android: Add list fragment for the selection of apps
This commit is contained in:
Tobias Brunner
+267
@@ -0,0 +1,267 @@
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/*
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* Copyright (C) 2017 Tobias Brunner
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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package org.strongswan.android.ui;
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import android.Manifest;
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import android.content.Context;
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import android.content.pm.ApplicationInfo;
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import android.content.pm.PackageManager;
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import android.os.Bundle;
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import android.support.annotation.Nullable;
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import android.support.v4.app.ListFragment;
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import android.support.v4.app.LoaderManager;
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import android.support.v4.content.AsyncTaskLoader;
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import android.support.v4.content.Loader;
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import android.support.v7.widget.SearchView;
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import android.text.TextUtils;
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import android.util.Pair;
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import android.view.Menu;
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import android.view.MenuInflater;
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import android.view.MenuItem;
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import android.view.View;
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import android.widget.Filter;
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import android.widget.ListView;
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import org.strongswan.android.R;
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import org.strongswan.android.data.VpnProfileDataSource;
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import org.strongswan.android.ui.adapter.SelectedApplicationEntry;
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import org.strongswan.android.ui.adapter.SelectedApplicationsAdapter;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.SortedSet;
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import java.util.TreeSet;
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public class SelectedApplicationsListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Pair<List<SelectedApplicationEntry>, List<String>>>, SearchView.OnQueryTextListener
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{
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private SelectedApplicationsAdapter mAdapter;
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private SortedSet<String> mSelection;
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@Override
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public void onActivityCreated(@Nullable Bundle savedInstanceState)
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{
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super.onActivityCreated(savedInstanceState);
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setHasOptionsMenu(true);
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getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
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mAdapter = new SelectedApplicationsAdapter(getActivity());
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setListAdapter(mAdapter);
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setListShown(false);
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ArrayList<String> selection;
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if (savedInstanceState == null)
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{
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selection = getActivity().getIntent().getStringArrayListExtra(VpnProfileDataSource.KEY_SELECTED_APPS_LIST);
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}
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else
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{
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selection = savedInstanceState.getStringArrayList(VpnProfileDataSource.KEY_SELECTED_APPS_LIST);
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}
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mSelection = new TreeSet<>(selection);
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getLoaderManager().initLoader(0, null, this);
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}
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@Override
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public void onSaveInstanceState(Bundle outState)
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{
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super.onSaveInstanceState(outState);
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outState.putStringArrayList(VpnProfileDataSource.KEY_SELECTED_APPS_LIST, new ArrayList<>(mSelection));
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}
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/**
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* Returns the package names of all selected apps
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*/
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public ArrayList<String> getSelectedApplications()
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{
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return new ArrayList<>(mSelection);
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}
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/**
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* Track check state as ListView is unable to do that when using filters
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*/
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@Override
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public void onListItemClick(ListView l, View v, int position, long id)
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{
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super.onListItemClick(l, v, position, id);
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SelectedApplicationEntry item = (SelectedApplicationEntry)getListView().getItemAtPosition(position);
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item.setSelected(!item.isSelected());
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if (item.isSelected())
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{
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mSelection.add(item.getInfo().packageName);
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}
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else
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{
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mSelection.remove(item.getInfo().packageName);
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}
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}
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/**
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* Manually set the check state as ListView is unable to track that when using filters
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*/
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private void setCheckState()
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{
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for (int i = 0; i < getListView().getCount(); i++)
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{
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SelectedApplicationEntry item = mAdapter.getItem(i);
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getListView().setItemChecked(i, item.isSelected());
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}
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}
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@Override
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public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
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{
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MenuItem item = menu.add(R.string.search);
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item.setIcon(android.R.drawable.ic_menu_search);
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item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
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SearchView sv = new SearchView(getActivity());
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sv.setOnQueryTextListener(this);
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item.setActionView(sv);
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super.onCreateOptionsMenu(menu, inflater);
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}
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@Override
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public Loader<Pair<List<SelectedApplicationEntry>, List<String>>> onCreateLoader(int id, Bundle args)
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{
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return new InstalledPackagesLoader(getActivity(), mSelection);
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}
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@Override
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public void onLoadFinished(Loader<Pair<List<SelectedApplicationEntry>, List<String>>> loader, Pair<List<SelectedApplicationEntry>, List<String>> data)
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{
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mAdapter.setData(data.first);
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mSelection.removeAll(data.second);
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setCheckState();
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if (isResumed())
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{
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setListShown(true);
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}
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else
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{
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setListShownNoAnimation(true);
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}
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}
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@Override
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public void onLoaderReset(Loader<Pair<List<SelectedApplicationEntry>, List<String>>> loader)
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{
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mAdapter.setData(null);
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}
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@Override
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public boolean onQueryTextSubmit(String query)
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{
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return true;
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}
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@Override
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public boolean onQueryTextChange(String newText)
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{
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String search = TextUtils.isEmpty(newText) ? null : newText;
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mAdapter.getFilter().filter(search, new Filter.FilterListener()
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{
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@Override
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public void onFilterComplete(int count)
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{
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setCheckState();
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}
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});
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return true;
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}
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public static class InstalledPackagesLoader extends AsyncTaskLoader<Pair<List<SelectedApplicationEntry>, List<String>>>
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{
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private final PackageManager mPackageManager;
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private final SortedSet<String> mSelection;
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private Pair<List<SelectedApplicationEntry>, List<String>> mData;
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public InstalledPackagesLoader(Context context, SortedSet<String> selection)
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{
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super(context);
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mPackageManager = context.getPackageManager();
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mSelection = selection;
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}
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@Override
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public Pair<List<SelectedApplicationEntry>, List<String>> loadInBackground()
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{
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List<SelectedApplicationEntry> apps = new ArrayList<>();
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SortedSet<String> seen = new TreeSet<>();
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for (ApplicationInfo info : mPackageManager.getInstalledApplications(PackageManager.GET_META_DATA))
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{
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/* skip apps that can't access the network anyway */
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if (mPackageManager.checkPermission(Manifest.permission.INTERNET, info.packageName) == PackageManager.PERMISSION_GRANTED)
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{
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SelectedApplicationEntry entry = new SelectedApplicationEntry(mPackageManager, info);
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entry.setSelected(mSelection.contains(info.packageName));
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apps.add(entry);
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seen.add(info.packageName);
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}
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}
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Collections.sort(apps);
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/* check for selected packages that don't exist anymore */
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List<String> missing = new ArrayList<>();
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for (String pkg : mSelection)
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{
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if (!seen.contains(pkg))
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{
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missing.add(pkg);
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}
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}
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return new Pair<>(apps, missing);
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}
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@Override
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protected void onStartLoading()
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{
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if (mData != null)
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{ /* if we have data ready, deliver it directly */
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deliverResult(mData);
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}
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if (takeContentChanged() || mData == null)
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{
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forceLoad();
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}
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}
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@Override
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public void deliverResult(Pair<List<SelectedApplicationEntry>, List<String>> data)
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{
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if (isReset())
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{
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return;
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}
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mData = data;
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if (isStarted())
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{ /* if it is started we deliver the data directly,
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* otherwise this is handled in onStartLoading */
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super.deliverResult(data);
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}
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}
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@Override
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protected void onReset()
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{
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mData = null;
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super.onReset();
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}
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}
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}
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