片段onResume（）被使用FragmentPagerAdapter时，不叫 [英] Fragment onResume() isn't called when using FragmentPagerAdapter

问题描述

我需要我的片段随时调用某一功能时，他们的活性片段，所以我把它放在onResume（），但它没有被调用。

I need my fragments to always call a certain function when they are the active fragment, so I put it in onResume(), but it isn't being called.

片段A

@Override
public  void onResume(){
    super.onResume();
    Log.d("clear state", " "+clear);
    if(clear == true)
    {
        restart();
        clear = false;
        calculate();
    }
}

我用的FragmentPagerAdapter与ViewPager切换片段

I use a FragmentPagerAdapter with a ViewPager to switch fragments

public class ScoutingFragSingle extends FragmentPagerAdapter{


@Override
public Fragment getItem(int index) {
    Bundle data = new Bundle();
    switch(index){
    case 0:
        TeamsFragment teamsFragment = new TeamsFragment();
        data.putInt("current_page", index+1);
        teamsFragment.setArguments(data);
        return teamsFragment;
    case 1:

        data.putInt("current_page", index+1);
        data.putInt("matchId", matchNum);
        aFragment.setArguments(data);
        return aFragment;

所以，我怎么会做出片段致电其onResume（）？

So how would I make the fragments call their onResume()?

推荐答案

我有同样的问题，前一段时间。

I had the same problem while ago.

创建一个新的接口，并通过您的两个片段取值实现它：

Create a new interface and implement it by both of your Fragments:

public interface OnPageSelectedListener {
    void onPageSelected();
}

在父活动实施 android.support.v4.view.ViewPager.OnPageChangeListener 和呼叫片段这样的方法

In parent activity implement android.support.v4.view.ViewPager.OnPageChangeListener and call Fragment method like this:

@Override
public void onPageSelected(int i) {
    OnPageSelectedListener fragment = (OnPageSelectedListener ((PlaceListPagerAdapter)pager.getAdapter()).getFragment(i);
    fragment.onPageSelected();
}

PS：新界面的名称和它的方法是有点混乱，所以一定要小心，或更改

PS: Name of the new interface and its method is a bit confusing, so be careful or change it.

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