ImageAdapter.java

package com.llf.basemodel.image;

import android.app.Activity;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ProgressBar;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.bumptech.glide.load.resource.drawable.GlideDrawable;
import com.bumptech.glide.request.RequestListener;
import com.bumptech.glide.request.target.Target;
import com.llf.basemodel.R;

import java.util.ArrayList;
import java.util.List;

import uk.co.senab.photoview.PhotoView;
import uk.co.senab.photoview.PhotoViewAttacher;

/**
 * Created by llf on 2016/10/20.
 */

public class ImageAdapter extends PagerAdapter {
    private List<String> datas = new ArrayList<>();
    private LayoutInflater inflater;
    private Context context;

    public ImageAdapter(Context context, List<String> datas) {
        this.context = context;
        this.inflater = LayoutInflater.from(context);
        this.datas = datas;
    }

    @Override
    public int getCount() {
        if (datas == null) return 0;
        return datas.size();
    }


    @Override
    public Object instantiateItem(ViewGroup container, final int position) {
        View view = inflater.inflate(R.layout.item_pager_image, container, false);
        if (view != null) {
            final PhotoView imageView = (PhotoView) view.findViewById(R.id.image);
            final ProgressBar loading = new ProgressBar(context);
            FrameLayout.LayoutParams loadingLayoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
            loadingLayoutParams.gravity = Gravity.CENTER;
            loading.setLayoutParams(loadingLayoutParams);
            ((FrameLayout) view).addView(loading);
            final String imgurl = datas.get(position);
            loading.setVisibility(View.VISIBLE);

            Glide.with(context).load(imgurl)
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .error(R.drawable.ic_empty_picture)
                    .thumbnail(0.1f)
                    .listener(new RequestListener<String, GlideDrawable>() {
                        @Override
                        public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                            loading.setVisibility(View.GONE);
                            return false;
                        }

                        @Override
                        public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                            loading.setVisibility(View.GONE);
                            return false;
                        }
                    })
                    .into(imageView);

            imageView.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() {
                @Override
                public void onPhotoTap(View view, float x, float y) {
                    ((Activity) context).finish();
                }
            });

            container.addView(view, 0);
        }
        return view;
    }

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

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view.equals(object);
    }
}