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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 android.content.Context;
     20 import android.content.Intent;
     21 import android.database.Cursor;
     22 import android.graphics.Bitmap;
     23 import android.net.Uri;
     24 import android.os.Bundle;
     25 import android.provider.MediaStore;
     26 import android.support.v4.app.ListFragment;
     27 import android.support.v4.app.LoaderManager;
     28 import android.support.v4.content.CursorLoader;
     29 import android.support.v4.content.Loader;
     30 import android.support.v4.view.ViewCompat;
     31 import android.support.v4.widget.ResourceCursorAdapter;
     32 import android.support.v7.app.AppCompatActivity;
     33 import android.support.v7.graphics.Palette;
     34 import android.view.Menu;
     35 import android.view.MenuInflater;
     36 import android.view.MenuItem;
     37 import android.view.View;
     38 import android.widget.ImageView;
     39 import android.widget.ListView;
     40 
     41 import com.example.android.supportv7.R;
     42 
     43 /**
     44  * Activity which displays the images from the device's {@link MediaStore}, alongside the generated
     45  * {@link android.support.v7.graphics.Palette} results.
     46  *
     47  * Allows the customization of the number of colors used in the palette generation, to demonstrate
     48  * the difference in results for different types of images.
     49  */
     50 public class PaletteActivity extends AppCompatActivity {
     51 
     52     @Override
     53     protected void onCreate(Bundle savedInstanceState) {
     54         super.onCreate(savedInstanceState);
     55 
     56         getSupportFragmentManager()
     57                 .beginTransaction()
     58                 .replace(android.R.id.content, new PaletteMediaStoreListFragment())
     59                 .commit();
     60     }
     61 
     62     /**
     63      * The {@link android.support.v4.app.ListFragment} which does all of the hard work.
     64      */
     65     public static class PaletteMediaStoreListFragment extends ListFragment
     66             implements LoaderManager.LoaderCallbacks<Cursor> {
     67 
     68         /**
     69          * Projection used for querying the {@link android.provider.MediaStore}.
     70          */
     71         static final String[] PROJECTION = {
     72                 MediaStore.Images.ImageColumns._ID,
     73                 MediaStore.Images.ImageColumns.DATE_ADDED
     74         };
     75 
     76         private PhotosCursorAdapter mAdapter;
     77 
     78         @Override
     79         public void onCreate(Bundle savedInstanceState) {
     80             super.onCreate(savedInstanceState);
     81             setHasOptionsMenu(true);
     82         }
     83 
     84         @Override
     85         public void onViewCreated(View view, Bundle savedInstanceState) {
     86             super.onViewCreated(view, savedInstanceState);
     87 
     88             // Enable fast scroll to make it easier to navigate large number of images
     89             getListView().setFastScrollEnabled(true);
     90         }
     91 
     92         @Override
     93         public void onActivityCreated(Bundle savedInstanceState) {
     94             super.onActivityCreated(savedInstanceState);
     95 
     96             // Create an Adapter and use a new Adapter
     97             mAdapter = new PhotosCursorAdapter(getActivity(), null);
     98             mAdapter.setNumColors(16);
     99             setListAdapter(mAdapter);
    100 
    101             // Start the loader manager to create our CursorLoader
    102             getLoaderManager().initLoader(0, null, this);
    103         }
    104 
    105         @Override
    106         public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    107             inflater.inflate(R.menu.sample_palette_actions, menu);
    108         }
    109 
    110         @Override
    111         public boolean onOptionsItemSelected(MenuItem item) {
    112             switch (item.getItemId()) {
    113                 case R.id.menu_num_colors_8:
    114                     mAdapter.setNumColors(8);
    115                     item.setChecked(true);
    116                     return true;
    117                 case R.id.menu_num_colors_12:
    118                     mAdapter.setNumColors(12);
    119                     item.setChecked(true);
    120                     return true;
    121                 case R.id.menu_num_colors_16:
    122                     mAdapter.setNumColors(16);
    123                     item.setChecked(true);
    124                     return true;
    125                 case R.id.menu_num_colors_24:
    126                     mAdapter.setNumColors(24);
    127                     item.setChecked(true);
    128                     return true;
    129                 case R.id.menu_num_colors_32:
    130                     mAdapter.setNumColors(32);
    131                     item.setChecked(true);
    132                     return true;
    133             }
    134 
    135             return super.onOptionsItemSelected(item);
    136         }
    137 
    138         @Override
    139         public void onListItemClick(ListView l, View v, int position, long id) {
    140             final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI.buildUpon()
    141                     .appendEncodedPath(String.valueOf(id)).build();
    142 
    143             // Start the Detail Activity
    144             Intent intent = new Intent(getActivity(), PaletteDetailActivity.class);
    145             intent.setData(uri);
    146             startActivity(intent);
    147         }
    148 
    149         @Override
    150         public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
    151             return new CursorLoader(
    152                     getActivity(),
    153                     MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
    154                     PROJECTION,
    155                     null,
    156                     null,
    157                     MediaStore.Images.ImageColumns.DATE_ADDED + " DESC");
    158         }
    159 
    160         @Override
    161         public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
    162             mAdapter.swapCursor(cursor);
    163         }
    164 
    165         @Override
    166         public void onLoaderReset(Loader<Cursor> cursorLoader) {
    167             mAdapter.swapCursor(null);
    168         }
    169 
    170         private static class PhotosCursorAdapter extends ResourceCursorAdapter {
    171 
    172             private int mNumColors;
    173 
    174             public PhotosCursorAdapter(Context context, Cursor c) {
    175                 super(context, R.layout.palette_list_item, c, false);
    176                 mContext = context;
    177             }
    178 
    179             /**
    180              * Set the number of colors used for {@link Palette} generation.
    181              */
    182             void setNumColors(int numColors) {
    183                 mNumColors = numColors;
    184                 notifyDataSetChanged();
    185             }
    186 
    187             @Override
    188             public void bindView(final View view, Context context, Cursor cursor) {
    189                 // Let's reset the view, clearing the ImageView and resetting the background colors
    190                 // of the Palette UI
    191                 ImageView imageView = (ImageView) view.findViewById(R.id.image);
    192                 imageView.setImageDrawable(null);
    193 
    194                 ViewCompat.setBackground(view.findViewById(R.id.text_vibrant), null);
    195                 ViewCompat.setBackground(view.findViewById(R.id.text_muted), null);
    196                 ViewCompat.setBackground(view.findViewById(R.id.text_light_vibrant), null);
    197                 ViewCompat.setBackground(view.findViewById(R.id.text_light_muted), null);
    198                 ViewCompat.setBackground(view.findViewById(R.id.text_dark_vibrant), null);
    199                 ViewCompat.setBackground(view.findViewById(R.id.text_dark_muted), null);
    200 
    201                 final long id = cursor.getLong(
    202                         cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns._ID));
    203 
    204                 ImageLoader.loadMediaStoreThumbnail(imageView, id, new ImageLoader.Listener() {
    205                     @Override
    206                     public void onImageLoaded(Bitmap bitmap) {
    207                         new Palette.Builder(bitmap).maximumColorCount(mNumColors).generate(
    208                                 new Palette.PaletteAsyncListener() {
    209                                     @Override
    210                                     public void onGenerated(Palette palette) {
    211                                         setBackgroundColor(
    212                                                 view.findViewById(R.id.text_vibrant),
    213                                                 palette.getVibrantSwatch());
    214                                         setBackgroundColor(
    215                                                 view.findViewById(R.id.text_muted),
    216                                                 palette.getMutedSwatch());
    217                                         setBackgroundColor(
    218                                                 view.findViewById(R.id.text_light_vibrant),
    219                                                 palette.getLightVibrantSwatch());
    220                                         setBackgroundColor(
    221                                                 view.findViewById(R.id.text_light_muted),
    222                                                 palette.getLightMutedSwatch());
    223                                         setBackgroundColor(
    224                                                 view.findViewById(R.id.text_dark_vibrant),
    225                                                 palette.getDarkVibrantSwatch());
    226                                         setBackgroundColor(
    227                                                 view.findViewById(R.id.text_dark_muted),
    228                                                 palette.getDarkMutedSwatch());
    229                                     }
    230                                 });
    231                     }
    232                 });
    233             }
    234         }
    235 
    236         static void setBackgroundColor(View view, Palette.Swatch swatch) {
    237             if (view != null && swatch != null) {
    238                 view.setBackgroundColor(swatch.getRgb());
    239             }
    240         }
    241 
    242     }
    243 
    244 }