Android - MyViewPagerActivity.java

package com.example.droid;

import java.util.ArrayList;

import com.example.droid.util.MyFragment;

import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.Menu;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MyViewPagerActivity extends FragmentActivity {
    private ViewPager viewPager;
    private MyAdapter adapter;
    private Fragment fragment_1;
    private Fragment fragment_2;
    private RadioGroup radioGroup;
    
    private OnCheckedChangeListener keyChangeListener = new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
            Log.i("onChecked", "" + checkedId); 
            int position = 0;
            switch (checkedId) {
                case R.id.radio_1:
                    position = 0;
                    break;
                case R.id.radio_2:
                    position = 1;
                    break;
                default:
                    break;
            }
            viewPager.setCurrentItem(position);
        }
    };
    
    private OnPageChangeListener pageChangeListener = new OnPageChangeListener() {
        
        @Override
        public void onPageSelected(int position) {
            Log.i("onPageChange", "" + position);
            int checkedId = R.id.radio_1;
            switch (position) {
                case 0:
                    checkedId = R.id.radio_1;
                    break;
                case 1:
                    checkedId = R.id.radio_2;
                    break;
                default:
                    break;
            }
            radioGroup.check(checkedId);
        }
        
        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
            
        }
        
        @Override
        public void onPageScrollStateChanged(int position) {
        }
    }; 
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_view_pager);
        init();
    }

    private void init () {
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
        fragment_1 = new MyFragment();
        fragment_2 = new MyFragment();
        adapter = new MyAdapter(getSupportFragmentManager());
        adapter.addFragment(fragment_1);
        adapter.addFragment(fragment_2);
        viewPager.setAdapter(adapter);
        radioGroup.setOnCheckedChangeListener(keyChangeListener);
        viewPager.setOnPageChangeListener(pageChangeListener);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.my_view_pager, menu);
        return true;
    }
    
    
    static class MyAdapter extends FragmentPagerAdapter {
        ArrayList<Fragment> fragmentList;
        
        public MyAdapter(FragmentManager fm) {
            super(fm);
            fragmentList = new ArrayList<Fragment>();
            // TODO Auto-generated constructor stub
        }
        
        public void addFragment (Fragment fragment) {
            if (!fragmentList.contains(fragment)) {
                fragmentList.add(fragment);
            }
        }

        @Override
        public Fragment getItem(int position) {
            return fragmentList == null ? null : fragmentList.get(position);
        }

        @Override
        public int getCount() {
            return fragmentList == null ? 0 : fragmentList.size();
        }
        
    }
}

 

activity_my_view_pager.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MyViewPagerActivity" >

    <RadioGroup
        android:id="@+id/radioGroup"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <RadioButton android:id="@+id/radio_1"
            android:checked="true"
            android:button="@null"
            android:background="@drawable/selector_fragment_1"
            android:layout_width="wrap_content"/>
        <RadioButton android:id="@+id/radio_2"
            android:button="@null"
            android:background="@drawable/selector_fragment_2"
            android:layout_width="wrap_content"/>
    </RadioGroup>
    <android.support.v4.view.ViewPager 
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/radioGroup" />

</RelativeLayout>

 

res/drawable/selector_fragment_1.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/icon_4_n"
        android:state_checked="false" />
    <item android:drawable="@drawable/icon_4_d"
        android:state_checked="true" />
</selector>