详解Xamarin.Android 利用Fragment实现底部菜单

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#FFFFFF">  <TextView    android:id="@+id/txt_content"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:text="首页"    android:textColor="#000000"    android:textSize="20sp" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#FFFFFF">  <TextView    android:id="@+id/txt_content"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:text="贴签"    android:textColor="#000000"    android:textSize="20sp" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#FFFFFF">  <TextView    android:id="@+id/txt_content"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:text="我的"    android:textColor="#000000"    android:textSize="20sp" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#FFFFFF">  <TextView    android:id="@+id/txt_content"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:text="查询"    android:textColor="#000000"    android:textSize="20sp" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"  android:orientation="vertical">   <include    layout="@layout/main_left" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/dl_left"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#f0f0f0"> <!--主布局--> <LinearLayout   android:layout_width="match_parent"   android:layout_height="match_parent"   android:orientation="horizontal">   <RelativeLayout  android:layout_width="match_parent"  android:layout_height="match_parent"  android:id="@+id/relativelayout1"    android:fitsSystemWindows="true">   <RelativeLayout     android:id="@+id/ly_top_bar"     android:layout_width="match_parent"     android:layout_height="48dp"      android:visibility="gone">    </RelativeLayout>   <LinearLayout      android:id="@+id/ly_tab_bar"      android:layout_width="match_parent"      android:layout_height="50dp"      android:layout_alignParentBottom="true"       android:background="#FFFFFF"       android:orientation="vertical">    <View      android:layout_width="match_parent"      android:layout_height="2px"      android:background="#cccccc" />    <LinearLayout      android:layout_width="match_parent"      android:layout_height="40dp"      android:orientation="horizontal"      android:layout_marginTop="5dp">     <ImageView       android:id="@+id/iv_home"      android:layout_width="25.6dp"      android:layout_height="37.6dp"      android:src="@drawable/icon_home1"      android:layout_weight="1"/>     <ImageView       android:id="@+id/iv_query"      android:layout_width="25.6dp"      android:layout_height="37.6dp"      android:src="@drawable/icon_query1"      android:layout_weight="1"/>     <ImageView       android:id="@+id/iv_label"     android:layout_width="25.6dp"      android:layout_height="37.6dp"      android:src="@drawable/icon_label1"      android:layout_weight="1"/>     <ImageView       android:id="@+id/iv_mine"      android:layout_width="25.6dp"      android:layout_height="37.6dp"      android:src="@drawable/icon_mine1"      android:layout_weight="1"/>     </LinearLayout>   </LinearLayout>   <View     android:id="@+id/div_tab_bar"     android:layout_width="match_parent"     android:layout_height="2px"     android:background="#FFFFFF"     android:layout_above="@id/ly_tab_bar" />   <FrameLayout     android:layout_width="match_parent"     android:layout_height="match_parent"      android:id="@+id/fy_home"     android:layout_below="@id/ly_top_bar"     android:layout_above="@id/div_tab_bar" />   <FrameLayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:id="@+id/fy_query"      android:layout_below="@id/ly_top_bar"     android:layout_above="@id/div_tab_bar"/>   <FrameLayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:id="@+id/fy_label"      android:layout_below="@id/ly_top_bar"     android:layout_above="@id/div_tab_bar"/>   <FrameLayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:id="@+id/fy_mine"      android:layout_below="@id/ly_top_bar"     android:layout_above="@id/div_tab_bar"/>  </RelativeLayout> </LinearLayout> </android.support.v4.widget.DrawerLayout>

<?xml version="1.0" encoding="utf-8" ?><resources>    <color name="primary">#1e89e7</color> <color name="primaryDark">#1976d2</color> <color name="red">#ff0000</color> <color name="white">#ffffff</color> <style name="BaseAppTheme" parent="Theme.AppCompat.Light.DarkActionBar">  <item name="windowActionBar">false</item>  <item name="windowNoTitle">true</item>  <item name="colorPrimary">@color/primary</item>  <item name="colorPrimaryDark">@color/primaryDark</item>  <item name="drawerArrowStyle">@style/AppTheme.DrawerArrowToggle</item> </style> <style name="AppTheme.DrawerArrowToggle" parent="Base.Widget.AppCompat.DrawerArrowToggle">  <item name="color">@android:color/white</item> </style></resources>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using Android.App;using Android.Content;using Android.OS;using Android.Runtime;using Android.Util;using Android.Views;using Android.Widget;namespace BottomMuneDemo.Fragments{  public class HomeFragment : Fragment  {    private string content { get; set; }    public HomeFragment(string content)    {      this.content = content;    }    public override void OnCreate(Bundle savedInstanceState)    {      base.OnCreate(savedInstanceState);      // Create your fragment here    }    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)    {      View view = inflater.Inflate(Resource.Layout.fg_home, container, false);      TextView txt_content = (TextView)view.FindViewById(Resource.Id.txt_content);      txt_content.Text = "首页";      return view;    }  }}

using Android.App;using Android.Widget;using Android.OS;using Android.Support.V7.App;using BottomMuneDemo.Fragments;using Android.Views;namespace BottomMuneDemo{  [Activity(Label = "BottomMuneDemo", MainLauncher = true, Theme = "@style/BaseAppTheme")]  public class MainActivity : AppCompatActivity  {    private ImageView iv_home;    private ImageView iv_query;    private ImageView iv_label;    private ImageView iv_mine;    private FrameLayout fy_home;    private FrameLayout fy_query;    private FrameLayout fy_label;    private FrameLayout fy_mine;    HomeFragment fg1;    QueryFragment fg2;    LabelFragment fg3;    MineFragment fg4;    protected override void OnCreate(Bundle savedInstanceState)    {      base.OnCreate(savedInstanceState);       SetContentView(Resource.Layout.Main);      fy_home = (FrameLayout)FindViewById(Resource.Id.fy_home);      fy_query = (FrameLayout)FindViewById(Resource.Id.fy_query);      fy_label = (FrameLayout)FindViewById(Resource.Id.fy_label);      fy_mine = (FrameLayout)FindViewById(Resource.Id.fy_mine);      iv_home = (ImageView)FindViewById(Resource.Id.iv_home);      iv_query = (ImageView)FindViewById(Resource.Id.iv_query);      iv_label = (ImageView)FindViewById(Resource.Id.iv_label);      iv_mine = (ImageView)FindViewById(Resource.Id.iv_mine);      bindViews();      iv_home.PerformClick();    }    #region 底部菜单选项卡     //ui组件初始化与事件绑定    private void bindViews()    {      iv_home.Click += (s, e) => { onClick(iv_home); };      iv_query.Click += delegate { onClick(iv_query); };      iv_label.Click += delegate { onClick(iv_label); };      iv_mine.Click += delegate { onClick(iv_mine); };    }    //隐藏所有Fragment    private void hideAllFragment(FragmentTransaction fragmentTransaction)    {      if (fg1 != null) fragmentTransaction.Hide(fg1);      if (fg2 != null) fragmentTransaction.Hide(fg2);      if (fg3 != null) fragmentTransaction.Hide(fg3);      if (fg4 != null) fragmentTransaction.Hide(fg4);      iv_home.SetImageResource(Resource.Drawable.icon_home1);      iv_query.SetImageResource(Resource.Drawable.icon_query1);      iv_label.SetImageResource(Resource.Drawable.icon_label1);      iv_mine.SetImageResource(Resource.Drawable.icon_mine1);    }    //重置所有文本的选中状态    private void setSelected()    {      iv_home.Selected = false;      iv_query.Selected = false;      iv_label.Selected = false;      iv_mine.Selected = false;    }    //单击事件    public void onClick(View v)    {      FragmentTransaction fTransaction = FragmentManager.BeginTransaction();      hideAllFragment(fTransaction);      switch (v.Id)      {        case Resource.Id.iv_home:          setSelected();          iv_home.Selected = true;          iv_home.SetImageResource(Resource.Drawable.icon_home2);          if (fg1 == null)          {            fg1 = new HomeFragment("首页");            fTransaction.Add(Resource.Id.fy_home, fg1);          }          else { fTransaction.Show(fg1); }          break;        case Resource.Id.iv_query:          setSelected();          iv_query.Selected = true;          iv_query.SetImageResource(Resource.Drawable.icon_query2);          if (fg2 == null)          {            fg2 = new QueryFragment("查询");            fTransaction.Add(Resource.Id.fy_query, fg2);          }          else { fTransaction.Show(fg2); }          break;        case Resource.Id.iv_label:          setSelected();          iv_label.Selected = true;          iv_label.SetImageResource(Resource.Drawable.icon_label2);          if (fg3 == null)          {            fg3 = new LabelFragment("贴签");            fTransaction.Add(Resource.Id.fy_label, fg3);          }          else { fTransaction.Show(fg3); }          break;        case Resource.Id.iv_mine:          setSelected();          iv_mine.Selected = true;          iv_mine.SetImageResource(Resource.Drawable.icon_mine2);          if (fg4 == null)          {            fg4 = new MineFragment("我的");            fTransaction.Add(Resource.Id.fy_mine, fg4);          }          else { fTransaction.Show(fg4); }          break;      }      fTransaction.Commit();    }    #endregion   }}