• Android典型界面设计(7) ——DrawerLayout+Fragement+ViewPager+PagerTabStrip实现双导航


    一、问题描述

      在Android典型界面设计(3)的我们实现了双导航效果,即外层底部导航和内部区域的头部导航,如网易新闻等很多应用采用了这种导航,但Google提供DrawerLayout可实现抽屉式导航,建议使用DrawerLayout代替底部导航,下面我们就使用官方提供的DrawerLayout+Fragement+ViewPager+PagerTabStrip实现下图效果:

    二、本例相关技术

    1、 DrawerLayout 抽屉式导航

    2、 Fragment管理

    3、 ViewPager和PagerTabStrip的使用

    三、实现过程

      1、  考虑到向下兼容要使用V4和V7包

      V4建工程已经加入,需在项目中导入v7兼容包的android-support-v7-appcompat

      2、  MainActivity组件

      先看一下布局文件

    <android.support.v4.widget.DrawerLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <!-- 包含主要内容的 view -->
        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
        <!-- navigation drawer(抽屉式导航) -->
        <ListView android:id="@+id/left_drawer"
            android:layout_width="240dp"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:choiceMode="singleChoice"
            android:divider="@android:color/transparent"
            android:dividerHeight="0dp"
            android:background="#fff"/>
    </android.support.v4.widget.DrawerLayout>

      DrawerLayout有两个子视图(child view):一个FrameLayout用来包含主要内容(在运行时填入Fragment),和一个navigation drawer这里使用的ListView。

    navigation drawer部分必须使用android:layout_gravity属性指定它的horizontal gravity

    “start”表示左侧,”end”表示右侧

      3、  MainActivity代码:

    public class MainActivity extends ActionBarActivity implements 
    OnItemClickListener{
        private DrawerLayout drawerLayout;
        private ActionBarDrawerToggle toggle;
        private ListView navList;
        private FragmentManager fm;
        private List<Fragment> fragments;
        private ArrayAdapter<String> adapter;
        private ActionBar actionBar;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            drawerLayout=(DrawerLayout)super.findViewById(R.id.drawer_layout);
            navList=(ListView)super.findViewById(R.id.left_drawer);
            navList.setOnItemClickListener(this);
            fragments=new ArrayList<Fragment>();
            fm=super.getSupportFragmentManager();
            initListView();
            initActionBar();
            initDrawerLayout();
            initFragments();
        }
                private String[] tabs=new String[]{"新闻","阅读 ","视听","发现","我的设置 "};
            /**
        初始化drawer的item列表。这要根据你的app内容来处理,但是一个navigation drawer通常由一个ListView组成,所以列表应该通过一个Adapter填入。
    */
        private void initListView(){
            adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,
                    tabs);
            navList.setAdapter(adapter);
        }
        private void initFragments(){
            NewsFragment newsFragment=new NewsFragment();
            fragments.add(newsFragment);
            ReadFragment readFragment=new ReadFragment();
            fragments.add(readFragment);
            VideoFragment videoFragment=new VideoFragment();
            fragments.add(videoFragment);
            FoundFragment foundFragment=new FoundFragment();
            fragments.add(foundFragment);
            OwnerFragment ownerFragment=new OwnerFragment();
            fragments.add(ownerFragment);
            setFragments(0);
        }
        private void setFragments(int position){
            fm.beginTransaction().replace(R.id.content_frame, 
                    fragments.get(position),"t"+position).commit();
        }
        private void initActionBar(){
            actionBar=super.getSupportActionBar();
            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setIcon(new ColorDrawable(0));
            actionBar.setTitle(tabs[0]);    
        }
        private void initDrawerLayout(){
            toggle=new ActionBarDrawerToggle(this, drawerLayout, 
                    R.drawable.com_btn, R.string.drawer_open,
                    R.string.drawer_closed){
                        /** 当drawer处于完全关闭的状态时调用 */
                        @Override
                        public void onDrawerClosed(View drawerView) {
                            super.onDrawerClosed(drawerView);
                        }
                           /** 当drawer处于完全打开的状态时调用 */
                        @Override
                        public void onDrawerOpened(View drawerView) {
                            super.onDrawerOpened(drawerView);
                        }
                
            };
            // 设置drawer触发器为DrawerListener
            drawerLayout.setDrawerListener(toggle);
        }
        private void toggleNav(){
            if(drawerLayout.isDrawerOpen(Gravity.START)){
                drawerLayout.closeDrawer(Gravity.START);
            }else{
                drawerLayout.openDrawer(Gravity.START);
            }
            
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
                    getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }
      @Override
       public boolean onOptionsItemSelected(MenuItem item){
          switch(item.getItemId()){
              case android.R.id.home:
              toggleNav();
              break;
          }
          return true;
      }

      4、  NewsFragment组件

    public class NewsFragment extends Fragment {
        private ViewPager mViewPager;
        private List<String> tabs;
        private List<Fragment> fragmentList;
        private NewsFragmentPagerAdapter adapter;
    
        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onActivityCreated(savedInstanceState);
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
        }
    
        private View view;
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            if(view==null){
                view=inflater.inflate(R.layout.news_fragment, null);
                mViewPager=(ViewPager)view.findViewById(R.id.pager);
                initViewPager();
            }
            ViewGroup parent=(ViewGroup)view.getParent();
            if(parent!=null) parent.removeView(view);
            return view;
        }
        private void initViewPager(){
            setTabs();
            setFragments();
            adapter=new NewsFragmentPagerAdapter(super.getActivity().getSupportFragmentManager(), 
                    fragmentList, tabs);
            mViewPager.setAdapter(adapter);
        }
        
        private void setFragments(){
            fragmentList=new ArrayList<Fragment>();
            for(int i=0;i<tabs.size();i++){
                NewsChannelFragment fragment=new NewsChannelFragment();
                Bundle bundle=new Bundle();
                bundle.putString("title", tabs.get(i)+"区域");
                fragment.setArguments(bundle);
                fragmentList.add(fragment);
                
            }
        }
        private void setTabs(){
            tabs=new ArrayList<String>();
            tabs.add("头条");
            tabs.add("娱乐");
            tabs.add("体育");
            tabs.add("财经");
            tabs.add("热点");
            tabs.add("科技");
        }
        @Override
        public void onDestroyView() {
            // TODO Auto-generated method stub
            super.onDestroyView();
        }
    
    }

    NewsFragment的布局文件:

    <android.support.v4.view.ViewPager
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        <android.support.v4.view.PagerTabStrip
            android:id="@+id/pager_tab_strip"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            android:background="#33b5e5"
            android:textColor="#fff"
            android:paddingTop="4dp"
            android:paddingBottom="4dp" />
    </android.support.v4.view.ViewPager>

    NewsFragmentPagerAdapter代码:

    public class NewsFragmentPagerAdapter extends FragmentPagerAdapter {
        private List<String> tabs;
        private List<Fragment> fragmentList;
        public NewsFragmentPagerAdapter(FragmentManager fm,
    List<Fragment> fragmentList,List<String> tabs) {
            super(fm);
            this.tabs=tabs;
            this.fragmentList=fragmentList;
            
        }
        @Override
        public Fragment getItem(int idx) {
            return fragmentList.get(idx);
        }
    
        @Override
        public int getCount() {
            return fragmentList.size();
        }
        @Override
        public CharSequence getPageTitle(int position) {
            return tabs.get(position);
        }
    }

      5、  ReadFragment代码(其他Fragment也简单处理同ReadFragment基本相同)

    public class ReadFragment extends Fragment {
    
        @Override
        public void onAttach(Activity activity) {
            // TODO Auto-generated method stub
            super.onAttach(activity);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
            TextView tvTitle=new TextView(super.getActivity());
            tvTitle.setText("阅读");
            tvTitle.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
            tvTitle.setBackgroundColor(Color.WHITE);
            return tvTitle;
        }
        @Override
        public void setArguments(Bundle args) {
            // TODO Auto-generated method stub
            super.setArguments(args);
        }
    
    }

    6、样式文件values/styles.xm 

        <style name="AppTheme" parent="@style/Theme.AppCompat.Light">
            <item name="actionBarStyle">@style/ActionBar.Solid</item>
            <item name="homeAsUpIndicator">@drawable/com_btn</item> 
            <item name="titleTextStyle">@style/ActionBar_TitleStyle</item>
        </style>
        <style name="ActionBar.Solid" parent="@style/Widget.AppCompat.Light.ActionBar.Solid">
            <item name="android:background">@drawable/ab_background</item>
            <item name="backgroundSplit">@drawable/ab_bottom_solid</item>    
        </style>
             <style name="ActionBar_TitleStyle">  
            <item name="android:textSize">18sp</item>
            <item name="android:textColor">#ffffff</item>  
    </style>
    values-v14/styles.xml
        <style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">
        </style>
      <style name="AppTheme" parent="@style/Theme.AppCompat.Light">
            <item name="android:actionBarStyle">@style/ActionBar.Solid</item>
            <item name="android:homeAsUpIndicator">@drawable/com_btn</item>     
        </style>
        <style name="ActionBar.Solid" parent="@style/Widget.AppCompat.Light.ActionBar.Solid">
            <item name="android:background">@drawable/ab_background</item>
            <item name="android:backgroundSplit">@drawable/ab_bottom_solid</item>
            <item name="android:titleTextStyle">@style/ActionBar_TitleStyle</item>
        </style>
         <style name="ActionBar_TitleStyle">  
            <item name="android:textSize">18sp</item>
            <item name="android:textColor">#ffffff</item>  
        </style>

      想要了解更多内容的小伙伴,可以点击查看源码,亲自运行测试。

      疑问咨询或技术交流,请加入官方QQ群:JRedu技术交流 (452379712)

    作者:杰瑞教育
    出处:http://www.cnblogs.com/jerehedu/ 
    本文版权归烟台杰瑞教育科技有限公司和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。
     
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  • 原文地址:https://www.cnblogs.com/jerehedu/p/4778985.html
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