<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    >  <android.support.v4.view.ViewPager   android:id="@+id/view_pager"   android:layout_width="match_parent"   android:layout_height="0dp"   android:layout_weight="1"   >  </android.support.v4.view.ViewPager>  <TextView   android:id="@+id/division_line"   android:layout_width="match_parent"   android:layout_height="1dp"   android:background="#333333"   android:layout_above="@+id/rg_contain"   />  <RadioGroup   android:id="@+id/rg_contain"   android:layout_width="match_parent"   android:layout_height="48dp"   android:layout_alignParentBottom="true"   android:gravity="center"   android:background="#ffffff"   android:orientation="horizontal" >   <RadioButton    android:id="@+id/rb_wx"    style="@style/BottomTabStyle"    android:checked="true"    android:text="微信"    android:drawableTop="@drawable/tab_radiobutton_wx_selector"    android:textColor="@color/txt_tab_selector"    />   <RadioButton    android:id="@+id/rb_book"    style="@style/BottomTabStyle"    android:checked="true"    android:text="通訊錄"    android:drawableTop="@drawable/tab_radiobutton_book_selector"    android:textColor="@color/txt_tab_selector"    />   <RadioButton    android:id="@+id/rb_discover"    style="@style/BottomTabStyle"    android:checked="true"    android:text="發現"    android:drawableTop="@drawable/tab_radiobutton_discover_selector"    android:textColor="@color/txt_tab_selector"    />   <RadioButton    android:drawableTop="@drawable/tab_radiobutton_me_selector"    android:id="@+id/rb_me"    style="@style/BottomTabStyle"    android:checked="true"    android:text="我"    android:textColor="@color/txt_tab_selector"    />  </RadioGroup></LinearLayout>

mViewPager = (ViewPager) findViewById(R.id.view_pager);  mRGContain = (RadioGroup) findViewById(R.id.rg_contain);  mRBWX = (RadioButton) findViewById(R.id.rb_wx);  mRBBook = (RadioButton) findViewById(R.id.rb_book);  mRBDiscover = (RadioButton) findViewById(R.id.rb_discover);  mRBMe = (RadioButton) findViewById(R.id.rb_me);  //給圖標設置大小  Drawable drawableRbWX = mRBWX.getCompoundDrawables()[1];  drawableRbWX.setBounds(0,0, dp2px(24),dp2px(24));  mRBWX.setCompoundDrawables(null,drawableRbWX,null,null);  Drawable drawableRbBook = mRBBook.getCompoundDrawables()[1];  drawableRbBook.setBounds(0,0, dp2px(24), dp2px(24));  mRBBook.setCompoundDrawables(null,drawableRbBook,null,null);  Drawable drawableRbDiscover = mRBDiscover.getCompoundDrawables()[1];  drawableRbDiscover.setBounds(0,0, dp2px(24), dp2px(24));  mRBDiscover.setCompoundDrawables(null,drawableRbDiscover,null,null);  Drawable drawableRbMe = mRBMe.getCompoundDrawables()[1];  drawableRbMe.setBounds(0,0, dp2px(24), dp2px(24));  mRBMe.setCompoundDrawables(null,drawableRbMe,null,null); /**  * dp 轉 px  * @param dp  * @return  */ public int dp2px(int dp) {  // 1、獲取屏幕密度  float density = getApplicationContext().getResources().getDisplayMetrics().density;  // 2、進行乘法操作  return (int) (dp * density + 0.5); }

public abstract class BaseFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {  return initView(inflater,container,savedInstanceState); } public abstract View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState);}

public class WXFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {  View view = inflater.inflate(R.layout.wx_fragment, container,false);  return view; }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"> <TextView  android:gravity="center"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:text="微信"  android:textSize="15dp"  /></LinearLayout>

/** * 通訊錄界面 */public class BookFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {  View view = inflater.inflate(R.layout.book_fragment, container,false);  return view; }}/** * 發現界面 */public class DiscoverFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {  View view = inflater.inflate(R.layout.discover_fragment, container,false);  return view; }}/** * 我界面 */public class MeFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {  View view = inflater.inflate(R.layout.me_fragment, container,false);  return view; }}

package com.example.wxtest.fragment;import java.util.HashMap;public class MainFragmentFactory { private static HashMap<Integer, BaseFragment> mSavedFragment = new HashMap<Integer, BaseFragment>(); //根據position得到對應的fragment public static BaseFragment getFragment(int position) {  BaseFragment fragment = mSavedFragment.get(position);  if(fragment == null) {   switch (position) {    case 0:     fragment = new WXFragment();     break;    case 1:     fragment = new BookFragment();     break;    case 2:     fragment = new DiscoverFragment();     break;    case 3:     fragment = new MeFragment();     break;   }   //創建之后保存   mSavedFragment.put(position, fragment);  }  return fragment; } public static void deleteFragment(){  for (int i = 0 ; i < 4 ; i++){   mSavedFragment.remove(i);  } }}

 /**  * 適配器  */ class MainFragmentAdapter extends FragmentPagerAdapter {  public MainFragmentAdapter(FragmentManager fm) {   super(fm);  }  //根據position的值 返回對應的fragment對象  @Override  public Fragment getItem(int position) {   Fragment fragment = MainFragmentFactory.getFragment(position);   return fragment;  }  //返回ViewPager要顯示的item數量  @Override  public int getCount() {   return 4;  } }

 //給ViewPager設置數據  mViewPager.setAdapter(new MainFragmentAdapter(getSupportFragmentManager()));

//界面改變監聽  mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {   @Override   public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {   }   //當前選中頁面   @Override   public void onPageSelected(int position) {    switch (position){     case 0:      mRGContain.check(R.id.rb_wx);      break;     case 1:      mRGContain.check(R.id.rb_book);      break;     case 2:      mRGContain.check(R.id.rb_discover);      break;     case 3:      mRGContain.check(R.id.rb_me);      break;     default:      break;    }   }   @Override   public void onPageScrollStateChanged(int state) {   }  });

 //RadioGroup選中監聽  mRGContain.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {   @Override   public void onCheckedChanged(RadioGroup group, int checkedId) {    switch (checkedId){     case R.id.rb_wx: //微信      mViewPager.setCurrentItem(0,false);      break;     case R.id.rb_book: //通訊錄      mViewPager.setCurrentItem(1,false);      break;     case R.id.rb_discover: //發現      mViewPager.setCurrentItem(2,false);      break;     case R.id.rb_me: //我      mViewPager.setCurrentItem(3,false);      break;     default:      break;    }   }  });  //選中微信界面  mRGContain.check(R.id.rb_wx);