使用 ViewPager 和 Fragments [英] Working with ViewPager and Fragments

问题描述

我是一名初级 Android 开发人员.我正试图了解 ViewPager.在我尝试使用此示例之前:

I am a beginner Android developer. I am trying to get my head around the ViewPager. Before I was trying to work with this example:

http://mobile.tutsplus.com/tutorials/android/android-user-interface-design-horizo​​ntal-view-paging/

我有视图工作，但无法在其中工作，我被告知我需要在 ViewPager 中使用 Fragments.

I had the views working, but could not get functionality working within that, and I was told that I need to use Fragments within the ViewPager.

我改为使用本教程:

http://tamsler.blogspot.co.uk/2011/11/android-viewpager-and-fragments-part-ii.html

我已经掌握了 ViewPager 和 Fragment 工作的基础知识:

I have got the basics of a ViewPager with a Fragment working:

FragmentPagerActivity.java

FragmentPagerActivity.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;

public class FragmentPagerActivity extends FragmentActivity {

    private static final int NUMBER_OF_PAGES = 10;

    private ViewPager mViewPager;
    private MyFragmentPagerAdapter mMyFragmentPagerAdapter;

    public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         mViewPager = (ViewPager) findViewById(R.id.viewpager);
         mMyFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
         mViewPager.setAdapter(mMyFragmentPagerAdapter);
    }

    private static class MyFragmentPagerAdapter extends FragmentPagerAdapter {

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

         @Override
         public Fragment getItem(int index) { 

              return PageFragment.newInstance("My Message " + index);
         }  

         @Override 
         public int getCount() {

              return NUMBER_OF_PAGES;
         }
    }
}

PageFragment.java:

PageFragment.java:

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class PageFragment extends Fragment {

    public static PageFragment newInstance(String title) {

        PageFragment pageFragment = new PageFragment();
        Bundle bundle = new Bundle();
        bundle.putString("title", title);
        pageFragment.setArguments(bundle);
        return pageFragment;
    }

    @Override  
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override  
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment, container, false);
        TextView textView = (TextView) view.findViewById(R.id.textView1);
        textView.setText(getArguments().getString("title"));
        return view;
    }
}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
<android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

片段.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

我希望能够用我自己的 7 个已经存在的布局替换 ViewPager 中的当前布局，并使用 Fragments 向布局添加功能.我可以用我已经拥有的代码以及为使其正常工作而进行的更改做什么?

I want to be able to replace the current layout within the ViewPager with 7 of my own layouts that already exist and add functionality to the layouts using Fragments. What can I do with the code that I already have and the changes to make to get this properly working?

如果网上也有任何带有片段的 ViewPager 示例，而不是像 Adroid Developers 博客中那样简单地介绍一下，我将非常感激.

If there are any examples of a ViewPager with Fragments available online as well rather than just going briefly over it like the do in the Adroid Developers blog, I will be very grateful.

推荐答案

在你的 MyFragmentPagerAdapter 中声明这个:

Declare this inside your MyFragmentPagerAdapter:

private Fragment[] fragments = new Fragment[] { new Fragment1(),Fragment2(),Fragment3(),Fragment4(),Fragment5()};

然后像这样实现 getItem 方法:

then implement getItem method like this:

 @Override  
         public Fragment getItem(int index) {  

              return fragments[index];
         } 

每个片段都有自己的类和布局:

and for each fragment have it is own class and layout:

public class Fragment1 extends Fragment { 
   //your code here
}

这篇关于使用 ViewPager 和 Fragments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IT屋！