Android的分页活动:与ViewPager操作栏标签:不同的布局为每个标签 [英] Android Tabbed Activity: Action Bar Tabs with ViewPager: different layout for each tab
问题描述
我一共停电,我不熟悉的片段工作。
我与Eclipse助手创建了一个新的Android项目:
在这里创建的默认类的一个片段:
/ **
* A {@link FragmentPagerAdapter}返回对应片段
*章节/标签/页面。
* /
公共类SectionsPagerAdapter扩展FragmentPagerAdapter { 公共SectionsPagerAdapter(FragmentManager FM){
超(FM);
} @覆盖
公共片段的getItem(INT位置){
//的getItem被称为实例化片段为给定的页面。
//返回一个PlaceholderFragment(定义为静态内部类
//下面)。
返回PlaceholderFragment.newInstance(位置+ 1);
} @覆盖
公众诠释的getCount(){
//显示3总页数。
返回3;
} @覆盖
公共CharSequence的getPageTitle(INT位置){
区域设置L = Locale.getDefault();
开关(位置){
情况下0:
返回的getString(R.string.title_section1).toUpperCase(升);
情况1:
返回的getString(R.string.title_section2).toUpperCase(升);
案例2:
返回的getString(R.string.title_section3).toUpperCase(升);
}
返回null;
}
}/ **
*包含一个简单视图中的占位符片段。
* /
公共静态类PlaceholderFragment扩展片段{
/ **
*片段参数重新presenting本节号
*片段。
* /
静态INT秒;
私有静态最后弦乐ARG_SECTION_NUMBER =SECTION_NUMBER; / **
*返回该片段对于给定部分数的新实例。
* /
公共静态的newInstance PlaceholderFragment(INT sectionNumber){
秒= sectionNumber;
Log.i(ARG_SECTION_NUMBER,+秒);
PlaceholderFragment片段=新PlaceholderFragment();
捆绑ARGS =新包();
args.putInt(ARG_SECTION_NUMBER,sectionNumber);
fragment.setArguments(参数);
返回片段;
} 公共PlaceholderFragment(){
} @覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
INT JJJ =秒; Log.i(onCreateView,+秒);
查看rootView = inflater.inflate(R.layout.fragment_main,集装箱,
假);
返回rootView;
}
}
的
SectionsPagerAdapter用作适配器,并返回片段
3个片段都具有相同的布局
fragment_main.xml
如何能分配到3个片段不同的布局?
在PlaceholderFragment包含一个捆绑的SECTION_NUMBER:
args.putInt(ARG_SECTION_NUMBER,sectionNumber);
我可以使用此信息为determing至极布局在每个片段中显示?
//创建一个将返回一个片段为三个的适配器
//活性的主要部分。
mSectionsPagerAdapter =新SectionsPagerAdapter(
getSupportFragmentManager()); //设置的ViewPager与部分适配器。
mViewPager =(ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
您需要让不同类别的每一页。一个页面从片段延伸。您只需加载不同的布局XML为每个片段。
公共类FirstFragment扩展片段{@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout< yourxmlhere>中容器,
假);
返回rootView;
}}
您知道有片段,但你仍然适配器需要知道哪些页面(位置)是片段。这在下面的函数决定:
@覆盖
公共片段的getItem(INT位置){
开关(位置){
情况下0:
//第1页
返回新FirstFragment();
打破; 情况1:
//第2页
返回新SecondFragment();
打破;
默认:
//这个页面不存在
返回null;
}
请确保您已设置页面的正确数量!
@覆盖
公众诠释的getCount(){
//页面的数量适配器知道
返回< youramountofpages取代;
}
这应该让你和运行。
编辑:您可以只删除整个placeholderfragment类。它不再需要。
I have a total blackout, I am not familiar to work with fragments.
I created with the eclipse assistant a new Android project:
here a snippet of the created default class:
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class
// below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
static int sec;
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
sec = sectionNumber;
Log.i("ARG_SECTION_NUMBER"," "+sec);
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
int jjj = sec;
Log.i("onCreateView"," "+sec);
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
the SectionsPagerAdapter is used as an adapter and is returning Fragments the 3 fragments are having all the same layout
fragment_main.xml
how can different layouts assigned to the 3 fragments?
the PlaceholderFragment contains a Bundle with the section_number:
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
can I use this Info for determing wich layout to show in each fragment?
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
You need to make different classes for each page. A page extends from a Fragment. You can just load a different layout-xml for every fragment.
public class FirstFragment extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.<yourxmlhere>, container,
false);
return rootView;
}
}
You know have the fragment, but your adapter still needs to know which page (position) is which fragment. This is decided in the following function:
@Override
public Fragment getItem(int position) {
switch (position){
case 0:
//page 1
return new FirstFragment();
break;
case 1:
//page 2
return new SecondFragment();
break;
default:
//this page does not exists
return null;
}
Make sure you have set the correct amount of pages!
@Override
public int getCount() {
//the amount of pages your adapter knows
return <youramountofpages>;
}
This should get you up and running.
EDIT: You can just delete the whole placeholderfragment class. It is not needed anymore.
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