本文介绍了重新启动viewpager时,它会继续执行上一个片段的处理方法,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

该活动的homeFragment包含viewPager.

如果刷新homeFragment,则也会使用新数据重新生成viewPager.

If I refresh the homeFragment, the viewPager is also regenerated with the new data.

但是在创建适配器之前,将重新执行viewPager中的旧片段.

But The old fragment in the viewPager is re-executed before the adapter is created.

即使我用Google搜索,也没有明确的答案

I do not get a clear answer even if I googleing it

1. homeFragment刷新代码:

Fragment currentFragment = null;
currentFragment = getSupportFragmentManager().findFragmentById(R.id.content_frame);
final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

ft.detach(currentFragment);
ft.attach(currentFragment);
ft.commit();

2.适配器

public class ChartViewPagerAdapter extends FragmentStatePagerAdapter {

   public ChartViewPagerAdapter(FragmentManager fm) {
      super(fm);
   }

   @Override
   public Fragment getItem(int i) {
      ChartFragment chartFragment = new ChartFragment();
      Bundle args = new Bundle();
      args.putInt("POSITION", i);
      chartFragment.setArguments(args);

      return chartFragment;
      //return ChartFragment.newInstance(i);
   }

   @Override
   public int getCount() {

       switch (MainActivity.countryCode) {
          case "US":
            return 4;
          case "KR":
            return 3;
          case "DE":
            return 3;
          case "JP":
            return 1;
          case "CN":
            return 1;
          case "HK":
            return 1;
          case "FR":
            return 3;
          case "GB":
            return 2;
          default:
            return 3;
       }
   }
}
  1. 最接近的方法是在执行viewpager.setSaveParentEnlaled (false);时,但是如果我看到日志记录,它将多次被相同的代码调用,所以我会收到错误消息.

  1. The closest approach is when executing viewpager.setSaveParentEnlaled (false); but If I see the log record, it will be called again same code several times, so I get error message.

这没问题,如果我更改了刷新方法以立即在homeFragment中运行该方法而无需使用分离/附加方式,但是设计应使用分离/附加方式.

It is not a problem If I change the refresh method to run the method in the homeFragment immediately without using detach / attach way, but the design should use the detach / attach way.

推荐答案

您必须致电

viewpager.setAdapter(null)

或科特林

viewpager.adapter = (null)

它将重置ViewPager到开始位置.

It will be reset the ViewPager to start position.

这篇关于重新启动viewpager时,它会继续执行上一个片段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!

07-18 19:46
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