几种Tab的实现方法

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学了这久Android，今天来总结一下几种Tab的实现方法

实现方法一：

ViewPage来实现

首先创建一个top.xml布局和一个bottom.xml布局，然后在主界面中通过Include属性加入

top.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="45dp"
    android:background="@drawable/title_bar"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="微信"
        android:textColor="#ffffff"
        android:textSize="20sp"
        android:textStyle="bold" />

</LinearLayout>

bottom.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="55dp"
    android:background="@drawable/bottom_bar"
    android:orientation="horizontal" >

    <LinearLayout
        android:id="@+id/id_tab_weixin"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <ImageButton
            android:id="@+id/id_tab_weixin_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00000000"
            android:clickable="false"
            android:src="@drawable/tab_weixin_pressed" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="微信"
            android:textColor="#ffffff" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/id_tab_frd"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <ImageButton
            android:id="@+id/id_tab_frd_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00000000"
            android:clickable="false"
            android:src="@drawable/tab_find_frd_normal" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="朋友"
            android:textColor="#ffffff" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/id_tab_address"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <ImageButton
            android:id="@+id/id_tab_address_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00000000"
            android:clickable="false"
            android:src="@drawable/tab_address_normal" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="通讯录"
            android:textColor="#ffffff" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/id_tab_settings"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <ImageButton
            android:id="@+id/id_tab_settings_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00000000"
            android:clickable="false"
            android:src="@drawable/tab_settings_normal" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="设置"
            android:textColor="#ffffff" />
    </LinearLayout>

</LinearLayout>

main.xml,通过include引入，中间使用ViewPager

<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/top" />

    <android.support.v4.view.ViewPager
        android:id="@+id/id_viewpager"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >
    </android.support.v4.view.ViewPager>

    <include layout="@layout/bottom" />

</LinearLayout>

然后写几个界面的布局：用于切换的时候显示。这里我就写一个，其它类似

tob01.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="match_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:text="This is Weixin Tab"
        android:textSize="30sp"
        android:textStyle="bold" />

</LinearLayout>

MainActivity.java

package com.imooc.tab01;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnClickListener
{

	private ViewPager mViewPager;
	private PagerAdapter mAdapter;
	private List<View> mViews = new ArrayList<View>();
	// TAB

	private LinearLayout mTabWeixin;
	private LinearLayout mTabFrd;
	private LinearLayout mTabAddress;
	private LinearLayout mTabSetting;

	private ImageButton mWeixinImg;
	private ImageButton mFrdImg;
	private ImageButton mAddressImg;
	private ImageButton mSettingImg;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);

		initView();

		initEvents();

	}

	private void initEvents()
	{
		mTabWeixin.setOnClickListener(this);
		mTabFrd.setOnClickListener(this);
		mTabAddress.setOnClickListener(this);
		mTabSetting.setOnClickListener(this);

		mViewPager.setOnPageChangeListener(new OnPageChangeListener()
		{

			@Override
			public void onPageSelected(int arg0)
			{
				int currentItem = mViewPager.getCurrentItem();
				resetImg();
				switch (currentItem)
				{
				case 0:
					mWeixinImg.setImageResource(R.drawable.tab_weixin_pressed);
					break;
				case 1:
					mFrdImg.setImageResource(R.drawable.tab_find_frd_pressed);
					break;
				case 2:
					mAddressImg.setImageResource(R.drawable.tab_address_pressed);
					break;
				case 3:
					mSettingImg.setImageResource(R.drawable.tab_settings_pressed);
					break;

				}

			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2)
			{

			}

			@Override
			public void onPageScrollStateChanged(int arg0)
			{

			}
		});
	}

	private void initView()
	{
		mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
		// tabs
		mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
		mTabFrd = (LinearLayout) findViewById(R.id.id_tab_frd);
		mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
		mTabSetting = (LinearLayout) findViewById(R.id.id_tab_settings);
		// ImageButton
		mWeixinImg = (ImageButton) findViewById(R.id.id_tab_weixin_img);
		mFrdImg = (ImageButton) findViewById(R.id.id_tab_frd_img);
		mAddressImg = (ImageButton) findViewById(R.id.id_tab_address_img);
		mSettingImg = (ImageButton) findViewById(R.id.id_tab_settings_img);

		LayoutInflater mInflater = LayoutInflater.from(this);
		View tab01 = mInflater.inflate(R.layout.tab01, null);
		View tab02 = mInflater.inflate(R.layout.tab02, null);
		View tab03 = mInflater.inflate(R.layout.tab03, null);
		View tab04 = mInflater.inflate(R.layout.tab04, null);
		mViews.add(tab01);
		mViews.add(tab02);
		mViews.add(tab03);
		mViews.add(tab04);

		mAdapter = new PagerAdapter()
		{

			@Override
			public void destroyItem(ViewGroup container, int position,
					Object object)
			{
				container.removeView(mViews.get(position));
			}

			@Override
			public Object instantiateItem(ViewGroup container, int position)
			{
				View view = mViews.get(position);
				container.addView(view);
				return view;
			}

			@Override
			public boolean isViewFromObject(View arg0, Object arg1)
			{
				return arg0 == arg1;
			}

			@Override
			public int getCount()
			{
				return mViews.size();
			}
		};

		mViewPager.setAdapter(mAdapter);

	}

	@Override
	public void onClick(View v)
	{
		resetImg();
		switch (v.getId())
		{
		case R.id.id_tab_weixin:
			mViewPager.setCurrentItem(0);
			mWeixinImg.setImageResource(R.drawable.tab_weixin_pressed);
			break;
		case R.id.id_tab_frd:
			mViewPager.setCurrentItem(1);
			mFrdImg.setImageResource(R.drawable.tab_find_frd_pressed);
			break;
		case R.id.id_tab_address:
			mViewPager.setCurrentItem(2);
			mAddressImg.setImageResource(R.drawable.tab_address_pressed);
			break;
		case R.id.id_tab_settings:
			mViewPager.setCurrentItem(3);
			mSettingImg.setImageResource(R.drawable.tab_settings_pressed);
			break;

		default:
			break;
		}
	}

	/**
	 * 将全部的图片切换为暗色的
	 */
	private void resetImg()
	{
		mWeixinImg.setImageResource(R.drawable.tab_weixin_normal);
		mFrdImg.setImageResource(R.drawable.tab_find_frd_normal);
		mAddressImg.setImageResource(R.drawable.tab_address_normal);
		mSettingImg.setImageResource(R.drawable.tab_settings_normal);
	}

}

不懂得能够看一下我之前写的ViewPager的文章。那个比較具体

ViewPager第一个课：http://blog.csdn.net/wei_chong_chong/article/details/50468832

第二课：http://blog.csdn.net/wei_chong_chong/article/details/50488328

可是第这样的方法有非常大缺点：

四个界面的代码都会集中在MainActivity中，显得mainActivity和冗长不宜于代码的改善后期的维护

另外一种实现方法

使用Fragment

实现思路：上面top标题。以下四个button，中间採用Fragment进行界面切换

參看我的博客Fragment基础：http://blog.csdn.net/wei_chong_chong/article/details/50935411

Fragment页面切换案例：http://blog.csdn.net/wei_chong_chong/article/details/50766663

这样的方法实现的仅仅能通过点击切换不同的界面，不能通过滑动切换界面

关键代码：使用Fragment须要注意，导入的包一定要一致。mainActivity.中导入的Fragment与Fragment界面导入的Fragment要一致例如以下，一定要是同一个包下的Fragment

import android.support.v4.app.Fragment;

package com.imooc.tab02;

import android.os.Bundle;
import android.support.v4.app.Fragment;
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.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends FragmentActivity implements OnClickListener
{
	private LinearLayout mTabWeixin;
	private LinearLayout mTabFrd;
	private LinearLayout mTabAddress;
	private LinearLayout mTabSettings;

	private ImageButton mImgWeixin;
	private ImageButton mImgFrd;
	private ImageButton mImgAddress;
	private ImageButton mImgSettings;

	private Fragment mTab01;
	private Fragment mTab02;
	private Fragment mTab03;
	private Fragment mTab04;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		initView();
		initEvent();
		setSelect(0);
	}

	private void initEvent()
	{
		mTabWeixin.setOnClickListener(this);
		mTabFrd.setOnClickListener(this);
		mTabAddress.setOnClickListener(this);
		mTabSettings.setOnClickListener(this);
	}

	private void initView()
	{
		mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
		mTabFrd = (LinearLayout) findViewById(R.id.id_tab_frd);
		mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
		mTabSettings = (LinearLayout) findViewById(R.id.id_tab_settings);

		mImgWeixin = (ImageButton) findViewById(R.id.id_tab_weixin_img);
		mImgFrd = (ImageButton) findViewById(R.id.id_tab_frd_img);
		mImgAddress = (ImageButton) findViewById(R.id.id_tab_address_img);
		mImgSettings = (ImageButton) findViewById(R.id.id_tab_settings_img);
	}

	private void setSelect(int i)
	{
		FragmentManager fm = getSupportFragmentManager();
		FragmentTransaction transaction = fm.beginTransaction();
		hideFragment(transaction);
		// 把图片设置为亮的
		// 设置内容区域
		switch (i)
		{
		case 0:
			if (mTab01 == null)
			{
				mTab01 = new WeixinFragment();
				transaction.add(R.id.id_content, mTab01);
			} else
			{
				transaction.show(mTab01);
			}
			mImgWeixin.setImageResource(R.drawable.tab_weixin_pressed);
			break;
		case 1:
			if (mTab02 == null)
			{
				mTab02 = new FrdFragment();transaction.add(R.id.id_content, mTab02);
			} else
			{
				transaction.show(mTab02);
				
			}
			mImgFrd.setImageResource(R.drawable.tab_find_frd_pressed);
			break;
		case 2:
			if (mTab03 == null)
			{
				mTab03 = new AddressFragment();
				transaction.add(R.id.id_content, mTab03);
			} else
			{
				transaction.show(mTab03);
			}
			mImgAddress.setImageResource(R.drawable.tab_address_pressed);
			break;
		case 3:
			if (mTab04 == null)
			{
				mTab04 = new SettingFragment();
				transaction.add(R.id.id_content, mTab04);
			} else
			{
				transaction.show(mTab04);
			}
			mImgSettings.setImageResource(R.drawable.tab_settings_pressed);
			break;

		default:
			break;
		}

		transaction.commit();
	}

	private void hideFragment(FragmentTransaction transaction)
	{
		if (mTab01 != null)
		{
			transaction.hide(mTab01);
		}
		if (mTab02 != null)
		{
			transaction.hide(mTab02);
		}
		if (mTab03 != null)
		{
			transaction.hide(mTab03);
		}
		if (mTab04 != null)
		{
			transaction.hide(mTab04);
		}
	}

	@Override
	public void onClick(View v)
	{
		resetImgs();
		switch (v.getId())
		{
		case R.id.id_tab_weixin:
			setSelect(0);
			break;
		case R.id.id_tab_frd:
			setSelect(1);
			break;
		case R.id.id_tab_address:
			setSelect(2);
			break;
		case R.id.id_tab_settings:
			setSelect(3);
			break;

		default:
			break;
		}
	}

	/**
	 * 切换图片至暗色
	 */
	private void resetImgs()
	{
		mImgWeixin.setImageResource(R.drawable.tab_weixin_normal);
		mImgFrd.setImageResource(R.drawable.tab_find_frd_normal);
		mImgAddress.setImageResource(R.drawable.tab_address_normal);
		mImgSettings.setImageResource(R.drawable.tab_settings_normal);
	}

}

主界面

<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/top" />

	<FrameLayout 
	    android:id="@+id/id_content"
	    android:layout_width="fill_parent"
	    android:layout_height="0dp"
	    android:layout_weight="1"
	    ></FrameLayout>

    <include layout="@layout/bottom" />

</LinearLayout>

第三种实现方法

ViewPager+FragmentPagerAdapter

事实上这样的实现方式和第一种PageAdapter实现方式非常类似。

第一种实现方式PagerAdapter,每一个界面放的是一个View

private List<View> mViews = new ArrayList<View>();

而FragmentPagerAdapter实现每一个界面放的是一个Fragment界面

private List<Fragment> mFragments;

Fragment作为内容布局优势：实现代码的分离。易于代码的维护

ViewPager能够实现滑动，两者结合就是FragmentPagerAdapter

package com.imooc.tab03;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends FragmentActivity implements OnClickListener
{
	private ViewPager mViewPager;
	private FragmentPagerAdapter mAdapter;
	private List<Fragment> mFragments;

	private LinearLayout mTabWeixin;
	private LinearLayout mTabFrd;
	private LinearLayout mTabAddress;
	private LinearLayout mTabSettings;

	private ImageButton mImgWeixin;
	private ImageButton mImgFrd;
	private ImageButton mImgAddress;
	private ImageButton mImgSettings;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);

		initView();
		initEvent();
		
		setSelect(1);
	}

	private void initEvent()
	{
		mTabWeixin.setOnClickListener(this);
		mTabFrd.setOnClickListener(this);
		mTabAddress.setOnClickListener(this);
		mTabSettings.setOnClickListener(this);
	}

	private void initView()
	{
		mViewPager = (ViewPager) findViewById(R.id.id_viewpager);

		mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
		mTabFrd = (LinearLayout) findViewById(R.id.id_tab_frd);
		mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
		mTabSettings = (LinearLayout) findViewById(R.id.id_tab_settings);

		mImgWeixin = (ImageButton) findViewById(R.id.id_tab_weixin_img);
		mImgFrd = (ImageButton) findViewById(R.id.id_tab_frd_img);
		mImgAddress = (ImageButton) findViewById(R.id.id_tab_address_img);
		mImgSettings = (ImageButton) findViewById(R.id.id_tab_settings_img);

		mFragments = new ArrayList<Fragment>();
		Fragment mTab01 = new WeixinFragment();
		Fragment mTab02 = new FrdFragment();
		Fragment mTab03 = new AddressFragment();
		Fragment mTab04 = new SettingFragment();
		mFragments.add(mTab01);
		mFragments.add(mTab02);
		mFragments.add(mTab03);
		mFragments.add(mTab04);

		mAdapter = new FragmentPagerAdapter(getSupportFragmentManager())
		{

			@Override
			public int getCount()
			{
				return mFragments.size();
			}

			@Override
			public Fragment getItem(int arg0)
			{
				return mFragments.get(arg0);
			}
		};
		mViewPager.setAdapter(mAdapter);
		
		mViewPager.setOnPageChangeListener(new OnPageChangeListener()
		{
			
			@Override
			public void onPageSelected(int arg0)
			{
				int currentItem = mViewPager.getCurrentItem();
				setTab(currentItem);
			}
			
			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2)
			{
				// TODO Auto-generated method stub
				
			}
			
			@Override
			public void onPageScrollStateChanged(int arg0)
			{
				// TODO Auto-generated method stub
				
			}
		});
	}

	@Override
	public void onClick(View v)
	{
		switch (v.getId())
		{
		case R.id.id_tab_weixin:
			setSelect(0);
			break;
		case R.id.id_tab_frd:
			setSelect(1);
			break;
		case R.id.id_tab_address:
			setSelect(2);
			break;
		case R.id.id_tab_settings:
			setSelect(3);
			break;

		default:
			break;
		}
	}

	private void setSelect(int i)
	{
		setTab(i);
		mViewPager.setCurrentItem(i);
	}

	private void setTab(int i)
	{
		resetImgs();
		// 设置图片为亮色
		// 切换内容区域
		switch (i)
		{
		case 0:
			mImgWeixin.setImageResource(R.drawable.tab_weixin_pressed);
			break;
		case 1:
			mImgFrd.setImageResource(R.drawable.tab_find_frd_pressed);
			break;
		case 2:
			mImgAddress.setImageResource(R.drawable.tab_address_pressed);
			break;
		case 3:
			mImgSettings.setImageResource(R.drawable.tab_settings_pressed);
			break;
		}
	}

	/**
	 * 切换图片至暗色
	 */
	private void resetImgs()
	{
		mImgWeixin.setImageResource(R.drawable.tab_weixin_normal);
		mImgFrd.setImageResource(R.drawable.tab_find_frd_normal);
		mImgAddress.setImageResource(R.drawable.tab_address_normal);
		mImgSettings.setImageResource(R.drawable.tab_settings_normal);
	}

}

第四种实现方式：

使用第三方的ViewPagerIndicator实现指示器+Viewpager FragmentAdapter

这里临时不写了，以后有机会再补充