无论如何，在KitKat+上，适配器. notifydatasetchanged()似乎足以导致新视图显示，前提是你已经将toffscreenpagelimit设置得足够高。我能够通过执行viewpage . setoffscreenpagelimit(2)来获得所需的行为。

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。

1.首先，您必须在Pageradapter类中设置getItemposition方法 2.您必须阅读您的视图寻呼机的确切位置 3.然后将该位置作为新位置的数据位置发送 4.在setonPageChange监听器中写入更新按钮的点击监听器

我修改了程序代码，只设置了特定的位置元素

public class MyActivity extends Activity {

private ViewPager myViewPager;
private List<String> data;
public int location=0;
public Button updateButton;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    data = new ArrayList<String>();
    data.add("A");
    data.add("B");
    data.add("C");
    data.add("D");
    data.add("E");
    data.add("F");

    myViewPager = (ViewPager) findViewById(R.id.pager);
    myViewPager.setAdapter(new MyViewPagerAdapter(this, data));

      updateButton = (Button) findViewById(R.id.update);

    myViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int i, float v, int i2) {
             //Toast.makeText(MyActivity.this, i+"  Is Selected  "+data.size(), Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onPageSelected( int i) {
          // here you will get the position of selected page
            final int k = i;
             updateViewPager(k);

        }

        @Override
        public void onPageScrollStateChanged(int i) {

        }
    });
}

private void updateViewPager(final int i) {  
    updateButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            Toast.makeText(MyActivity.this, i+"  Is Selected  "+data.size(), Toast.LENGTH_SHORT).show();
            data.set(i, "Replaced "+i);         
            myViewPager.getAdapter().notifyDataSetChanged();
        }
    });

}

private class MyViewPagerAdapter extends PagerAdapter {

    private List<String> data;
    private Context ctx;

    public MyViewPagerAdapter(Context ctx, List<String> data) {
        this.ctx = ctx;
        this.data = data;
    }

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

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

    @Override
    public Object instantiateItem(View collection, int position) {          

        TextView view = new TextView(ctx);
        view.setText(data.get(position));
        ((ViewPager)collection).addView(view);            
        return view;
    }

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

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

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {
    }

    @Override
    public void startUpdate(View arg0) {
    }

    @Override
    public void finishUpdate(View arg0) {
    }
}
}

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。

你只需要这段简单的代码:

代码:

private void updateAdapter() {
    if (adapterViewPager != null) {
        int from = vpMyViewPager.getCurrentItem() - vpMyViewPager.getOffscreenPageLimit();
        int to = vpMyViewPager.getCurrentItem() + vpMyViewPager.getOffscreenPageLimit();
        vpMyViewPager.removeAllViews();
        for (int i = from; i <= to; i++) {
            if (i < 0) {
                continue;
            }
            adapterViewPager.instantiateItem(vpMyViewPager, i);
        }
    }
}

解释:

If you haven't changed offscreenPageLimit of the ViewPager, it always has 3 to 4 children depending on which direction you are going. And in order to show the correct content inside its children, it uses the adapter to get the right content. now when you call removeAllViews() on your ViewPager, only 3 to 4 Views are actually being removed from the Window's hierarchy, and by calling instantiateItem(ViewGroup viewPager, int index), you are only recreating 3 to 4 Views. Then everything is back to normal, you swipe and scroll, the ViewPager shows contents using its adapter. The number of its children is not the same on all devices in all situations, for example if you set the offscreenPageLimit to 5, it will probably have around 11 to 12 children, but that's all, it's not much. it's fast.

一个更简单的方法:使用FragmentPagerAdapter，并将页面视图包装到片段上。它们确实会更新