图片发自简书App

1、引入android-support-v4.jar包，在主布局里加入

< ?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:orientation="vertical"

android:id="@+id/layout"

tools:context="com.zjq.viewpager.MainActivity">

< android.support.v4.view.ViewPager

android:id="@+id/viewPager"

android:layout_width="match_parent"

android:layout_height="wrap_content">

< /android.support.v4.view.ViewPager>

< LinearLayout

android:id="@+id/viewGroup"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

android:layout_marginBottom="40dp"

android:gravity="center_horizontal"

android:orientation="horizontal" >

< /LinearLayout>

< /RelativeLayout >

其他几个子布局都一样 例如 item01 :

< ?xml version="1.0" encoding="utf-8"?>

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent">

< ImageView

android:layout_width="match_parent"

android:layout_height="match_parent"

android:src="@drawable/view1"

android:scaleType="centerCrop"

/>

2、加载切换内容

3、ViewPager加载适配器PagerAdapter

public class MainActivity extends Activity {

private ViewPager viewPager;

private ArrayList pageview;

private ImageView imageView;

private ImageView[] imageViews;

//包裹点点的LinearLayout

private ViewGroup group;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//设置无标题栏

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

viewPager = (ViewPager) findViewById(R.id.viewPager);

//查找布局文件用LayoutInflater.inflate

LayoutInflater inflater =getLayoutInflater();

View view1 = inflater.inflate(R.layout.item01, null);

View view2 = inflater.inflate(R.layout.item02, null);

View view3 = inflater.inflate(R.layout.item03, null);

View view4 = inflater.inflate(R.layout.item04, null);

//将view装入数组

pageview =new ArrayList();

pageview.add(view1);

pageview.add(view2);

pageview.add(view3);

pageview.add(view4);

group = (ViewGroup)findViewById(R.id.viewGroup);

//有多少张图就有多少个点点

imageViews = new ImageView[pageview.size()];

for(int i =0;i

imageView = new ImageView(MainActivity.this);

imageView.setLayoutParams(new LayoutParams(20,20));

imageView.setPadding(20, 0, 20, 0);

imageViews[i] = imageView;

//默认第一张图显示为选中状态

if (i == 0) {

imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);

} else {

imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);

}

group.addView(imageViews[i]);

}

//绑定适配器

viewPager.setAdapter(mPagerAdapter);

//绑定监听事件

viewPager.setOnPageChangeListener(new GuidePageChangeListener());

}

//数据适配器

PagerAdapter mPagerAdapter = new PagerAdapter(){

@Override

//获取当前窗体界面数

public int getCount() {

// TODO Auto-generated method stub

return pageview.size();

}

@Override

//断是否由对象生成界面

public boolean isViewFromObject(View arg0, Object arg1) {

// TODO Auto-generated method stub

return arg0==arg1;

}

//是从ViewGroup中移出当前View

public void destroyItem(View arg0, int arg1, Object arg2) {

((ViewPager) arg0).removeView(pageview.get(arg1));

}

//返回一个对象，这个对象表明了PagerAdapter适配器选择哪个对象放在当前的ViewPager中

public Object instantiateItem(View arg0, int arg1){

((ViewPager)arg0).addView(pageview.get(arg1));

return pageview.get(arg1);

}

};

//pageView监听器

class GuidePageChangeListener implements OnPageChangeListener{

@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

//如果切换了，就把当前的点点设置为选中背景，其他设置未选中背景

public void onPageSelected(int arg0) {

// TODO Auto-generated method stub

for(int i=0;i

imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);

if (arg0 != i) {

imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);

}

}

}

} }