1 /* 2 * Copyright (C) 2014 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.activityscenetransitionbasic; 18 19 import com.android.volley.toolbox.ImageLoader; 20 import com.android.volley.toolbox.NetworkImageView; 21 import com.android.volley.toolbox.Volley; 22 23 import android.app.Activity; 24 import android.graphics.Bitmap; 25 import android.os.Bundle; 26 import android.widget.TextView; 27 28 /** 29 * Our secondary Activity which is launched from {@link MainActivity}. Has a simple detail UI 30 * which has a large banner image, title and body text. 31 */ 32 public class DetailActivity extends Activity { 33 34 // Extra name for the ID parameter 35 public static final String EXTRA_PARAM_ID = "detail:_id"; 36 37 // View name of the header image. Used for activity scene transitions 38 public static final String VIEW_NAME_HEADER_IMAGE = "detail:header:image"; 39 40 // View name of the header title. Used for activity scene transitions 41 public static final String VIEW_NAME_HEADER_TITLE = "detail:header:title"; 42 43 private NetworkImageView mHeaderImageView; 44 private TextView mHeaderTitle; 45 46 private ImageLoader mImageLoader; 47 48 @Override onCreate(Bundle savedInstanceState)49 protected void onCreate(Bundle savedInstanceState) { 50 super.onCreate(savedInstanceState); 51 setContentView(R.layout.details); 52 53 // Construct an ImageLoader instance so that we can load images from the network 54 mImageLoader = new ImageLoader(Volley.newRequestQueue(this), ImageMemoryCache.INSTANCE); 55 56 // Retrieve the correct Item instance, using the ID provided in the Intent 57 Item item = Item.getItem(getIntent().getIntExtra(EXTRA_PARAM_ID, 0)); 58 59 mHeaderImageView = (NetworkImageView) findViewById(R.id.imageview_header); 60 mHeaderTitle = (TextView) findViewById(R.id.textview_title); 61 62 // BEGIN_INCLUDE(detail_set_view_name) 63 /** 64 * Set the name of the view's which will be transition to, using the static values above. 65 * This could be done in the layout XML, but exposing it via static variables allows easy 66 * querying from other Activities 67 */ 68 mHeaderImageView.setViewName(VIEW_NAME_HEADER_IMAGE); 69 mHeaderTitle.setViewName(VIEW_NAME_HEADER_TITLE); 70 // END_INCLUDE(detail_set_view_name) 71 72 loadItem(item); 73 } 74 loadItem(Item item)75 private void loadItem(Item item) { 76 // Set the title TextView to the item's name and author 77 mHeaderTitle.setText(getString(R.string.image_header, item.getName(), item.getAuthor())); 78 79 final ImageMemoryCache cache = ImageMemoryCache.INSTANCE; 80 Bitmap thumbnailImage = cache.getBitmapFromUrl(item.getThumbnailUrl()); 81 82 // Check to see if we already have the thumbnail sized image in the cache. If so, start 83 // loading the full size image and display the thumbnail as a placeholder. 84 if (thumbnailImage != null) { 85 mHeaderImageView.setImageUrl(item.getPhotoUrl(), mImageLoader); 86 mHeaderImageView.setImageBitmap(thumbnailImage); 87 return; 88 } 89 90 // If we get here then we do not have either the full size or the thumbnail in the cache. 91 // Here we just load the full size and make do. 92 mHeaderImageView.setImageUrl(item.getPhotoUrl(), mImageLoader); 93 } 94 95 } 96