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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.displayingbitmaps.ui;
     18 
     19 import android.os.Bundle;
     20 import android.support.v4.app.Fragment;
     21 import android.view.LayoutInflater;
     22 import android.view.View;
     23 import android.view.View.OnClickListener;
     24 import android.view.ViewGroup;
     25 import android.widget.ImageView;
     26 
     27 import com.example.android.displayingbitmaps.R;
     28 import com.example.android.displayingbitmaps.util.ImageFetcher;
     29 import com.example.android.displayingbitmaps.util.ImageWorker;
     30 import com.example.android.displayingbitmaps.util.Utils;
     31 
     32 /**
     33  * This fragment will populate the children of the ViewPager from {@link ImageDetailActivity}.
     34  */
     35 public class ImageDetailFragment extends Fragment {
     36     private static final String IMAGE_DATA_EXTRA = "extra_image_data";
     37     private String mImageUrl;
     38     private ImageView mImageView;
     39     private ImageFetcher mImageFetcher;
     40 
     41     /**
     42      * Factory method to generate a new instance of the fragment given an image number.
     43      *
     44      * @param imageUrl The image url to load
     45      * @return A new instance of ImageDetailFragment with imageNum extras
     46      */
     47     public static ImageDetailFragment newInstance(String imageUrl) {
     48         final ImageDetailFragment f = new ImageDetailFragment();
     49 
     50         final Bundle args = new Bundle();
     51         args.putString(IMAGE_DATA_EXTRA, imageUrl);
     52         f.setArguments(args);
     53 
     54         return f;
     55     }
     56 
     57     /**
     58      * Empty constructor as per the Fragment documentation
     59      */
     60     public ImageDetailFragment() {}
     61 
     62     /**
     63      * Populate image using a url from extras, use the convenience factory method
     64      * {@link ImageDetailFragment#newInstance(String)} to create this fragment.
     65      */
     66     @Override
     67     public void onCreate(Bundle savedInstanceState) {
     68         super.onCreate(savedInstanceState);
     69         mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null;
     70     }
     71 
     72     @Override
     73     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     74             Bundle savedInstanceState) {
     75         // Inflate and locate the main ImageView
     76         final View v = inflater.inflate(R.layout.image_detail_fragment, container, false);
     77         mImageView = (ImageView) v.findViewById(R.id.imageView);
     78         return v;
     79     }
     80 
     81     @Override
     82     public void onActivityCreated(Bundle savedInstanceState) {
     83         super.onActivityCreated(savedInstanceState);
     84 
     85         // Use the parent activity to load the image asynchronously into the ImageView (so a single
     86         // cache can be used over all pages in the ViewPager
     87         if (ImageDetailActivity.class.isInstance(getActivity())) {
     88             mImageFetcher = ((ImageDetailActivity) getActivity()).getImageFetcher();
     89             mImageFetcher.loadImage(mImageUrl, mImageView);
     90         }
     91 
     92         // Pass clicks on the ImageView to the parent activity to handle
     93         if (OnClickListener.class.isInstance(getActivity()) && Utils.hasHoneycomb()) {
     94             mImageView.setOnClickListener((OnClickListener) getActivity());
     95         }
     96     }
     97 
     98     @Override
     99     public void onDestroy() {
    100         super.onDestroy();
    101         if (mImageView != null) {
    102             // Cancel any pending image work
    103             ImageWorker.cancelWork(mImageView);
    104             mImageView.setImageDrawable(null);
    105         }
    106     }
    107 }
    108