问题描述
我使用ViewPager
创建向左滑动的片段,现在我想在每个片段页面中插入片段.
I use ViewPager
to create fragments that swipe left and now I want insert fragments into each fragment page.
activityMain.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
...
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="@+id/myviewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
<devlight.io.library.ntb.NavigationTabBar
android:id="@+id/ntb_horizontal"
app:ntb_swiped="true"/>
</android.support.design.widget.CoordinatorLayout>
和这个: tab0_fragment.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:textSize="30sp"
android:gravity="center"
android:id="@+id/textView"
android:layout_centerHorizontal="true"
android:textColor="@android:color/holo_green_dark"
android:text="Social\nFragment"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:autoLink="web"
android:textSize="15sp"
android:layout_marginTop="10dp"
android:layout_centerHorizontal="true"
android:text="androidbelieve.com"
android:textColor="#000"
android:layout_below="@+id/textView"
android:textStyle="italic"/>
</RelativeLayout>
我在 mainActivity.java
final ViewPager viewPager = (ViewPager) findViewById(R.id.myviewpager);
viewPager.setAdapter(new PagerAdapter() {
...
...
}
我尝试通过片段布局在viewpager中打开一个屏幕.
I try open one screen in viewpager via fragment layout.
我尝试:
final ViewPager viewPager = (ViewPager) findViewById(R.id.myviewpager);
viewPager.setAdapter(new PagerAdapter() {
...
public Object instantiateItem(final ViewGroup container, final int position) {
if (position == 0)
{
final View view = LayoutInflater.from(getBaseContext()).inflate(R.layout.fragment_tab0, null, false);
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.myviewpager,new tab0Fragment()).commit();
container.addView(view);
return view;
}
else if (position == 1)
...
}
...
}
AND tab0Fragment.java
public class tab0Fragment extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_tab0,null);
}
}
我是android的菜鸟.如何更正此代码?
I am noob in android. how can correct this code?
解决方案:答案不是我的答案,但对我有很大帮助.
Solution:The answers was not my answer but that help me a lot.
@Mr.先生Rabbit ans @Amit Upadhyay我将顶级代码更改为此:
According @Mr. Rabbit ans @Amit Upadhyay I change top code to this:
@Override
public Object instantiateItem(final ViewGroup container, final int position) {
if (position == 0)
{
final View view = LayoutInflater.from(getBaseContext()).inflate(R.layout.fragment_tab0, null, false);
MyAdapter adapter = new MyAdapter(getSupportFragmentManager());
adapter.addFragment(new tab0Fragment(), getResources().getString(R.string.tab0));
container.addView(view);
return view;
}
else if (position == 1)
{
,并根据@Mr添加MyAdapter类.兔子的答案.
and also adding MyAdapter class according @Mr. Rabbit's answer.
希望可以帮助别人.
推荐答案
尝试分离出适配器和下面的代码.
Try to separate out your adapter and below code.
MyAdapter.java
MyAdapter.java
public class MyAdapter extends FragmentPagerAdapter{
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
创建片段
FragmentOne.java
FragmentOne.java
public class FragmentOne extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_one, container, false);
return view;
}
}
FragmentTwo.java
FragmentTwo.java
public class FragmentTwo extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_two, container, false);
return view;
}
}
在活动中像这样设置您的viewpager.
Setup your viewpager like this in your activity.
final ViewPager viewPager = (ViewPager) findViewById(R.id.myviewpager);
MyAdapter adapter = new MyAdapter(getSupportFragmentManager());
// Add your fragments in adapter.
FragmentOne fragmentOne = new FragmentOne();
adapter.addFragment(fragmentOne, getResources().getString(R.string.fragment_one_title));
FragmentTwo fragmentTwo = new FragmentTwo();
adapter.addFragment(fragmentTwo, getResources().getString(R.string.fragment_two_title));
viewPager.setAdapter(adapter);
然后最后用ViewPager设置NavigationTabBar.
Then finally set your NavigationTabBar with your ViewPager.
final NavigationTabBar navigationTabBar = (NavigationTabBar) findViewById(R.id.ntb_horizontal);
navigationTabBar.setViewPager(viewPager, 2);
这篇关于ANDROID:InstantiateItem方法中具有不同片段的ViewPager的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!