众所周知，android的底部菜单栏太重要，平时项目一般都是需要用到的，但是网上关于这方面的demo做得太丑了，实在惨不忍睹，所以这里便用RadioGroup+Fragment的方式写了一个，顺便美化了一下，需要的可以看下。

效果图：

项目结构

MainActivity.java

public class MainActivity extends AppCompatActivity { private FrameLayout frameLayout; private RadioGroup radioGroup; private Fragment[] mFragments; private int mIndex; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initFragment(); setRadioGroupListener(); } private void initFragment() { radioGroup = (RadioGroup) findViewById(R.id.radioGroup); frameLayout = (FrameLayout) findViewById(R.id.fl_content); HomeFragment homeFragment = new HomeFragment(); ShopFragment shopFragment = new ShopFragment(); LiveFragment liveFragment = new LiveFragment(); ShoppingCarFragment shoppingCarFragment = new ShoppingCarFragment(); MineFragment mineFragment = new MineFragment(); //添加到数组 mFragments = new Fragment[]{homeFragment, shopFragment, liveFragment, shoppingCarFragment, mineFragment}; //开启事务 FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); //添加首页 ft.add(R.id.fl_content, homeFragment).commit(); //默认设置为第0个 setIndexSelected(0); } private void setIndexSelected(int index) { if (mIndex == index) { return; } FragmentManager fragmentManager = getSupportFragmentManager(); FragmentTransaction ft = fragmentManager.beginTransaction(); //隐藏 ft.hide(mFragments[mIndex]); //判断是否添加 if (!mFragments[index].isAdded()) { ft.add(R.id.fl_content, mFragments[index]).show(mFragments[index]); } else { ft.show(mFragments[index]); } ft.commit(); //再次赋值 mIndex = index; } private void setRadioGroupListener() { radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup radioGroup, int i) { switch (i) { case R.id.rb_home: setIndexSelected(0); break; case R.id.rb_shop: setIndexSelected(1); break; case R.id.rb_live: setIndexSelected(2); break; case R.id.rb_shopping_car: setIndexSelected(3); break; case R.id.rb_mine: setIndexSelected(4); break; default: setIndexSelected(0); break; } } }); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { //仅当activity为task根（即首个启动activity）时才生效,这个方法不会改变task中的activity状态， // 按下返回键的作用跟按下HOME效果一样；重新点击应用还是回到应用退出前的状态； moveTaskToBack(false); return true; } return super.onKeyDown(keyCode, event); }}

Fragment,这里只列出HomeFragment的，其他都是一样

public class HomeFragment extends BaseFragment { public HomeFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view=inflater.inflate(R.layout.fragment_home,container,false); return view; } }

activity_main.xml布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <FrameLayout android:id="@+id/fl_content" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@+id/line" /> <View android:id="@+id/line" android:layout_width="match_parent" android:layout_height="@dimen/line_size" android:layout_above="@+id/radioGroup" android:background="#9e9e9e" /> <RadioGroup android:id="@+id/radioGroup" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:clickable="true" android:gravity="center" android:orientation="horizontal" android:padding="3dp"> <RadioButton android:id="@+id/rb_home" style="@style/RadioButtonStyle" android:checked="true" android:drawableTop="@drawable/btn_home" android:text="@string/home" /> <RadioButton android:id="@+id/rb_shop" style="@style/RadioButtonStyle" android:drawableTop="@drawable/btn_shop" android:text="@string/shop" /> <RadioButton android:id="@+id/rb_live" style="@style/RadioButtonStyle" android:drawableTop="@drawable/btn_live" android:text="@string/live" /> <RadioButton android:id="@+id/rb_shopping_car" style="@style/RadioButtonStyle" android:drawableTop="@drawable/btn_shopping_car" android:text="@string/shopping_car" /> <RadioButton android:id="@+id/rb_mine" style="@style/RadioButtonStyle" android:drawableTop="@drawable/btn_mine" android:text="@string/mine" /> </RadioGroup> </RelativeLayout>

RadioButton的样式

<style name="RadioButtonStyle"> <item name="android:layout_width">0dp</item> <item name="android:layout_weight">1</item> <item name="android:layout_height">match_parent</item> <item name="android:layout_marginRight">10dp</item> <item name="android:layout_marginLeft">10dp</item> <item name="android:button">@null</item> <item name="android:gravity">center</item> <item name="android:textColor">@color/color_radiobutton</item> <item name="android:textSize">10sp</item></style>

Demo下载地址：底部菜单栏

温馨提示：以后我自己写的demo都是用Android Studio写的了，用Eclipse的同学要的话需要自己改一下，时代在进步，工具也在升级！

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