共享preferences.getBoolean返回true，每次 [英] SharedPreferences.getBoolean returns true everytime

问题描述

我做了一个类来处理重要数据的变化，如App Purchase的状态和其他的东西。

有关这一目标，我创建了一个类，它是否值的设置和阅读。但问题是，每当我所说的appIsPurchased（）方法，而它hasen't以来安装的应用程序和它的第一个首次推出改变了，结果是真实的。

这是我的code：

  / **
 *创建者neemasa于14年5月29日。
 *此类处理应用程序中比较关键的数据值。
 * /
公共类AppCore {    私人共享preferences设置;
    私人字符串keyPurchase =app_purchased;
    私人上下文的背景下;    公共AppCore（上下文的背景下）{
        this.context =背景;
        设置= preferenceManager.getDefaultShared preferences（背景）;
    }    公共无效setAppInPurchasedMode（字符串状态）{
        如果（status.equals（成功））{
            。settings.edit（）putBoolean（keyPurchase，真）.commit（）;
        }否则如果（status.equals（失败））{
            。settings.edit（）putBoolean（keyPurchase，FALSE）.commit（）;
        }    }
    公共布尔appIsPurchased（）{
        布尔购买= FALSE;
        如果（settings.getBoolean（keyPurchase，真））{
            购买= TRUE;
        }
        返回购买;
    }}
 

---

问题1：是有什么错我的code？如果有，那么为什么appIsPurchased（）始终返回true？

第二个问题：做共享preferences默认情况下真正的全值？

---

此外，当我使用这个类在我的code敬酒购买！运行，即使应用程序正在运行的第一次。

  @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;        AppCore appCore =新AppCore（getApplicationContext（））;
        如果（appCore.appIsPurchased（））{
            Toast.makeText（getApplicationContext（），购买！，Toast.LENGTH_SHORT）.show（）;
        }其他{
            Toast.makeText（getApplicationContext（），没有购买！，Toast.LENGTH_SHORT）.show（）;
        }
}
 

解决方案

找到了，问题是，我想

  settings.getBoolean（keyPurchase，FALSE）
 

返回keyPurchased变量的值，但事实上它只返回变量本身没有它的价值，所以我改变我类的方法来修复这个问题：

 公共布尔appIsPurchased（）{
    返回settings.getBoolean（keyPurchase，FALSE）;
}
 

I made a class for handling important data changes such as App Purchase Status and other stuff .

For this goal I have created a class which does the setting and reading of the values. but the problem is whenever I call the appIsPurchased() method, the result is true while it hasen't been changed since app installation and its first initial launch.

This is my code:

/**
 * Created by neemasa on 5/29/14.
 * This class handles more crucial data values within app.
 */
public class AppCore {

    private SharedPreferences settings;
    private String keyPurchase = "app_purchased";
    private Context context;

    public AppCore(Context context){
        this.context = context;
        settings = PreferenceManager.getDefaultSharedPreferences(context);
    }

    public void setAppInPurchasedMode(String status){
        if (status.equals("successful")){
            settings.edit().putBoolean(keyPurchase, true).commit();
        }else if (status.equals("failed")){
            settings.edit().putBoolean(keyPurchase, false).commit();
        }

    }
    public boolean appIsPurchased(){
        boolean purchased = false;
        if (settings.getBoolean(keyPurchase,true)){
            purchased = true;
        }
        return purchased;
    }

}

---

Question 1st: is there something wrong with my code? if there is then why appIsPurchased() always return true?
Question 2nd: do all values in the shared preferences are true by default?

---

Meanwhile when I use this class in my code the toast "Purchased!" runs even when app is running for the first time.

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AppCore appCore = new AppCore(getApplicationContext());
        if (appCore.appIsPurchased()){
            Toast.makeText(getApplicationContext(),"Purchased!",Toast.LENGTH_SHORT).show();
        }else {
            Toast.makeText(getApplicationContext(),"Not Purchased!",Toast.LENGTH_SHORT).show();
        }
}

解决方案

Found It, the problem is that I was thinking

settings.getBoolean(keyPurchase,false) 

returns the value of keyPurchased variable but the fact is it only returns the variable itself not its value so I fixed the problem by changing the method of my class to this:

public boolean appIsPurchased(){
    return settings.getBoolean(keyPurchase,false);
}

这篇关于共享preferences.getBoolean返回true，每次的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！