【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);
    }

}