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.squareup.picasso.Picasso; 20 21 import android.app.Activity; 22 import android.os.Build; 23 import android.os.Bundle; 24 import android.support.v4.view.ViewCompat; 25 import android.transition.Transition; 26 import android.widget.ImageView; 27 import android.widget.TextView; 28 29 /** 30 * Our secondary Activity which is launched from {@link MainActivity}. Has a simple detail UI 31 * which has a large banner image, title and body text. 32 */ 33 public class DetailActivity extends Activity { 34 35 // Extra name for the ID parameter 36 public static final String EXTRA_PARAM_ID = "detail:_id"; 37 38 // View name of the header image. Used for activity scene transitions 39 public static final String VIEW_NAME_HEADER_IMAGE = "detail:header:image"; 40 41 // View name of the header title. Used for activity scene transitions 42 public static final String VIEW_NAME_HEADER_TITLE = "detail:header:title"; 43 44 private ImageView mHeaderImageView; 45 private TextView mHeaderTitle; 46 47 private Item mItem; 48 49 @Override 50 protected void onCreate(Bundle savedInstanceState) { 51 super.onCreate(savedInstanceState); 52 setContentView(R.layout.details); 53 54 // Retrieve the correct Item instance, using the ID provided in the Intent 55 mItem = Item.getItem(getIntent().getIntExtra(EXTRA_PARAM_ID, 0)); 56 57 mHeaderImageView = (ImageView) findViewById(R.id.imageview_header); 58 mHeaderTitle = (TextView) findViewById(R.id.textview_title); 59 60 // BEGIN_INCLUDE(detail_set_view_name) 61 /** 62 * Set the name of the view's which will be transition to, using the static values above. 63 * This could be done in the layout XML, but exposing it via static variables allows easy 64 * querying from other Activities 65 */ 66 ViewCompat.setTransitionName(mHeaderImageView, VIEW_NAME_HEADER_IMAGE); 67 ViewCompat.setTransitionName(mHeaderTitle, VIEW_NAME_HEADER_TITLE); 68 // END_INCLUDE(detail_set_view_name) 69 70 loadItem(); 71 } 72 73 private void loadItem() { 74 // Set the title TextView to the item's name and author 75 mHeaderTitle.setText(getString(R.string.image_header, mItem.getName(), mItem.getAuthor())); 76 77 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && addTransitionListener()) { 78 // If we're running on Lollipop and we have added a listener to the shared element 79 // transition, load the thumbnail. The listener will load the full-size image when 80 // the transition is complete. 81 loadThumbnail(); 82 } else { 83 // If all other cases we should just load the full-size image now 84 loadFullSizeImage(); 85 } 86 } 87 88 /** 89 * Load the item's thumbnail image into our {@link ImageView}. 90 */ 91 private void loadThumbnail() { 92 Picasso.with(mHeaderImageView.getContext()) 93 .load(mItem.getThumbnailUrl()) 94 .noFade() 95 .into(mHeaderImageView); 96 } 97 98 /** 99 * Load the item's full-size image into our {@link ImageView}. 100 */ 101 private void loadFullSizeImage() { 102 Picasso.with(mHeaderImageView.getContext()) 103 .load(mItem.getPhotoUrl()) 104 .noFade() 105 .noPlaceholder() 106 .into(mHeaderImageView); 107 } 108 109 /** 110 * Try and add a {@link Transition.TransitionListener} to the entering shared element 111 * {@link Transition}. We do this so that we can load the full-size image after the transition 112 * has completed. 113 * 114 * @return true if we were successful in adding a listener to the enter transition 115 */ 116 private boolean addTransitionListener() { 117 final Transition transition = getWindow().getSharedElementEnterTransition(); 118 119 if (transition != null) { 120 // There is an entering shared element transition so add a listener to it 121 transition.addListener(new Transition.TransitionListener() { 122 @Override 123 public void onTransitionEnd(Transition transition) { 124 // As the transition has ended, we can now load the full-size image 125 loadFullSizeImage(); 126 127 // Make sure we remove ourselves as a listener 128 transition.removeListener(this); 129 } 130 131 @Override 132 public void onTransitionStart(Transition transition) { 133 // No-op 134 } 135 136 @Override 137 public void onTransitionCancel(Transition transition) { 138 // Make sure we remove ourselves as a listener 139 transition.removeListener(this); 140 } 141 142 @Override 143 public void onTransitionPause(Transition transition) { 144 // No-op 145 } 146 147 @Override 148 public void onTransitionResume(Transition transition) { 149 // No-op 150 } 151 }); 152 return true; 153 } 154 155 // If we reach here then we have not added a listener 156 return false; 157 } 158 159 } 160
