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Android:简单实现ViewPager+TabHost+TabWidget实现导航栏导航和滑动切换

发布时间:2015-09-01 21:00:05
viewPager是v4包里的一个组件,可以实现滑动显示多个界面。android也为viewPager提供了一个adapter,此adapter最少要重写4个方法: public int getCount() public boolea ...

Android:简单实现ViewPager+TabHost+TabWidget实现导航栏导航和滑动切换

     viewPager是v4包里的一个组件,可以实现滑动显示多个界面。

android也为viewPager提供了一个adapter,此adapter最少要重写4个方法:

     public int getCount()

     public boolean isViewFromObject(View view, Object o)

     public void destroyItem(ViewGroup container, int position, Object object)

   public Object instantiateItem(ViewGroup container, int position)

    这些方法的作用我就不说了,在代码里面有详细的解释。

    接下来就直接上代码吧!!

 

MainActivity.java

 1 package com.example.administrator.viewpagerdemo; 2  3 import android.app.Activity; 4 import android.os.Bundle; 5 import android.support.v4.view.PagerAdapter; 6 import android.support.v4.view.ViewPager; 7 import android.view.LayoutInflater; 8 import android.view.View; 9 import android.view.ViewGroup; 10 import android.widget.TabHost; 11 import android.widget.TabWidget; 12  13 import java.util.ArrayList; 14 import java.util.List; 15  16  17 public class MainActivity extends Activity { 18  19   private ViewPager viewPager = null; 20   private List<View> viewContainter = new ArrayList<View>();  //存放容器 21   private ViewPagerAdapter viewPagerAdapter = null;  //声明适配器 22  23   private TabHost mTabHost = null; 24   private TabWidget mTabWidget = null; 25  26   @Override 27   protected void onCreate(Bundle savedInstanceState) { 28     super.onCreate(savedInstanceState); 29     setContentView(R.layout.activity_main); 30     initMyTabHost(); //初始化TabHost 31     // 绑定组件 32     viewPager = (ViewPager) findViewById(R.id.viewpager); 33     initViewPagerContainter(); //初始viewPager 34     viewPagerAdapter = new ViewPagerAdapter(); 35     //设置adapter的适配器 36     viewPager.setAdapter(viewPagerAdapter); 37     //设置viewPager的** 38     viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { 39       @Override 40       public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 41  42       } 43       //当 滑动 切换时 44       @Override 45       public void onPageSelected(int position) { 46         mTabWidget.setCurrentTab(position); 47       } 48       @Override 49       public void onPageScrollStateChanged(int state) { 50  51       } 52     }); 53     //TabHost的监听事件 54     mTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { 55       @Override 56       public void onTabChanged(String tabId) { 57         if(tabId.equals("tab1")){ 58           viewPager.setCurrentItem(0); 59         }else if (tabId.equals("tab2")){ 60           viewPager.setCurrentItem(1); 61         }else if (tabId.equals("tab3")){ 62           viewPager.setCurrentItem(2); 63         }else{ 64           viewPager.setCurrentItem(3); 65         } 66       } 67     }); 68  69     //解决开始时不显示viewPager 70     mTabHost.setCurrentTab(1); 71     mTabHost.setCurrentTab(0); 72   } 73  74   //初始化TabHost 75   public void initMyTabHost(){ 76     //绑定id 77     mTabHost = (TabHost) findViewById(android.R.id.tabhost); 78     mTabHost.setup(); 79     mTabWidget = mTabHost.getTabWidget(); 80     /** 81      * newTabSpec()  就是给每个Tab设置一个ID 82      * setIndicator()  每个Tab的标题 83      * setCount()    每个Tab的标签页布局 84     */ 85     mTabHost.addTab(mTabHost.newTabSpec("tab1").setContent(R.id.tab1).setIndicator("第一页")); 86     mTabHost.addTab(mTabHost.newTabSpec("tab2").setContent(R.id.tab2).setIndicator("第二页")); 87     mTabHost.addTab(mTabHost.newTabSpec("tab3").setContent(R.id.tab3).setIndicator("第三页")); 88     mTabHost.addTab(mTabHost.newTabSpec("tab4").setContent(R.id.tab4).setIndicator("第四页")); 89   } 90  91   //初始化viewPager 92   public void initViewPagerContainter(){ 93     //建立四个view的样式,并找到他们 94     View view_1 = LayoutInflater.from(getApplicationContext()).inflate(R.layout.viewpager_view_1,null); 95     View view_2 = LayoutInflater.from(getApplicationContext()).inflate(R.layout.viewpager_view_2,null); 96     View view_3 = LayoutInflater.from(getApplicationContext()).inflate(R.layout.viewpager_view_3,null); 97     View view_4 = LayoutInflater.from(getApplicationContext()).inflate(R.layout.viewpager_view_4,null); 98     //加入ViewPage的容器 99     viewContainter.add(view_1);100     viewContainter.add(view_2);101     viewContainter.add(view_3);102     viewContainter.add(view_4);103   }104 105   //内部类实现viewpager的适配器106   private class ViewPagerAdapter extends PagerAdapter{107 108     //该方法 决定 并 返回 viewpager中组件的数量109     @Override110     public int getCount() {111       return viewContainter.size();112     }113 114     @Override115     public boolean isViewFromObject(View view, Object o) {116       return view == o;117     }118     //滑动切换的时候,消除当前组件119     @Override120     public void destroyItem(ViewGroup container, int position, Object object) {121       container.removeView(viewContainter.get(position));122     }123     //每次滑动的时候生成的组件124     @Override125     public Object instantiateItem(ViewGroup container, int position) {126       container.addView(viewContainter.get(position));127       return viewContainter.get(position);128     }129   }130 }

原标题:Android:简单实现ViewPager+TabHost+TabWidget实现导航栏导航和滑动切换

关键词:Android

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