ViewPager fragment android tab选项卡的使用

public class MainActivity extends Activity implements View.OnClickListener, ViewPager.OnPageChangeListener {
private RadioButton rb_my, rb_withdrawals;
private MyFragment mMyFragment;
private WithdrawalsFragment mWithdrawalsFragment;
private ViewPager vp_main;
private ArrayList<Fragment> mFragmentList;
private MyViewPagerAdapter mViewPagerAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViews();
setListensers();
InitView();
}
protected void findViews() {
rb_withdrawals = (RadioButton) findViewById(R.id.rb_withdrawals);
rb_my = (RadioButton) findViewById(R.id.rb_my);
vp_main = (ViewPager) findViewById(R.id.vp_main);
}

@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.rb_withdrawals:
vp_main.setCurrentItem(0);
break;
case R.id.rb_my:
vp_main.setCurrentItem(1);
break;
default:
break;
}
}

protected void setListensers() {
rb_withdrawals.setOnClickListener(this);
rb_my.setOnClickListener(this);
vp_main.setOnPageChangeListener(this);
}

@Override
public void onPageScrollStateChanged(int arg0) {

}

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

}

@Override
public void onPageSelected(int id) {
switch (id) {
case 0:
rb_withdrawals.setChecked(true);
break;
case 1:
rb_my.setChecked(true);
break;
default:
break;
}
}

private void addFragment() {
if (mWithdrawalsFragment == null) {
mWithdrawalsFragment = new WithdrawalsFragment();
}
if (mMyFragment == null) {
mMyFragment = new MyFragment();
}

if (mFragmentList == null) {
mFragmentList = new ArrayList<Fragment>();// 初始化数据
mFragmentList.add(mWithdrawalsFragment);
mFragmentList.add(mMyFragment);
}
}

private void setViewPager() {
if (mViewPagerAdapter == null) {
mViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager(), mFragmentList);
vp_main.setAdapter(mViewPagerAdapter);
vp_main.setOffscreenPageLimit(3);
}
}

private void InitView() {
addFragment();
setViewPager();
}
}

<?xml version="1.0" encoding="utf-8"?>
<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:background="@color/screen_bg"
tools:context=".activity.MainActivity">

<RadioGroup
android:id="@+id/rg_control_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@color/white"
android:orientation="horizontal"
android:paddingBottom="10dp"
android:paddingTop="10dp">

<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/radio_tab_home"
android:button="@null"
android:textColor="@color/light_gray"
android:textSize="12dp"
android:visibility="gone"/>

<RadioButton
android:id="@+id/rb_withdrawals"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/get_red_package_select"
android:button="@null"
android:textColor="@color/light_gray"
android:textSize="12dp" />

<RadioButton
android:id="@+id/rb_my"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/radio_tab_my"
android:button="@null"
android:textColor="@color/light_gray"
android:textSize="12dp" />
</RadioGroup>

<android.support.v4.view.ViewPager
android:id="@+id/vp_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/rg_control_button"
android:flipInterval="30"
android:persistentDrawingCache="animation" />

<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_below="@id/vp_main"
android:background="#60777777" />
</RelativeLayout>