android ViewPager和FragmentPagerAdapter结合使用

package com.example.mainframework03;

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.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends FragmentActivity {

private ViewPager mViewPager;
private FragmentPagerAdapter mAdapter;
private List<Fragment> mFragments = new ArrayList<Fragment>();

/**
* 底部四个按钮
*/
private LinearLayout mTabBtnWeixin;
private LinearLayout mTabBtnFrd;
private LinearLayout mTabBtnAddress;
private LinearLayout mTabBtnSettings;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
// 初始化底部按钮 并构造Fragment集合
initView();
// 初始化FragmentPagerAdapter
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() {

private int currentIndex;

@Override
public void onPageSelected(int position) {
// 重置底部按钮状态
resetTabBtn();
// 设置对应按钮为按着状态
switch (position) {
case 0:
((ImageButton) mTabBtnWeixin
.findViewById(R.id.btn_tab_bottom_weixin))
.setImageResource(R.drawable.tab_weixin_pressed);
break;
case 1:
((ImageButton) mTabBtnFrd
.findViewById(R.id.btn_tab_bottom_friend))
.setImageResource(R.drawable.tab_find_frd_pressed);
break;
case 2:
((ImageButton) mTabBtnAddress
.findViewById(R.id.btn_tab_bottom_contact))
.setImageResource(R.drawable.tab_address_pressed);
break;
case 3:
((ImageButton) mTabBtnSettings
.findViewById(R.id.btn_tab_bottom_setting))
.setImageResource(R.drawable.tab_settings_pressed);
break;
}
currentIndex = position;
}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}

@Override
public void onPageScrollStateChanged(int arg0) {
}
});

}

protected void resetTabBtn() {
((ImageButton) mTabBtnWeixin.findViewById(R.id.btn_tab_bottom_weixin))
.setImageResource(R.drawable.tab_weixin_normal);
((ImageButton) mTabBtnFrd.findViewById(R.id.btn_tab_bottom_friend))
.setImageResource(R.drawable.tab_find_frd_normal);
((ImageButton) mTabBtnAddress.findViewById(R.id.btn_tab_bottom_contact))
.setImageResource(R.drawable.tab_address_normal);
((ImageButton) mTabBtnSettings
.findViewById(R.id.btn_tab_bottom_setting))
.setImageResource(R.drawable.tab_settings_normal);
}

private void initView() {

mTabBtnWeixin = (LinearLayout) findViewById(R.id.id_tab_bottom_weixin);
mTabBtnFrd = (LinearLayout) findViewById(R.id.id_tab_bottom_friend);
mTabBtnAddress = (LinearLayout) findViewById(R.id.id_tab_bottom_contact);
mTabBtnSettings = (LinearLayout) findViewById(R.id.id_tab_bottom_setting);

MainTab01 tab01 = new MainTab01();
MainTab02 tab02 = new MainTab02();
MainTab03 tab03 = new MainTab03();
MainTab04 tab04 = new MainTab04();
mFragments.add(tab01);
mFragments.add(tab02);
mFragments.add(tab03);
mFragments.add(tab04);
}
}