在所有选项卡下，而不仅仅是应该查看的片段，都可以在所有标签下查看片段

Question

package com.beacons.railwayaid.raid;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.customlbs.library.IndoorsFactory;
import com.customlbs.surface.library.IndoorsSurfaceFactory;
import com.customlbs.surface.library.IndoorsSurfaceFragment;
public class Navigation extends Fragment{

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup     container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.navigation_layout, container, false);
    IndoorsFactory.Builder indoorsBuilder = new IndoorsFactory.Builder();
    IndoorsSurfaceFactory.Builder surfaceBuilder = new IndoorsSurfaceFactory.Builder();
    indoorsBuilder.setContext(getContext());
    indoorsBuilder.setApiKey("69af5e85-007a-4df5-8715-d1c2c22e206f");

    indoorsBuilder.setBuildingId((long) 979231679);
    surfaceBuilder.setIndoorsBuilder(indoorsBuilder);
    IndoorsSurfaceFragment indoorsFragment = surfaceBuilder.build();
    FragmentTransaction transaction =   getFragmentManager().beginTransaction();
    transaction.replace(android.R.id.tabcontent, indoorsFragment, "indoors");
    transaction.commit();

    return v;
    }
}

我是Android应用程序开发的新手，我无法弄清楚为什么在所有选项卡下都查看片段。以前是仅是TextView时，该应用在每个选项卡下显示了特定的文本，并且该应用程序可以使用，但是以某种方式添加此新代码会导致在所有选项卡下查看片段。

编辑：

适配器代码：

package com.beacons.railwayaid.raid;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import java.util.List;

public class PagerAdapter extends FragmentPagerAdapter {
List<Fragment> listFragments;
public PagerAdapter(FragmentManager fm, List<Fragment> listFragments){
    super(fm);
    this.listFragments = listFragments;
}
@Override
public Fragment getItem(int position) {
    return listFragments.get(position);
}
@Override
public int getCount() {
    return listFragments.size();
    }
}

Answer 1

您需要使用adpater在片段之间切换。同样在适配器中，您需要提供开关案例，以根据选定的选项卡选择适当的片段。

看看这个。

https://developer.android.com/reference/android/support/v4/app/fragmentpageradapter.html

Answer 2

，因为您仅设置该片段，因此必须使用开关情况或如果条件并在每个选项卡中拿出ID并在perticular Tab处设置。

就像这样：

private void setupViewPager(ViewPager viewPager) {
    FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
    ViewPagerAdapter adapter = new ViewPagerAdapter(fragmentManager);
        if (role == 1) {
            adapter.addFragment(new MyDetailsB(), "My Details");
            adapter.addFragment(new Biography(), "Biography");
            viewPager.setAdapter(adapter);
        }
    }
    if (st == 1) {
        adapter.addFragment(new MyDetailsB(), "My Details");
        adapter.addFragment(new Biography(), "Biography");
        viewPager.setAdapter(adapter);
    }
}
private static class ViewPagerAdapter extends FragmentStatePagerAdapter {
    private final List<android.support.v4.app.Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();
    private ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }
    @Override
    public android.support.v4.app.Fragment getItem(int position) {
        return mFragmentList.get(position);
    }
    @Override
    public int getCount() {
        return mFragmentList.size();
    }
    private void addFragment(android.support.v4.app.Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }
    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}