我有一个项目需要有两个viewpager,每个都在活动的不同片段中.
这样的架构是这样的
问题是当寻呼机视图膨胀时,另一个不是.
例如,可以通过单击访问片段1,2和3.当我点击第一个片段时,它会完美地展开视图寻呼机及其两个片段,但是如果我点击片段3,则视图寻呼机不会使片段膨胀,而且标签也会变慢.再次打开应用程序进程,首先单击片段3,它可以正常工作,但点击后面的第一个,这个问题再次发生.
已经调试过程并没有什么不同.
我的活动
public class HomeActivity extends AppCompatActivity implements NavigationFragment.OnNavigationListener{
public NavigationFragment mNavigation;
private String mTagFragmentShowing = "";
private int currentNavigation = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
ButterKnife.bind(this);
mNavigation = (NavigationFragment) getFragmentManager().findFragmentById(R.id.manager_navigation);
onNavigationSelected(currentNavigation);
}
@Override
public void onNavigationSelected(int position) {
if (mTagFragmentShowing.equals(String.valueOf(position)))
return;
currentNavigation = position;
mNavigation.setNavigationSelected(position);
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment fragment = fragmentManager.findFragmentByTag(mTagFragmentShowing);
// Hide last fragment
if (fragment != null && fragment.isVisible()) {
fragmentManager.beginTransaction().hide(fragment).commit();
}
// Show new fragment
mTagFragmentShowing = String.valueOf(position);
fragment = fragmentManager.findFragmentByTag(mTagFragmentShowing);
if (fragment != null && fragment.isHidden()) {
fragmentManager.beginTransaction().show(fragment).commit();
} else if (fragment == null) {
fragmentManager.beginTransaction().add(R.id.manager_content, getFragmentByPosition(position), mTagFragmentShowing)
.setTransition(FragmentTransaction.TRANSIT_NONE).commit();
}
}
private Fragment getFragmentByPosition(int position) {
switch (position) {
case 0:
return new DiscoverFragment();
case 1:
return new UpcomingFragment();
case 2:
return new FeaturesFragment();
case 3:
return new VideosFragment();
case 4:
return new MySongsFragment();
}
return null;
}
我的导航片段.它控制其他片段
public class NavigationFragment extends Fragment implements View.OnClickListener {
public ViewHolder mHolder;
public View mButtonSelected;
public OnNavigationListener mCallback;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.component_navigation, container, false);
ButterKnife.bind(this, view);
initView(view);
return view;
}
public void initView(View view) {
mHolder = new ViewHolder();
mHolder.discover = view.findViewById(R.id.component_navigation_discover);
mHolder.upcoming = view.findViewById(R.id.component_navigation_upcoming);
mHolder.features = view.findViewById(R.id.component_navigation_features);
mHolder.videos = view.findViewById(R.id.component_navigation_videos);
mHolder.mymusic = view.findViewById(R.id.component_navigation_mymusic);
mHolder.discover.setTag(0);
mHolder.upcoming.setTag(1);
mHolder.features.setTag(2);
mHolder.videos.setTag(3);
mHolder.mymusic.setTag(4);
mHolder.discover.setOnClickListener(this);
mHolder.upcoming.setOnClickListener(this);
mHolder.features.setOnClickListener(this);
mHolder.videos.setOnClickListener(this);
mHolder.mymusic.setOnClickListener(this);
mButtonSelected = mHolder.features;
}
public void setNavigationSelected(int position) {
setNavigationButtonSelected(false);
switch (position) {
case 0:
mButtonSelected = mHolder.discover;
break;
case 1:
mButtonSelected = mHolder.upcoming;
break;
case 2:
mButtonSelected = mHolder.features;
break;
case 3:
mButtonSelected = mHolder.videos;
break;
case 4:
mButtonSelected = mHolder.mymusic;
break;
}
setNavigationButtonSelected(true);
}
public void setNavigationButtonSelected(boolean enabled) {
mButtonSelected.setBackgroundColor(enabled ? getResources().getColor(R.color.color_red) : Color.TRANSPARENT);
}
@Override
public void onClick(View view) {
if (view != mButtonSelected) {
mCallback.onNavigationSelected((Integer) view.getTag());
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (OnNavigationListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnNavigationSelectedListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mCallback = null;
}
static class ViewHolder {
View discover;
View upcoming;
View features;
View videos;
View mymusic;
}
public interface OnNavigationListener {
public void onNavigationSelected(int position);
}
我的片段与视图寻呼机
public class MySongsFragment extends Fragment {
private OnFragmentInteractionListener mListener;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().getSupportFragmentManager().beginTransaction().add(R.id.mysongs_fragment_container, MySongsViewPagerFragment.newInstance(0)).commit();
return inflater.inflate(R.layout.fragment_my_songs, container, false);
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
*
* See the Android Training lesson Communicating with Other Fragments for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
我的观点寻呼机
public class MySongsViewPagerFragment extends Fragment {
private static final int NUM_PAGES = 4;
private String[] tab_names;
private List mTabNames;
private PagerAdapter mPagerAdapter;
public @Bind(R.id.pager)
ViewPager mPager;
public static MySongsViewPagerFragment newInstance(int index) {
MySongsViewPagerFragment fragment = new MySongsViewPagerFragment();
Bundle args = new Bundle();
args.putInt("index", index);
fragment.setArguments(args);
return fragment;
}
@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = initView(inflater, container);
return view;
}
@NonNull private View initView(LayoutInflater inflater, ViewGroup container) {
View view = inflater.inflate(R.layout.fragment_view_pager_my_songs, container, false);
ButterKnife.bind(this, view);
tab_names = getResources().getStringArray(R.array.tabs_mysongs);
mTabNames = Arrays.asList(tab_names);
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity().getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
mPager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mPager.onTouchEvent(event);
return false;
}
});
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mPager);
return view;
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override public Fragment getItem(int position) {
switch (position) {
case 0:
return new PlaylistsFragment();
case 1:
return new SongsFragment();
case 2:
return new AlbumsFragment();
case 3:
return new ArtistsFragment();
default:
return new PlaylistsFragment();
}
}
@Override public int getCount() {
return NUM_PAGES;
}
@Override public CharSequence getPageTitle(int position) {
return mTabNames.get(position);
}
}
André Dantas.. 8
问题是viewpager中的活动上下文
在我的视图中寻呼机.我改变
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity().getSupportFragmentManager()); mPager.setAdapter(mPagerAdapter);
至
mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager()); mPager.setAdapter(mPagerAdapter);
两个viewpager使用相同的上下文.因此,当我第一次膨胀时,另一个没有膨胀,因为解释已经存在一个膨胀的viewpager.
感谢mcwise帮助向我展示方法getChildFragmentManager().
问题是viewpager中的活动上下文
在我的视图中寻呼机.我改变
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity().getSupportFragmentManager()); mPager.setAdapter(mPagerAdapter);
至
mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager()); mPager.setAdapter(mPagerAdapter);
两个viewpager使用相同的上下文.因此,当我第一次膨胀时,另一个没有膨胀,因为解释已经存在一个膨胀的viewpager.
感谢mcwise帮助向我展示方法getChildFragmentManager().
京公网安备 11010802040832号 | 京ICP备19059560号-6 