添加偏好设置

Question

我想知道如何在android中添加2个偏好值？即考虑一个游戏中有硬币来获得生命，并说用户选择不使用该硬币并再次开始游戏。现在让我们说他有更多的硬币。所以我的问题是如何添加旧的未使用的硬币+新获得的硬币？

Answer 1

您可以使用SharedPreferences作为

写入共享偏好使用：

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

，并从共享偏好阅读使用方法：

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(); 

可以说用户在这里留下5个硬币。现在你使用while循环是这样的：

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--; 
}