如何在转到下一个片段时停止显示空白页面

时间:2017-12-09 07:40:05

标签: android android-fragments android-viewpager

我所做的是先创建一个tapBar(Activity)。然后在Activity下,我有第一,第二和第三个片段。我试图从第一个片段移动到下一个片段,但我得到一个空白页面(因为它不是我在xml中设置的蓝色)。有什么建议吗?

活动

public class TabBar extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tabbar);
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        SimpleFragmentPagerAdapter adapter = new SimpleFragmentPagerAdapter(this, getSupportFragmentManager());
        viewPager.setAdapter(adapter);
        TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
        tabLayout.setupWithViewPager(viewPager);
    }
}

第一个片段

public class First extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.first, null);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Fragment fragment = new Next();
                FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.hide(First.this);
                fragmentTransaction.show(fragment);
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.commit();
            }
        });
    return rootView;
}

下一个片段

public class Next extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.next, container, false);
        return rootView;
    }
}

下一个片段XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/avoscloud_blue">
</RelativeLayout>

3 个答案:

答案 0 :(得分:3)

您应该添加.add(R.id.

  

FragmentTransaction add(int containerViewId,                   片段片段)

 button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) 
            {
                Next childFrag = new Next ();
                getFragmentManager().beginTransaction().add(R.id.frame_child_fragment, childFrag)
                .addToBackStack(null)
                .commit();
            }
        });

阅读Nested Fragments以获取更多信息。

修改

您应该设置默认标签

tabLayout.setupWithViewPager(viewPager);
viewPager.setCurrentItem(0); // 0 is FIRST 

FrameLayout

中创建 R.layout.first
<FrameLayout
        android:id="@+id/frame_child_fragment"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        />

答案 1 :(得分:1)

尝试使用此方法更改fragment

public void changeFragment() {
    Fragment fragment = new Next();
    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction transaction = fm.beginTransaction();
    transaction.replace(R.id.your_layout_id, fragment);
    transaction.commit();
}

答案 2 :(得分:1)

tansaction.replace()此方法适用于新片段,如果它不起作用而不是自定义寻呼机适配器并再次使用它。如果您不想创建寻呼机适配器,只需在xml中添加容器布局并将片段放入其中并在按钮上单击该片段