【IMOOC学习笔记】多种多样的App主界面Tab实现方法(三)

FragmentPagerAdapter+ViewPager

与之前直接用ViewPager不同的是，数组里面放的不再是View,而是Fraagment;

使用FragmentPagerAdapter

xml文件没有变化，只有代码发生变化

 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();

         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;

         }

     }

     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);

     }

 }