Question

我有一个包含2个片段的Activity，我想通过点击ActionBar工具栏上的按钮来刷新它。

我知道有很多关于stackoverflow的问题的答案，我已经尝试过这个问题并没有完全解决我的问题，或者对我来说实现起来相当复杂。

我尝试使用

ViewGroup parent = (ViewGroup) viewPager.getParent();
if (parent != null) {
            parent.removeView(viewPager);
}

删除viewpager，点击刷新按钮时，它没有用。

我试过了notifyDataChanged();，它也没有用。

这是我的Activity，下面的FragmentPagerAdapter代码。

public class MainActivity extends AppCompatActivity implements android.view.View.OnClickListener{

    private Toolbar toolbar;

    int firstrun = 0;
    ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        // Set a Toolbar to replace the ActionBar.
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        viewPager = (ViewPager) findViewById(R.id.viewpager);
        if (viewPager != null) {
            setupViewPager(viewPager, 0);
            viewPager.setOffscreenPageLimit(1);
        }

        SlidingTabLayout mTabs = (SlidingTabLayout) findViewById(R.id.tabs);
        mTabs.setDistributeEvenly(true);


        // Setting Custom Color for the Scroll bar indicator of the Tab View
        mTabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
            @Override
            public int getIndicatorColor(int position) {
                return getResources().getColor(R.color.tabsScrollColor);
            }

        });

        mTabs.setViewPager(viewPager);



        /** buttons at toolbar, that would trigger the refresh **/
        ImageView A = (ImageView) findViewById(R.id.refresh);
        A.setOnClickListener(this);

    }

    public void onClick(View v){
        if(v.getId() == R.id.refresh ){


            viewPager = (ViewPager) findViewById(R.id.viewpager);
            if (viewPager != null) {
                setupViewPager(viewPager, 1);  // Setting to 1 or 0 
                viewPager.setOffscreenPageLimit(2);
            }

            Toast.makeText(MainActivity.this, "Refreshing...", Toast.LENGTH_SHORT).show();
        }
    }






    private void setupViewPager(ViewPager viewPager, int num) {
        Adapter adapter = new Adapter(getSupportFragmentManager());
        adapter.addFragment(new TabOneFragment(), "TAB 1");
        adapter.addFragment(new TabTwoFragment(), "TAB 2");

        // I tried this , It didn't work.
        /*ViewGroup parent = (ViewGroup) viewPager.getParent();
        if (parent != null) {
            parent.removeView(viewPager);
        }*/


        if(num==0) {
            viewPager.setAdapter(adapter);
        }else{
            // I tried this, It didn't work as well
            viewPager.getAdapter().notifyDataSetChanged();
        }
    }

    // My Fragment Pager Adapter static class
    static class Adapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragments = new ArrayList<>();
        private final List<String> mFragmentTitles = new ArrayList<>();

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

        public void addFragment(Fragment fragment, String title) {
            mFragments.add(fragment);
            mFragmentTitles.add(title);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragments.get(position);
        }

        @Override
        public int getCount() {
            return mFragments.size();
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitles.get(position);
        }

        @Override
        public void destroyItem(View collection, int position, Object view) {
            ((ViewPager) collection).removeView((View) view);
        }

    }

}

这是我的片段代码。

public class TabOneFragment extends Fragment {


    private int mPage;
    private RecyclerView view;
    private View mview;

    public static TabOneFragment newInstance(int page) {
        Bundle args = new Bundle();
        args.putInt(ARG_PAGE, page);
        TabOneFragment fragment = new TabOneFragment();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //mPage = getArguments().getInt(ARG_PAGE);
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {


            View mview = inflater.inflate(R.layout.fragment_all_tabs, container, false);
            view = (RecyclerView) mview.findViewById(R.id.homelistrecyclerview);


        RestAdapter restAdapter = new RestAdapter.Builder().
                setEndpoint(Info.getEndpoint()).build();
        MovieApi mApi = restAdapter.create(MovieApi.class);
        mApi.getTabOneContent(new Callback<Info>() {
            @Override
            public void success(Info info, Response response) {
                Info example = info;


                view.setLayoutManager(new LinearLayoutManager(view.getContext()));
                view.setAdapter(new ListingAdapter(getActivity(),
                        example.getMovies(), tabId, Info.getSchedule(), example.getShowtime()));
            }

            @Override
            public void failure(RetrofitError error) {
                //Toast.makeText(getActivity(), error.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
                //Log.d("RetrofitError: ", error.getLocalizedMessage());

            }
        });

        return view;
    }

下面的布局。

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:card_view="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >


<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/homelistrecyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />


</LinearLayout>

Answer 1

基本上你应该把它添加到你的适配器：

@Override
public int getItemPosition(Object object) {
    return POSITION_NONE;
}

Android - 刷新viewpager内容

1 个答案: