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/*
* Copyright (C) 2016 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.android.launcher3.dynamicui;
import android.app.WallpaperManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import com.android.launcher3.Utilities;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Contains helper fields and methods related to extracting colors from the wallpaper.
*/
public class ExtractionUtils {
public static final String EXTRACTED_COLORS_PREFERENCE_KEY = "pref_extractedColors";
public static final String WALLPAPER_ID_PREFERENCE_KEY = "pref_wallpaperId";
private static final int FLAG_SET_SYSTEM = 1 << 0; // TODO: use WallpaperManager.FLAG_SET_SYSTEM
/**
* Extract colors in the :wallpaper-chooser process, if the wallpaper id has changed.
* When the new colors are saved in the LauncherProvider,
* Launcher will be notified in Launcher#onSettingsChanged(String, String).
*/
public static void startColorExtractionServiceIfNecessary(final Context context) {
// Run on a background thread, since the service is asynchronous anyway.
Utilities.THREAD_POOL_EXECUTOR.execute(new Runnable() {
@Override
public void run() {
if (hasWallpaperIdChanged(context)) {
context.startService(new Intent(context, ColorExtractionService.class));
}
}
});
}
private static boolean hasWallpaperIdChanged(Context context) {
if (!Utilities.isNycOrAbove()) {
// TODO: update an id in sharedprefs in onWallpaperChanged broadcast, and read it here.
return false;
}
final SharedPreferences sharedPrefs = Utilities.getPrefs(context);
int wallpaperId = getWallpaperId(WallpaperManager.getInstance(context));
int savedWallpaperId = sharedPrefs.getInt(ExtractionUtils.WALLPAPER_ID_PREFERENCE_KEY, -1);
return wallpaperId != savedWallpaperId;
}
public static int getWallpaperId(WallpaperManager wallpaperManager) {
// TODO: use WallpaperManager#getWallpaperId(WallpaperManager.FLAG_SET_SYSTEM) directly.
try {
Method getWallpaperId = WallpaperManager.class.getMethod("getWallpaperId", int.class);
return (int) getWallpaperId.invoke(wallpaperManager, FLAG_SET_SYSTEM);
} catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException e) {
return -1;
}
}
}
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