ViewPager+Fragment替代TabHost效果的简单示例

本示例旨在展示fragment替代tabhost的效果，具体的业务逻辑还要根据这个示例进行扩展。

效果图如下：

主Activity代码：

package com.llb.view;

import java.util.ArrayList;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.RadioButton;
import com.llb.adapter.MyViewPagerAdapter;
import com.llb.fragment.ActivityFragment;
import com.llb.fragment.FriendFragment;
import com.llb.fragment.JobFragment;

public class MainActivity extends FragmentActivity implements OnPageChangeListener {
private ViewPager pager;
private PagerAdapter mAdapter;

private ArrayList<Fragment> fragments;
private ArrayList<RadioButton> title = new ArrayList<RadioButton>();// 三个标题

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);// /slidingmenu里面重写了
initView();// 初始化控件
initTitle();
initViewPager();
}

/**
* 初始化视图
*/
private void initView() {
pager = (ViewPager) findViewById(R.id.pager);// 初始化控件
fragments = new ArrayList<Fragment>();// 初始化数据
fragments.add(new ActivityFragment());
fragments.add(new JobFragment());
fragments.add(new FriendFragment());
}

/**
* 初始化ViewPager
*/
private void initViewPager() {
mAdapter = new MyViewPagerAdapter(getSupportFragmentManager(), fragments);
pager.setAdapter(mAdapter);
pager.setOnPageChangeListener(this);
pager.setCurrentItem(0);// 设置成当前第一个
}

/**
* 初始化几个用来显示title的RadioButton
*/
private void initTitle() {
title.add((RadioButton) findViewById(R.id.title1));// 三个title标签
title.add((RadioButton) findViewById(R.id.title2));
title.add((RadioButton) findViewById(R.id.title3));
title.get(0).setOnClickListener(new MyOnClickListener(0));// 设置响应
title.get(1).setOnClickListener(new MyOnClickListener(1));
title.get(2).setOnClickListener(new MyOnClickListener(2));
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

/**
* 重写OnClickListener的响应函数，主要目的就是实现点击title时，pager会跟着响应切换
*
* @author llb
*
*/
private class MyOnClickListener implements OnClickListener {
private int index;

public MyOnClickListener(int index) {
this.index = index;
}

@Override
public void onClick(View v) {
pager.setCurrentItem(index);// 把viewpager的视图切过去，实现捏造title跟pager的联动
title.get(index).setChecked(true);// 设置被选中，否则布局里面的背景不会切换
}

}

/**
* 下面三个是OnPageChangeListener的接口函数
*/
@Override
public void onPageScrollStateChanged(int arg0) {
}

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

@Override
public void onPageSelected(int arg0) {
Log.i("slide", "onPageSelected+agr0=" + arg0);
title.get(arg0).setChecked(true);// 保持页面跟按钮的联动
}
}

Fragment 页面 ，贴一个的代码，其他2个与此类似

package com.llb.fragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.llb.view.R;

public class ActivityFragment extends Fragment {
private View view;// 缓存页面

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i("slide", "ActivityFragment--onCreate");
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.i("slide", "ActivityFragment-onCreateView");
if (view == null) {
view = inflater.inflate(R.layout.activity_fragment, container, false);
}
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null) {
parent.removeView(view);// 先移除
}
return view;
}

@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.i("slide", "ActivityFragment--onPause");
}

@Override
public void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.i("slide", "ActivityFragment--onStop");
}

@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.i("slide", "ActivityFragment--onDestroy");
}
}

MyViewPagerAdapter的代码：

package com.llb.adapter;

import java.util.ArrayList;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
/**
* 这个adapter里面有Fragment数组
* @author llb
*
*/
public class MyViewPagerAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> fragments;//需要添加到上面的Fragment

public MyViewPagerAdapter(FragmentManager fm) {
super(fm);
}
/**
* 自定义的构造函数
* @param fm
* @param fragments ArrayList<Fragment>
*/
public MyViewPagerAdapter(FragmentManager fm,ArrayList<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int arg0) {
return fragments.get(arg0);//返回Fragment对象
}
@Override
public int getCount() {
return fragments.size();//返回Fragment的个数
}
}

整个项目源码如下：http://download.csdn.net/detail/abc13939746593/6656809