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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.supportv7.graphics;
     18 
     19 import com.example.android.supportv7.R;
     20 
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.database.Cursor;
     24 import android.graphics.Bitmap;
     25 import android.net.Uri;
     26 import android.os.Bundle;
     27 import android.provider.MediaStore;
     28 import android.support.v4.app.ListFragment;
     29 import android.support.v4.app.LoaderManager;
     30 import android.support.v4.content.CursorLoader;
     31 import android.support.v4.content.Loader;
     32 import android.support.v4.widget.ResourceCursorAdapter;
     33 import android.support.v7.app.ActionBarActivity;
     34 import android.support.v7.graphics.Palette;
     35 import android.view.Menu;
     36 import android.view.MenuInflater;
     37 import android.view.MenuItem;
     38 import android.view.View;
     39 import android.widget.ImageView;
     40 import android.widget.ListView;
     41 
     42 /**
     43  * Activity which displays the images from the device's {@link MediaStore}, alongside the generated
     44  * {@link android.support.v7.graphics.Palette} results.
     45  *
     46  * Allows the customization of the number of colors used in the palette generation, to demonstrate
     47  * the difference in results for different types of images.
     48  */
     49 public class PaletteActivity extends ActionBarActivity {
     50 
     51     @Override
     52     protected void onCreate(Bundle savedInstanceState) {
     53         super.onCreate(savedInstanceState);
     54 
     55         getSupportFragmentManager()
     56                 .beginTransaction()
     57                 .replace(android.R.id.content, new PaletteMediaStoreListFragment())
     58                 .commit();
     59     }
     60 
     61     /**
     62      * The {@link android.support.v4.app.ListFragment} which does all of the hard work.
     63      */
     64     public static class PaletteMediaStoreListFragment extends ListFragment
     65             implements LoaderManager.LoaderCallbacks<Cursor> {
     66 
     67         /**
     68          * Projection used for querying the {@link android.provider.MediaStore}.
     69          */
     70         static final String[] PROJECTION = {
     71                 MediaStore.Images.ImageColumns._ID,
     72                 MediaStore.Images.ImageColumns.DATE_ADDED
     73         };
     74 
     75         private PhotosCursorAdapter mAdapter;
     76 
     77         @Override
     78         public void onCreate(Bundle savedInstanceState) {
     79             super.onCreate(savedInstanceState);
     80             setHasOptionsMenu(true);
     81         }
     82 
     83         @Override
     84         public void onViewCreated(View view, Bundle savedInstanceState) {
     85             super.onViewCreated(view, savedInstanceState);
     86 
     87             // Enable fast scroll to make it easier to navigate large number of images
     88             getListView().setFastScrollEnabled(true);
     89         }
     90 
     91         @Override
     92         public void onActivityCreated(Bundle savedInstanceState) {
     93             super.onActivityCreated(savedInstanceState);
     94 
     95             // Create an Adapter and use a new Adapter
     96             mAdapter = new PhotosCursorAdapter(getActivity(), null);
     97             mAdapter.setNumColors(16);
     98             setListAdapter(mAdapter);
     99 
    100             // Start the loader manager to create our CursorLoader
    101             getLoaderManager().initLoader(0, null, this);
    102         }
    103 
    104         @Override
    105         public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    106             inflater.inflate(R.menu.sample_palette_actions, menu);
    107         }
    108 
    109         @Override
    110         public boolean onOptionsItemSelected(MenuItem item) {
    111             switch (item.getItemId()) {
    112                 case R.id.menu_num_colors_8:
    113                     mAdapter.setNumColors(8);
    114                     item.setChecked(true);
    115                     return true;
    116                 case R.id.menu_num_colors_12:
    117                     mAdapter.setNumColors(12);
    118                     item.setChecked(true);
    119                     return true;
    120                 case R.id.menu_num_colors_16:
    121                     mAdapter.setNumColors(16);
    122                     item.setChecked(true);
    123                     return true;
    124                 case R.id.menu_num_colors_24:
    125                     mAdapter.setNumColors(24);
    126                     item.setChecked(true);
    127                     return true;
    128                 case R.id.menu_num_colors_32:
    129                     mAdapter.setNumColors(32);
    130                     item.setChecked(true);
    131                     return true;
    132             }
    133 
    134             return super.onOptionsItemSelected(item);
    135         }
    136 
    137         @Override
    138         public void onListItemClick(ListView l, View v, int position, long id) {
    139             final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI.buildUpon()
    140                     .appendEncodedPath(String.valueOf(id)).build();
    141 
    142             // Start the Detail Activity
    143             Intent intent = new Intent(getActivity(), PaletteDetailActivity.class);
    144             intent.setData(uri);
    145             startActivity(intent);
    146         }
    147 
    148         @Override
    149         public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
    150             return new CursorLoader(
    151                     getActivity(),
    152                     MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
    153                     PROJECTION,
    154                     null,
    155                     null,
    156                     MediaStore.Images.ImageColumns.DATE_ADDED + " DESC");
    157         }
    158 
    159         @Override
    160         public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
    161             mAdapter.swapCursor(cursor);
    162         }
    163 
    164         @Override
    165         public void onLoaderReset(Loader<Cursor> cursorLoader) {
    166             mAdapter.swapCursor(null);
    167         }
    168 
    169         private static class PhotosCursorAdapter extends ResourceCursorAdapter {
    170 
    171             private int mNumColors;
    172 
    173             public PhotosCursorAdapter(Context context, Cursor c) {
    174                 super(context, R.layout.palette_list_item, c, false);
    175                 mContext = context;
    176             }
    177 
    178             /**
    179              * Set the number of colors used for {@link Palette} generation.
    180              */
    181             void setNumColors(int numColors) {
    182                 mNumColors = numColors;
    183                 notifyDataSetChanged();
    184             }
    185 
    186             @Override
    187             public void bindView(final View view, Context context, Cursor cursor) {
    188                 // Let's reset the view, clearing the ImageView and resetting the background colors
    189                 // of the Palette UI
    190                 ImageView imageView = (ImageView) view.findViewById(R.id.image);
    191                 imageView.setImageDrawable(null);
    192 
    193                 view.findViewById(R.id.text_vibrant).setBackgroundDrawable(null);
    194                 view.findViewById(R.id.text_muted).setBackgroundDrawable(null);
    195                 view.findViewById(R.id.text_light_vibrant).setBackgroundDrawable(null);
    196                 view.findViewById(R.id.text_light_muted).setBackgroundDrawable(null);
    197                 view.findViewById(R.id.text_dark_vibrant).setBackgroundDrawable(null);
    198                 view.findViewById(R.id.text_dark_muted).setBackgroundDrawable(null);
    199 
    200                 final long id = cursor.getLong(
    201                         cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns._ID));
    202 
    203                 ImageLoader.loadMediaStoreThumbnail(imageView, id, new ImageLoader.Listener() {
    204                     @Override
    205                     public void onImageLoaded(Bitmap bitmap) {
    206                         Palette.generateAsync(bitmap, mNumColors,
    207                                 new Palette.PaletteAsyncListener() {
    208                                     @Override
    209                                     public void onGenerated(Palette palette) {
    210                                         setBackgroundColor(
    211                                                 view.findViewById(R.id.text_vibrant),
    212                                                 palette.getVibrantSwatch());
    213                                         setBackgroundColor(
    214                                                 view.findViewById(R.id.text_muted),
    215                                                 palette.getMutedSwatch());
    216                                         setBackgroundColor(
    217                                                 view.findViewById(R.id.text_light_vibrant),
    218                                                 palette.getLightVibrantSwatch());
    219                                         setBackgroundColor(
    220                                                 view.findViewById(R.id.text_light_muted),
    221                                                 palette.getLightMutedSwatch());
    222                                         setBackgroundColor(
    223                                                 view.findViewById(R.id.text_dark_vibrant),
    224                                                 palette.getDarkVibrantSwatch());
    225                                         setBackgroundColor(
    226                                                 view.findViewById(R.id.text_dark_muted),
    227                                                 palette.getDarkMutedSwatch());
    228                                     }
    229                                 });
    230                     }
    231                 });
    232             }
    233         }
    234 
    235         static void setBackgroundColor(View view, Palette.Swatch swatch) {
    236             if (view != null && swatch != null) {
    237                 view.setBackgroundColor(swatch.getRgb());
    238             }
    239         }
    240 
    241     }
    242 
    243 }