package com.llf.basemodel.image;
import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.llf.basemodel.R;
import com.llf.basemodel.utils.ImageLoaderUtils;
import com.llf.basemodel.utils.SettingUtil;
import java.util.ArrayList;
import java.util.List;
/**
* Created by llf on 2017/3/9.
* 广告轮播
*/
public class BannelView extends FrameLayout implements ViewPager.OnPageChangeListener {
private static final String TAG = "BannelView";
private Context mContext;
private ViewPager mViewPager;//实现轮播图的ViewPager
private TextView mTitle;//标题
private LinearLayout mIndicatorLayout; // 指示器
private Handler handler;//每几秒后执行下一张的切换
private int WHEEL = 100; // 转动
private int WHEEL_WAIT = 101; // 等待
private List<View> mViews = new ArrayList<>(); //需要轮播的View，数量为轮播图数量+2
private ImageView[] mIndicators; //指示器小圆点
private boolean isScrolling = false; // 滚动框是否滚动着
private boolean isCycle = true; // 是否循环，默认为true
private boolean isWheel = true; // 是否自动轮播，默认为true
private int delay = 4000; // 默认轮播时间
private int mCurrentPosition = 0; // 轮播当前位置
private long releaseTime = 0; // 手指松开、页面不滚动时间，防止手机松开后短时间进行切换
private ViewPagerAdapter mAdapter;
private ImageCycleViewListener mImageCycleViewListener;
private List<Info> infos;//数据集合
final Runnable runnable = new Runnable() {
@Override
public void run() {
if (mContext != null && isWheel) {
long now = System.currentTimeMillis();
// 检测上一次滑动时间与本次之间是否有触击(手滑动)操作，有的话等待下次轮播
if (now - releaseTime > delay - 500) {
handler.sendEmptyMessage(WHEEL);
} else {
handler.sendEmptyMessage(WHEEL_WAIT);
}
}
}
};
public BannelView(Context context) {
this(context, null);
}
public BannelView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BannelView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
initView();
}
/**
* 初始化View
*/
private void initView() {
LayoutInflater.from(mContext).inflate(R.layout.view_bannel, this, true);
mViewPager = (ViewPager) findViewById(R.id.viewPage);
mTitle = (TextView) findViewById(R.id.cycle_title);
mIndicatorLayout = (LinearLayout) findViewById(R.id.bannel_indicator);
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == WHEEL && mViews.size() > 0) {
if (!isScrolling) {
//当前为非滚动状态，切换到下一页
int posttion = (mCurrentPosition + 1) % mViews.size();
mViewPager.setCurrentItem(posttion, true);
}
releaseTime = System.currentTimeMillis();
handler.removeCallbacks(runnable);
handler.postDelayed(runnable, delay);
return;
}
if (msg.what == WHEEL_WAIT && mViews.size() > 0) {
handler.removeCallbacks(runnable);
handler.postDelayed(runnable, delay);
}
}
};
}
public void setData(List<Info> list, ImageCycleViewListener listener) {
setData(list, listener, 0);
}
/**
* 初始化viewpager
*
* @param list 要显示的数据
* @param showPosition 默认显示位置
*/
public void setData(List<Info> list, ImageCycleViewListener listener,
int showPosition) {
if (list == null || list.size() == 0) {
//没有数据时隐藏整个布局
this.setVisibility(View.GONE);
return;
}
mViews.clear();
infos = list;
if (isCycle) {
//添加轮播图View，数量为集合数+2
// 将最后一个View添加进来
mViews.add(getImageView(mContext, infos.get(infos.size() - 1).getUrl()));
for (int i = 0; i < infos.size(); i++) {
mViews.add(getImageView(mContext, infos.get(i).getUrl()));
}
// 将第一个View添加进来
mViews.add(getImageView(mContext, infos.get(0).getUrl()));
} else {
//只添加对应数量的View
for (int i = 0; i < infos.size(); i++) {
mViews.add(getImageView(mContext, infos.get(i).getUrl()));
}
}
mImageCycleViewListener = listener;
int ivSize = mViews.size();
// 设置指示器
mIndicators = new ImageView[ivSize];
if (isCycle)
mIndicators = new ImageView[ivSize - 2];
mIndicatorLayout.removeAllViews();
for (int i = 0; i < mIndicators.length; i++) {
mIndicators[i] = new ImageView(mContext);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(SettingUtil.dip2px(mContext, 10), 0, SettingUtil.dip2px(mContext, 10), 0);
mIndicators[i].setLayoutParams(lp);
mIndicators[i].setBackgroundResource(R.drawable.selector_guide_bg);
mIndicators[i].setScaleType(ImageView.ScaleType.CENTER_CROP);
mIndicatorLayout.addView(mIndicators[i]);
}
mAdapter = new ViewPagerAdapter();
// 默认指向第一项，下方viewPager.setCurrentItem将触发重新计算指示器指向
setIndicator(0);
mViewPager.setOffscreenPageLimit(3);
mViewPager.addOnPageChangeListener(this);
mViewPager.setAdapter(mAdapter);
if (showPosition < 0 || showPosition >= mViews.size())
showPosition = 0;
if (isCycle) {
showPosition = showPosition + 1;
}
mViewPager.setCurrentItem(showPosition);
setWheel(true);//设置轮播
}
/**
* 获取轮播图View
*
* @param context
* @param url
*/
private View getImageView(Context context, String url) {
RelativeLayout rl = new RelativeLayout(context);
//添加一个ImageView，并加载图片
ImageView imageView = new ImageView(context);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.MATCH_PARENT);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(layoutParams);
ImageLoaderUtils.loadingImg(context,imageView,url);
//在Imageview前添加一个半透明的黑色背景，防止文字和图片混在一起
ImageView backGround = new ImageView(context);
backGround.setLayoutParams(layoutParams);
backGround.setBackgroundColor(Color.parseColor("#44222222"));
rl.addView(imageView);
rl.addView(backGround);
return rl;
}
/**
* 设置指示器
*
* @param selectedPosition 默认指示器位置
*/
private void setIndicator(int selectedPosition) {
setText(mTitle, infos.get(selectedPosition).getTitle());
try {
for (int i = 0; i < mIndicators.length; i++) {
mIndicators[i].setSelected(false);
}
if (mIndicators.length > selectedPosition)
mIndicators[selectedPosition].setSelected(true);
} catch (Exception e) {
Log.i(TAG, "指示器路径不正确");
}
}
/**
* 页面适配器 返回对应的view
*/
private class ViewPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return mViews.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public View instantiateItem(ViewGroup container, final int position) {
View v = mViews.get(position);
if (mImageCycleViewListener != null) {
v.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mImageCycleViewListener.onImageClick(infos.get(mCurrentPosition - 1));
}
});
}
container.addView(v);
return v;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
@Override
public void onPageScrolled(
int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int arg0) {
int max = mViews.size() - 1;
int position = arg0;
mCurrentPosition = arg0;
if (isCycle) {
if (arg0 == 0) {
//滚动到mView的1个（界面上的最后一个），将mCurrentPosition设置为max - 1
mCurrentPosition = max - 1;
} else if (arg0 == max) {
//滚动到mView的最后一个（界面上的第一个），将mCurrentPosition设置为1
mCurrentPosition = 1;
}
position = mCurrentPosition - 1;
}
setIndicator(position);
}
@Override
public void onPageScrollStateChanged(int state) {
if (state == 1) { // viewPager在滚动
isScrolling = true;
return;
} else if (state == 0) { // viewPager滚动结束
releaseTime = System.currentTimeMillis();
//跳转到第mCurrentPosition个页面（没有动画效果，实际效果页面上没变化）
mViewPager.setCurrentItem(mCurrentPosition, false);
}
isScrolling = false;
}
/**
* 为textview设置文字
*
* @param textView
* @param text
*/
public static void setText(TextView textView, String text) {
if (text != null && textView != null) textView.setText(text);
}
/**
* 是否循环，默认开启。必须在setData前调用
*
* @param isCycle 是否循环
*/
public void setCycle(boolean isCycle) {
this.isCycle = isCycle;
}
/**
* 是否处于循环状态
*
* @return
*/
public boolean isCycle() {
return isCycle;
}
/**
* 设置是否自动轮播，默认自动轮播,轮播一定是循环的
*
* @param isWheel
*/
public void setWheel(boolean isWheel) {
this.isWheel = isWheel;
isCycle = true;
if (isWheel) {
handler.postDelayed(runnable, delay);
}
}
/**
* 刷新数据，当外部视图更新后，通知刷新数据
*/
public void refreshData() {
if (mAdapter != null)
mAdapter.notifyDataSetChanged();
}
/**
* 是否处于轮播状态
*
* @return
*/
public boolean isWheel() {
return isWheel;
}
/**
* 设置轮播暂停时间,单位毫秒（默认4000毫秒）
*
* @param delay
*/
public void setDelay(int delay) {
this.delay = delay;
}
/**
* 轮播控件的监听事件
*
* @author minking
*/
public interface ImageCycleViewListener {
/**
* 单击图片事件
*
* @param info
*/
void onImageClick(Info info);
}
}