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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.util;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.LauncherActivityInfo;
import android.os.UserHandle;
import com.android.launcher3.Utilities;
import com.android.launcher3.compat.LauncherAppsCompat;
import com.android.launcher3.compat.LauncherAppsCompat.OnAppsChangedCallbackCompat;
import com.android.launcher3.compat.UserManagerCompat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Utility class to track list of installed packages. It persists the list so that apps
* installed/uninstalled while Launcher was dead can also be handled properly.
*/
public abstract class CachedPackageTracker implements OnAppsChangedCallbackCompat {
protected static final String INSTALLED_PACKAGES_PREFIX = "installed_packages_for_user_";
protected final SharedPreferences mPrefs;
protected final UserManagerCompat mUserManager;
protected final LauncherAppsCompat mLauncherApps;
public CachedPackageTracker(Context context, String preferenceFileName) {
mPrefs = context.getSharedPreferences(preferenceFileName, Context.MODE_PRIVATE);
mUserManager = UserManagerCompat.getInstance(context);
mLauncherApps = LauncherAppsCompat.getInstance(context);
}
/**
* Checks the list of user apps, and generates package event accordingly.
* {@see #onLauncherAppsAdded}, {@see #onLauncherPackageRemoved}
*/
public void processUserApps(List<LauncherActivityInfo> apps, UserHandle user) {
String prefKey = INSTALLED_PACKAGES_PREFIX + mUserManager.getSerialNumberForUser(user);
HashSet<String> oldPackageSet = new HashSet<>();
final boolean userAppsExisted = getUserApps(oldPackageSet, prefKey);
HashSet<String> packagesRemoved = new HashSet<>(oldPackageSet);
HashSet<String> newPackageSet = new HashSet<>();
ArrayList<LauncherActivityInstallInfo> packagesAdded = new ArrayList<>();
for (LauncherActivityInfo info : apps) {
String packageName = info.getComponentName().getPackageName();
newPackageSet.add(packageName);
packagesRemoved.remove(packageName);
if (!oldPackageSet.contains(packageName)) {
oldPackageSet.add(packageName);
packagesAdded.add(new LauncherActivityInstallInfo(
info, info.getFirstInstallTime()));
}
}
if (!packagesAdded.isEmpty() || !packagesRemoved.isEmpty()) {
mPrefs.edit().putStringSet(prefKey, newPackageSet).apply();
if (!packagesAdded.isEmpty()) {
Collections.sort(packagesAdded);
onLauncherAppsAdded(packagesAdded, user, userAppsExisted);
}
if (!packagesRemoved.isEmpty()) {
for (String pkg : packagesRemoved) {
onLauncherPackageRemoved(pkg, user);
}
}
}
}
/**
* Reads the list of user apps which have already been processed.
* @return false if the list didn't exist, true otherwise
*/
private boolean getUserApps(HashSet<String> outExistingApps, String prefKey) {
Set<String> userApps = mPrefs.getStringSet(prefKey, null);
if (userApps == null) {
return false;
} else {
outExistingApps.addAll(userApps);
return true;
}
}
@Override
public void onPackageRemoved(String packageName, UserHandle user) {
String prefKey = INSTALLED_PACKAGES_PREFIX + mUserManager.getSerialNumberForUser(user);
HashSet<String> packageSet = new HashSet<>();
if (getUserApps(packageSet, prefKey) && packageSet.remove(packageName)) {
mPrefs.edit().putStringSet(prefKey, packageSet).apply();
}
onLauncherPackageRemoved(packageName, user);
}
@Override
public void onPackageAdded(String packageName, UserHandle user) {
String prefKey = INSTALLED_PACKAGES_PREFIX + mUserManager.getSerialNumberForUser(user);
HashSet<String> packageSet = new HashSet<>();
final boolean userAppsExisted = getUserApps(packageSet, prefKey);
if (!packageSet.contains(packageName)) {
List<LauncherActivityInfo> activities =
mLauncherApps.getActivityList(packageName, user);
if (!activities.isEmpty()) {
LauncherActivityInfo activityInfo = activities.get(0);
packageSet.add(packageName);
mPrefs.edit().putStringSet(prefKey, packageSet).apply();
onLauncherAppsAdded(Arrays.asList(
new LauncherActivityInstallInfo(activityInfo, System.currentTimeMillis())),
user, userAppsExisted);
}
}
}
@Override
public void onPackageChanged(String packageName, UserHandle user) { }
@Override
public void onPackagesAvailable(
String[] packageNames, UserHandle user, boolean replacing) { }
@Override
public void onPackagesUnavailable(
String[] packageNames, UserHandle user, boolean replacing) { }
@Override
public void onPackagesSuspended(String[] packageNames, UserHandle user) { }
@Override
public void onPackagesUnsuspended(String[] packageNames, UserHandle user) { }
/**
* Called when new launcher apps are added.
* @param apps list of newly added activities. Only one entry per package is sent.
* @param user the user for this event. All activities in {@param apps} will belong to
* the same user.
* @param userAppsExisted false if the list was processed for the first time, like in case
* when Launcher was newly installed or a new user was added.
*/
protected abstract void onLauncherAppsAdded(List<LauncherActivityInstallInfo> apps,
UserHandle user, boolean userAppsExisted);
/**
* Called when apps are removed from the system.
*/
protected abstract void onLauncherPackageRemoved(String packageName, UserHandle user);
public static class LauncherActivityInstallInfo
implements Comparable<LauncherActivityInstallInfo> {
public final LauncherActivityInfo info;
public final long installTime;
public LauncherActivityInstallInfo(LauncherActivityInfo info, long installTime) {
this.info = info;
this.installTime = installTime;
}
@Override
public int compareTo(LauncherActivityInstallInfo another) {
return Utilities.longCompare(installTime, another.installTime);
}
}
}
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