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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | <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:
1 2 3 4 5 6 7 8 | <?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:
1 2 3 4 5 6 7 8 | <?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:
1 2 3 4 5 6 | <?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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <?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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | 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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 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:
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