package adutils;
import android.content.Context;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.bumptech.glide.Glide;
import com.ywl5320.adviewpager.R;
import adapter.ImageViewPagerAdapter;
/**
* Created by ywl on 2016/6/24.
*/
public class AdViewpagerUtil {
private Context context;
private ViewPager viewPager;
private ImageViewPagerAdapter mimageViewPagerAdapter;
private ImageView[] mImageViews;
private String[] urls;
private LinearLayout dotlayout;
private ImageView[] dotViews;
private boolean isRight = true; // 判断viewpager是不是向右滑动
private int lastPosition = 1; // 记录viewpager从哪个页面滑动到当前页面，从而区分滑动方向
private int autoIndex = 1; // 自动轮询时自增坐标，能确定导航圆点的位置
private int currentIndex = 0; //当前item
private int delayTime = 5000; //自动轮播的时间间隔
private int imgsize = 0; //图片的数量，item的数量
private boolean isLoop = false;//轮播开关
private OnAdPageChangeListener onAdPageChangeListener; //pagechange回调
private OnAdItemClickListener onAdItemClickListener; //点击事件回调
private int dotsize = 8; //小圆点的大小宽度
private int dotoffset = 4; //小圆点的间距
/**
* 不带小圆点
* @param context
* @param viewPager
* @param urls
*/
public AdViewpagerUtil(Context context, ViewPager viewPager, String[] urls) {
this.context = context;
this.viewPager = viewPager;
this.urls = urls;
}
/**
* 有小圆点
* @param context
* @param viewPager
* @param dotlayout
* @param dotsize
* @param dotoffset
* @param urls
*/
public AdViewpagerUtil(Context context, ViewPager viewPager, LinearLayout dotlayout, int dotsize, int dotoffset, String[] urls) {
this.context = context;
this.viewPager = viewPager;
this.dotlayout = dotlayout;
this.dotsize = dotsize;
this.urls = urls;
}
public void setOnAdPageChangeListener(OnAdPageChangeListener onAdPageChangeListener) {
this.onAdPageChangeListener = onAdPageChangeListener;
}
public void setOnAdItemClickListener(OnAdItemClickListener onAdItemClickListener) {
this.onAdItemClickListener = onAdItemClickListener;
}
private void initAdimgs(String[] urls)
{
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
int length = urls.length + 2;
mImageViews = new ImageView[length];
for (int i = 0; i <length; i++) {
ImageView imageView = new ImageView(context);
imageView.setLayoutParams(params);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
mImageViews[i] = imageView;
}
setImg(length, urls);
}
private void setImg(int length, String[] urls)
{
if (urls.length > 0) {
imgsize = length;
for (int i = 0; i < length; i++) {
if (i < length - 2) {
final int index = i;
Glide.with(context) .load(urls[i]).into(mImageViews[i + 1]);
mImageViews[i + 1].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(onAdItemClickListener != null)
{
onAdItemClickListener.onItemClick(mImageViews[index + 1], index);
}
}
});
}
}
Glide.with(context) .load(urls[urls.length - 1]).into(mImageViews[0]);
Glide.with(context) .load(urls[0]).into(mImageViews[length - 1]);
}
}
public void initVps()
{
initAdimgs(urls);
initDots(urls.length);
mimageViewPagerAdapter = new ImageViewPagerAdapter(context, mImageViews);
viewPager.setAdapter(mimageViewPagerAdapter);
viewPager.setOffscreenPageLimit(mImageViews.length);
startLoopViewPager();
viewPager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
isLoop = true;
stopLoopViewPager();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
isLoop = false;
startLoopViewPager();
default:
break;
}
return false;
}
});
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
if (isRight) {
if (arg0 != 1) {
if (lastPosition == 0) {
viewPager.setCurrentItem(imgsize - 2, false);
} else if (lastPosition == imgsize - 1) {
viewPager.setCurrentItem(1, false);
}
}
}
if(onAdPageChangeListener != null)
{
onAdPageChangeListener.onPageScrollStateChanged(arg0);
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
if (!isRight) {
if (arg1 < 0.01) {
if (arg0 == 0) {
viewPager.setCurrentItem(imgsize - 2, false);
} else if (arg0 == imgsize - 1) {
viewPager.setCurrentItem(1, false);
}
}
}
if(onAdPageChangeListener != null)
{
onAdPageChangeListener.onPageScrolled(arg0, arg1, arg2);
}
}
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
autoIndex = arg0;
if (lastPosition < arg0 && lastPosition != 0) {
isRight = true;
} else if (lastPosition == imgsize - 1) {
isRight = true;
}
if (lastPosition > arg0 && lastPosition != imgsize - 1) {
isRight = false;
} else if (lastPosition == 0) {
isRight = false;
}
lastPosition = arg0;
if (arg0 == 0) {
currentIndex = imgsize - 2;
} else if (arg0 == imgsize - 1) {
currentIndex = 1;
} else {
currentIndex = arg0;
}
for (int i = 0; i < dotViews.length; i++) {
if (i == currentIndex - 1) {
dotViews[i].setSelected(true);
} else {
dotViews[i].setSelected(false);
}
}
if(onAdPageChangeListener != null)
{
onAdPageChangeListener.onPageSelected(arg0);
}
}
});
viewPager.setCurrentItem(1);// 初始化时设置显示第一页（ViewPager中索引为1）
}
public void initDots(int length)
{
if(dotlayout == null)
return;
dotlayout.removeAllViews();
LinearLayout.LayoutParams mParams = new LinearLayout.LayoutParams(dip2px(context, dotsize), dip2px(context, dotsize));
mParams.setMargins(dip2px(context, dotoffset), 0, dip2px(context, dotoffset), 0);//设置小圆点左右之间的间隔
dotViews = new ImageView[length];
for(int i = 0; i < length; i++)
{
ImageView imageView = new ImageView(context);
imageView.setLayoutParams(mParams);
imageView.setImageResource(R.drawable.dot_selector);
if(i== 0)
{
imageView.setSelected(true);//默认启动时，选中第一个小圆点
}
else {
imageView.setSelected(false);
}
dotViews[i] = imageView;//得到每个小圆点的引用，用于滑动页面时，（onPageSelected方法中）更改它们的状态。
dotlayout.addView(imageView);//添加到布局里面显示
}
}
Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
// 要做的事情
if (viewPager.getChildCount() > 0) {
handler.postDelayed(this, delayTime);
autoIndex++;
viewPager.setCurrentItem(autoIndex % imgsize, true);
}
}
};
private void startLoopViewPager() {
if (!isLoop && viewPager != null) {
handler.postDelayed(runnable, delayTime);// 每两秒执行一次runnable.
isLoop = true;
}
}
private void stopLoopViewPager() {
if (isLoop && viewPager != null) {
handler.removeCallbacks(runnable);
isLoop = false;
}
}
public interface OnAdItemClickListener
{
void onItemClick(View v, int flag);
}
public interface OnAdPageChangeListener
{
void onPageScrollStateChanged(int arg0);
void onPageScrolled(int arg0, float arg1, int arg2);
void onPageSelected(int arg0);
}
public int dip2px(Context context, float dipValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}
}
