android实现底部导航栏

底部导航栏我选择用FragmentTabHost+Fragment来实现，这个方法比较好用，代码量也不多

首先是开始的activity_main.xml

也可以直接在xml文件里面写

这xml文件就一个view加一个tab  view用来显示碎片，tab用来放置底部按钮的数量

再来是tab_foot.xml

这是每个底部按钮的布局设置的xml文件

再来是MainActivity的代码

package com.gjn.mynavigation; 
 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentTabHost; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.Window; 
import android.widget.ImageView; 
import android.widget.TabWidget; 
import android.widget.TextView; 
import android.widget.TabHost.OnTabChangeListener; 
import android.widget.TabHost.TabSpec; 
 
public class MainActivity extends FragmentActivity implements onTabChangeListener { 
 
 private FragmentTabHost mTabHost; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 requestWindowFeature(Window.FEATURE_NO_TITLE); 
 setContentView(R.layout.activity_main); 
 
 //初始化FragmentTabHost 
 initHost(); 
 //初始化底部导航栏 
 initTab(); 
 //默认选中 
 mTabHost.onTabChanged(TabDb.getTabsTxt()[0]); 
 } 
 
 private void initTab() { 
 String[] tabs = TabDb.getTabsTxt(); 
 for (int i = 0; i < tabs.length; i++) { 
  //新建TabSpec 
  TabSpec tabSpec = mTabHost.newTabSpec(TabDb.getTabsTxt()[i]); 
  //设置view 
  View view = LayoutInflater.from(this).inflate(R.layout.tabs_foot, null); 
  ((TextView) view.findViewById(R.id.foot_tv)).setText(TabDb.getTabsTxt()[i]); 
  ((ImageView) view.findViewById(R.id.foot_iv)).setImageResource(TabDb.getTabsImg()[i]); 
  tabSpec.setIndicator(view); 
  //加入TabSpec 
  mTabHost.addTab(tabSpec,TabDb.getFramgent()[i],null); 
 } 
 } 
  
 private void initHost() { 
 mTabHost = (FragmentTabHost) findViewById(R.id.main_tab); 
 //调用setup方法 设置view 
 mTabHost.setup(this, getSupportFragmentManager(),R.id.main_view); 
 //去除分割线 
 mTabHost.getTabWidget().setDividerDrawable(null); 
 //监听事件 
 mTabHost.setonTabChangedListener(this); 
 } 
 
 @Override 
 public void onTabChanged(String arg0) { 
 //从分割线中获得多少个切换界面 
 TabWidget tabw = mTabHost.getTabWidget(); 
 for (int i = 0; i < tabw.getChildCount(); i++) { 
  View v = tabw.getChildAt(i); 
  TextView tv = (TextView) v.findViewById(R.id.foot_tv); 
  ImageView iv = (ImageView) v.findViewById(R.id.foot_iv); 
  //修改当前的界面按钮颜色图片 
  if (i == mTabHost.getCurrentTab()) { 
  tv.setTextColor(getResources().getColor(R.color.tab_light_color)); 
  iv.setImageResource(TabDb.getTabsImgLight()[i]); 
  }else{ 
  tv.setTextColor(getResources().getColor(R.color.tab_color)); 
  iv.setImageResource(TabDb.getTabsImg()[i]); 
  } 
 } 
 } 
} 

其中TabDb类是用来设置导航栏的数据和图片切换时候的资源
 以下是TabDb类

package com.gjn.mynavigation; 
 
public class TabDb { 
  
 public static String[] getTabsTxt() { 
 String[] tabs = {"首页","交易","地点","我的"}; 
 return tabs; 
 } 
  
 public static Class[] getFramgent(){ 
 Class[] cls = {OneFm.class,TwoFm.class,ThreeFm.class,FourFm.class}; 
 return cls ; 
 } 
  
 public static int[] getTabsImg(){ 
 int[] img = {R.drawable.home1,R.drawable.glod1,R.drawable.xc1,R.drawable.user1}; 
 return img ; 
 } 
  
 public static int[] getTabsImgLight(){ 
 int[] img = {R.drawable.home2,R.drawable.glod2,R.drawable.xc2,R.drawable.user2}; 
 return img ; 
 } 
} 

到此，底部导航栏就算是完全实现了。

现在来实现顶部导航栏，看了许多最后使用了RadioGroup+ViewPager来实现 
首先是为第一个碎片设计一个xml布局：fm_one.xml

 设置顶部导航栏和显示view
之后是导航栏的每个项的布局

 tab_rb.xml

其中设置selector文件来控制点击和未点击的状态

tab_rb_selector.xml

 设置了点击和默认的时候的显示状态
最后来实现OneFm类

package com.gjn.mynavigation; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.support.v4.view.ViewPager; 
import android.support.v4.view.ViewPager.OnPageChangeListener; 
import android.util.DisplayMetrics; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.HorizontalScrollView; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.RadioGroup.LayoutParams; 
import android.widget.RadioGroup.OnCheckedChangeListener; 
 
public class oneFm extends Fragment implements onPageChangeListener { 
 
 private View view; 
 private RadioGroup rg_; 
 private ViewPager vp_; 
 private HorizontalScrollView hv_; 
 private List newsList = new ArrayList(); 
 private oneFmAdapter adapter; 
 
 @Override 
 public View onCreateView(LayoutInflater inflater, 
 @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
 if (view == null) { 
  //初始化view 
  view = inflater.inflate(R.layout.fm_one, container,false); 
  rg_ = (RadioGroup) view.findViewById(R.id.one_rg); 
  vp_ = (ViewPager) view.findViewById(R.id.one_view); 
  hv_ = (HorizontalScrollView) view.findViewById(R.id.one_hv); 
  //设置RadioGroup点击事件 
  rg_.setonCheckedChangeListener(new onCheckedChangeListener() { 
 
  @Override 
  public void onCheckedChanged(RadioGroup group, int id) { 
   vp_.setCurrentItem(id); 
  } 
  } 
  //初始化顶部导航栏 
  initTab(inflater); 
  //初始化viewpager 
  initView(); 
 } 
  
 ViewGroup parent = (ViewGroup) view.getParent(); 
 if (parent != null) { 
  parent.removeView(view); 
 } 
 return view; 
 } 
  
 private void initView() { 
 List hTabs = HTabDb.getSelected(); 
 for (int i = 0; i < hTabs.size(); i++) { 
  OneFm1 fm1 = new OneFm1(); 
  Bundle bundle = new Bundle(); 
  bundle.putString("name", hTabs.get(i).getName()); 
  fm1.setArguments(bundle); 
  newsList.add(fm1); 
 } 
 //设置viewpager适配器 
 adapter = new oneFmAdapter(getActivity().getSupportFragmentManager(),newsList); 
 vp_.setAdapter(adapter); 
 //两个viewpager切换不重新加载 
 vp_.setOffscreenPageLimit(2); 
 //设置默认 
 vp_.setCurrentItem(0); 
 //设置viewpager监听事件 
 vp_.setonPageChangeListener(this); 
 } 
  
 private void initTab(LayoutInflater inflater) { 
 List hTabs = HTabDb.getSelected(); 
 for (int i = 0; i < hTabs.size(); i++) { 
  //设置头部项布局初始化数据 
  RadioButton rbButton = (RadioButton) inflater.inflate(R.layout.tab_rb, null); 
  rbButton.setId(i); 
  rbButton.setText(hTabs.get(i).getName()); 
  LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, 
  LayoutParams.WRAP_CONTENT); 
  //加入RadioGroup 
  rg_.addView(rbButton,params); 
 } 
 //默认点击 
 rg_.check(0); 
 } 
 @Override 
 public void onPageScrollStateChanged(int arg0) { 
 
 } 
 @Override 
 public void onPageScrolled(int arg0, float arg1, int arg2) { 
 
 } 
 @Override 
 public void onPageSelected(int id) { 
 setTab(id); 
 } 
  
 private void setTab(int id) { 
 RadioButton rbButton = (RadioButton) rg_.getChildAt(id); 
 //设置标题被点击 
 rbButton.setChecked(true); 
 //偏移设置 
 int left = rbButton.getLeft(); 
 int width = rbButton.getMeasuredWidth(); 
 DisplayMetrics metrics = new DisplayMetrics(); 
 getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics); 
 int screenWidth = metrics.widthPixels; 
 //移动距离= 左边的位置 + button宽度的一半 - 屏幕宽度的一半 
 int len = left + width / 2 - screenWidth / 2; 
 //移动 
 hv_.smoothScrollTo(len, 0); 
 } 
} 

其中有两个数据类和一个碎片类

数据类

HTab.java

package com.gjn.mynavigation; 
 
 
public class HTab { 
 private String name; 
 
 public HTab(String name) { 
 super(); 
 this.setName(name); 
 } 
 
 public String getName() { 
 return name; 
 } 
 
 public void setName(String name) { 
 this.name = name; 
 } 
} 

 HTabDb.java

package com.gjn.mynavigation; 
 
import java.util.ArrayList; 
import java.util.List; 
 
public class HTabDb { 
 private static final List Selected = new ArrayList(); 
 static{ 
 Selected.add(new HTab("今日")); 
 Selected.add(new HTab("头条")); 
 Selected.add(new HTab("娱乐")); 
 Selected.add(new HTab("财经")); 
 Selected.add(new HTab("军事")); 
 Selected.add(new HTab("科技")); 
 Selected.add(new HTab("时尚")); 
 Selected.add(new HTab("体育")); 
 } 
  
 public static List getSelected() { 
 return Selected; 
 } 
} 

碎片类
OneFm1.java

package com.gjn.mynavigation; 
 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 
 
public class OneFm1 extends Fragment { 
 
 private String name; 
 
 @Override 
 public void setArguments(Bundle args) { 
 name = args.getString("name"); 
 } 
 
 @Override 
 public View onCreateView(LayoutInflater inflater, 
 @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
 View view = inflater.inflate(R.layout.fragment, container,false); 
 ((TextView) view.findViewById(R.id.fm_text)).setText(name); 
 return view; 
 } 
} 

这样就把顶部的导航栏加入到了第一个fragment里面并且实现了切换功能
最后把fragment.xml贴下，就是每个碎片最默认的显示页面

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