接着是主要的部分，也就是一系列的功能介绍图片，主要是viewpager来实现，嵌套在上面的小圆点的跟随导航也是要实现的效果之一
package com.example.weichat.UI;
import java.util.ArrayList;
import Android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.ImageView;
import com.example.weichat.R;
/** What's new 的导航界面 */
public class WhatsnewPagesA extends Activity {
/** Viewpager对象 */
private ViewPager viewPager;
private ImageView imageView;
/** 创建一个数组，用来存放每个页面要显示的View */
private ArrayList<View> pageViews;
/** 创建一个imageview类型的数组，用来表示导航小圆点 */
private ImageView[] imageViews;
/** 装显示图片的viewgroup */
private ViewGroup viewPictures;
/** 导航小圆点的viewgroup */
private ViewGroup viewPoints;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
LayoutInflater inflater = getLayoutInflater();
pageViews = new ArrayList<View>();
pageViews.add(inflater.inflate(R.layout.viewpager01, null));
pageViews.add(inflater.inflate(R.layout.viewpager02, null));
pageViews.add(inflater.inflate(R.layout.viewpager03, null));
pageViews.add(inflater.inflate(R.layout.viewpager04, null));
pageViews.add(inflater.inflate(R.layout.viewpager05, null));
pageViews.add(inflater.inflate(R.layout.viewpager06, null));
// 小圆点数组，大小是图片的个数
imageViews = new ImageView[pageViews.size()];
// 从指定的XML文件中加载视图
viewPictures = (ViewGroup) inflater.inflate(R.layout.viewpagers, null);
viewPager = (ViewPager) viewPictures.findViewById(R.id.guidePagers);
viewPoints = (ViewGroup) viewPictures.findViewById(R.id.viewPoints);
// 添加小圆点导航的图片
for (int i = 0; i < pageViews.size(); i++) {
imageView = new ImageView(WhatsnewPagesA.this);
imageView.setLayoutParams(new LayoutParams(20, 20));
imageView.setPadding(5, 0, 5, 0);
// 吧小圆点放进数组中
imageViews[i] = imageView;
// 默认选中的是第一张图片，此时第一个小圆点是选中状态，其他不是
if (i == 0)
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_focused));
else
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_unfocused));
// 将imageviews添加到小圆点视图组
viewPoints.addView(imageViews[i]);
}
setContentView(viewPictures);
viewPager.setAdapter(new NavigationPageAdapter());
// 为viewpager添加监听，当view发生变化时的响应
viewPager.setOnPageChangeListener(new NavigationPageChangeListener());
}
// 导航图片view的适配器，必须要实现的是下面四个方法
class NavigationPageAdapter extends PagerAdapter {
@Override
public int getCount() {
return pageViews.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
// 初始化每个Item
@Override
public Object instantiateItem(View container, int position) {
((ViewPager) container).addView(pageViews.get(position));
return pageViews.get(position);
}
// 销毁每个Item
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView(pageViews.get(position));
}
}
// viewpager的监听器，主要是onPageSelected要实现
class NavigationPageChangeListener implements OnPageChangeListener {
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int position) {
// 循环主要是控制导航中每个小圆点的状态
for (int i = 0; i < imageViews.length; i++) {
// 当前view下设置小圆点为选中状态
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_focused));
// 其余设置为飞选中状态
if (position != i)
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_unfocused));
}
}
}
// 开始按钮方法，开始按钮在XML文件中onClick属性设置；
// 我试图把按钮在本activity中实例化并设置点击监听，但总是报错，使用这个方法后没有报错，原因没找到
public void startbutton(View v) {
Intent intent = new Intent(WhatsnewPagesA.this, WhatsnewAnimationA.class);
startActivity(intent);
WhatsnewPagesA.this.finish();
}
}