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属性添加

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，其他类似

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;
}
}

/**
* 将所有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);
}

}

不懂得可以看一下我之前写的ViewPager的文章，那个比较详细

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

但是第这种方法有很大缺点：

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

第二种实现方法

使用Fragment

实现思路：上面top标题。下面四个按钮，中间采用Fragment进行界面切换

参看我的博客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

这种方法实现的只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需要注意，导入的包一定要一致，mainActivity.中导入的Fragment与Fragment界面导入的Fragment要一致如下，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

其实这种实现方式和第一种PageAdapter实现方式很类似，

第一种实现方式PagerAdapter,每个界面放的是一个View

private List<View> mViews = new ArrayList<View>();
而FragmentPagerAdapter实现每个界面放的是一个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可以实现滑动，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

这里暂时不写了，以后有机会再补充