Question

我正在尝试将简单的Highscore保存到我的游戏中，但数据不会保存到共享首选项。

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;

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,
    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);

    //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 ;
}
}

我使用以下功能保存我的高分：

public void highscoreSaver() {
    SharedPrefManager.LoadFromPref();
    if(finalScore > SharedPrefManager.getHighScore()) {
        SharedPrefManager.SetHighScore(finalScore);             
        SharedPrefManager.StoreToPref();
        }

}

获得这样的高分：

HighScore = SharedPrefManager.getHighScore();

我做错了什么吗？请让我知道

Answer 1

我认为问题在于settings.getInt("HighScore", HighScore);
根据文档here，SharedPreferences.getInt(String, int)返回一个整数，第二个参数用于在给定键没有首选项时给出默认值，因此您应该执行类似HighScore = settings.getInt("HighScore", 0);的操作

高分仍未保存到共享首选项

1 个答案: