一行代码引入 ViewPager 无限循环 + 页码显示

package cn.share.bananacloud.coustomViews.coustomEdittextInput.MyViewPager; import android.app.Activity;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup; /**
* Created by 林冠宏 on 2016/4/9.
*
* viewPager 无限循环
*
*/ public class LoopViewpagerAdapter extends PagerAdapter{ private int images;
private String[] imageUrls;
private View[] views;
private boolean isLooper;
private LayoutInflater layoutInflater;
private getItemViewListener getItemViewListener; public LoopViewpagerAdapter(
Activity activity,
String[] imageUrls,
boolean isLooper, /** 是否进行无限循环 */
getItemViewListener getItemViewListener)
{
this.isLooper = isLooper;
this.images = imageUrls.length;
this.layoutInflater = activity.getLayoutInflater();
this.imageUrls = imageUrls;
views = new View[images];
this.getItemViewListener = getItemViewListener;
} @Override
public int getCount() {
if(isLooper){
if(images<3){ /** 1~2 张图片的情况 强制不开启循环 */
return images;
}else {
return 65535; /** 设置足够大 2^32 */
}
}else{
return images;
}
} /** 调用顺序 destroyItem -> instantiateItem */ @Override
public void destroyItem(ViewGroup container, int position, Object object) {
Log.d("zzzzz","destroy "+position);
container.removeView((View) object); /** 和 instantiateItem 相照应，这个是移除,不用担心内存会累加 */
} @Override
public Object instantiateItem(ViewGroup container,int position) {
Log.d("zzzzz", "position " + position);
if(isLooper && images==3){
/** 3张的特殊处理，在先右滑了一定张数后，再左滑，此时初始化的 距离当前位置 的第前2张和后面一张会重复 (x-2) == (x+1) */
View view = getItemViewListener.getItemView(layoutInflater, container, imageUrls[position%images], position);
container.addView(view);
return view;
}else {
if (position < images) {
if (views[position] == null) {
views[position] = getItemViewListener.getItemView(layoutInflater, container, imageUrls[position], position);
}
} else if (position == images && isLooper) { /** 解决由 setCurrentItem 引发的问题 */
/** 时间复杂度不高，每经过一次，进入一次 */
/** 如果看大图vp 从临界最大值点击进来，此时没有之前的 view 赋值，直接 view[max-1] 会造成 空指针 exception,这是会初始化的有 max-2,max,max-1 */
/*if(images>2){ // 最小情况的判断，因为此时的 container 还没有移除下标 0 的图片,再添加的话会造成不能重复添加的异常
views[0] = getItemViewListener.getItemView(layoutInflater,container,imageUrls[0],0);
}else{ // 刚好是 2 张，手动移除下标 0 }*/
/** 如果 共4张图，此时 positon = 3 setCurrentItem() 就会造成加载了 4-2,4,4-1，4 在 view[] 是越界状态，故需要手动赋值 0，2和3 也初始化了，但是 1 没
* 若一直右滑，到 下标 1 便会抛 Cannot add a null child view to a ViewGroup，所以要 加上 views[images - 3] 也初始化
* */
views[0] = getItemViewListener.getItemView(layoutInflater, container, imageUrls[0], 0);
views[images - 3] = getItemViewListener.getItemView(layoutInflater, container, imageUrls[images - 3], 0);
container.addView(views[0]); /** add 0 不会有问题， */
return views[0];
}
} container.addView(views[position%images]);
return views[position%images];
} @Override
public boolean isViewFromObject(View view, Object o){
return view.equals(o);
} public interface getItemViewListener{
View getItemView(LayoutInflater layoutInflater,ViewGroup container,final String url,final int position);
} }

package cn.share.bananacloud.coustomViews.coustomEdittextInput.MyViewPager; import android.app.Activity;
import android.app.AlertDialog;
import android.graphics.Bitmap;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView; import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener; import cn.share.bananacloud.R;
import cn.share.bananacloud.common.commonDataHelper;
import cn.share.bananacloud.coustomViews.coustomEdittextInput.zoomImageView.PhotoView;
import cn.share.bananacloud.tools.imageLoderHelper; /**
* Created by 林冠宏 on 2016/4/9.
*
* viewPager 无限滑动 + 点击看大图，仍可滑动 + 当前张号页码
*
*/ public class MyViewPager { private Activity activity;
private String[] imageUrls;
protected ImageLoader imageLoder = null;
private ViewPager viewPager;
private int limitTemp = 0; /** 临界中间值 */
private int picnum;
private boolean unClickLooper = false;
private boolean ClickLooper = false; public MyViewPager(
Activity activity,
ViewPager viewPager,
ImageLoader imageLoder,
String[] imageUrls
){
this.activity = activity;
this.imageUrls = imageUrls;
this.imageLoder = imageLoder;
this.viewPager = viewPager;
picnum = imageUrls.length;
} public MyViewPager setUnClickLooper(boolean unClickLooper){
this.unClickLooper = unClickLooper;
return this;
} public MyViewPager setClickLooper(boolean ClickLooper){
this.ClickLooper = ClickLooper;
return this;
} public void init(){
viewPager.setAdapter
(
new LoopViewpagerAdapter
(
activity,
imageUrls,
unClickLooper,
new LoopViewpagerAdapter.getItemViewListener() {
@Override
public View getItemView(LayoutInflater layoutInflater, ViewGroup container, final String url, final int position) {
View view = layoutInflater.inflate(R.layout.cy_item_main_image, container, false);
ImageView imageView = (ImageView) view.findViewById(R.id.image);
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int temp = position%picnum; /** 记得取余数 position 在无限循环的模式不是 0 ~ picnum */
if(temp==0 && position!=0){
showVPimage(picnum-1);
}else{
showVPimage(temp);
} }
});
final ProgressBar spinner = (ProgressBar) view.findViewById(R.id.loading); imageLoder.displayImage(url, imageView,
imageLoderHelper.getLoderOption(commonDataHelper.phoneWidth, R.drawable.hot_live_default_image, 0), new SimpleImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
spinner.setVisibility(View.VISIBLE);
Log.d("zzzzz", "onLoadingStarted");
} @Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
spinner.setVisibility(View.GONE);
} @Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
Log.d("zzzzz", "onLoadingComplete "+imageUri);
spinner.setVisibility(View.GONE);
}
});
return view;
}
}
)
); viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) { } @Override
public void onPageSelected(int i) { /** 先于 instantiateItem 执行 */
TextView nowCount = (TextView) activity.findViewById(R.id.nowCount);
if((i+1)%picnum==0){
nowCount.setText("" + picnum + " /");
}else {
nowCount.setText("" + (i + 1) % picnum + " /");
}
} @Override
public void onPageScrollStateChanged(int i) { }
});
} private void showVPimage(int positon) {
final AlertDialog dlg = new AlertDialog.Builder(activity).create(); View localView = LayoutInflater.from(activity).inflate(R.layout.viewpager, null); localView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
dlg.dismiss();
return false;
}
}); ViewPager viewPager = (ViewPager) localView.findViewById(R.id.imageContainer);
final LinearLayout pointContainer = (LinearLayout) localView.findViewById(R.id.pointContainer);
for(int i=0;i<picnum;i++){
ImageView imageView = (ImageView) LayoutInflater.from(activity).inflate(R.layout.viewpager_point,pointContainer,false);
pointContainer.addView(imageView);
}
viewPager.setAdapter
(
new LoopViewpagerAdapter
(
activity,
imageUrls,
ClickLooper,
new LoopViewpagerAdapter.getItemViewListener() {
@Override
public View getItemView(LayoutInflater layoutInflater, ViewGroup container, String url, int position) {
View view = layoutInflater.inflate(R.layout.show_big_pic, container, false);
PhotoView imageView = (PhotoView) view.findViewById(R.id.bigImage);
imageView.setdimissDialog(new PhotoView.dimissDialog() {
@Override
public void doDimissDialog() {
dlg.dismiss();
}
});
try {
imageLoder.displayImage
(
url,
imageView,
imageLoderHelper.getLoderOption(commonDataHelper.phoneWidth+50, R.drawable.hot_live_default_image,0)
);
} catch (Exception ignored){}
return view;
}
}
)
);
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) { } @Override
public void onPageSelected(int i) { /** 先于 instantiateItem 执行 */
Log.d("onPageSelected","onPageSelected ->"+i);
/** 为了减少 CPU 和 内存的 绘图消耗，这里不采用 for 等循环的方式改 点背景，改用条件语句 */
if(ClickLooper){
Log.d("onPageSelected","i is ->"+i +" limitTemp is "+limitTemp);
/** 循环情况临界点的颜色恢复 */
if((i % picnum)==(picnum-1) && limitTemp == 0){ /** 左滑 */
((ImageView) pointContainer.getChildAt(0)).setImageResource(R.drawable.white_point_xml);
}else {
if (i >= picnum && i % picnum == 0) { /** 右滑 */
((ImageView) pointContainer.getChildAt(picnum - 1)).setImageResource(R.drawable.white_point_xml);
}
}
}
i = i % picnum;
((ImageView) pointContainer.getChildAt(i)).setImageResource(R.drawable.color_point);
if (i != 0 && i != picnum - 1) { /** 非临界值，两边都要修改 */
((ImageView) pointContainer.getChildAt(i>limitTemp ? i-1:i+1)).setImageResource(R.drawable.white_point_xml);
}else {
((ImageView) pointContainer.getChildAt(i==picnum-1 ? i-1:i+1)).setImageResource(R.drawable.white_point_xml);
}
limitTemp = i;
} @Override
public void onPageScrollStateChanged(int i) { }
});
viewPager.setCurrentItem(positon);
((ImageView)pointContainer.getChildAt(positon)).setImageResource(R.drawable.color_point); Window localWindow = dlg.getWindow();
localWindow.getAttributes();
dlg.show();
localWindow.setContentView(localView);
localWindow.setGravity(17);
localWindow.setLayout(-1, -1);
} }