Java tutorial
/* * Copyright (C) 2012-2015 Dominik Schrmann <dominik@dominikschuermann.de> * Copyright (C) 2015 Adithya Abraham Philip <adithyaphilip@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.sufficientlysecure.keychain.ui; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.Messenger; import android.support.v4.app.Fragment; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.helper.ItemTouchHelper; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.ui.dialog.AddEditSmartPGPAuthorityDialogFragment; import org.sufficientlysecure.keychain.ui.util.Notify; import org.sufficientlysecure.keychain.ui.util.recyclerview.ItemTouchHelperAdapter; import org.sufficientlysecure.keychain.ui.util.recyclerview.ItemTouchHelperDragCallback; import org.sufficientlysecure.keychain.ui.util.recyclerview.ItemTouchHelperViewHolder; import org.sufficientlysecure.keychain.ui.util.recyclerview.RecyclerItemClickListener; import java.io.IOException; import java.io.InputStream; import java.security.KeyStore; import java.security.KeyStoreException; import java.security.cert.Certificate; import java.security.cert.CertificateException; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; import java.util.ArrayList; import java.util.Collections; import java.util.Enumeration; import java.util.LinkedList; import java.util.List; public class SettingsSmartPGPAuthorityFragment extends Fragment implements RecyclerItemClickListener.OnItemClickListener { private ItemTouchHelper mItemTouchHelper; private ArrayList<String> mAuthorities; private AuthorityListAdapter mAdapter; public static SettingsSmartPGPAuthorityFragment newInstance(String[] authorities) { return new SettingsSmartPGPAuthorityFragment(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.settings_smartpgp_authority_fragment, null); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); List<String> authorities = new LinkedList(); try { final KeyStore ks = SettingsSmartPGPAuthoritiesActivity.readKeystore(getActivity()); final Enumeration<String> it = ks.aliases(); while (it.hasMoreElements()) { authorities.add(it.nextElement()); } } catch (Exception e) { } mAuthorities = new ArrayList<>(authorities); mAdapter = new AuthorityListAdapter(mAuthorities); RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.smartpgp_authority_recycler_view); recyclerView.setAdapter(mAdapter); recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); ItemTouchHelper.Callback callback = new ItemTouchHelperDragCallback(mAdapter); mItemTouchHelper = new ItemTouchHelper(callback); mItemTouchHelper.attachToRecyclerView(recyclerView); // for clicks recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), this)); // can't use item decoration because it doesn't move with drag and drop // recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), null)); // We have a menu item to show in action bar. setHasOptionsMenu(true); } @Override public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { inflater.inflate(R.menu.smartpgp_authority_pref_menu, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_add_smartpgp_authority: startAddAuthorityDialog(); return true; default: return super.onOptionsItemSelected(item); } } private void startAddAuthorityDialog() { startEditAuthorityDialog(AddEditSmartPGPAuthorityDialogFragment.Action.ADD, null, null, -1); } private void startEditAuthorityDialog(AddEditSmartPGPAuthorityDialogFragment.Action action, final String old_alias, final Uri uri, final int position) { Handler returnHandler = new Handler() { @Override public void handleMessage(Message message) { Bundle data = message.getData(); final String new_alias = data.getString(AddEditSmartPGPAuthorityDialogFragment.OUT_ALIAS); final int position = data.getInt(AddEditSmartPGPAuthorityDialogFragment.OUT_POSITION); final String uri = data.getString(AddEditSmartPGPAuthorityDialogFragment.OUT_URI); final AddEditSmartPGPAuthorityDialogFragment.Action action = (AddEditSmartPGPAuthorityDialogFragment.Action) data .getSerializable(AddEditSmartPGPAuthorityDialogFragment.OUT_ACTION); switch (action) { case ADD: if (editAuthority(old_alias, new_alias, position, uri)) { Notify.create(getActivity(), "Authority " + new_alias + " added", Notify.LENGTH_SHORT, Notify.Style.OK).show(); } break; case EDIT: if (editAuthority(old_alias, new_alias, position, uri)) { Notify.create(getActivity(), "Authority " + old_alias + " modified", Notify.LENGTH_SHORT, Notify.Style.OK).show(); } break; case DELETE: if (deleteAuthority(position)) { Notify.create(getActivity(), "Authority " + old_alias + " deleted", Notify.LENGTH_SHORT, Notify.Style.OK).show(); } break; } } }; // Create a new Messenger for the communication back Messenger messenger = new Messenger(returnHandler); AddEditSmartPGPAuthorityDialogFragment dialogFragment = AddEditSmartPGPAuthorityDialogFragment .newInstance(messenger, action, old_alias, uri, position); dialogFragment.show(getFragmentManager(), "addSmartPGPAuthorityDialog"); } private boolean editAuthority(final String old_alias, final String new_alias, final int position, final String uri) { try { final KeyStore ks = SettingsSmartPGPAuthoritiesActivity.readKeystore(getContext()); if (ks == null) { throw new KeyStoreException("no keystore found"); } Certificate old_cert = null; if (old_alias != null) { old_cert = ks.getCertificate(old_alias); ks.deleteEntry(old_alias); mAuthorities.remove(old_alias); mAdapter.notifyItemRemoved(position); } Certificate new_cert = null; if (uri == null) { new_cert = old_cert; } else { final InputStream fis = getContext().getContentResolver().openInputStream(Uri.parse(uri)); final CertificateFactory cf = CertificateFactory.getInstance("X.509"); new_cert = cf.generateCertificate(fis); if (!(new_cert instanceof X509Certificate)) { Notify.create(getActivity(), "Invalid certificate", Notify.LENGTH_LONG, Notify.Style.ERROR) .show(); return false; } fis.close(); } if (new_alias == null || new_cert == null) { Notify.create(getActivity(), "Missing alias or certificate", Notify.LENGTH_LONG, Notify.Style.ERROR) .show(); return false; } final X509Certificate x509cert = (X509Certificate) new_cert; x509cert.checkValidity(); ks.setCertificateEntry(new_alias, x509cert); SettingsSmartPGPAuthoritiesActivity.writeKeystore(getContext(), ks); mAuthorities.add(new_alias); mAdapter.notifyItemInserted(mAuthorities.size() - 1); return true; } catch (IOException e) { Notify.create(getActivity(), "failed to open certificate (" + e.getMessage() + ")", Notify.LENGTH_LONG, Notify.Style.ERROR).show(); } catch (CertificateException e) { Notify.create(getActivity(), "invalid certificate (" + e.getMessage() + ")", Notify.LENGTH_LONG, Notify.Style.ERROR).show(); } catch (KeyStoreException e) { Notify.create(getActivity(), "invalid keystore (" + e.getMessage() + ")", Notify.LENGTH_LONG, Notify.Style.ERROR).show(); } return false; } private boolean deleteAuthority(final int position) { try { final KeyStore ks = SettingsSmartPGPAuthoritiesActivity.readKeystore(getContext()); if (ks == null) { return false; } ks.deleteEntry(mAuthorities.get(position)); SettingsSmartPGPAuthoritiesActivity.writeKeystore(getContext(), ks); mAuthorities.remove(mAuthorities.get(position)); mAdapter.notifyItemRemoved(position); return true; } catch (Exception e) { return false; } } @Override public void onItemClick(View view, int position) { startEditAuthorityDialog(AddEditSmartPGPAuthorityDialogFragment.Action.EDIT, mAuthorities.get(position), null, position); } public class AuthorityListAdapter extends RecyclerView.Adapter<AuthorityListAdapter.ViewHolder> implements ItemTouchHelperAdapter { private final List<String> mAuthorities; public AuthorityListAdapter(List<String> authorities) { mAuthorities = authorities; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.settings_smartpgp_authority_item, parent, false); return new ViewHolder(view); } @Override public void onBindViewHolder(final ViewHolder holder, int position) { holder.authorityName.setText(mAuthorities.get(position)); } @Override public void onItemMove(RecyclerView.ViewHolder source, RecyclerView.ViewHolder target, int fromPosition, int toPosition) { Collections.swap(mAuthorities, fromPosition, toPosition); notifyItemMoved(fromPosition, toPosition); } @Override public int getItemCount() { return mAuthorities.size(); } public class ViewHolder extends RecyclerView.ViewHolder implements ItemTouchHelperViewHolder { public final ViewGroup outerLayout; public final TextView authorityName; public ViewHolder(View itemView) { super(itemView); outerLayout = (ViewGroup) itemView.findViewById(R.id.outer_layout); authorityName = (TextView) itemView.findViewById(R.id.smartpgp_authority_tv); itemView.setClickable(true); } @Override public void onItemSelected() { } @Override public void onItemClear() { } } } }