Android底部菜单栏（RadioGroup+Fragment）美化

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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