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.content.Intent; 23 import android.os.Bundle; 24 import android.support.v4.app.ActivityCompat; 25 import android.support.v4.app.ActivityOptionsCompat; 26 import android.support.v4.util.Pair; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.widget.AdapterView; 30 import android.widget.BaseAdapter; 31 import android.widget.GridView; 32 import android.widget.ImageView; 33 import android.widget.TextView; 34 35 /** 36 * Our main Activity in this sample. Displays a grid of items which an image and title. When the 37 * user clicks on an item, {@link DetailActivity} is launched, using the Activity Scene Transitions 38 * framework to animatedly do so. 39 */ 40 public class MainActivity extends Activity implements AdapterView.OnItemClickListener { 41 42 private GridView mGridView; 43 private GridAdapter mAdapter; 44 45 @Override onCreate(Bundle savedInstanceState)46 public void onCreate(Bundle savedInstanceState) { 47 super.onCreate(savedInstanceState); 48 setContentView(R.layout.grid); 49 50 // Setup the GridView and set the adapter 51 mGridView = (GridView) findViewById(R.id.grid); 52 mGridView.setOnItemClickListener(this); 53 mAdapter = new GridAdapter(); 54 mGridView.setAdapter(mAdapter); 55 } 56 57 /** 58 * Called when an item in the {@link android.widget.GridView} is clicked. Here will launch the 59 * {@link DetailActivity}, using the Scene Transition animation functionality. 60 */ 61 @Override onItemClick(AdapterView<?> adapterView, View view, int position, long id)62 public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { 63 Item item = (Item) adapterView.getItemAtPosition(position); 64 65 // Construct an Intent as normal 66 Intent intent = new Intent(this, DetailActivity.class); 67 intent.putExtra(DetailActivity.EXTRA_PARAM_ID, item.getId()); 68 69 // BEGIN_INCLUDE(start_activity) 70 /** 71 * Now create an {@link android.app.ActivityOptions} instance using the 72 * {@link ActivityOptionsCompat#makeSceneTransitionAnimation(Activity, Pair[])} factory 73 * method. 74 */ 75 ActivityOptionsCompat activityOptions = ActivityOptionsCompat.makeSceneTransitionAnimation( 76 this, 77 78 // Now we provide a list of Pair items which contain the view we can transitioning 79 // from, and the name of the view it is transitioning to, in the launched activity 80 new Pair<View, String>(view.findViewById(R.id.imageview_item), 81 DetailActivity.VIEW_NAME_HEADER_IMAGE), 82 new Pair<View, String>(view.findViewById(R.id.textview_name), 83 DetailActivity.VIEW_NAME_HEADER_TITLE)); 84 85 // Now we can start the Activity, providing the activity options as a bundle 86 ActivityCompat.startActivity(this, intent, activityOptions.toBundle()); 87 // END_INCLUDE(start_activity) 88 } 89 90 /** 91 * {@link android.widget.BaseAdapter} which displays items. 92 */ 93 private class GridAdapter extends BaseAdapter { 94 95 @Override getCount()96 public int getCount() { 97 return Item.ITEMS.length; 98 } 99 100 @Override getItem(int position)101 public Item getItem(int position) { 102 return Item.ITEMS[position]; 103 } 104 105 @Override getItemId(int position)106 public long getItemId(int position) { 107 return getItem(position).getId(); 108 } 109 110 @Override getView(int position, View view, ViewGroup viewGroup)111 public View getView(int position, View view, ViewGroup viewGroup) { 112 if (view == null) { 113 view = getLayoutInflater().inflate(R.layout.grid_item, viewGroup, false); 114 } 115 116 final Item item = getItem(position); 117 118 // Load the thumbnail image 119 ImageView image = (ImageView) view.findViewById(R.id.imageview_item); 120 Picasso.with(image.getContext()).load(item.getThumbnailUrl()).into(image); 121 122 // Set the TextView's contents 123 TextView name = (TextView) view.findViewById(R.id.textview_name); 124 name.setText(item.getName()); 125 126 return view; 127 } 128 } 129 } 130