Android开发过程中，特别是新开的项目，底部状态栏的切换使用的频率非常的高，主要的实现方式有：
(1)、TabLayout + Fragment (2)、FragmentTabHost + Fragment (3)、BottomNavigationView + Fragment (4)、RidioGroup + Fragment这里我先介绍前面两种实现方式，后面两种后期再贴出实现方式。
一、使用TabLayout + Fragment + ViewPager实现
1、实现步骤：
(1)、布局文件中定义TabLayout控件 (2)、定义切换的每个Fragment布局文件 (3)、定义切换的每个Fragment的Java类 (4)、定义TabLayoutMainActivity类 (5)、效果图演示2、实现过程：
(1)、布局文件中定义TabLayout控件(activity_main.xml)
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.showly.bottomnavigationbardemo.TabLayoutMainActivity"> <android.support.v4.view.ViewPager android:id="@+id/viewpager_content_view" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:scrollbars="none" /> <android.support.design.widget.TabLayout android:id="@+id/tab_layout_view" android:layout_width="match_parent" android:layout_height="50dp" app:tabGravity="fill" app:tabIndicatorHeight="0dp" app:tabMode="fixed" app:tabSelectedTextColor="#FB8081" app:tabTextColor="#A0A0A0" /></LinearLayout>(2)、定义切换的每个Fragment布局文件(fragment_frist.xml)
这里有四个Tab类别(首页、娱乐、游戏、我的)，布局都类似，这里只贴出其中一个
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#fff" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="首页" android:textColor="#000"/></RelativeLayout>(3)、定义切换的每个Fragment的Java类(FristFragment.class)
这里的Java 类实现方式也相似，贴出其中一个
package com.showly.bottomnavigationbardemo.fragment;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 com.showly.bottomnavigationbardemo.R;public class FristFragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_frist, null); return view; }}(4)、定义TabLayoutMainActivity类(TabLayoutMainActivity.class)
package com.showly.bottomnavigationbardemo;import android.os.Bundle;import android.support.design.widget.TabLayout;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import com.showly.bottomnavigationbardemo.fragment.FourthlyFragment;import com.showly.bottomnavigationbardemo.fragment.FristFragment;import com.showly.bottomnavigationbardemo.fragment.SecondFragment;import com.showly.bottomnavigationbardemo.fragment.ThirtlyFragment;public class TabLayoutMainActivity extends AppCompatActivity { //未选中的Tab图片 private int[] unSelectTabRes = new int[]{R.drawable.i8live_menu_home_normal , R.drawable.i8live_menu_information_normal, R.drawable.i8live_menu_game_normal, R.drawable.i8live_menu_personl_normal}; //选中的Tab图片 private int[] selectTabRes = new int[]{R.drawable.i8live_menu_home_press, R.drawable.i8live_menu_information_press , R.drawable.i8live_menu_game_press, R.drawable.i8live_menu_personl_press}; //Tab标题 private String[] title = new String[]{"首页", "娱乐", "游戏", "我的"}; private ViewPager viewPager; private TabLayout tabLayout; private TabLayout.Tab tabAtOne; private TabLayout.Tab tabAttwo; private TabLayout.Tab tabAtthree; private TabLayout.Tab tabAtfour; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getSupportActionBar().hide();//隐藏掉整个ActionBar setContentView(R.layout.activity_main); initView(); initData(); initListener(); } private void initView() { viewPager = (ViewPager) findViewById(R.id.viewpager_content_view); tabLayout = (TabLayout) findViewById(R.id.tab_layout_view); //使用适配器将ViewPager与Fragment绑定在一起 viewPager.setAdapter(new MyFragmentPagerAdapter(getSupportFragmentManager())); //将TabLayout与ViewPager绑定 tabLayout.setupWithViewPager(viewPager); /* //设置方式一： //获取底部的单个Tab tabAtOne = tabLayout.getTabAt(0); tabAttwo = tabLayout.getTabAt(1); tabAtthree = tabLayout.getTabAt(2); tabAtfour = tabLayout.getTabAt(3); //设置Tab图片 tabAtOne.setIcon(R.drawable.i8live_menu_home_press); tabAttwo.setIcon(R.drawable.i8live_menu_information_normal); tabAtthree.setIcon(R.drawable.i8live_menu_game_normal); tabAtfour.setIcon(R.drawable.i8live_menu_personl_normal);*/ //设置方式二： for (int i = 0; i < title.length; i++) { if (i == 0) { tabLayout.getTabAt(0).setIcon(selectTabRes[0]); } else { tabLayout.getTabAt(i).setIcon(unSelectTabRes[i]); } } } private void initData() { } private void initListener() { //TabLayout切换时导航栏图片处理 tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { @Override public void onTabSelected(TabLayout.Tab tab) {//选中图片操作 for (int i = 0; i < title.length; i++) { if (tab == tabLayout.getTabAt(i)) { tabLayout.getTabAt(i).setIcon(selectTabRes[i]); viewPager.setCurrentItem(i); } } } @Override public void onTabUnselected(TabLayout.Tab tab) {//未选中图片操作 for (int i = 0; i < title.length; i++) { if (tab == tabLayout.getTabAt(i)) { tabLayout.getTabAt(i).setIcon(unSelectTabRes[i]); } } } @Override public void onTabReselected(TabLayout.Tab tab) { } }); } //自定义适配器 public class MyFragmentPagerAdapter extends FragmentPagerAdapter { public MyFragmentPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { if (position == 1) { return new SecondFragment();//娱乐 } else if (position == 2) { return new ThirtlyFragment();//游戏 } else if (position == 3) { return new FourthlyFragment();//我的 } return new FristFragment();//首页 } @Override public int getCount() { return title.length; } @Override public CharSequence getPageTitle(int position) { return title[position]; } }}(5)、效果图演示
二、使用FragmentTabHost+ Fragment + ViewPager实现
1、实现步骤：
(1)、布局文件中定义FragmentTabHost控件 (2)、定义底部菜单栏布局 (3)、定义切换的每个Fragment布局文件 (4)、定义切换的每个Fragment的Java类 (5)、切换按钮的图片 (6)、定义FragmentTabHostMainActivity类 (7)、效果图演示2、实现过程：
(1)、布局文件中定义FragmentTabHost控件(fragment_tabhost_activity.xml)
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#fff" android:orientation="vertical"> <android.support.v4.view.ViewPager android:id="@+id/vp_pager" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:scrollbars="none" /> <android.support.v4.app.FragmentTabHost android:id="@android:id/tabhost" android:layout_width="match_parent" android:background="#3000" android:layout_height="65dp"> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </android.support.v4.app.FragmentTabHost></LinearLayout>(2)、定义底部菜单栏布局(tab_content.xml)
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="2dp" android:orientation="vertical"> <ImageView android:id="@+id/iv_imageview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:background="@drawable/i8live_menu_home_normal" /> <TextView android:id="@+id/tv_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_marginTop="5dp" android:text="首页" /></LinearLayout>(3)、定义切换的每个Fragment布局文件(fragment_frist.xml)
这里有四个Tab类别(首页、娱乐、游戏、我的)，布局都类似，这里只贴出其中一个
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#fff" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="首页" android:textColor="#000"/></RelativeLayout>(4)、定义切换的每个Fragment的Java类(FristFragment.class)
这里的Java 类实现方式也相似，贴出其中一个
package com.showly.bottomnavigationbardemo.fragment;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 com.showly.bottomnavigationbardemo.R;public class FristFragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_frist, null); return view; }}(5)、切换按钮的图片(tab_main.xml)
这里有四个是相似的，只贴出其中一个
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <!-- 切换选中之后的图片--> <item android:drawable="@drawable/i8live_menu_home_press" android:state_selected="true"/> <!-- 未选中的图片--> <item android:drawable="@drawable/i8live_menu_home_normal"/></selector(6)、定义FragmentTabHostMainActivity类（FragmentTabHostMainActivity.class）
package com.showly.bottomnavigationbardemo;import android.graphics.Color;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.app.FragmentTabHost;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TabHost;import android.widget.TabWidget;import android.widget.TextView;import com.showly.bottomnavigationbardemo.fragment.FourthlyFragment;import com.showly.bottomnavigationbardemo.fragment.FristFragment;import com.showly.bottomnavigationbardemo.fragment.SecondFragment;import com.showly.bottomnavigationbardemo.fragment.ThirtlyFragment;import java.util.ArrayList;import java.util.List;public class FragmentTabHostMainActivity extends FragmentActivity implements ViewPager.OnPageChangeListener, TabHost.OnTabChangeListener { private int[] selectTabRes = new int[]{R.drawable.tab_main, R.drawable.tab_infomation , R.drawable.tab_game, R.drawable.tab_personal}; //Tab标题 private String[] title = new String[]{"首页", "娱乐", "游戏", "我的"}; private Class fragmentArry[] = {FristFragment.class, SecondFragment.class, ThirtlyFragment.class, FourthlyFragment.class}; private List<Fragment> fragmentList = new ArrayList(); private ViewPager viewPager; private FragmentTabHost tabHost; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_tabhost_activity); initView(); initData(); initListener(); } /** * 初始化Fragment并给ViewPager添加适配器 */ private void initVaper() { FristFragment fristFragment = new FristFragment(); SecondFragment secondFragment = new SecondFragment(); ThirtlyFragment thirtlyFragment = new ThirtlyFragment(); FourthlyFragment fourthlyFragment = new FourthlyFragment(); fragmentList.add(fristFragment); fragmentList.add(secondFragment); fragmentList.add(thirtlyFragment); fragmentList.add(fourthlyFragment); //ViewPager添加适配器 viewPager.setAdapter(new MyFragmentAdapter(getSupportFragmentManager(), fragmentList)); tabHost.getTabWidget().setDividerDrawable(null); } private void initView() { viewPager = (ViewPager) findViewById(R.id.vp_pager); tabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);//绑定tabhost tabHost.setup(this, getSupportFragmentManager(), R.id.vp_pager);//TabHost绑定viewpager //获取item的个数 int count = title.length; for (int i = 0; i < count; i++) { //设置每个TabHost布局 TabHost.TabSpec tabSpec = tabHost.newTabSpec(title[i]) .setIndicator(getTabItemView(i)); //item与fragment关联 tabHost.addTab(tabSpec, fragmentArry[i], null); tabHost.setTag(i); } //初始化TabHost文字颜色 upDateTab(tabHost); //给ViewPager设置适配器 initVaper(); } /** * 更新文字颜色。 * * @param mTabHost */ private void upDateTab(FragmentTabHost mTabHost) { for (int i = 0; i < mTabHost.getTabWidget().getChildCount(); i++) { TextView tv = (TextView) mTabHost.getTabWidget().getChildAt(i).findViewById(R.id.tv_item); if (mTabHost.getCurrentTab() == i) {//选中 tv.setTextColor(Color.parseColor("#FF5959")); } else {//不选中 tv.setTextColor(Color.parseColor("#777777")); } } } /** * 设置每个Item布局 */ private View getTabItemView(int i) { View view = LayoutInflater.from(this).inflate(R.layout.tab_content, null); ImageView itemImg = (ImageView) view.findViewById(R.id.iv_imageview); TextView itemText = (TextView) view.findViewById(R.id.tv_item); itemImg.setBackgroundResource(selectTabRes[i]); itemText.setText(title[i]); return view; } private void initData() { } private void initListener() { viewPager.addOnPageChangeListener(this); tabHost.setOnTabChangedListener(this); } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { TabWidget widget = tabHost.getTabWidget(); int oldFocusability = widget.getDescendantFocusability(); widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);//设置View覆盖子类控件而直接获得焦点 tabHost.setCurrentTab(position);//根据位置Postion设置当前的Tab widget.setDescendantFocusability(oldFocusability);//设置取消分割线 } @Override public void onPageScrollStateChanged(int state) { } @Override public void onTabChanged(String tabId) { int position = tabHost.getCurrentTab(); viewPager.setCurrentItem(position);//把选中的Tab的位置赋给适配器，让它控制页面切换 upDateTab(tabHost);//设置TabHost文字颜色 } /** * 适配器 * */ public class MyFragmentAdapter extends FragmentPagerAdapter { List<Fragment> list; public MyFragmentAdapter(FragmentManager fm, List<Fragment> list) { super(fm); this.list = list; } @Override public Fragment getItem(int position) { return list.get(position); } @Override public int getCount() { return list.size(); } }}(7)、效果图演示
三、总结
这两种方式的实现已完成，实现起来相对还是比较简单的，后期有时间会把后面两种的实现方式补上。
Demo代码地址：底部公众号回复"底部状态栏切换"即可获取。
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