安装者和获得者的信息

Question

我正在广泛地学习有关获取者和安装者的知识，但我似乎没有按照自己的方式。 我有一个名为Apps_Info的类，其中包含我的setters和getters，我有我的主要活动FavouriteApps，它有一个使用Apps_Info类的列表。
我想从FavouriteApps列表中获取包的名称，但我仍然收到null。
请有人可以告诉该怎么办？下面是这个命令的代码：类Apps_Info和FavouriteApps活动

public class Apps_Info { 
    private Bitmap bIcon; 
    private String sName; 
    private String sPacks_Name; 

    public Apps_Info(Bitmap icon, String name, String Packs_Name) { 
     bIcon = icon; 
     sName = name; 
     sPacks_Name = Packs_Name; 
    } 

    public void setIcon(Bitmap icon) { 
     bIcon=icon; 
    } 

    public Bitmap getIcon() { 
     return bIcon; 
    } 

    public void setName(String name) { 
     sName=name; 
    } 

    public String getName() { 
     return sName; 
    } 

    public void setPacks_Name(String Packs_Name) { 
     this.sPacks_Name=Packs_Name; 
    } 

    public String getPacks_Name() { 
     return sPacks_Name; 
    } 
} 

FavouriteApps活动代码（部分）

String packname, packsname, apps_names; 
Bitmap app_icon; 
Resources res = getResources(); 
List<Apps_Info> ListApps_Info = new ArrayList<Apps_Info>(); 
ListApps_Info.add(new Apps_Info(BitmapFactory.decodeResource(res, R.drawable.browser_app), "Browser", "com.browser")); 
ListApps_Info.add(new Apps_Info(BitmapFactory.decodeResource(res, R.drawable.clock_app), "Alarm Clock", "com.alarm.clock")); 
ListApps_Info.add(new Apps_Info(BitmapFactory.decodeResource(res, R.drawable.threegplus), "3G Secure Connection", "threeg.secureconnect")); 

mGridView.setAdapter(new Apps_Info_Adapter(this, ListApps_Info)); 
Apps_Info packinfo = new Apps_Info(app_icon, apps_names, packname); 
packsname = packinfo.getPacks_Name(); 
apps_names = packinfo.getName(); 
Log.i("The Pack_Name is " + packsname, "Pack Name"); 

Answer 1

你应该这样做。

for (int i = 0; i < ListApps_Info.size(); i++) { 
    Apps_Info packinfo = ListApps_Info.item(i); 
    packsname = packinfo.getPacks_Name(); 
    apps_names = packinfo.getName(); 
    Log.i("The Pack_Name is " + packsname, "Pack Name"); 
} 

Answer 2

这是因为你在初始化代码中packname变量。

String packname,packsname,apps_names; 

当你这样做：

Apps_Info packinfo=new Apps_Info(app_icon, apps_names,packname); 
packsname=packinfo.getPacks_Name(); 

你吸气时做得很好，这是正常的，如果返回null。