Question

如果玩家第一次赢得该级别，我想要做的就是添加5个'硬币'。这就是我所拥有的。它在

之下

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_winroundactivity);
    **initialize();**
}

private void initialize(){

SharedPreferences coin = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    String newcoin = coin.getString("coin","");
    Double coinnum = 0.0;
    try {
        coinnum = Double.parseDouble(newcoin);
    } catch (NumberFormatException e) {
        **coinnum = 0;** // your default value
    }


    level = getSharedPreferences("level",Activity.MODE_PRIVATE);
    levelunlock = getSharedPreferences("levelunlock",Activity.MODE_PRIVATE);

    if (level.getString("level","").compareTo(levelunlock.getString("levelunlock","")) == 1) {
        levelunlock.edit().putString("levelunlock", (level.getString("level", ""))).apply();

        if (level.getString("level","").equals("2")){
            coin.edit().putString("coin",Double.toString(coinnum) + 5).apply();
            textviewcoinnum.setText(newcoin);
        }

    }

我发布了以下代码。所有归功于@tahsinRupam

Answer 1

请尝试以下代码：

if (level.getString("level","").equals("2")){
   String prevCoin =  sharedPreferences.getString("coin", "");
   Double newCoin = Double.parseDouble(prevCoin) + 5;
   coin.edit().putString("coin", Double.toString(newCoin)).apply();
   textviewcoinnum.setText(coin.getString("coin",""));
   //supposed to add 5 coins and set set the new value as text in a textView.
}

更新：要检查您是否拥有有效的双倍值，请执行以下操作：

Double coinnum = 0.0;
try {
   coinnum = Double.parseDouble(newcoin);
} catch (NumberFormatException e) {
   coinnum = 0; // your default value
}

如果您收到NumberFormatException，请检查您的logcat。希望这会有所帮助。

Answer 2

这是有效的代码。大部分功劳归功于@tahsinRupam

SharedPreferences coin = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    String newcoin = coin.getString("coin","");
    double coinnum;
    try {
        coinnum = Double.parseDouble(newcoin);
    }catch (NumberFormatException e) {
        coinnum = 0;
    }


    level = getSharedPreferences("level",Activity.MODE_PRIVATE);
    levelunlock = getSharedPreferences("levelunlock",Activity.MODE_PRIVATE);

    if (level.getString("level","").compareTo(levelunlock.getString("levelunlock","")) == 1) {
        levelunlock.edit().putString("levelunlock", (level.getString("level", ""))).apply();

        if (level.getString("level","").equals("2")){
            coinnum = coinnum + 5;
            coin.edit().putString("coin",(Double.toString((coinnum)))).apply();
            newcoin = coin.getString("coin","");
            textviewcoinnum.setText(newcoin);
        }

    }

将5添加到我的共享偏好中，并将其放入textview中

2 个答案: