如何从一个Android的onCreate方法来访问这个变量？

问题描述

现在的问题是，我不能从onCreate方法内部访问的用户ID变量值。我访问来自两个不同的活动，活动的，所以我必须检查从中我来自哪里，我这样做，与由getDetailsUserId方法返回调用者，但值为0所有，即使用户id是一个类变量的时候

如果我初始化用户id与5，例如这是由getDetailsUserId方法的返回值...不是从onCreate方法的价值。

 公共类详情延伸活动{

    长的用户id;

    长getDetailsUserId（）{
        返回用户id; //这是变量值我不能。
    }

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_details）;
        getActionBar（）setDisplayHomeAsUpEnabled（真）。

        最后弦乐来电;

        //获取previous活动名称
        呼叫者= getIntent（）getStringExtra（com.mysite.myapp.Caller）;

        //获取用户ID，从名单
        如果（caller.equals（目录））{
            名单userListId =新名单（）;
            用户id = userListId.getUserListId（）;
        }

        //获取用户ID从个人得救
        否则如果（caller.equals（ProfileSaved））{
            ProfileSaved savedUserId =新ProfileSaved（）;
            用户id = savedUserId.getSavedUserId（）;
        }

}
 

解决方案

对不起，改变了我的previous答案。尝试过了，它为我工作。

这

 公共静态类的详细信息扩展活动{

   静态长期用户id;

    长getDetailsUserId（）{
        返回用户id; //这是变量值我不能。
    }

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.grid_layout）;
        getActionBar（）setDisplayHomeAsUpEnabled（真）。

        最后弦乐来电;

        //获取previous活动名称
        呼叫者= getIntent（）getStringExtra（com.mysite.myapp.Caller）;

        //获取用户ID，从名单
        如果（caller.equals（目录））{
            名单userListId =新名单（）;
            用户id = userListId.getUserListId（）;
        }

        //获取用户ID从个人得救
        否则如果（caller.equals（ProfileSaved））{
            ProfileSaved savedUserId =新ProfileSaved（）;
            this.userId = savedUserId.getSavedUserId（）;
        }

}

}
 

The problem is that I can't access the userId variable value from inside the onCreate method. I'm accessing the activity from two different activities so I have to check from which one I'm coming from, I do that with the caller but the value returned by the getDetailsUserId method is 0 all the time even though userId is a class variable.

If I initialize userId with 5 for example that's the value returned by the getDetailsUserId method... not the value from the onCreate method.

public class Details extends Activity {

    long userId;

    long getDetailsUserId(){
        return userId; //This is the variable value I can't get.
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_details);
        getActionBar().setDisplayHomeAsUpEnabled(true);

        final String caller;

        //Get previous activity name
        caller = getIntent().getStringExtra("com.mysite.myapp.Caller");

        //Get user id from "List"
        if(caller.equals("List")){
            List userListId = new List();
            userId = userListId.getUserListId();
        }

        //Get user id from "Profile Saved"
        else if(caller.equals("ProfileSaved")){
            ProfileSaved savedUserId = new ProfileSaved();
            userId = savedUserId.getSavedUserId();
        }

}

解决方案

Sorry, changed my previous answer. Tried it and it worked for me.

Here it is

public static class Details extends Activity {

   static long userId;

    long getDetailsUserId(){
        return userId; //This is the variable value I can't get.
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.grid_layout);
        getActionBar().setDisplayHomeAsUpEnabled(true);

        final String caller;

        //Get previous activity name
        caller = getIntent().getStringExtra("com.mysite.myapp.Caller");

        //Get user id from "List"
        if(caller.equals("List")){
            List userListId = new List();
            userId = userListId.getUserListId();
        }

        //Get user id from "Profile Saved"
        else if(caller.equals("ProfileSaved")){
            ProfileSaved savedUserId = new ProfileSaved();
            this.userId = savedUserId.getSavedUserId();
        }

}

}

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