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