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();
}

}
}

<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>

<?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>