/*
* Copyright 2015. Appsi Mobile
*
* 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.appsimobile.appsii.module.apps;
import android.content.AsyncTaskLoader;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.support.annotation.Nullable;
import com.appsimobile.appsii.compat.LauncherActivityInfoCompat;
import com.appsimobile.appsii.compat.LauncherAppsCompat;
import com.appsimobile.appsii.compat.UserHandleCompat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* A custom Loader that loads all of the installed applications.
*/
public class AppListLoader extends AsyncTaskLoader<List<AppEntry>> {
static final Map<ComponentName, CharSequence> sLabelCache = new ConcurrentHashMap<>();
final InterestingConfigChanges mLastConfig = new InterestingConfigChanges();
final PackageManager mPackageManager;
private final ShortcutNameComparator mShortcutNameComparator;
private final Map<ComponentName, CharSequence> mLabelCache;
List<AppEntry> mApps;
PackageIntentReceiver mPackageObserver;
LauncherAppsCompat mLauncherAppsCompat;
public AppListLoader(Context context, LauncherAppsCompat launcherAppsCompat) {
super(context);
mLauncherAppsCompat = launcherAppsCompat;
mLabelCache = sLabelCache;
// Retrieve the package manager for later use; note we don't
// use 'context' directly but instead the save global application
// context returned by getContext().
mPackageManager = getContext().getPackageManager();
mShortcutNameComparator =
new ShortcutNameComparator(context, mLabelCache, launcherAppsCompat);
}
static ComponentName getComponentNameFromResolveInfo(ResolveInfo info) {
if (info.activityInfo != null) {
return new ComponentName(info.activityInfo.packageName, info.activityInfo.name);
} else {
return new ComponentName(info.serviceInfo.packageName, info.serviceInfo.name);
}
}
/**
* Handles a request to cancel a load.
*/
@Override
public void onCanceled(List<AppEntry> apps) {
super.onCanceled(apps);
// At this point we can release the resources associated with 'apps'
// if needed.
onReleaseResources(apps);
}
/**
* This is where the bulk of our work is done. This function is
* called in a background thread and should generate a new set of
* data to be published by the loader.
*/
@Override
public List<AppEntry> loadInBackground() {
List<AppEntry> result = new ArrayList<>();
LauncherAppsCompat lap = mLauncherAppsCompat;
List<LauncherActivityInfoCompat> apps =
lap.getActivityList(null, UserHandleCompat.myUserHandle());
// Fail if we don't have any apps
if (apps == null || apps.isEmpty()) {
return null;
}
// Sort the applications by name
Collections.sort(apps, mShortcutNameComparator);
// Create the ApplicationInfos
for (int i = 0; i < apps.size(); i++) {
LauncherActivityInfoCompat app = apps.get(i);
CharSequence label;
ComponentName componentName = app.getComponentName();
if (mLabelCache.containsKey(componentName)) {
label = mLabelCache.get(componentName);
} else {
label = app.getLabel().toString().trim();
mLabelCache.put(componentName, label);
}
AppEntry entry = new ResolveInfoAppEntry(app, label);
result.add(entry);
}
return result;
}
/**
* Helper function to take care of releasing resources associated
* with an actively loaded data set.
*/
protected void onReleaseResources(List<AppEntry> apps) {
// For a simple List<> there is nothing to do. For something
// like a Cursor, we would close it here.
}
@Nullable
private List<ResolveInfo> getResolveInfosSafely(Intent mainIntent) {
return getResolveInfosSafely(mainIntent, 0);
}
@Nullable
private List<ResolveInfo> getResolveInfosSafely(Intent mainIntent, int counter) {
try {
return mPackageManager.queryIntentActivities(mainIntent, 0);
} catch (RuntimeException e) {
// We try to fix the package manager here to fix this exception
// Caused by: java.lang.RuntimeException: Package manager has died
if (counter < 6) {
counter++;
try {
Thread.sleep(counter * 100);
} catch (InterruptedException ignore) {
return null;
}
return getResolveInfosSafely(mainIntent, counter);
}
}
return null;
}
/**
* Called when there is new data to deliver to the client. The
* super class will take care of delivering it; the implementation
* here just adds a little more logic.
*/
@Override
public void deliverResult(List<AppEntry> apps) {
if (isReset()) {
// An async query came in while the loader is stopped. We
// don't need the result.
if (apps != null) {
onReleaseResources(apps);
}
}
List<AppEntry> oldApps = mApps;
mApps = apps;
if (isStarted()) {
// If the Loader is currently started, we can immediately
// deliver its results.
super.deliverResult(apps);
}
// At this point we can release the resources associated with
// 'oldApps' if needed; now that the new result is delivered we
// know that it is no longer in use.
if (oldApps != null) {
onReleaseResources(oldApps);
}
}
/**
* Handles a request to start the Loader.
*/
@Override
protected void onStartLoading() {
if (mApps != null) {
// If we currently have a result available, deliver it
// immediately.
deliverResult(mApps);
}
// Start watching for changes in the app data.
if (mPackageObserver == null) {
mPackageObserver = new PackageIntentReceiver(this);
}
// Has something interesting in the configuration changed since we
// last built the app list?
boolean configChange = mLastConfig.applyNewConfig(getContext().getResources());
if (takeContentChanged() || mApps == null || configChange) {
// If the data has changed since the last time it was loaded
// or is not currently available, start a load.
forceLoad();
}
}
/**
* Handles a request to stop the Loader.
*/
@Override
protected void onStopLoading() {
// Attempt to cancel the current load task if possible.
cancelLoad();
}
/**
* Handles a request to completely reset the Loader.
*/
@Override
protected void onReset() {
super.onReset();
// Ensure the loader is stopped
onStopLoading();
// At this point we can release the resources associated with 'apps'
// if needed.
if (mApps != null) {
onReleaseResources(mApps);
mApps = null;
}
// Stop monitoring for changes.
if (mPackageObserver != null) {
getContext().unregisterReceiver(mPackageObserver);
mPackageObserver = null;
}
}
}