Android RadioGroup Fragment Viewpager FragmentPagerAdapter 去哪网Fragment嵌套

RadioGroup中的各个选择器

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_checked="false" android:drawable="@color/bg_checked"/>
     <item android:state_checked="true" android:drawable="@color/bg_normal"/>
 </selector>

bg_selector.xml

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_checked="true" android:drawable="@mipmap/icon_favor_press"/>
     <item android:state_checked="false" android:drawable="@mipmap/icon_favor_normal"/>
 </selector>

favor_selector.xml

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_checked="true" android:drawable="@mipmap/icon_home_press"/>
     <item android:state_checked="false" android:drawable="@mipmap/icon_home_normal"/>
 </selector>

home_selector.xml

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_checked="true" android:drawable="@mipmap/icon_order_press"/>
     <item android:state_checked="false" android:drawable="@mipmap/icon_order_normal"/>
 </selector>

order_selector

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_checked="true" android:drawable="@mipmap/icon_setting_press"/>
     <item android:state_checked="false" android:drawable="@mipmap/icon_setting_normal"/>
 </selector>

setting_selector.xml

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_checked="true" android:drawable="@mipmap/icon_uc_press"/>
     <item android:state_checked="false" android:drawable="@mipmap/icon_uc_normal"/>
 </selector>

uc_selector.xml

各个Fragment

 public class FavorFragment extends Fragment{

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(android.R.layout.simple_list_item_1,null);
         return layout;
     }

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         view.setBackgroundColor(Color.BLUE);
         TextView tv = (TextView) view.findViewById(android.R.id.text1);
         tv.setText("收藏");
         tv.setTextSize(50);
     }
 }

FavorFragment.java

 public class OrderFragment extends Fragment{

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(android.R.layout.simple_list_item_1,null);
         return layout;
     }

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         view.setBackgroundColor(Color.RED);
         TextView tv = (TextView) view.findViewById(android.R.id.text1);
         tv.setText("订单");
         tv.setTextSize(50);
     }
 }

OrderFragment.java

 public class SettingFragment extends Fragment{

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(android.R.layout.simple_list_item_1,null);
         return layout;
     }

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         view.setBackgroundColor(Color.WHITE);
         TextView tv = (TextView) view.findViewById(android.R.id.text1);
         tv.setText("设置");
         tv.setTextSize(50);
     }
 }

SettingFragment.java

 public class UCFragment extends Fragment{

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(android.R.layout.simple_list_item_1,null);
         return layout;
     }

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         view.setBackgroundColor(Color.YELLOW);
         TextView tv = (TextView) view.findViewById(android.R.id.text1);
         tv.setText("个人中心");
         tv.setTextSize(50);
     }
 }

UCFragment.java

首页中还要显示一个ViewPager,一页机票，一页景点，可以左右滑动，自定义指示器

 public class JiPiaoFragment extends Fragment{

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(android.R.layout.simple_list_item_1,null);
         return layout;
     }

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         view.setBackgroundColor(Color.DKGRAY);
         TextView tv = (TextView) view.findViewById(android.R.id.text1);
         tv.setText("机票");
         tv.setTextSize(50);
     }
 }

JiPiaoFragment.java

 public class JingDianFragment extends Fragment{

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(android.R.layout.simple_list_item_1,null);
         return layout;
     }

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         view.setBackgroundColor(Color.MAGENTA);
         TextView tv = (TextView) view.findViewById(android.R.id.text1);
         tv.setText("景点");
         tv.setTextSize(50);
     }
 }

JingDianFragment.java

 public class HomeFragment extends Fragment implements ViewPager.OnPageChangeListener, RadioGroup.OnCheckedChangeListener {

     List<Fragment> mList = new ArrayList<>();

     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         mList.add(new JiPiaoFragment());
         mList.add(new JingDianFragment());
     }

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View layout = inflater.inflate(R.layout.fragment_home,null);
         return layout;
     }

     RadioGroup home_radioGroup;
     View view_indicator;
     ViewPager home_viewPager;

     @Override
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);

         home_radioGroup = (RadioGroup) view.findViewById(R.id.home_radioGroup);
         view_indicator =  view.findViewById(R.id.view_indicator);
         home_viewPager = (ViewPager) view.findViewById(R.id.home_viewPager);

         //在Fragment中设置FragmentPagerAdapter必须使用getChildFragmentManager
         FragmentManager fm = getChildFragmentManager();

         home_viewPager.setAdapter(new MyFragmentPagerAdapter(fm,mList));
         home_radioGroup.setOnCheckedChangeListener(this);
         home_viewPager.addOnPageChangeListener(this);
         //默认
         home_radioGroup.check(R.id.jipiao);
         initIndicator();
     }

     int width;
     public void initIndicator(){
         //指示器长度分一半
         width = getResources().getDisplayMetrics().widthPixels / 2;
         FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(width, FrameLayout.LayoutParams.MATCH_PARENT);
         view_indicator.setLayoutParams(params);
     }

     @Override
     public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
         FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) view_indicator.getLayoutParams();
         int left = (int) ((position + positionOffset)*width);
         params.setMargins(left,0,0,0);
         view_indicator.setLayoutParams(params);
     }

     @Override
     public void onPageSelected(int position) {
         home_radioGroup.check(position == 0?R.id.jipiao:R.id.jingdian);
     }

     @Override
     public void onPageScrollStateChanged(int state) {

     }

     @Override
     public void onCheckedChanged(RadioGroup group, int checkedId) {
         home_viewPager.setCurrentItem(checkedId == R.id.jipiao? 0 : 1);
     }
 }

HomeFragment.java

由于需要创建很多Fragment实例，这里用工厂模式或者反射方式创建

 public class FragmentUtils {

     //工厂模式

     public static final Fragment newInstance(int type){

         switch (type){
             case 0:
                 return new FavorFragment();
             case 1:
                 return new OrderFragment();
             case 2:
                 return new HomeFragment();
             case 3:
                 return new UCFragment();
             case 4:
                 return new SettingFragment();
         }
         return null;
     }

     //反射方式
     public static final String[] classNames = {"Favor","Order","Home","UC","Setting"};

     public static final Fragment getInstance(int type){
         try {
             //通过一个类的字符串对象，转换成一个class类类型
             Class className = Class.forName("com.example.lesson10_viewpager_fragmentpageradapter_childfragment."+classNames[type]+"Fragment");
             //通过类的类型去创建实例,必须有无参构造方法，并公开
             return (Fragment) className.newInstance();

         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         } catch (InstantiationException e) {
             e.printStackTrace();
         } catch (IllegalAccessException e) {
             e.printStackTrace();
         }

         return null;
     }
 }

FragmentUtils.java

 public class MyFragmentPagerAdapter extends FragmentPagerAdapter{

     List<Fragment> mList;
     public MyFragmentPagerAdapter(FragmentManager fm, List<Fragment> mList) {
         super(fm);
         this.mList = mList;
     }

     @Override
     public Fragment getItem(int position) {
         return mList.get(position);
     }

     @Override
     public int getCount() {
         return mList.size();
     }
 }

MyFragmentPagerAdapter.java

 public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

     RadioGroup radioGroup;
     Fragment[] fragments = new Fragment[5];

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
         radioGroup.setOnCheckedChangeListener(this);
         //默认显示首页
         showFragment(2);
         radioGroup.check(R.id.rb_home);

     }
     int currIndex = -1;

     public void showFragment(int index){
         if(index==currIndex){
             return;
         }
         FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
         if(currIndex != -1){
             ft.hide(fragments[currIndex]);
         }

         if(fragments[index]==null){
             //创建，用工厂类
             fragments[index] = FragmentUtils.newInstance(index);
             ft.add(R.id.fl_content,fragments[index]);
         }else{
             ft.show(fragments[index]);
         }

         currIndex = index;
         ft.commit();

     }

     @Override
     public void onCheckedChanged(RadioGroup group, int checkedId) {
         View view = group.findViewById(checkedId);
         String tag = view.getTag().toString();
         showFragment(Integer.parseInt(tag));
     }

 }

MainActivity.java