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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 import android.widget.ProgressBar;
     27 
     28 import com.example.android.displayingbitmaps.R;
     29 import com.example.android.displayingbitmaps.util.ImageFetcher;
     30 import com.example.android.displayingbitmaps.util.ImageWorker;
     31 import com.example.android.displayingbitmaps.util.Utils;
     32 
     33 /**
     34  * This fragment will populate the children of the ViewPager from {@link ImageDetailActivity}.
     35  */
     36 public class ImageDetailFragment extends Fragment implements ImageWorker.OnImageLoadedListener {
     37     private static final String IMAGE_DATA_EXTRA = "extra_image_data";
     38     private String mImageUrl;
     39     private ImageView mImageView;
     40     private ProgressBar mProgressBar;
     41     private ImageFetcher mImageFetcher;
     42 
     43     /**
     44      * Factory method to generate a new instance of the fragment given an image number.
     45      *
     46      * @param imageUrl The image url to load
     47      * @return A new instance of ImageDetailFragment with imageNum extras
     48      */
     49     public static ImageDetailFragment newInstance(String imageUrl) {
     50         final ImageDetailFragment f = new ImageDetailFragment();
     51 
     52         final Bundle args = new Bundle();
     53         args.putString(IMAGE_DATA_EXTRA, imageUrl);
     54         f.setArguments(args);
     55 
     56         return f;
     57     }
     58 
     59     /**
     60      * Empty constructor as per the Fragment documentation
     61      */
     62     public ImageDetailFragment() {}
     63 
     64     /**
     65      * Populate image using a url from extras, use the convenience factory method
     66      * {@link ImageDetailFragment#newInstance(String)} to create this fragment.
     67      */
     68     @Override
     69     public void onCreate(Bundle savedInstanceState) {
     70         super.onCreate(savedInstanceState);
     71         mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null;
     72     }
     73 
     74     @Override
     75     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     76             Bundle savedInstanceState) {
     77         // Inflate and locate the main ImageView
     78         final View v = inflater.inflate(R.layout.image_detail_fragment, container, false);
     79         mImageView = (ImageView) v.findViewById(R.id.imageView);
     80         mProgressBar = (ProgressBar) v.findViewById(R.id.progressbar);
     81         return v;
     82     }
     83 
     84     @Override
     85     public void onActivityCreated(Bundle savedInstanceState) {
     86         super.onActivityCreated(savedInstanceState);
     87 
     88         // Use the parent activity to load the image asynchronously into the ImageView (so a single
     89         // cache can be used over all pages in the ViewPager
     90         if (ImageDetailActivity.class.isInstance(getActivity())) {
     91             mImageFetcher = ((ImageDetailActivity) getActivity()).getImageFetcher();
     92             mImageFetcher.loadImage(mImageUrl, mImageView, this);
     93         }
     94 
     95         // Pass clicks on the ImageView to the parent activity to handle
     96         if (OnClickListener.class.isInstance(getActivity()) && Utils.hasHoneycomb()) {
     97             mImageView.setOnClickListener((OnClickListener) getActivity());
     98         }
     99     }
    100 
    101     @Override
    102     public void onDestroy() {
    103         super.onDestroy();
    104         if (mImageView != null) {
    105             // Cancel any pending image work
    106             ImageWorker.cancelWork(mImageView);
    107             mImageView.setImageDrawable(null);
    108         }
    109     }
    110 
    111     @Override
    112     public void onImageLoaded(boolean success) {
    113         // Set loading spinner to gone once image has loaded. Cloud also show
    114         // an error view here if needed.
    115         mProgressBar.setVisibility(View.GONE);
    116     }
    117 }
    118