我正在使用共享首选项为我的游戏制作高分脚本。显然,我希望这些数据仅保存在安装它的手机上。我已完成以下操作,并且高分显示并更新,但是当我关闭应用程序并重新打开它时,它会重置。
if(finalScore > SharedPrefManager.getHighScore())
SharedPrefManager.SetHighScore(finalScore);
SharedPrefManager.StoreToPref();
SharedPrefManager.java:
package com.divergent.thumbler;
import android.content.Context;
import android.content.SharedPreferences;
// all methods are static , so we can call from any where in the code
//all member variables are private, so that we can save load with our own fun only
public class SharedPrefManager {
//this is your shared preference file name, in which we will save data
public static final String MY_EMP_PREFS = "MySharedPref";
//saving the context, so that we can call all
//shared pref methods from non activity classes.
//because getSharedPreferences required the context.
//but in activity class we can call without this context
private static Context mContext;
// will get user input in below variables, then will store in to shared pref
private static int HighScore = 0;
public static void Init(Context context)
{
mContext = context;
}
public static void LoadFromPref()
{
SharedPreferences settings = mContext.getSharedPreferences(MY_EMP_PREFS, 0);
// Note here the 2nd parameter 0 is the default parameter for private access,
//Operating mode. Use 0 or MODE_PRIVATE for the default operation,
HighScore = settings.getInt("HighScore", HighScore);
}
public static void StoreToPref()
{
// get the existing preference file
SharedPreferences settings = mContext.getSharedPreferences(MY_EMP_PREFS, 0);
//need an editor to edit and save values
SharedPreferences.Editor editor = settings.edit();
editor.putInt("HighScore", HighScore); // Age is the key and mAge is holding the value
//final step to commit (save)the changes in to the shared pref
editor.commit();
}
public static void DeleteSingleEntryFromPref(String keyName)
{
SharedPreferences settings = mContext.getSharedPreferences(MY_EMP_PREFS, 0);
//need an editor to edit and save values
SharedPreferences.Editor editor = settings.edit();
editor.remove(keyName);
editor.commit();
}
public static void DeleteAllEntriesFromPref()
{
SharedPreferences settings = mContext.getSharedPreferences(MY_EMP_PREFS, 0);
//need an editor to edit and save values
SharedPreferences.Editor editor = settings.edit();
editor.clear();
editor.commit();
}
public static void SetHighScore(int score)
{
HighScore = score;
}
public static int getHighScore()
{
return HighScore ;
}
}
最佳答案
最好不要在 sharedpreference
中存储敏感信息。所有拥有 root 权限的用户都可以查看并轻松编辑您的共享首选项
(如果未加密)。因此,不要忘记加密所有数据。
这是您需要存储在sharedpreference
中的代码块
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("finalScore", yourscore);
editor.commit();
更新
您正在设置为
editor.putInt("HighScore", HighScore);
并得到
HighScore = settings.getInt("Age",0);
您应该使用相同的标签
更新
改变
HighScore = settings.getInt("HighScore", HighScore);
到
settings.getInt("HighScore", HighScore);
关于java - 使用共享首选项保存永久数据?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24109971/