Android中fragment+viewpager实现布局

<?xml version="1.0" encoding="utf-8"?> 
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:app="http://schemas.android.com/apk/res-auto" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  tools:context="com.bwei.fragment.mainactivity"> 
 
  <android.support.v4.view.viewpager 
    android:id="@+id/pager" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" /> 
 
  <radiogroup 
    android:id="@+id/radiogroup1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignbottom="@+id/pager" 
    android:layout_centerhorizontal="true" 
    android:orientation="horizontal" 
    android:background="#ccc" 
    > 
 
    <radiobutton 
      android:id="@+id/radio0" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:checked="true" 
      android:button="@null" 
      android:layout_weight="1" 
      android:text="微信" 
      android:drawabletop="@mipmap/ic_launcher_round" 
      android:gravity="center" 
      /> 
 
    <radiobutton 
      android:id="@+id/radio1" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:button="@null" 
      android:layout_weight="1" 
      android:text="通讯录" 
      android:drawabletop="@mipmap/ic_launcher_round" 
      android:gravity="center" 
      /> 
 
    <radiobutton 
      android:id="@+id/radio2" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:button="@null" 
      android:layout_weight="1" 
      android:text="发现" 
      android:drawabletop="@mipmap/ic_launcher_round" 
      android:gravity="center" /> 
    <radiobutton 
      android:id="@+id/radio3" 
      android:layout_width="0dp" 
      android:layout_height="wrap_content" 
      android:button="@null" 
      android:layout_weight="1" 
      android:text="我的" 
      android:drawabletop="@mipmap/ic_launcher_round" 
      android:gravity="center"/> 
  </radiogroup> 
</relativelayout> 

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; 
  } 
} 

<?xml version="1.0" encoding="utf-8"?> 
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent"> 
 
 
  <textview 
    android:id="@+id/textview" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignparenttop="true" 
    android:layout_centerhorizontal="true" 
    android:layout_margintop="230dp" 
    android:text="one" /> 
</relativelayout> 

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<fragment> fragments; 
  private context context; 
  //构造方法 
  public myadapter(fragmentmanager fm, list<fragment> 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<fragment> 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<fragment>(); 
    //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 <fragments.size() ; i++) { 
      radiobutton radiobutton = (radiobutton) mradiogroup.getchildat(i); 
      if (i==position) { 
        radiobutton.setchecked(true); 
        //设置选中的颜色 
        radiobutton.setbackgroundcolor(color.red); 
      }else { 
        radiobutton.setchecked(false); 
        radiobutton.setbackgroundcolor(color.black); 
        radiobutton.setbackgroundcolor(color.black); 
      } 
    } 
  } 
 
  @override 
  public void onpagescrollstatechanged(int state) { 
 
  } 
 
  //radiogroup的监听事件 
 
  @override 
  public void oncheckedchanged(radiogroup radiogroup, @idres int i) { 
 
    for (int j = 0; j <fragments.size() ; j++) { 
      //得到radiobutton 
      radiobutton radiobutton = (radiobutton) mradiogroup.getchildat(j); 
      int id = radiobutton.getid(); 
      toast.maketext(this,id+"", toast.length_short).show(); 
      //判断radiobutton的id是否等于选中的id 
      if (radiobutton.getid()==i) { 
        //设置当前页 
        vpager.setcurrentitem(j); 
      } 
    } 
  } 
}