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ninegridview/src/main/java/com/lzy/ninegrid/preview/ImagePreviewAdapter.java

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+package com.lzy.ninegrid.preview;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.support.annotation.NonNull;
+import android.support.v4.view.PagerAdapter;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.ProgressBar;
+
+import com.lzy.ninegrid.ImageInfo;
+import com.lzy.ninegrid.NineGridView;
+import com.lzy.ninegrid.R;
+
+import java.util.List;
+
+import uk.co.senab.photoview.PhotoView;
+import uk.co.senab.photoview.PhotoViewAttacher;
+
+/**
+ * ================================================
+ * 作    者：廖子尧
+ * 版    本：1.0
+ * 创建日期：2016/3/21
+ * 描    述：
+ * 修订历史：
+ * ================================================
+ */
+public class ImagePreviewAdapter extends PagerAdapter implements PhotoViewAttacher.OnPhotoTapListener {
+
+    private List<ImageInfo> imageInfo;
+    private Context context;
+    private View currentView;
+
+    public ImagePreviewAdapter(Context context, @NonNull List<ImageInfo> imageInfo) {
+        super();
+        this.imageInfo = imageInfo;
+        this.context = context;
+    }
+
+    @Override
+    public int getCount() {
+        return imageInfo.size();
+    }
+
+    @Override
+    public boolean isViewFromObject(View view, Object object) {
+        return view == object;
+    }
+
+    @Override
+    public void setPrimaryItem(ViewGroup container, int position, Object object) {
+        super.setPrimaryItem(container, position, object);
+        currentView = (View) object;
+    }
+
+    public View getPrimaryItem() {
+        return currentView;
+    }
+
+    public ImageView getPrimaryImageView() {
+        return (ImageView) currentView.findViewById(R.id.pv);
+    }
+
+    @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        View view = LayoutInflater.from(context).inflate(R.layout.item_photoview, container, false);
+
+        final ProgressBar pb = (ProgressBar) view.findViewById(R.id.pb);
+        final PhotoView imageView = (PhotoView) view.findViewById(R.id.pv);
+
+        ImageInfo info = this.imageInfo.get(position);
+        imageView.setOnPhotoTapListener(this);
+        showExcessPic(info, imageView);
+
+        //如果需要加载的loading,需要自己改写,不能使用这个方法
+        NineGridView.getImageLoader().onDisplayImage(view.getContext(), imageView, info.bigImageUrl);
+
+//        pb.setVisibility(View.VISIBLE);
+//        Glide.with(context).load(info.bigImageUrl)//
+//                .placeholder(R.drawable.ic_default_image)//
+//                .error(R.drawable.ic_default_image)//
+//                .diskCacheStrategy(DiskCacheStrategy.ALL)//
+//                .listener(new RequestListener<String, GlideDrawable>() {
+//                    @Override
+//                    public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
+//                        pb.setVisibility(View.GONE);
+//                        return false;
+//                    }
+//
+//                    @Override
+//                    public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
+//                        pb.setVisibility(View.GONE);
+//                        return false;
+//                    }
+//                }).into(imageView);
+
+        container.addView(view);
+        return view;
+    }
+
+    /** 展示过度图片 */
+    private void showExcessPic(ImageInfo imageInfo, PhotoView imageView) {
+        //先获取大图的缓存图片
+        Bitmap cacheImage = NineGridView.getImageLoader().getCacheImage(imageInfo.bigImageUrl);
+        //如果大图的缓存不存在,在获取小图的缓存
+        if (cacheImage == null) cacheImage = NineGridView.getImageLoader().getCacheImage(imageInfo.thumbnailUrl);
+        //如果没有任何缓存,使用默认图片,否者使用缓存
+        if (cacheImage == null) {
+            imageView.setImageResource(R.drawable.ic_default_color);
+        } else {
+            imageView.setImageBitmap(cacheImage);
+        }
+    }
+
+    @Override
+    public void destroyItem(ViewGroup container, int position, Object object) {
+        container.removeView((View) object);
+    }
+
+    /** 单击屏幕关闭 */
+    @Override
+    public void onPhotoTap(View view, float x, float y) {
+        ((ImagePreviewActivity) context).finishActivityAnim();
+    }
+}