ViewPager + Fragment 实现主界面底部导航栏

1. 四个类似的Frament布局

tab_main_fragment.xml

<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="wrap_content"
        android:layout_height="wrap_content"
        android:text="main"
        android:textSize="40sp"/>
</LinearLayout>

2.四个类似的Frament类

MainFragment

package com.example.zps.xuxian2.tab;

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

import com.example.zps.xuxian2.R;

/**
 * Created by zps on 2015/9/8.
 */
public class MainFragment extends Fragment{
//注意 Fragment 包是V4包

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.tab_main_fragment,container,false);
    }
}

3. viewpager 整体界面布局

tab_main_viewpager.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">

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

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

</LinearLayout>

4. 底部的标签兰布局   (插入到3的布局中)

tab_buttom.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="horizontal">

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

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

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

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

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

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

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

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

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

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

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

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

5 . 适配器FragmentPagerAdapter(用于2的适配器)

package com.example.zps.xuxian2.tab;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import java.util.List;

/**
 * Created by zps on 2015/9/8.
 */
public class TabFragmentPagerAdapter extends FragmentPagerAdapter{
  //继承FragmentPagerAdapter类 ,并自定义的构造器
  private List<Fragment> fragments;
    public TabFragmentPagerAdapter(FragmentManager fm,List<Fragment> fragments) {
        super(fm);
        this.fragments =fragments;
    }

    @Override
    public Fragment getItem(int position) {

        return fragments.get(position);

    }

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

6.总的活动类,实现滑动界面和点击Tab图标改变界面

TabMainActivity

package com.example.zps.xuxian2.tab;

import android.app.Activity;
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.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.example.zps.xuxian2.R;

import java.nio.IntBuffer;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by zps on 2015/9/8.
 */
public class TabMainActivity extends FragmentActivity implements View.OnClickListener {//注意是继承FragmentActivity!!我找了半天的错误

    private LinearLayout mTabMain;
    private LinearLayout mTabCommunity;
    private LinearLayout mTabShopping;
    private LinearLayout mTabMe;
    private ImageButton mImageTabMain;
    private ImageButton mImageTabCommunity;
    private ImageButton mImageTabShopping;
    private ImageButton mImageTabMe;

    private ViewPager mViewPager;
    private TabFragmentPagerAdapter mAdapter;
    private List<Fragment> mFragments;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.tab_main_viewpager);
        initView();
        initClickListener();
    }

    private void initView() {

        mViewPager = (ViewPager) findViewById(R.id.tab_main_viewpager);
        mTabMain = (LinearLayout) findViewById(R.id.id_tab_main);
        mTabCommunity = (LinearLayout) findViewById(R.id.id_tab_community);
        mTabShopping = (LinearLayout) findViewById(R.id.id_tab_shopping);
        mTabMe = (LinearLayout) findViewById(R.id.id_tab_me);
        mImageTabMain = (ImageButton) findViewById(R.id.tab_main_icon_grey);
        mImageTabCommunity = (ImageButton) findViewById(R.id.tab_community_icon_grey);
        mImageTabShopping = (ImageButton) findViewById(R.id.tab_shopping_cart_icon_grey);
        mImageTabMe = (ImageButton) findViewById(R.id.tab_me_icon_grey);

        mFragments = new ArrayList<Fragment>();
        Fragment mTab_01 = new MainFragment();
        Fragment mTab_02 = new CommunityFragment();
        Fragment mTab_03 = new ShoppingFragment();
        Fragment mTab_04 = new MeFragment();
        mFragments.add(mTab_01);
        mFragments.add(mTab_02);
        mFragments.add(mTab_03);
        mFragments.add(mTab_04);

        mAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager(), mFragments);
        mViewPager.setAdapter(mAdapter);
//设置滑动监听器
        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }
//滑动时 改变图标状态
            @Override
            public void onPageSelected(int position) {
                int currentItem = mViewPager.getCurrentItem();
                initTabImage();
                switch (currentItem) {
                    case 0:
                        mImageTabMain.setImageResource(R.drawable.tab_main_icon_green);
                        break;
                    case 1:
                        mImageTabCommunity.setImageResource(R.drawable.tab_community_icon_green);
                        break;
                    case 2:
                        mImageTabShopping.setImageResource(R.drawable.tab_shopping_cart_icon_green);
                        break;
                    case 3:
                        mImageTabMe.setImageResource(R.drawable.tab_me_icon_green);
                        break;

                }
            }
            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

    }
//初始的图标状态(滑动和点击事件改变的时候都要初始化)
    private void initTabImage() {
        mImageTabMain.setImageResource(R.drawable.tab_main_icon_grey);
        mImageTabCommunity.setImageResource(R.drawable.tab_community_icon_grey);
        mImageTabShopping.setImageResource(R.drawable.tab_shopping_cart_icon_grey);
        mImageTabMe.setImageResource(R.drawable.tab_me_icon_grey);
    }

//设置图标点击监听器
    private void initClickListener() {
        mTabMain.setOnClickListener(this);
        mTabCommunity.setOnClickListener(this);
        mTabShopping.setOnClickListener(this);
        mTabMe.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.id_tab_main:
                // initTabImage();
                //mImageTabMain.setImageResource(R.drawable.tab_main_icon_green);
                //注意上面修改的只是图标的状态,还要修改相对应的fragment;
                setSelect(0);
                break;
            case R.id.id_tab_community:
                setSelect(1);
                break;
            case R.id.id_tab_shopping:
                setSelect(2);
                break;
            case R.id.id_tab_me:
                setSelect(3);
                break;
        }
    }

//设置将点击的那个图标为亮色,切换内容区域
    private void setSelect(int i) {

        initTabImage();
        switch (i) {
            case 0:
                mImageTabMain.setImageResource(R.drawable.tab_main_icon_green);
                break;
            case 1:
                mImageTabCommunity.setImageResource(R.drawable.tab_community_icon_green);
                break;
            case 2:
                mImageTabShopping.setImageResource(R.drawable.tab_shopping_cart_icon_green);
                break;
            case 3:
                mImageTabMe.setImageResource(R.drawable.tab_me_icon_green);
                break;
            default:
                break;
        }
        mViewPager.setCurrentItem(i);
    }
}