Android实战简易教程-第三十四枪（基于ViewPager和FragmentPagerAdapter实现滑动通用Tab）

上一段时间写过一篇文章《基于ViewPager实现微信页面切换效果》
里面实现了相似微信Tab的页面。可是这样的实现方法有个问题。就是以后全部的代码逻辑都必须在MainActivity中实现。这样就造成MainActivity文件很臃肿，不利于代码管理。
以下我们基于ViewPager和FragmentPagerAdapter实现滑动通用Tab。

布局文件基本和上篇文章一致。

1.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="#ffffff"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="寻 领"
        android:textColor="#000000"
        android:textSize="20sp"
        android:textStyle="bold" />

</LinearLayout>

2.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="#ffffff"
    android:orientation="horizontal" >

    <LinearLayout
        android:id="@+id/id_tab_lost"
        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_lost_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00000000"
            android:clickable="false"
            android:src="@drawable/lost" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="寻物"
            android:textColor="#000000" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/id_tab_found"
        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_found_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00000000"
            android:clickable="false"
            android:src="@drawable/found" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="认领"
            android:textColor="#000000" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/id_tab_publish"
        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_publish_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="公布"
            android:textColor="#000000" />
    </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="#000000" />
    </LinearLayout>

</LinearLayout>

3.main.xml:

<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>

4.tab01.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 Lost Tab"
        android:textSize="30sp"
        android:textStyle="bold" />

</LinearLayout>

tab02.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 Found Tab"
        android:textSize="30sp"
        android:textStyle="bold" />

</LinearLayout>

tab03.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 Publish Tab"
        android:textSize="30sp"
        android:textStyle="bold" />

</LinearLayout>

tab04.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 Settings Tab"
        android:textSize="30sp"
        android:textStyle="bold" />

</LinearLayout>

5.MainActivity.java:

package com.lostandfound.activity;

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 mTabLost;
    private LinearLayout mTabFound;
    private LinearLayout mTabPublish;
    private LinearLayout mTabSettings;

    private ImageButton mImgLost;
    private ImageButton mImgFound;
    private ImageButton mImgPublish;
    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()
    {
        mTabLost.setOnClickListener(this);
        mTabFound.setOnClickListener(this);
        mTabPublish.setOnClickListener(this);
        mTabSettings.setOnClickListener(this);
    }

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

        mTabLost = (LinearLayout) findViewById(R.id.id_tab_lost);
        mTabFound = (LinearLayout) findViewById(R.id.id_tab_found);
        mTabPublish = (LinearLayout) findViewById(R.id.id_tab_publish);
        mTabSettings = (LinearLayout) findViewById(R.id.id_tab_settings);

        mImgLost = (ImageButton) findViewById(R.id.id_tab_lost_img);
        mImgFound = (ImageButton) findViewById(R.id.id_tab_found_img);
        mImgPublish = (ImageButton) findViewById(R.id.id_tab_publish_img);
        mImgSettings = (ImageButton) findViewById(R.id.id_tab_settings_img);

        mFragments = new ArrayList<Fragment>();
        Fragment mTab01 = new LostFragment();
        Fragment mTab02 = new FoundFragment();
        Fragment mTab03 = new PublishFragment();
        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_lost:
            setSelect(0);
            break;
        case R.id.id_tab_found:
            setSelect(1);
            break;
        case R.id.id_tab_publish:
            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:
            mImgLost.setImageResource(R.drawable.lost);
            break;
        case 1:
            mImgFound.setImageResource(R.drawable.found);
            break;
        case 2:
            mImgPublish.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()
    {
        mImgLost.setImageResource(R.drawable.lost);
        mImgFound.setImageResource(R.drawable.found);
        mImgPublish.setImageResource(R.drawable.tab_address_normal);
        mImgSettings.setImageResource(R.drawable.tab_settings_normal);
    }

}

6.四个Fragment
LostFragment.java:

package com.lostandfound.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class LostFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.tab01, container, false);
    }
}

FoundFragment.java:

package com.lostandfound.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FoundFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.tab02, container, false);
    }
}

PublishFragment.java:

package com.lostandfound.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class PublishFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.tab03, container, false);
    }
}

SettingFragment.java:

package com.lostandfound.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class SettingFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.tab04, container, false);
    }
}

最后执行实例：

能够实现ViewPager似的滑动翻页，同一时候还能够分开编码。

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