添加首选项值

Question

我想知道如何在 android 中添加 2 个偏好值？即考虑一个有硬币来获得生命的游戏，然后说用户选择不使用该硬币并再次开始游戏。现在假设他还有更多硬币。所以我的问题是如何添加旧的未使用硬币+新获得的硬币？

Answer 1

你可以使用SharedPreferences作为

要写入共享首选项，请使用：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.saved_high_score), newHighScore);
editor.commit();

要读取共享首选项，请使用：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
int defaultValue = getResources().getInteger(R.string.saved_high_score_default);
long highScore = sharedPref.getInt(getString(R.string.saved_high_score), defaultValue);

Answer 2

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
prefs.edit().putInt("lifecoin", 5).commit();

假设用户在这里留下了 5 个硬币。现在你使用这样的while循环：

int leftovercoin = 0;
try
{
    leftovercoin = prefs.getInt("lifecoin", 0);
}
catch(Exception e)
{
    Log.e("Error while getting shared pref", "Error while getting shared pref", e);
}
//add your new level's coins(5 of them) to the leftovercoins from last stage
leftovercoin = leftovercoin + 5; //here leftovercoin would be 10 because the shared preference has given it a value of 5 at first
while(leftovercoin>0)
{
      //spawn your coins here
      leftovercoin--;
}