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/**
* Copyright (c) 2018 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;
import android.app.Application;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.AsyncTask;
import androidx.lifecycle.AndroidViewModel;
import androidx.lifecycle.LiveData;
import java.util.ArrayList;
import java.util.List;
/**
* A view model that provides a list of activities that can be launched.
*/
public class AppListViewModel extends AndroidViewModel {
private final AppListLiveData mLiveData;
private final PackageIntentReceiver
mPackageIntentReceiver;
public AppListViewModel(Application application) {
super(application);
mLiveData = new AppListLiveData(application);
mPackageIntentReceiver = new PackageIntentReceiver(mLiveData, application);
}
public LiveData<List<AppEntry>> getAppList() {
return mLiveData;
}
protected void onCleared() {
getApplication().unregisterReceiver(mPackageIntentReceiver);
}
}
class AppListLiveData extends LiveData<List<AppEntry>> {
private final PackageManager mPackageManager;
private int mCurrentDataVersion;
public AppListLiveData(Context context) {
mPackageManager = context.getPackageManager();
loadData();
}
void loadData() {
final int loadDataVersion = ++mCurrentDataVersion;
new AsyncTask<Void, Void, List<AppEntry>>() {
@Override
protected List<AppEntry> doInBackground(Void... voids) {
Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> apps = mPackageManager.queryIntentActivities(mainIntent,
PackageManager.GET_META_DATA);
List<AppEntry> entries = new ArrayList<>();
if (apps != null) {
for (ResolveInfo app : apps) {
AppEntry entry = new AppEntry(app, mPackageManager);
entries.add(entry);
}
}
return entries;
}
@Override
protected void onPostExecute(List<AppEntry> data) {
if (mCurrentDataVersion == loadDataVersion) {
setValue(data);
}
}
}.execute();
}
}
/**
* Receiver used to notify live data about app list changes.
*/
class PackageIntentReceiver extends BroadcastReceiver {
private final AppListLiveData mLiveData;
public PackageIntentReceiver(AppListLiveData liveData, Context context) {
mLiveData = liveData;
IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
filter.addDataScheme("package");
context.registerReceiver(this, filter);
// Register for events related to sdcard installation.
IntentFilter sdFilter = new IntentFilter();
sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
context.registerReceiver(this, sdFilter);
}
@Override
public void onReceive(Context context, Intent intent) {
mLiveData.loadData();
}
}
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