ViewPager实现引导页

package com.example.viewpage2;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnPageChangeListener,OnClickListener{

private ViewPager vp;
private List<View> views;
private int[] imgs = { R.drawable.img1, R.drawable.img2, R.drawable.img3,
R.drawable.img4 };
private ViewPageAdapter vpa;
private LinearLayout ll;
private ImageView[] points;
private int index;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
initPoint();

}

private void initView() {
ll = (LinearLayout) findViewById(R.id.ll);
vp = (ViewPager) findViewById(R.id.vp);
views = new ArrayList<View>();
}

private void initData() {
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
for (int i : imgs) {
ImageView img = new ImageView(this);
img.setImageResource(i);
img.setLayoutParams(lp);
views.add(img);

}
vpa = new ViewPageAdapter(views);
vp.setAdapter(vpa);
vp.setOnPageChangeListener(this);
}
private void initPoint(){
points = new ImageView[imgs.length];
//首先先定义一个imageview数组来接收他们，因为他们在linearlayout里
//所以通过循环把他们都放在数组里，并且让他们都设置成未选中状态，
for (int i = 0; i < ll.getChildCount(); i++) {
points[i] = (ImageView) ll.getChildAt(i);
points[i].setImageResource(R.drawable.point_two);
points[i].setOnClickListener(this);
points[i].setTag(i);
}
//因为第一页是选中状态所以我们要定义一个数组下表来表示选中的状态
index = 0;
points[index].setImageResource(R.drawable.point_one);
}

@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub

}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub

}

@Override//新页面选中时候调用
public void onPageSelected(int position) {
for (int i = 0; i < ll.getChildCount(); i++) {
points[i] = (ImageView) ll.getChildAt(i);
points[i].setImageResource(R.drawable.point_two);
}
points[position].setImageResource(R.drawable.point_one);

}

@Override
public void onClick(View v) {
int i = (Integer)v.getTag();
vp.setCurrentItem(i);

}

}

<FrameLayout 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.support.v4.view.ViewPager
android:id="@+id/vp"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v4.view.ViewPager>

<LinearLayout
android:id="@+id/ll"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="bottom|center_horizontal" >

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/point_one"
android:padding="15dp"
/>

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/point_two"
android:padding="15dp" />

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/point_two"
android:padding="15dp" />

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/point_two"
android:padding="15dp" />
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳过引导页"
android:layout_marginLeft="200dp"

/>

</FrameLayout>

package com.example.viewpage2;

import java.util.List;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public class ViewPageAdapter extends PagerAdapter {
List<View> views;
public ViewPageAdapter(List<View> views){
this.views = views;
}
@Override
//返回页数
public int getCount() {
// TODO Auto-generated method stub
return views.size();
}
@Override
//初始化position数值下的图片
public Object instantiateItem(View container, int position) {
((ViewPager)container).addView(views.get(position));
return views.get(position);
}
@Override
//判断是否由界面生成对象
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0==arg1;
}
@Override
//销毁上一个图片
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager)container).removeView(views.get(position));
}

}