Java 如何根据第一个选项卡中微调器项的选择更改第二个选项卡的xml布局

我添加了3个选项卡，如下所示。在“IntroductionFragment”中有一个微调器（下拉列表）。我想根据“IntroductionFragment”中微调器项的选择以编程方式更改“RequirementFragment”的布局。请帮助我

HomeLoanTabMainActivity.java

public class HomeLoanTabMainActivity extends FragmentActivity implements
ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "Introduction", "Requirement", "Best offer" };

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

    viewPager = (ViewPager) findViewById(R.id.pager);
    actionBar = getActionBar();
    mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

    viewPager.setAdapter(mAdapter);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    for (String tab_name : tabs) {
        actionBar.addTab(actionBar.newTab().setText(tab_name)
                .setTabListener(this));
    }
    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            actionBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    });
}

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
    // on tab selected
    // show respected fragment view
    viewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
}

TabsPagerAdapter.java

public class TabsPagerAdapter extends FragmentPagerAdapter {

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

@Override
public Fragment getItem(int index) {

    switch (index) {
    case 0: 
        return new IntroductionFragment();
    case 1:     
        return new RequirementFragment();
    case 2:         
        return new BestOfferFragment();

    }
    return null;
}

@Override
public int getCount() {
    // get item count - equal to number of tabs
    return 3;
}

}

IntroductionFragment.java

public class IntroductionFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final View rootView = inflater.inflate(
            R.layout.introductionform_layout, container, false);
return  rootView;

public class RequirementFragment extends Fragment 
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final View rootView = inflater.inflate(
            R.layout.requirementFragment_layout, container, false);
return  rootView;
}
}

} }

RequirementFragment.java

public class IntroductionFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final View rootView = inflater.inflate(
            R.layout.introductionform_layout, container, false);
return  rootView;

public class RequirementFragment extends Fragment 
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final View rootView = inflater.inflate(
            R.layout.requirementFragment_layout, container, false);
return  rootView;
}
}

试试看

在RequirementFragment.java中添加onResume方法，如下所示：

public class RequirementFragment extends Fragment 
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final View rootView = inflater.inflate(
            R.layout.requirementFragment_layout, container, false);
    return  rootView;
   }

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

    Toast.makeText(getActivity(), "Just check if you see this every time", Toast.LENGTH_SHORT).show();

  }

}

---

现在运行代码。如果您每次来回都会收到祝酒词，那么我们可以继续。

您可以在活动级别将选择存储在变量中，然后在onCreateView中按要求更改布局根据此变量更改布局，或者您也可以尝试@AtulOHolic Sir我将微调器选择项存储在变量中“IntroductionFragment”但我如何在“RequirementFragment”中进行比较，因为“RequirementFragment”已在“HomeLoanTabMainActivity”中构造，并且onCreateView不会再次调用。是的，请尝试在onResume方法中访问它。我发现这个-@AtulOHolic谢谢你的快速回复，但是你能在我上面的示例代码中添加一些代码吗…如果我知道会显示Toast消息，那么我如何根据“onResume方法”中存储的变量更改“RequirementFragment”的布局..您能解释一下布局中需要做哪些更改吗？另外，您需要将所选内容保存在HomeLoanTabMainActivity中，以便在RequirementFragment中也可以访问。在恢复时检查该变量的值，并相应地更改布局。如果不清楚，请告诉我。实际上“IntroductionFragment”包含一个带有两个项目的微调器（比如说“Select your memberType”=>1.免费会员2.付费会员），然后根据选择类型，“RequirementFragment”必须显示相应的表单。请注意在“RequirementFragment”中有两种不同的表格必须由用户填写…有意义吗？