Fragment支持在不同的Activity中使用并且可以处理自己的输入事件以及生命周期方法等。可以看做是一个子Activity。
先看一下布局：
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
2 xmlns:tools="http://schemas.android.com/tools"
3 android:layout_width="match_parent"
4 android:layout_height="match_parent"
5 tools:context=".ViewPagerActivity" >
6
7 <android.support.v4.view.ViewPager
8 android:id="@+id/viewpager"
9 android:layout_width="wrap_content"
10 android:layout_height="wrap_content"
11 android:layout_gravity="center" >
12 </android.support.v4.view.ViewPager>
13
14 </LinearLayout>
主文件：ViewPagerActivity继承FragmentActivity
1 package com.example.viewpagerdemo;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import android.os.Bundle;
7 import android.support.v4.app.Fragment;
8 import android.support.v4.app.FragmentActivity;
9 import android.support.v4.view.ViewPager;
10
11 import com.example.adapter.fragmentAdapter;
12
13 public class ViewPagerActivity extends FragmentActivity {
14
15 @Override
16 protected void onCreate(Bundle savedInstanceState) {
17 super.onCreate(savedInstanceState);
18 setContentView(R.layout.activity_view_pager);
19 List<Fragment> fragments = new ArrayList<Fragment>();
20 for (int i = 0; i < 3; i++) {
21 Fragment f = new ButtonFragment();
22 fragments.add(f);
23 }
24 ViewPager vp = (ViewPager) findViewById(R.id.viewpager);
25 fragmentAdapter fa = new fragmentAdapter(getSupportFragmentManager(),
26 fragments);
27 vp.setAdapter(fa);
28 vp.setCurrentItem(0);
29 }
30 }
新建fragmentAdapter继承FragmentPagerAdapter并未写出实现的方法
1 package com.example.adapter;
2
3 import java.util.List;
4
5 import android.support.v4.app.Fragment;
6 import android.support.v4.app.FragmentManager;
7 import android.support.v4.app.FragmentPagerAdapter;
8
9 public class fragmentAdapter extends FragmentPagerAdapter {
10 private List<Fragment> fragments;
11 private FragmentManager fm;
12
13 public fragmentAdapter(FragmentManager fm, List<Fragment> fragments) {
14 super(fm);
15 this.fragments = fragments;
16
17 }
18
19 public fragmentAdapter(FragmentManager fm) {
20 super(fm);
21 this.fm = fm;
22 }
23
24 @Override
25 public Fragment getItem(int arg0) {
26 return fragments.get(arg0);
27 }
28
29 @Override
30 public int getCount() {
31 return fragments.size();
32 }
33
34 }
定义要展示的fragment内容，在这只放一个Button
1 package com.example.viewpagerdemo;
2
3 import android.os.Bundle;
4 import android.support.v4.app.Fragment;
5 import android.view.LayoutInflater;
6 import android.view.View;
7 import android.view.ViewGroup;
8 import android.widget.TextView;
9
10 public class ButtonFragment extends Fragment {11 private View rootView; 12
13 @Override
14 public View onCreateView(LayoutInflater inflater, ViewGroup container,
15 Bundle savedInstanceState) {
16 rootView = inflater.inflate(R.layout.guide1, container, false);
17 return rootView;
18 }
19 }
至此实现3个含有Button可以左右切换了