第一次加载后,屏幕外ViewPager片段将无法渲染 [英] offscreen viewpager fragments won't render after 1st time loaded

本文介绍了第一次加载后,屏幕外ViewPager片段将无法渲染的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个带有5个选项卡的viewpager,如果我转到第5个片段(即单击第5个选项卡或滑动到第5个选项卡时加载的片段),然后转到第3个选项卡,第5个片段将不会不再加载视图,如果我转到第二个或第一个选项卡,则第四个和第五个选项卡将不会.我尝试更改viewpager.offscreenlimit(3)甚至5,但没有结果.如果它可以帮助任何人弄清楚,无论我取代第3位的第4位和第5位使用什么片段,它都会发生.另外,第一次对viewpager进行更改大约需要1.5秒的时间.

I have a viewpager with 5 tabs and if I go to the 5th fragment(that is the fragment loaded when I click the 5th tab or swipe to the 5th tab) and then I go to the 3rd tab the 5th fragment won't load the view anymore and if I go to the 2nd or 1st tab the 4th and 5th tabs won't. I tried changing the viewpager.offscreenlimit(3) or even 5 with no results. If it helps anyone figure it out, it happens regardless of what fragments I put in place of the 3rd 4th and 5th positions. Also, the first viewpager change takes a while , about 1.5 seconds.

这是我的代码

mport android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.view.ViewGroup;

import java.util.List;

public class AppSectionsPagerAdapter extends FragmentStatePagerAdapter
{
private static String[] fragmentNames = { "Example0", "Example1", "Example2","Example3","Example4"};
private FragmentManager fragmentManager = null;
private List<Fragment> fragments=null;
Fragment example0;
Fragment example1;
Fragment example2;
Fragment example3;
Fragment example4;
int numFragments;
int errorcode;

public AppSectionsPagerAdapter(FragmentManager fm)
{
    super(fm);
    numFragments = 5;
    this.fragmentManager = fm;
    example0 = new ListFragment();
    example1 = new ListFragment();
    example2 = new ListFragment();
    example3 = new Fragment();
    example4 = new Fragment();

}
@Override
public Fragment getItem(int i)
{
    switch (i)
    {
        case 0:
             return example0;
        case 1:
            return example1;
        case 2:
           return example2;
        case 3:
            return example3;
        case 4:
            return example4;

        default:
            Fragment frag = new Error_Fragment();
            Bundle args = new Bundle();
            errorcode = -5;
            //args.putInt(errorcode, i + 1);
            frag.setArguments(args);
            return frag;
    }
}
@Override
public int getCount()
{
   return numFragments;
}

@Override
public CharSequence getPageTitle(int position)
{
    return fragmentNames[position];
}

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object)
{
    super.setPrimaryItem(container,0,object);
}
@Override
public void notifyDataSetChanged()
{
    super.notifyDataSetChanged();
}
@Override
public void destroyItem(ViewGroup collection, int position, Object view)
{
    fragmentManager.executePendingTransactions();
    //fragmentManager.saveFragmentInstanceState(fragments.get(position));
}
}

推荐答案

我终于明白了!我有这些代码行

I finally figured it out! I had these lines of code

vpager.setPageTransformer(false, new ViewPager.PageTransformer() // page swipe animations
    {
        @Override
        public void transformPage(View page, float position)
        {
            int pageWidth = page.getWidth();
            int pageHeight = page.getHeight();

            if (position < -1)   // [-Infinity,-1)
            {
                // This page is way off-screen to the left.
                page.setAlpha(1);
            }
            else if(position <= 1)    // Page to the left, page centered, page to the right
            {
                // modify page view animations here for pages in view
            }
            else     // (1,+Infinity]
            {
                // This page is way off-screen to the right.
                page.setAlpha(0);
            }
        }
    });

,我只是将它们注释掉了.我想我应该已经发布了,但是我不知道它会干扰未加载的页面.

and I simply commented them out. I guess I should have posted that but I had no idea it could interfere with pages not loading.

这篇关于第一次加载后,屏幕外ViewPager片段将无法渲染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!

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