编辑
fragment A 具有功能 A1
fragment B 具有功能 B1
主要 Activity 中的两个标签
tabA 得到 fragment A
tabB 得到 fragment B
我的问题是:从主要 Activity 调用函数 A1
//here i create taps and fragment into viewpaper
private void setupViewPager(ViewPager viewPager){
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new OneFragment(),"ONE");
adapter.addFragment(new TwoFragment(),"TWO");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter{
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment,String tittle){
mFragmentList.add(fragment);
mFragmentTitleList.add(tittle);
}
}
最佳答案
根据您发布的代码,您可以像这样将 fragment 的实例直接保存在您的 Activity 中
private OneFragment f1;
private TwoFragment f2;
private void setupViewPager(ViewPager viewPager){
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
f1 = new OneFragment();
f2 = new TwoFragment();
adapter.addFragment(f1,"ONE");
adapter.addFragment(f2,"TWO");
viewPager.setAdapter(adapter);
}
然后你想在你的 Activity 中的任何地方调用它们就可以了
f1.myMethod();
f2.myMethod();
您也可以只保存您的适配器并使用它来访问 fragment ,如
private ViewPagerAdapter adapter;
private void setupViewPager(ViewPager viewPager){
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new OneFragment(),"ONE");
adapter.addFragment(new TwoFragment(),"TWO");
viewPager.setAdapter(adapter);
}
并在 Activity 调用中访问它们
OneFragment f1 = (OneFragment)adapter.getItem(0);
TwoFragment f2 = (TwoFragment)adapter.getItem(1);
关于android - 从 MainActivity 的 fragment 中调用函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51572212/