更新与fragmentStatePagerAdapter片段/意见viewpager [英] Updating fragments/views in viewpager with fragmentStatePagerAdapter

问题描述

需要一些帮助，同时使用viewpager更新页面我的问题。我使用的是简单的viewpager与FragmentStatePagerAdapter。所有我想要做的就是访问当前片段/视图，以便我可以更新我的片段/查看一些​​textviews。我在论坛上搜索到四周，才知道几件事情 - 其中一个方法来处理这​​个是通过设置标签在instantiateItem（）调用回适配器和retreive由findViewbyTag的看法。我无法理解如何实现这一点，我也不能肯定是否会工作FragmentStatePagerAdapter。 - 我探索其他选项，在各大论坛建议，但不能使他们的工作

。

我的code是非常相同的是Android <一个href="http://developer.android.com/training/animation/screen-slide.html">http://developer.android.com/training/animation/screen-slide.html.基本部件是相同的（片段活性的xml与某些显示部件，包括一个TextView，viewpager的xml只需视图寻呼机中它，一个片段类和主FragmentActivity类）。在我的FragmentActivity I类添加了一个pageChangelistener我v​​iewpager这样我可以onPageSelected（）在做我的T​​extView的变化。

任何帮助是为AP preciated。

添加code，以供参考。

 公共类myActivity扩展FragmentActivity
  //变量声明
  保护无效的onCreate（包savedInstanceState）{
  ViewPager mPager =（ViewPager）findViewById（R.id.pager）;
  mPagerAdapter =新ScreenSlidePagerAdapter（getSupportFragmentManager（））;
  mPager.setAdapter（mPagerAdapter）;
  查看CurrView;

  OnPageChangeListener pageChangelistener =新OnPageChangeListener（）{
    @覆盖
    公共无效onPageSelected（INT pageSelected）{
       doTextViewChnges（）; //获取文本查看和更新​​其基于pageSelected

   ---这是我在哪里停留在试图让TextView的在我目前的FRAGMWNT / VIEW -------
   }

  mPager.setOnPageChangeListener（pageChangelistener）;
 }
  私有类ScreenSlidePagerAdapter扩展FragmentStatePagerAdapter {
    公共ScreenSlidePagerAdapter（android.support.v4.app.FragmentManager FM）{
        超（FM）;
    }

    @覆盖
    公共android.support.v4.app.Fragment的getItem（INT位置）{
        返回ScreenSlidePageFragment.create（位置，＆lt;其他参数，我想通过＆GT;）;
    }

    @覆盖
    公众诠释getCount将（）{
        返回NUM_PAGES;
    }
}
 

解决方案

在你的OnPageChangeListener：

  OnPageChangeListener pageChangelistener =新OnPageChangeListener（）{
            @覆盖
            公共无效onPageSelected（INT pageSelected）{
 ScreenSlidePageFragment currentFragment =（ScreenSlidePageFragment）mPagerAdapter.getItem（pageSelected）
               doTextViewChnges（）; //获取文本查看和更新​​其基于pageSelected

           ---这是我在哪里停留在试图让TextView的在我目前的FRAGMWNT / VIEW -------
           }
 

Need some help with my problem of updating pages while using viewpager. I am using a simple viewpager with FragmentStatePagerAdapter. All I want to do is get access to the current fragment/view so as I can update some textviews in my fragment/view. I searched around in the forum and came to know few things - One of the ways to handle this is by setting tag in instantiateItem() call back of the adapter and retreive the view by findViewbyTag. I could not understand how to implement this and I am also not sure if that will work for FragmentStatePagerAdapter. - I explored other options as suggested in various forums, but cannot make them work.

My code is very much same as in a android http://developer.android.com/training/animation/screen-slide.html. Basic components are the same (Fragment activity xml with some display components including a textview, viewpager xml with just a view pager in it, a Fragment class and the main FragmentActivity class). in my FragmentActivity class I have added a pageChangelistener to my viewpager so as I can do my textview changes during onPageSelected().

Any help is is appreciated.

Adding the code for reference.

Public class myActivity extends FragmentActivity
  //Variable declarations
  protected void onCreate(Bundle savedInstanceState) {
  ViewPager mPager = (ViewPager) findViewById(R.id.pager);
  mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
  mPager.setAdapter(mPagerAdapter);
  View CurrView;

  OnPageChangeListener pageChangelistener = new OnPageChangeListener() {
    @Override
    public void onPageSelected(int pageSelected) {
       doTextViewChnges();//access the text view and update it based on pageSelected

   ---THIS IS WHERE I AM STUCK IN TRYING TO GET THE TEXTVIEW IN MY CURRENT FRAGMWNT/VIEW-------
   }

  mPager.setOnPageChangeListener(pageChangelistener);
 }
  private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter { 
    public ScreenSlidePagerAdapter(android.support.v4.app.FragmentManager  fm) {
        super(fm);
    }

    @Override
    public android.support.v4.app.Fragment getItem(int position) { 
        return ScreenSlidePageFragment.create(position, <other parameters I want to pass>);
    }

    @Override
    public int getCount() {
        return NUM_PAGES;
    }
}

解决方案

in your OnPageChangeListener:

      OnPageChangeListener pageChangelistener = new OnPageChangeListener() {
            @Override
            public void onPageSelected(int pageSelected) {
 ScreenSlidePageFragment currentFragment = (ScreenSlidePageFragment) mPagerAdapter.getItem(pageSelected)
               doTextViewChnges();//access the text view and update it based on pageSelected

           ---THIS IS WHERE I AM STUCK IN TRYING TO GET THE TEXTVIEW IN MY CURRENT FRAGMWNT/VIEW-------
           }

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