ViewPger自动轮播与滑动

package com.example.mypic;


import java.util.ArrayList;


import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;


import com.lidroid.xutils.BitmapUtils;


public class MainActivity extends Activity {


private ViewPager viewPager;
private LinearLayout ll_dot;
private String[] imageUrls = new String[] {
"http://pic8.nipic.com/20100701/5290458_114840036316_2.jpg",
"http://pic2.nipic.com/20090424/1468853_230119053_2.jpg",
"http://img3.3lian.com/2013/s1/20/d/57.jpg",
"http://pic39.nipic.com/20140226/18071023_164300608000_2.jpg",
"http://a0.att.hudong.com/15/08/300218769736132194086202411_950.jpg" };


//private String[] imageUrls = new String[] {
//"http://192.168.230.1:8080/ab.jpg",
//"http://192.168.230.1:8080/ae.jpg",
//"http://192.168.230.1:8080/af.jpg",
//"http://192.168.230.1:8080/ah.jpg" };


private ArrayList<ImageView> viewList;
private ArrayList<ImageView> dotList;
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
// 先去获取到当前条目索引
int currentItem = viewPager.getCurrentItem();
// 条目索引+1
currentItem++;
// 重新设置给viewPager
viewPager.setCurrentItem(currentItem);
// 再调用发延时消息的方法
sendDelayMessage();
};
};


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewPager);
ll_dot = (LinearLayout) findViewById(R.id.ll_dot);
// 初始化图片
initViewList();
// 初始化小圆点
initDots();
// 设置数据适配器
viewPager.setAdapter(new MyPagerAdapter(this, viewList, handler));
// 设置初始的展示条目
viewPager.setCurrentItem(viewList.size() * 100000);
// 设置延时切换
sendDelayMessage();


// 监听viewPager的一个滑动事件
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// 遍历小点的集合
for (int i = 0; i < dotList.size(); i++) {
// 如果当前的索引值和i相等
if (position % dotList.size() == i) {
// 设置小点为亮色
dotList.get(i).setImageResource(R.drawable.dot_focuse);
} else {
// 否则暗色
dotList.get(i).setImageResource(R.drawable.dot_normal);
}
}
}


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


}


@Override
public void onPageScrollStateChanged(int arg0) {


}
});
}


/**
* 发送延时消息
*/
private void sendDelayMessage() {
handler.sendEmptyMessageDelayed(0, 2000);
}


private void initDots() {
// 创建一个装小点控件的集合
dotList = new ArrayList<ImageView>();
dotList.clear();
for (int i = 0; i < imageUrls.length; i++) {
ImageView imageView = new ImageView(this);
if (i == 0) {
// 如果是第一张，默认给一个亮的小点
imageView.setImageResource(R.drawable.dot_focuse);
} else {
// 如果不是滴一个，默认给一个暗的小点
imageView.setImageResource(R.drawable.dot_normal);
}
// 设置小点的默认宽高为20dp
LayoutParams params = new LayoutParams(20, 20);
// 设置小点的间距
params.setMargins(5, 0, 5, 0);
ll_dot.addView(imageView, params);
// 往小点集合中添加view
dotList.add(imageView);
}
}


private void initViewList() {
// 先使用xutils的工具类
BitmapUtils bitmapUtils = new BitmapUtils(this);
viewList = new ArrayList<ImageView>();
for (int i = 0; i < imageUrls.length; i++) {
// 创建imageView 并通过工具类将图片设置到控件上
ImageView imageView = new ImageView(this);
bitmapUtils.display(imageView, imageUrls[i]);
viewList.add(imageView);
}
}

}

package com.example.mypic;


import java.util.List;


import android.content.Context;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ImageView;


public class MyPagerAdapter extends PagerAdapter {
private List<ImageView> viewList;
private Context context;
private Handler handler;


public MyPagerAdapter(Context context, List<ImageView> viewList,
Handler handler) {
this.context = context;
this.viewList = viewList;
this.handler = handler;
}


@Override
public int getCount() {
return Integer.MAX_VALUE;
}


@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}


@Override
public Object instantiateItem(ViewGroup container, int position) {
// 通过控件集合获取imageView 添加到容器中，并作为key 返回
ImageView imageView = viewList.get(position % viewList.size());
imageView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
// 当按下的时候，停止轮播
case MotionEvent.ACTION_DOWN:
// 移除所有的回调和消息
handler.removeCallbacksAndMessages(null);
break;
// 抬起
case MotionEvent.ACTION_UP:
handler.sendEmptyMessageDelayed(0, 2000);
break;
// 取消的时候，继续开始录播
case MotionEvent.ACTION_CANCEL:
handler.sendEmptyMessageDelayed(0, 2000);
break;
default:
break;
}
//触摸事件不被消费，true 消费该触摸事件
return true;
}
});
container.addView(imageView);
return imageView;
}


@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// super.destroyItem(container, position, object);
container.removeView((View) object);
}
}