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      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
     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
     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
     96         public int getCount() {
     97             return Item.ITEMS.length;
     98         }
     99 
    100         @Override
    101         public Item getItem(int position) {
    102             return Item.ITEMS[position];
    103         }
    104 
    105         @Override
    106         public long getItemId(int position) {
    107             return getItem(position).getId();
    108         }
    109 
    110         @Override
    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