Android Tab切换之Fragment方法

纵观现在大部分Android客户端界面框架基本都是TitleBar+内容区域+TabBar的模式。其中TabBar用来切换对应的内容区域。

今天我们用Fragment的方式实现Tab的切换

不多说~上图：

点击底部的Tab，中间的Fragment内容区域就会相应的切换。

这里的Fragment只是简单的显示一个TextView。

Title的布局title_ui.xml：

<?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="wrap_content"    android:orientation="vertical"    android:background="@android:color/holo_orange_dark" >        <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="客户端"        android:textSize="20sp"        android:textStyle="bold"        android:textColor="@android:color/holo_blue_dark"/></LinearLayout>

Tab的布局tab_ui.xml：

<?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="wrap_content"    android:background="@android:color/holo_blue_dark"    android:orientation="horizontal" >    <LinearLayout        android:id="@+id/tab01"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:orientation="vertical" >        <ImageView            android:id="@+id/tabImage01"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@drawable/tab_weixin_normal" />        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="center"            android:text="微信"            android:textColor="@android:color/black" />    </LinearLayout>    <LinearLayout        android:id="@+id/tab02"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:orientation="vertical" >        <ImageView            android:id="@+id/tabImage02"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@drawable/tab_address_normal" />        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="center"            android:text="地址"            android:textColor="@android:color/black" />    </LinearLayout>    <LinearLayout        android:id="@+id/tab03"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:orientation="vertical" >        <ImageView            android:id="@+id/tabImage03"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@drawable/tab_settings_normal" />        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="center"            android:text="设置"            android:textColor="@android:color/black" />    </LinearLayout>    <LinearLayout        android:id="@+id/tab04"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:orientation="vertical" >        <ImageView            android:id="@+id/tabImage04"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@drawable/tab_find_frd_normal" />        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="center"            android:text="朋友"            android:textColor="@android:color/black" />    </LinearLayout></LinearLayout>

主界面布局：

<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/title_ui"/>        <LinearLayout        android:id="@+id/fragment_ui"         android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:orientation="horizontal"        ></LinearLayout>        <include layout="@layout/tab_ui"/></LinearLayout>

Fragment代码（其中之一，其他都一样）：

package com.example.tabfragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class FragmenAddr extends Fragment {@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragment_addrs, container, false);return view;}}

主Activity代码：

package com.example.tabfragment;import android.os.Bundle;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.ImageView;import android.widget.LinearLayout;public class MainActivity extends FragmentActivity implements OnClickListener {private LinearLayout layoutTab01;//Tab四个按钮之一private LinearLayout layoutTab02;private LinearLayout layoutTab03;private LinearLayout layoutTab04;private ImageView imageView01;//Tab图片private ImageView imageView02;private ImageView imageView03;private ImageView imageView04;private FragmentManager manager;private FragmentTransaction transaction;private FragmenWeixin weixin;//内容区域private FragmenAddr addr;private FragmenSetting setting;private FragmenFriend friend;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initView();initEvent();setSelect(0);}private void setSelect(int i) {clearImageView();manager = getSupportFragmentManager();transaction = manager.beginTransaction();hideFragment(transaction);switch (i) {case 0:imageView01.setImageResource(R.drawable.tab_weixin_pressed);if(weixin == null){weixin = new FragmenWeixin();transaction.add(R.id.fragment_ui,weixin);}else {transaction.show(weixin);}break;case 1:imageView02.setImageResource(R.drawable.tab_address_pressed);if(addr == null){addr = new FragmenAddr();transaction.add(R.id.fragment_ui,addr);}else {transaction.show(addr);}break;case 2:imageView03.setImageResource(R.drawable.tab_settings_pressed);if(setting == null){setting = new FragmenSetting();transaction.add(R.id.fragment_ui,setting);}else {transaction.show(setting);}break;case 3:imageView04.setImageResource(R.drawable.tab_find_frd_pressed);if(friend == null){friend = new FragmenFriend();transaction.add(R.id.fragment_ui,friend);}else {transaction.show(friend);}break;default:break;}transaction.commit();}private void hideFragment(FragmentTransaction transaction2) {// TODO Auto-generated method stubif(weixin != null){transaction2.hide(weixin);}if(addr != null){transaction2.hide(addr);}if(setting != null){transaction2.hide(setting);}if(friend != null){transaction2.hide(friend);}}private void clearImageView() {imageView01.setImageResource(R.drawable.tab_weixin_normal);imageView02.setImageResource(R.drawable.tab_address_normal);imageView03.setImageResource(R.drawable.tab_settings_normal);imageView04.setImageResource(R.drawable.tab_find_frd_normal);}private void initEvent() {layoutTab01.setOnClickListener(this);layoutTab02.setOnClickListener(this);layoutTab03.setOnClickListener(this);layoutTab04.setOnClickListener(this);}private void initView() {layoutTab01 = (LinearLayout) findViewById(R.id.tab01);layoutTab02 = (LinearLayout) findViewById(R.id.tab02);layoutTab03 = (LinearLayout) findViewById(R.id.tab03);layoutTab04 = (LinearLayout) findViewById(R.id.tab04);imageView01 = (ImageView) findViewById(R.id.tabImage01);imageView02 = (ImageView) findViewById(R.id.tabImage02);imageView03 = (ImageView) findViewById(R.id.tabImage03);imageView04 = (ImageView) findViewById(R.id.tabImage04);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.tab01:setSelect(0);break;case R.id.tab02:setSelect(1);break;case R.id.tab03:setSelect(2);break;case R.id.tab04:setSelect(3);break;default:break;}}}

主要流程：点击Tab中的按钮，将该按钮的ImageView颜色变为选中状态，同时切换相应的Fragment。

此方法使用了目前较推荐的Fragment，减少了代码的耦合程度。下一篇将介绍Tab切换的另一种方法，利用ViewPager+FragmentPageAdapter的方式实现Tab的切换