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      */
newInstance(String imageUrl)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      */
ImageDetailFragment()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
onCreate(Bundle savedInstanceState)69     public void onCreate(Bundle savedInstanceState) {
70         super.onCreate(savedInstanceState);
71         mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null;
72     }
73 
74     @Override
onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)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
onActivityCreated(Bundle savedInstanceState)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
onDestroy()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
onImageLoaded(boolean success)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