package com.amlogic.tzr.charismatic_yichang.view;
import android.content.Context;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.amlogic.tzr.charismatic_yichang.R;
import java.util.ArrayList;
import java.util.List;
/**
* 广告图片自动轮播控件</br>
*
* <pre>
* 集合ViewPager和指示器的一个轮播控件,主要用于一般常见的广告图片轮播,具有自动轮播和手动轮播功能
* 使用:只需在xml文件中使用{@code <com.minking.imagecycleview.ImageCycleView/>} ,
* 然后在页面中调用 {@link #setImageResources(ArrayList, ImageCycleViewListener) }即可!
*
* 另外提供{@link #startImageCycle() } \ {@link #pushImageCycle() }两种方法,用于在Activity不可见之时节省资源;
* 因为自动轮播需要进行控制,有利于内存管理
* </pre>
*
* @author minking
*/
public class ImageCycleView extends LinearLayout {
/**
* 上下文
*/
private Context mContext;
/**
* 图片轮播视图
*/
private ViewPager mAdvPager = null;
/**
* 滚动图片视图适配器
*/
private ImageCycleAdapter mAdvAdapter;
/**
* 图片轮播指示器控件
*/
private ViewGroup mGroup;
/**
* 图片轮播指示器-个图
*/
private ImageView mImageView = null;
/**
* 滚动图片指示器-视图列表
*/
private ImageView[] mImageViews = null;
/**
* 图片滚动当前图片下标
*/
private int mImageIndex = 0;
/**
* 手机密度
*/
private float mScale;
/**
* @param context
*/
public ImageCycleView(Context context) {
super(context);
}
/**
* @param context
* @param attrs
*/
public ImageCycleView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
mScale = context.getResources().getDisplayMetrics().density;
LayoutInflater.from(context).inflate(R.layout.ad_cycle_view, this);
mAdvPager = (ViewPager) findViewById(R.id.adv_pager);
mAdvPager.setOnPageChangeListener(new GuidePageChangeListener());
mAdvPager.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
// 开始图片滚动
startImageTimerTask();
break;
default:
// 停止图片滚动
stopImageTimerTask();
break;
}
return false;
}
});
// 滚动图片右下指示器视图
mGroup = (ViewGroup) findViewById(R.id.viewGroup);
}
/**
* 装填图片数据
*
* @param imageUrlList
* @param imageCycleViewListener
*/
public void setImageResources(List<String> imageUrlList, ImageCycleViewListener imageCycleViewListener) {
// 清除所有子视图
mGroup.removeAllViews();
// 图片广告数量
final int imageCount = imageUrlList.size();
mImageViews = new ImageView[imageCount];
for (int i = 0; i < imageCount; i++) {
mImageView = new ImageView(mContext);
int imageParams = (int) ((mScale * 20 + 0.5f)/2);// XP与DP转换,适应不同分辨率
int imagePadding = (int)(mScale * 5 + 0.5f);
mImageView.setLayoutParams(new LayoutParams(imageParams, imageParams));
mImageView.setPadding(imagePadding, imagePadding, imagePadding, imagePadding);
mImageViews[i] = mImageView;
if (i == 0) {
mImageViews[i].setBackgroundResource(R.mipmap.home_img_ratio_selected);
} else {
mImageViews[i].setBackgroundResource(R.mipmap.home_img_ratio);
}
mGroup.addView(mImageViews[i]);
}
mAdvAdapter = new ImageCycleAdapter(mContext, imageUrlList, imageCycleViewListener);
mAdvPager.setAdapter(mAdvAdapter);
startImageTimerTask();
}
/**
* 开始轮播(手动控制自动轮播与否,便于资源控制)
*/
public void startImageCycle() {
startImageTimerTask();
}
/**
* 暂停轮播——用于节省资源
*/
public void pushImageCycle() {
stopImageTimerTask();
}
/**
* 开始图片滚动任务
*/
private void startImageTimerTask() {
stopImageTimerTask();
// 图片每3秒滚动一次
mHandler.postDelayed(mImageTimerTask, 3000);
}
/**
* 停止图片滚动任务
*/
private void stopImageTimerTask() {
mHandler.removeCallbacks(mImageTimerTask);
}
private Handler mHandler = new Handler();
/**
* 图片自动轮播Task
*/
private Runnable mImageTimerTask = new Runnable() {
@Override
public void run() {
if (mImageViews != null) {
// 下标等于图片列表长度说明已滚动到最后一张图片,重置下标
if ((++mImageIndex) == mImageViews.length) {
mImageIndex = 0;
}
mAdvPager.setCurrentItem(mImageIndex);
}
}
};
/**
* 轮播图片状态监听器
*
* @author minking
*/
private final class GuidePageChangeListener implements OnPageChangeListener {
@Override
public void onPageScrollStateChanged(int state) {
if (state == ViewPager.SCROLL_STATE_IDLE)
startImageTimerTask(); // 开始下次计时
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int index) {
// 设置当前显示的图片下标
mImageIndex = index;
// 设置图片滚动指示器背景
mImageViews[index].setBackgroundResource(R.mipmap.home_img_ratio_selected);
for (int i = 0; i < mImageViews.length; i++) {
if (index != i) {
mImageViews[i].setBackgroundResource(R.mipmap.home_img_ratio);
}
}
}
}
private class ImageCycleAdapter extends PagerAdapter {
/**
* 图片视图缓存列表
*/
private List<ImageView> mImageViewCacheList;
/**
* 图片资源列表
*/
private List<String> mAdList = new ArrayList<String>();
/**
* 广告图片点击监听器
*/
private ImageCycleViewListener mImageCycleViewListener;
private Context mContext;
public ImageCycleAdapter(Context context, List<String> adList, ImageCycleViewListener imageCycleViewListener) {
mContext = context;
mAdList = adList;
mImageCycleViewListener = imageCycleViewListener;
mImageViewCacheList = new ArrayList<ImageView>();
}
@Override
public int getCount() {
return mAdList.size();
}
@Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
String imageUrl = mAdList.get(position);
ImageView imageView = null;
if (mImageViewCacheList.isEmpty()) {
imageView = new ImageView(mContext);
imageView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
} else {
imageView = mImageViewCacheList.remove(0);
}
// 设置图片点击监听
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mImageCycleViewListener.onImageClick(position, v);
}
});
imageView.setTag(imageUrl);
container.addView(imageView);
mImageCycleViewListener.displayImage(imageUrl, imageView);
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
ImageView view = (ImageView) object;
container.removeView(view);
mImageViewCacheList.add(view);
}
}
/**
* 轮播控件的监听事件
*
* @author minking
*/
public static interface ImageCycleViewListener {
/**
* 加载图片资源
*
* @param imageURL
* @param imageView
*/
public void displayImage(String imageURL, ImageView imageView);
/**
* 单击图片事件
*
* @param position
* @param imageView
*/
public void onImageClick(int position, View imageView);
}
}