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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