Android中fragment+viewpager实现布局

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public class FragmentThree extends Fragment { 
  @Nullable 
  @Override 
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     //引入布局文件 
    View view = inflater.inflate(R.layout.fragmentthree, null); 
    return view; 
  } 
} 

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
 
 
   
 

package com.bwei.fragment; 
 
import android.content.Context; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
 
import java.util.List; 
 
 
public class MyAdapter extends FragmentPagerAdapter { 
  private List fragments; 
  private Context context; 
  //构造方法 
  public MyAdapter(FragmentManager fm, List fragments, Context context) { 
    super(fm); 
    this.fragments = fragments; 
    this.cOntext= context; 
  } 
  //得到item条目 
  @Override 
  public Fragment getItem(int position) { 
    return fragments.get(position); 
  } 
 
  //得到数量 
  @Override 
  public int getCount() { 
    return fragments.size(); 
  } 
} 

package com.bwei.fragment; 
 
import android.graphics.Color; 
import android.os.Bundle; 
import android.support.annotation.IdRes; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.Toast; 
 
import java.util.ArrayList; 
import java.util.List; 
 
public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener,ViewPager.OnPageChangeListener { 
 
  private ViewPager vPager; 
  private List fragments; 
  private FragmentManager fm; 
  private RadioGroup mRadioGroup; 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    //初始化控件 
    initView(); 
    initDate(); 
  } 
 
  private void initView() { 
    vPager=(ViewPager) findViewById(R.id.pager); 
    vPager.setOnPageChangeListener(this); 
    mRadioGroup=(RadioGroup) findViewById(R.id.radioGroup1); 
    mRadioGroup.setOnCheckedChangeListener(this); 
  } 
 
  private void initDate() { 
    fragments=new ArrayList(); 
    //实例化Fragment 
    FragmentOne fragmentOne= new FragmentOne(); 
    FragmentTwo fragmentTwo = new FragmentTwo(); 
    FragmentThree fragmentThree = new FragmentThree(); 
 
    //添加到集合 
    fragments.add(fragmentOne); 
    fragments.add(fragmentTwo); 
    fragments.add(fragmentThree); 
 
    //得到getSupportFragmentManager()的管理器 
    fm = getSupportFragmentManager(); 
    //得到适配器 
    MyAdapter myAdapter = new MyAdapter(fm, fragments, this); 
    //设置适配器 
    vPager.setAdapter(myAdapter); 
  } 
 
  //ViewPager.OnPageChangeListener监听事件 
  @Override 
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
 
  } 
 
  @Override 
  public void onPageSelected(int position) { 
 
    for (int i = 0; i