/* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.androidx.graphics; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.ImageView; import android.widget.ListView; import androidx.appcompat.app.AppCompatActivity; import androidx.cursoradapter.widget.ResourceCursorAdapter; import androidx.fragment.app.ListFragment; import androidx.loader.app.LoaderManager; import androidx.loader.content.CursorLoader; import androidx.loader.content.Loader; import androidx.palette.graphics.Palette; import com.example.androidx.R; import org.jspecify.annotations.NonNull; /** * Activity which displays the images from the device's {@link MediaStore}, alongside the generated * {@link androidx.palette.graphics.Palette} results. * * Allows the customization of the number of colors used in the palette generation, to demonstrate * the difference in results for different types of images. */ public class PaletteActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getSupportFragmentManager() .beginTransaction() .replace(android.R.id.content, new PaletteMediaStoreListFragment()) .commit(); } /** * The {@link androidx.fragment.app.ListFragment} which does all of the hard work. */ public static class PaletteMediaStoreListFragment extends ListFragment implements LoaderManager.LoaderCallbacks { /** * Projection used for querying the {@link android.provider.MediaStore}. */ static final String[] PROJECTION = { MediaStore.Images.ImageColumns._ID, MediaStore.Images.ImageColumns.DATE_ADDED }; private PhotosCursorAdapter mAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); // Enable fast scroll to make it easier to navigate large number of images getListView().setFastScrollEnabled(true); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Create an Adapter and use a new Adapter mAdapter = new PhotosCursorAdapter(getActivity(), null); mAdapter.setNumColors(16); setListAdapter(mAdapter); // Start the loader manager to create our CursorLoader getLoaderManager().initLoader(0, null, this); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.sample_palette_actions, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { int itemId = item.getItemId(); if (itemId == R.id.menu_num_colors_8) { mAdapter.setNumColors(8); item.setChecked(true); return true; } else if (itemId == R.id.menu_num_colors_12) { mAdapter.setNumColors(12); item.setChecked(true); return true; } else if (itemId == R.id.menu_num_colors_16) { mAdapter.setNumColors(16); item.setChecked(true); return true; } else if (itemId == R.id.menu_num_colors_24) { mAdapter.setNumColors(24); item.setChecked(true); return true; } else if (itemId == R.id.menu_num_colors_32) { mAdapter.setNumColors(32); item.setChecked(true); return true; } return super.onOptionsItemSelected(item); } @Override public void onListItemClick(ListView l, View v, int position, long id) { final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI.buildUpon() .appendEncodedPath(String.valueOf(id)).build(); // Start the Detail Activity Intent intent = new Intent(getActivity(), PaletteDetailActivity.class); intent.setData(uri); startActivity(intent); } @Override public @NonNull Loader onCreateLoader(int id, Bundle bundle) { return new CursorLoader( getActivity(), MediaStore.Images.Media.EXTERNAL_CONTENT_URI, PROJECTION, null, null, MediaStore.Images.ImageColumns.DATE_ADDED + " DESC"); } @Override public void onLoadFinished(@NonNull Loader cursorLoader, Cursor cursor) { mAdapter.swapCursor(cursor); } @Override public void onLoaderReset(@NonNull Loader cursorLoader) { mAdapter.swapCursor(null); } private static class PhotosCursorAdapter extends ResourceCursorAdapter { private int mNumColors; public PhotosCursorAdapter(Context context, Cursor c) { super(context, R.layout.palette_list_item, c, false); } /** * Set the number of colors used for {@link Palette} generation. */ void setNumColors(int numColors) { mNumColors = numColors; notifyDataSetChanged(); } @Override public void bindView(final View view, Context context, Cursor cursor) { // Let's reset the view, clearing the ImageView and resetting the background colors // of the Palette UI ImageView imageView = (ImageView) view.findViewById(R.id.image); imageView.setImageDrawable(null); view.findViewById(R.id.text_vibrant).setBackground(null); view.findViewById(R.id.text_muted).setBackground(null); view.findViewById(R.id.text_light_vibrant).setBackground(null); view.findViewById(R.id.text_light_muted).setBackground(null); view.findViewById(R.id.text_dark_vibrant).setBackground(null); view.findViewById(R.id.text_dark_muted).setBackground(null); final long id = cursor.getLong( cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns._ID)); ImageLoader.loadMediaStoreThumbnail(imageView, id, new ImageLoader.Listener() { @SuppressWarnings("deprecation") @Override public void onImageLoaded(Bitmap bitmap) { new Palette.Builder(bitmap).maximumColorCount(mNumColors).generate( new Palette.PaletteAsyncListener() { @Override public void onGenerated(Palette palette) { setBackgroundColor( view.findViewById(R.id.text_vibrant), palette.getVibrantSwatch()); setBackgroundColor( view.findViewById(R.id.text_muted), palette.getMutedSwatch()); setBackgroundColor( view.findViewById(R.id.text_light_vibrant), palette.getLightVibrantSwatch()); setBackgroundColor( view.findViewById(R.id.text_light_muted), palette.getLightMutedSwatch()); setBackgroundColor( view.findViewById(R.id.text_dark_vibrant), palette.getDarkVibrantSwatch()); setBackgroundColor( view.findViewById(R.id.text_dark_muted), palette.getDarkMutedSwatch()); } }); } }); } } static void setBackgroundColor(View view, Palette.Swatch swatch) { if (view != null && swatch != null) { view.setBackgroundColor(swatch.getRgb()); } } } }