我使用Tablayout与ViewPagerAdapter。为了在片段之间传递数据或在片段之间进行通信，使用下面的代码，它工作得非常好，并在片段出现时刷新它。第二段点击按钮里面写下面的代码。

b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String text=e1.getText().toString(); // get the text from EditText

            // move from one fragment to another fragment on button click
            TabLayout tablayout = (TabLayout) getActivity().findViewById(R.id.tab_layout); // here tab_layout is the id of TabLayout which is there in parent Activity/Fragment
            if (tablayout.getTabAt(1).isSelected()) { // here 1 is the index number of second fragment i-e current Fragment

                LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(getContext());
                Intent i = new Intent("EDIT_TAG_REFRESH");
                i.putExtra("MyTextValue",text);
                lbm.sendBroadcast(i);

            }
            tablayout.getTabAt(0).select(); // here 0 is the index number of first fragment i-e to which fragment it has to moeve

        }
    });

下面是必须在第一个片段(在我的情况下)i-e中接收片段的代码。

MyReceiver r;
Context context;
String newValue;
public void refresh() {
    //your code in refresh.
    Log.i("Refresh", "YES");
}
public void onPause() {
    super.onPause();

    LocalBroadcastManager.getInstance(context).unregisterReceiver(r);
}
public void onResume() {
    super.onResume();
    r = new MyReceiver();
    LocalBroadcastManager.getInstance(getActivity()).registerReceiver(r,
            new IntentFilter("EDIT_TAG_REFRESH"));
} // this code has to be written before onCreateview()


 // below code can be written any where in the fragment
 private class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
    PostRequestFragment.this.refresh();
        String action = intent.getAction();
        newValue=intent.getStringExtra("MyTextValue");
        t1.setText(newValue); // upon Referesh set the text
    }
}

在我的情况下，在我的Viewpager中有一个textView，在mainActivity中单击按钮，我想改变textView的颜色并更新pagerAdapter。在按钮上单击“我在SharedPreference中保存了颜色”，并更新pagerAdapter，它可以更新从共享首选项中获取的颜色。我用下面的方式更新viewPager视图。

btn_purple.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int color = ContextCompat.getColor(mContext, R.color.colorPrimaryDark2);
                editor.putInt("sahittoFontColor", color);
                editor.apply();
                toNotifyDatasetChanged();
            }
        });

现在更新方法:

 private  void  toNotifyDatasetChanged (){
        if(viewPager!=null&& pagerAdapter!=null) {
            viewPager.setAdapter(null);
            viewPager.setAdapter(pagerAdapter);
           
        }

    }

我的pagerAdapter是:

pagerAdapter = new  Sahitto_ViewPagerAdapter (mContext, filenameParameter, 30, lineList);
                        viewPager.setAdapter(pagerAdapter);

并且在instantiateItem was(在PagerAdapter中):

    SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext);
    int   bnfntcolor=settings.getInt("sahittoFontColor", 0);
if (bnfntcolor!=0){
    textView.setTextColor(bnfntcolor);
}

因此，当我点击按钮，颜色立即改变在pagerAdapter的Textview。

快乐的编码。

感谢瑞。阿劳霍和阿尔瓦罗路易斯布斯塔曼特。首先，我尝试使用rui。阿劳霍的方法，因为很简单。它可以工作，但当数据发生变化时，页面会明显重绘。这很糟糕，所以我试着用布斯塔曼特的方法。它是完美的。代码如下:

@Override
protected void onStart() {
    super.onStart();
}

private class TabPagerAdapter extends PagerAdapter {
    @Override
    public int getCount() {
        return 4;
    }

    @Override
    public boolean isViewFromObject(final View view, final Object object) {
        return view.equals(object);
    }

    @Override
    public void destroyItem(final View container, final int position, final Object object) {
        ((ViewPager) container).removeView((View) object);
    }

    @Override
    public Object instantiateItem(final ViewGroup container, final int position) {
        final View view = LayoutInflater.from(
                getBaseContext()).inflate(R.layout.activity_approval, null, false);
        container.addView(view);
        ListView listView = (ListView) view.findViewById(R.id.list_view);
        view.setTag(position);
        new ShowContentListTask(listView, position).execute();
        return view;
    }
}

当数据发生变化时:

for (int i = 0; i < 4; i++) {
    View view = contentViewPager.findViewWithTag(i);
    if (view != null) {
        ListView listView = (ListView) view.findViewById(R.id.list_view);
        new ShowContentListTask(listView, i).execute();
    }
}

你可以动态更新所有的片段，你可以在三个步骤中看到。

在适配器中:

public class MyPagerAdapter extends FragmentPagerAdapter {
private static int NUM_ITEMS = 3;
private Map<Integer, String> mFragmentTags;
private FragmentManager mFragmentManager;

public MyPagerAdapter(FragmentManager fragmentManager) {
    super(fragmentManager);
    mFragmentManager = fragmentManager;
    mFragmentTags = new HashMap<Integer, String>();
}

// Returns total number of pages
@Override
public int getCount() {
    return NUM_ITEMS;
}

// Returns the fragment to display for that page
@Override
public Fragment getItem(int position) {
    switch (position) {
        case 0:
            return FirstFragment.newInstance();
        case 1:
            return SecondFragment.newInstance();
        case 2:
            return ThirdFragment.newInstance();
        default:
            return null;
    }
}

// Returns the page title for the top indicator
@Override
public CharSequence getPageTitle(int position) {
    return "Page " + position;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
    Object object = super.instantiateItem(container, position);
    if (object instanceof Fragment) {
        Fragment fragment = (Fragment) object;
        String tag = fragment.getTag();
        mFragmentTags.put(position, tag);
    }
    return object;
}

public Fragment getFragment(int position) {
    Fragment fragment = null;
    String tag = mFragmentTags.get(position);
    if (tag != null) {
        fragment = mFragmentManager.findFragmentByTag(tag);
    }
    return fragment;
}}

现在在你的活动中:

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener{

MyPagerAdapter mAdapterViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ViewPager viewPager = (ViewPager) findViewById(R.id.vpPager);
    mAdapterViewPager = new MyPagerAdapter(getSupportFragmentManager());
    viewPager.setAdapter(mAdapterViewPager);
    viewPager.addOnPageChangeListener(this);
}

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {

    Fragment fragment = mAdapterViewPager.getFragment(position);
    if (fragment != null) {
        fragment.onResume();
    }
}

@Override
public void onPageScrollStateChanged(int state) {

}}

最后在你的片段中，是这样的:

public class YourFragment extends Fragment {

// newInstance constructor for creating fragment with arguments
public static YourFragment newInstance() {

    return new YourFragment();
}

// Store instance variables based on arguments passed
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

// Inflate the view for the fragment based on layout XML
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment, container, false);
}


@Override
public void onResume() {
    super.onResume();

    //to refresh your view
    refresh();

}}

您可以在这里看到完整的代码。

谢谢阿尔瓦罗·路易斯·布斯塔曼特。

我想，我有ViewPager的逻辑。

如果我需要刷新一组页面并基于新的数据集显示它们，我调用notifyDataSetChanged()。 然后，ViewPager对getItemPosition()进行多次调用，将Fragment作为对象传递给那里。这个片段可以来自旧数据集(我想要丢弃的数据集)，也可以来自新数据集(我想要显示的数据集)。因此，我重写了getItemPosition()，在那里我必须以某种方式确定我的片段是来自旧数据集还是来自新数据集。

In my case I have a 2-pane layout with a list of top items on the left pane and a swipe view (ViewPager) on the right. So, I store a link to my current top item inside my PagerAdapter and also inside of each instantiated page Fragment. When the selected top item in the list changes, I store the new top item in PagerAdapter and call notifyDataSetChanged(). And in the overridden getItemPosition() I compare the top item from my adapter to the top item from my fragment. And only if they are not equal, I return POSITION_NONE. Then, PagerAdapter reinstantiates all the fragments that have returned POSITION_NONE.

请注意。存储顶部项id而不是引用可能是一个更好的主意。

下面的代码片段有点示意图，但我从实际工作的代码中改编了它。

public class SomeFragment extends Fragment {
  private TopItem topItem;
}

public class SomePagerAdapter extends FragmentStatePagerAdapter {
  private TopItem topItem;

  public void changeTopItem(TopItem newTopItem) {
    topItem = newTopItem;
    notifyDataSetChanged();
  }

  @Override
  public int getItemPosition(Object object) {
    if (((SomeFragment) object).getTopItemId() != topItem.getId()) {
      return POSITION_NONE;
    }
    return super.getItemPosition(object);
  }
}

感谢之前所有的研究人员!

触发mTabsAdapter.onTabChanged (mTabHost.getCurrentTabTag ());在更新视图之前。这是可行的。