ViewPager

ViewPager的功能是页面滑动，可以用来制作引导页，也可以实现程序中多个视图切换的效果。

ViewPager填充可以使用PagerAdapter

下面用代码介绍其使用方法

guide.xml布局

<?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">

<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF000000"
></android.support.v4.view.ViewPager>

</LinearLayout>

red.xml布局

<?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"
android:background="#EE0000">

</LinearLayout>

black.xml布局

<?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"
android:background="#000000">

</LinearLayout>

green.xml 布局

<?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"
android:background="#AACC44">

</LinearLayout>

Guide的实现

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;

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

public class Guide extends Activity {

private ViewPagerAdapter viewPagerAdapter;
private ViewPager viewPager;
private List<View> views;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide);
InitView();
}
private void InitView(){
LayoutInflater inflater = LayoutInflater.from(this);
viewPager = (ViewPager)findViewById(R.id.view_pager);
views = new ArrayList<View>();
views.add(inflater.inflate(R.layout.red,null));
views.add(inflater.inflate(R.layout.black,null));
views.add(inflater.inflate(R.layout.green,null));
viewPagerAdapter = new ViewPagerAdapter(this,views);
viewPager.setAdapter(viewPagerAdapter);
}
}

ViewPagerAdapter的实现

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import java.util.List;

public class ViewPagerAdapter extends PagerAdapter {
private List<View> views;
private Context context;
public ViewPagerAdapter(Context context,List<View> views){
this.context = context;
this.views = views;
}
@Override
public int getCount(){
return views.size();
}
@Override
public Object instantiateItem(ViewGroup container,int position){
container.addView(views.get(position));
return views.get(position);
}
@Override
public boolean isViewFromObject(View view,Object o){
return (view == o);
}
@Override
public void destroyItem(ViewGroup container,int position,Object object){
container.removeView(views.get(position));
}
}

添加ViewPager控件的时候记得要写全android.support.v4.view.ViewPager

防止出现版本上的问题