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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=http://www.mamicode.com/"@drawable/tab_weixin_pressed" />>
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
几种Tab的实现方法
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