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 */ newInstance(String imageUrl)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 */ ImageDetailFragment()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 onCreate(Bundle savedInstanceState)67 public void onCreate(Bundle savedInstanceState) { 68 super.onCreate(savedInstanceState); 69 mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null; 70 } 71 72 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)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 onActivityCreated(Bundle savedInstanceState)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 onDestroy()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