【发布时间】：2020-08-07 11:04:43
【问题描述】：
我有一个主要的家庭活动，它由屏幕底部的 3 个选项卡组成。
在这个activity里面我有一个fragment。
此片段包含view pager。此视图寻呼机用于在 2 个活动之间导航：
1.Exercise Form = 显示练习视频。
2.Exercise History = 显示所有用户记录的锻炼数据。
要获取锻炼表单视频以及锻炼历史记录，我需要能够从 ProgressFagment2（屏幕顶部的文本）访问锻炼名称并将其传递给 2 个子片段（锻炼家庭视频片段和锻炼历史片段）
如何访问子片段中的exerciseName？
ProgressFragment2（片段内部活动）
public class Progress_Fragment2 extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.exercises_history_demo, container, false);
}
public void onViewCreated(View view, Bundle savedInstanceState) {
childExerciseName = getArguments().getString("ExerciseName");
TextView title_tv = getView().findViewById(R.id.textView_exerciseName8);
title_tv.setText(childExerciseName);
SectionsPagerAdapter mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
ViewPager mViewPager = (ViewPager) getView().findViewById(R.id.view_pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) getView().findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Inflate the menu; this adds items to the action bar if it is present.
inflater.inflate(R.menu.top_navigation_two, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new ExerciseHomeVideoFragment();
break;
case 1:
fragment = new ExerciseHistoryFragment();
break;
}
return fragment;
}
@Override
public int getCount() {
// Show 2 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Exercise Form";
case 1:
return "Exercise History";
}
return null;
}
}
}
ExerciseHomeVideoFragment（viewPager 中的 2 个片段之一）|仅相关代码
public class ExerciseHomeVideoFragment extends Fragment implements View.OnClickListener {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_exercise_info_home_version, container, false);
}
@RequiresApi(api = Build.VERSION_CODES.O)
public void onViewCreated(View view, Bundle savedInstanceState) {
Progress_Fragment2 parentFrag = ((Progress_Fragment2)ExerciseHomeVideoFragment.this.getParentFragment());
youTubeBtn = getView().findViewById(R.id.youTubeSearchButton);
parent_tv = getView().findViewById(R.id.textView_exerciseName8);
childExerciseViewModel = ViewModelProviders.of(this).get(ChildExerciseViewModel.class);
//
// HOW CAN I ACCESS THE CHILDEXERCISE NAME???
//
// childExerciseName = getArguments().getString("ExerciseName"); // THIS DOESNT WORK
// exerciseNameTV.setText(childExerciseName + " Demo");
}
}
【问题讨论】：
标签： android android-fragments android-viewpager android-fragmentactivity