onClickListener（按钮）使用片段切换ViewPager的看法 [英] onClickListener (buttons) to switch view of ViewPager using Fragments

问题描述

我开发一个应用程序，它包括一个具有三个片段一FragmentActivity的。我想从第一个片段去第三和最后一个下一步按钮。对于这一点，我使用的是viewPager和pagerAdpater（我禁用分页/刷卡上viewpager）。我的下一步按钮，在他们自己的碎片得到落实。我对每一个片段将一个XML布局，一个用于包含viewpager的fragmentActivity。

I'm developing an application, which consists of a FragmentActivity with three Fragments. I want to go from the first fragment to the third and last one with "next" buttons. For that, I'm using a viewPager and pagerAdpater (I disabled the paging/swiping on the viewpager). My "next" buttons have been implemented in their own fragments. I have one xml layout for each fragment and one for the fragmentActivity containing the viewpager.

我试图用一个OnClickListener在那里我可以用setCurrentItem（index）方法，并从第一个到最后一个视图。

I am trying to use an OnClickListener where I could use the setCurrentItem(index) method and go from the first to the last view.

问题是，我不知道我在哪里可以把OnClickListener，因为我没有在我的片段viewpager参考。

The problem is that i don't know where I could put the OnClickListener, since I don't have the viewpager reference in my fragment.

我怎样才能得到我的片段viewpager参考？我必须把我的OnClickListener方法别的地方？

How can I get the viewpager reference in my fragments? Do I have to put my OnClickListener method somewhere else?

下面是我的3个片段之一code：

Here is the code of one of my 3 Fragments:

public class InitializationStep1 extends Fragment{
private PagerAdapter mPagerAdapter;

CustomViewPager pager;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View v = (LinearLayout)inflater.inflate(R.layout.initialization_step1_layout, container, false);

    Button button = (Button) v.findViewById(R.id.goToStep2);
    button.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            CustomViewPager pager = (CustomViewPager) v.findViewById(R.id.viewpager);
            if(pager == null)
                System.out.println("It's null..."); // always getting a null value
            else
                pager.setCurrentItem(0);
        }
    });

    return v;
}
@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    setUserVisibleHint(true);
   }
}

这是我FragmentActivity：

and this is my FragmentActivity:

public class Initialization extends FragmentActivity{
private PagerAdapter mPagerAdapter;

CustomViewPager pager;
Button b1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.setContentView(R.layout.viewpager_initialization_layout);

    //initialize the pager

    List<Fragment> fragments = new Vector<Fragment>();
    fragments.add(Fragment.instantiate(this, InitializationStep1.class.getName()));
    fragments.add(Fragment.instantiate(this, InitializationStep2.class.getName()));
    fragments.add(Fragment.instantiate(this, InitializationStep3.class.getName()));
    this.mPagerAdapter = new PagerAdapter(super.getSupportFragmentManager(), fragments);

    pager = (CustomViewPager)super.findViewById(R.id.viewpager);
    pager.setPagingEnabled(false);
    pager.setAdapter(this.mPagerAdapter);
    pager.setCurrentItem(0);
    }
}

要总结这一切，我有：结果
- 实施3片段（1，2和3）结果，
我想获得：结果
- 包含一个按钮，每一个片段进入下一个片段。（1 - > 2 - > 3）结果
- 含有完成按钮，最后一个片段（因为没有一个碎片导航到）

To sum all this up, I have:
- implemented 3 Fragments (1, 2 and 3)
and I would like to get:
- Each Fragment containing a button to go to the next Fragment (1 -> 2 -> 3).
- The last fragment containing a "finish" button (because there is no next Fragment to navigate to)

我认为这是一个很简单的动作，但我在Android开发相对较新，无法弄清楚这一点。我也许尝试使用了错误的组件来做到这一点。

I assume that this is a very simple action, but I'm relatively new in Android development and couldn't figure this out. I'm maybe trying to use the wrong component to do that.

感谢

推荐答案

我刚刚有同样的问题，试试这个！在初始化FragmentActivity：

I just had the same problem, try this! In your Initialization FragmentActivity:

public CustomViewPager getpager(){
        return pager;
    }

在InitializationStep1

In "InitializationStep1":

CustomViewPager pager;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View v = (LinearLayout)inflater.inflate(R.layout.initialization_step1_layout, container, false);
    pager = ((Initialization)getActivity()).getpager();

    Button next = (Button) v.findViewById(R.id.button1);
    next.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            pager.setCurrentItem(2);
        }
    });

在这种方式，你可以得到您在FragmentActivity声明viewpager对象，所以你可以使用它在每个片段片段之间切换，只要你想！

In this way, you can get the viewpager object that you declare in your FragmentActivity, so you can use it in each fragment to switch between fragments as you want!

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