PhotoPagerAdapter.java

package com.ody.photopicker.adapter;

import android.app.Activity;
import android.content.Context;
import android.net.Uri;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.ody.photopicker.PhotoPicker;
import com.ody.photopicker.R;
import com.ody.photopicker.utils.AndroidLifecycleUtils;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Samuel on 15/6/21.
 */
public class PhotoPagerAdapter extends PagerAdapter {

    private List<String> paths = new ArrayList<>();

    public PhotoPagerAdapter(List<String> paths) {
        this.paths = paths;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        final Context context = container.getContext();
        View itemView = LayoutInflater.from(context)
                .inflate(R.layout.__picker_picker_item_pager, container, false);

        final ImageView imageView = (ImageView) itemView.findViewById(R.id.iv_pager);

        final String path = paths.get(position);
        final Uri uri;
        if (path.startsWith("http")) {
            uri = Uri.parse(path);
        } else {
            uri = Uri.fromFile(new File(path));
        }

        boolean canLoadImage = AndroidLifecycleUtils.canLoadImage(context);

        if (canLoadImage) {
            if (PhotoPicker.mImageLoader == null) throw new RuntimeException("请先设置图片加载器");
            PhotoPicker.mImageLoader.displayImage(imageView, uri);
//      Glide
//              .with(context).load(path)
//              .thumbnail(0.1f)
//              .dontAnimate()
//              .dontTransform()
//              .override(800, 800)
//              .placeholder(R.drawable.__picker_ic_photo_black_48dp)
//              .error(R.drawable.__picker_ic_broken_image_black_48dp)
//              .into(imageView);
        }

        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (context instanceof Activity) {
                    if (!((Activity) context).isFinishing()) {
                        ((Activity) context).onBackPressed();
                    }
                }
            }
        });

        container.addView(itemView);

        return itemView;
    }


    @Override
    public int getCount() {
        return paths.size();
    }


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


    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
        if (PhotoPicker.mImageLoader == null) throw new RuntimeException("请先设置图片加载器");
        PhotoPicker.mImageLoader.clear((View) object);
    }

    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }

}