现在App基本的标配除了侧滑菜单,还有一个就是底部导航栏,常见的聊天工具QQ,微信,购物App都有底部导航栏,用户可以随便切换看不同的内容,说是情怀也好,用户体验也罢。我们开发的主要的还是讲的是如何如何实现其功能,网上实现的方式无外乎两种,一种是使用tabhost进行切换,一种是直接使用Fragment进行切换,底部导航栏的布局有的使用的是线性布局,有的是使用的RadioGroup,本文中是使用fragment+RadioGroup是实现的,看正文吧:

基础布局

其中主要低 底部导航栏,其他都没有什么,上面是一个Fragment自己替换一下即可,关于Fragment的使用可参考本人之前的博客;

activity_main.xml中的布局文件,由于样式比较多可以单独的放在style中的,鉴于方便查看,直接放在布局文件中,activity_main中的代码:

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context="com.example.googlebottomfragment.MainActivity" >
 
 
    <FrameLayout
        android:id="@+id/main_content"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />
 
    <RadioGroup
        android:id="@+id/tab_menu"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/mmfooter_bg"
        android:orientation="horizontal" >
 
        <RadioButton
            android:id="@+id/rbChat"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_weight="1"
            android:background="@drawable/tab_selector_checked_bg"
            android:button="@null"
            android:checked="true"
            android:drawableTop="@drawable/tab_selector_weixing"
            android:gravity="center_horizontal|bottom"
            android:paddingTop="2dp"
            android:text="微信"
            android:textColor="@color/tab_selector_tv_color" />
 
        <RadioButton
            android:id="@+id/rbAddress"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_weight="1"
            android:background="@drawable/tab_selector_checked_bg"
            android:button="@null"
            android:drawableTop="@drawable/tab_selector_tongxunlu"
            android:gravity="center_horizontal|bottom"
            android:paddingTop="2dp"
            android:text="通讯录"
            android:textColor="@color/tab_selector_tv_color" />
 
        <RadioButton
            android:id="@+id/rbFind"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_weight="1"
            android:background="@drawable/tab_selector_checked_bg"
            android:button="@null"
            android:drawableTop="@drawable/tab_selector_faxian"
            android:gravity="center_horizontal|bottom"
            android:paddingTop="2dp"
            android:text="发现"
            android:textColor="@color/tab_selector_tv_color" />
 
        <RadioButton
            android:id="@+id/rbMe"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_weight="1"
            android:background="@drawable/tab_selector_checked_bg"
            android:button="@null"
            android:drawableTop="@drawable/tab_selector_wo"
            android:gravity="center_horizontal|bottom"
            android:paddingTop="2dp"
            android:text="我"
            android:textColor="@color/tab_selector_tv_color" />
    </RadioGroup>
     
       
 
</LinearLayout>

  看下新建的布局和资源文件:

其中tab_selector_tv_color.xml主要是用于控制切换的时候显示下面字体的颜色:

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 
    <item android:state_checked="true" android:color="@android:color/white"/>
    <item android:state_checked="false" android:color="@android:color/darker_gray"/>
    <item android:color="@android:color/darker_gray"/>
 
</selector>

  其中tab_selector_checked_bg.xml布局文件选中的时候每个RadioButtton的背景颜色:

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
 
    <item
    android:state_checked="true"
    android:drawable="@drawable/tab_bg_halo"/>
     
</selector>

 其中tab_selector_weixing.xml主要是点击的时候显示不同的图片,一个是绿色的,一个是白色:

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_checked="false" android:drawable="@drawable/tab_weixin_normal"></item>
    <item android:state_checked="true" android:drawable="@drawable/tab_weixin_pressed"></item>
 
</selector>

  其中需要切换的chat.xml,address.xml,find.xml,me.xml都是一样的,其中chat.xml代码如下:

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<?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:orientation="vertical" >
     
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="微信"
        android:textSize="20sp"
      />
      <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="http://www.cnblogs.com/xiaofeixiang"
        android:textSize="15sp"
      />
     
 
</LinearLayout>

 实现Demo

MainActivity.java中的代码,主要的就是设置一下OnCheckedChangeListener,注意MainActivity中需要继承FragmentActivity:

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public void initView() {
    chat = new FragmentChat();
    getSupportFragmentManager().beginTransaction().replace(R.id.main_content, chat).commit();
    myTabRg = (RadioGroup) findViewById(R.id.tab_menu);
    myTabRg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 
 
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub
            switch (checkedId) {
            case R.id.rbChat:
                chat = new FragmentChat();
                getSupportFragmentManager().beginTransaction().replace(R.id.main_content, chat)
                        .commit();
                break;
            case R.id.rbAddress:
                if (address==null) {
                    address =new FragmentAddress();
                }
                Log.i("MyFragment", "FragmentAddress");
                getSupportFragmentManager().beginTransaction().replace(R.id.main_content, address).commit();
                break;
            case R.id.rbFind:
                find = new FragmentFind();
                getSupportFragmentManager().beginTransaction().replace(R.id.main_content, find)
                        .commit();
                break;
            case R.id.rbMe:
                me = new FragmentMe();
                getSupportFragmentManager().beginTransaction().replace(R.id.main_content, me)
                        .commit();
                break;
            default:
                break;
            }
 
        }
    });

 FragmentChat中的代码,其余的三个FragmentAddress,FragmentFind,FragmentMe类似,就不贴代码了,主要是继承Fragment 即可:

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public class FragmentChat extends Fragment {
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
    }
 
    @Override
    public View onCreateView(LayoutInflater inflater,
            @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.chat, null);
    }
 
}

  最后看张通讯录的截图吧:

、-

如果有需要,推荐之后,评论区留下邮箱,一天之内会处理~

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