Alexander Lucas | 97842ff | 2014-03-07 14:56:55 -0800 | [diff] [blame^] | 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 | } |