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);
}
}