【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);
     }

 }