editor.apply();

jack = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = jack.edit();
editor.putString(RULE_JACK, ruleJack);
editor.apply();

queen = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = queen.edit();
editor.putString(RULE_QUEEN, ruleQueen);
editor.apply();

king = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
editor = king.edit();
editor.putString(RULE_KING, ruleKing);
editor.apply();

}

GameActivity代码段：

public class kingGame extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_king_game);

loadRules();

shuffleDeck();
}

@Override
protected void onResume(){
super.onResume();
setContentView(R.layout.activity_king_game);

loadRules();
}

//Sets the Rules
static String aceRule, twoRule, threeRule, fourRule, fiveRule, sixRule, sevenRule, eightRule, nineRule, tenRule, jackRule, queenRule, kingRule;
static String[] defaultrules = {DEFAULT RULES IN HERE}

public void loadRules(){

SharedPreferences settings;
settings = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);


aceRule = settings.getString(RULE_ACE, defaultrules[0]);
twoRule = settings.getString(RULE_TWO, defaultrules[1]);
threeRule = settings.getString(RULE_THREE, defaultrules[2]);
fourRule = settings.getString(RULE_FOUR, defaultrules[3]);
fiveRule = settings.getString(RULE_FIVE, defaultrules[4]);
sixRule = settings.getString(RULE_SIX, defaultrules[5]);
sevenRule = settings.getString(RULE_SEVEN, defaultrules[6]);
eightRule = settings.getString(RULE_EIGHT, defaultrules[7]);
nineRule = settings.getString(RULE_NINE, defaultrules[8]);
tenRule = settings.getString(RULE_TEN, defaultrules[9]);
jackRule = settings.getString(RULE_JACK, defaultrules[10]);
queenRule = settings.getString(RULE_QUEEN, defaultrules[11]);
kingRule = settings.getString(RULE_KING, defaultrules[12]);

}
/* Creates the Deck */

/* Shuffles the Deck */
public void shuffleDeck(){

cardsLeft = 52;
cardNum = 0;

for (int i = 0; i < RANK.length; i++){
    for (int j=0; j < SUITS.length; j++){
        deck[SUITS.length*i + j] = RANK[i] + " Of " + SUITS[j];
    }
}

for (int i = 0; i < n; i++){
    int r = i + (int) (Math.random() * (n-i));
    String temp = deck[r];
    deck[r] = deck[i];
    deck[i] = temp;
}
}

/* Button Press Draws the Card */
public void drawCard(View view) {}

之后，它只是printCard()，showRule()和newGame()的方法。

只有在游戏结束时（到达牌组的末尾）才会调用newGame。

showRule只显示加载到aceRule，twoRule等中的规则，以响应绘制的卡片。

printCard显示抽出的卡片。

所以我的问题是，当活动恢复时，如何强制GameActivity检查SharedPreferences中的更改？

Answer 1

在onPause方法中，您可以使用.edit（）。putX（）。apply（）对共享的prefs对象保存值

只有在重置应用后，SharedPreferences才会更新？

1 个答案: