Java tutorial
/* * Copyright (C) 2013 Dominik Schrmann <dominik@dominikschuermann.de> * * 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.thialfihar.android.apg.ui; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Build; 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.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.view.MenuItemCompat; import android.support.v7.widget.SearchView; import android.text.TextUtils; import android.view.ActionMode; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.AdapterView; import android.widget.ListView; import android.widget.Toast; import com.beardedhen.androidbootstrap.BootstrapButton; import org.thialfihar.android.apg.Id; import org.thialfihar.android.apg.R; import org.thialfihar.android.apg.provider.KeychainContract; import org.thialfihar.android.apg.provider.KeychainContract.KeyRings; import org.thialfihar.android.apg.provider.KeychainContract.UserIds; import org.thialfihar.android.apg.provider.ProviderHelper; import org.thialfihar.android.apg.ui.adapter.KeyListPublicAdapter; import org.thialfihar.android.apg.ui.dialog.DeleteKeyDialogFragment; import se.emilsjolander.stickylistheaders.ApiLevelTooLowException; import se.emilsjolander.stickylistheaders.StickyListHeadersListView; import java.util.ArrayList; import java.util.Set; /** * Public key list with sticky list headers. It does _not_ extend ListFragment because it uses * StickyListHeaders library which does not extend upon ListView. */ public class KeyListPublicFragment extends Fragment implements SearchView.OnQueryTextListener, AdapterView.OnItemClickListener, LoaderManager.LoaderCallbacks<Cursor> { private KeyListPublicAdapter mAdapter; private StickyListHeadersListView mStickyList; private String mCurQuery; private SearchView mSearchView; // empty list layout private BootstrapButton mButtonEmptyCreate; private BootstrapButton mButtonEmptyImport; /** * Load custom layout with StickyListView from library */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.key_list_public_fragment, container, false); setHasOptionsMenu(true); mButtonEmptyCreate = (BootstrapButton) view.findViewById(R.id.key_list_empty_button_create); mButtonEmptyCreate.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getActivity(), EditKeyActivity.class); intent.setAction(EditKeyActivity.ACTION_CREATE_KEY); intent.putExtra(EditKeyActivity.EXTRA_GENERATE_DEFAULT_KEYS, true); intent.putExtra(EditKeyActivity.EXTRA_USER_IDS, ""); // show user id view startActivityForResult(intent, 0); } }); mButtonEmptyImport = (BootstrapButton) view.findViewById(R.id.key_list_empty_button_import); mButtonEmptyImport.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getActivity(), ImportKeysActivity.class); intent.setAction(ImportKeysActivity.ACTION_IMPORT_KEY_FROM_FILE); startActivityForResult(intent, 0); } }); return view; } /** * Define Adapter and Loader on create of Activity */ @SuppressLint("NewApi") @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mStickyList = (StickyListHeadersListView) getActivity().findViewById(R.id.list); mStickyList.setOnItemClickListener(this); mStickyList.setAreHeadersSticky(true); mStickyList.setDrawingListUnderStickyHeader(false); mStickyList.setFastScrollEnabled(true); try { mStickyList.setFastScrollAlwaysVisible(true); } catch (ApiLevelTooLowException e) { } // this view is made visible if no data is available mStickyList.setEmptyView(getActivity().findViewById(R.id.empty)); /* * ActionBarSherlock does not support MultiChoiceModeListener. Thus multi-selection is only * available for Android >= 3.0 */ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { mStickyList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL); mStickyList.getWrappedList().setMultiChoiceModeListener(new MultiChoiceModeListener() { @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { android.view.MenuInflater inflater = getActivity().getMenuInflater(); inflater.inflate(R.menu.key_list_public_multi, menu); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { Set<Integer> positions = mAdapter.getCurrentCheckedPosition(); // get IDs for checked positions as long array long[] ids = new long[positions.size()]; int i = 0; for (int pos : positions) { ids[i] = mAdapter.getItemId(pos); i++; } switch (item.getItemId()) { case R.id.menu_key_list_public_multi_encrypt: { encrypt(mode, ids); break; } case R.id.menu_key_list_public_multi_delete: { showDeleteKeyDialog(mode, ids); break; } case R.id.menu_key_list_public_multi_select_all: { // select all int localCount = mStickyList.getCount(); for (int k = 0; k < localCount; k++) { mStickyList.setItemChecked(k, true); } break; } } return true; } @Override public void onDestroyActionMode(ActionMode mode) { mAdapter.clearSelection(); } @Override public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) { if (checked) { mAdapter.setNewSelection(position, checked); } else { mAdapter.removeSelection(position); } int count = mAdapter.getCurrentCheckedPosition().size(); String keysSelected = getResources().getQuantityString(R.plurals.key_list_selected_keys, count, count); mode.setTitle(keysSelected); } }); } // NOTE: Not supported by StickyListHeader, thus no indicator is shown while loading // Start out with a progress indicator. // setListShown(false); // Create an empty adapter we will use to display the loaded data. mAdapter = new KeyListPublicAdapter(getActivity(), null, Id.type.public_key, USER_ID_INDEX); mStickyList.setAdapter(mAdapter); // Prepare the loader. Either re-connect with an existing one, // or start a new one. getLoaderManager().initLoader(0, null, this); } // These are the rows that we will retrieve. static final String[] PROJECTION = new String[] { KeychainContract.KeyRings._ID, KeychainContract.KeyRings.MASTER_KEY_ID, KeychainContract.UserIds.USER_ID, KeychainContract.Keys.IS_REVOKED }; static final int USER_ID_INDEX = 2; static final String SORT_ORDER = UserIds.USER_ID + " ASC"; @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { // This is called when a new Loader needs to be created. This // sample only has one Loader, so we don't care about the ID. Uri baseUri = KeyRings.buildPublicKeyRingsUri(); String where = null; String whereArgs[] = null; if (mCurQuery != null) { where = KeychainContract.UserIds.USER_ID + " LIKE ?"; whereArgs = new String[] { mCurQuery + "%" }; } // Now create and return a CursorLoader that will take care of // creating a Cursor for the data being displayed. return new CursorLoader(getActivity(), baseUri, PROJECTION, where, whereArgs, SORT_ORDER); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { // Swap the new cursor in. (The framework will take care of closing the // old cursor once we return.) mAdapter.swapCursor(data); mStickyList.setAdapter(mAdapter); // NOTE: Not supported by StickyListHeader, thus no indicator is shown while loading // The list should now be shown. // if (isResumed()) { // setListShown(true); // } else { // setListShownNoAnimation(true); // } } @Override public void onLoaderReset(Loader<Cursor> loader) { // This is called when the last Cursor provided to onLoadFinished() // above is about to be closed. We need to make sure we are no // longer using it. mAdapter.swapCursor(null); } /** * On click on item, start key view activity */ @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { Intent viewIntent = null; if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) { viewIntent = new Intent(getActivity(), ViewKeyActivity.class); } else { viewIntent = new Intent(getActivity(), ViewKeyActivityJB.class); } viewIntent.setData(KeychainContract.KeyRings.buildPublicKeyRingsUri(Long.toString(id))); startActivity(viewIntent); } @TargetApi(11) public void encrypt(ActionMode mode, long[] keyRingRowIds) { // get master key ids from row ids long[] keyRingIds = new long[keyRingRowIds.length]; for (int i = 0; i < keyRingRowIds.length; i++) { keyRingIds[i] = ProviderHelper.getPublicMasterKeyId(getActivity(), keyRingRowIds[i]); } Intent intent = new Intent(getActivity(), EncryptActivity.class); intent.setAction(EncryptActivity.ACTION_ENCRYPT); intent.putExtra(EncryptActivity.EXTRA_ENCRYPTION_KEY_IDS, keyRingIds); // used instead of startActivity set actionbar based on callingPackage startActivityForResult(intent, 0); mode.finish(); } /** * Show dialog to delete key * * @param keyRingRowIds */ @TargetApi(11) public void showDeleteKeyDialog(final ActionMode mode, long[] keyRingRowIds) { // Message is received after key is deleted Handler returnHandler = new Handler() { @Override public void handleMessage(Message message) { if (message.what == DeleteKeyDialogFragment.MESSAGE_OKAY) { Bundle returnData = message.getData(); if (returnData != null && returnData.containsKey(DeleteKeyDialogFragment.MESSAGE_NOT_DELETED)) { ArrayList<String> notDeleted = returnData .getStringArrayList(DeleteKeyDialogFragment.MESSAGE_NOT_DELETED); String notDeletedMsg = ""; for (String userId : notDeleted) { notDeletedMsg += userId + "\n"; } Toast.makeText(getActivity(), getString(R.string.error_can_not_delete_contacts, notDeletedMsg) + getResources() .getQuantityString(R.plurals.error_can_not_delete_info, notDeleted.size()), Toast.LENGTH_LONG).show(); mode.finish(); } } } }; // Create a new Messenger for the communication back Messenger messenger = new Messenger(returnHandler); DeleteKeyDialogFragment deleteKeyDialog = DeleteKeyDialogFragment.newInstance(messenger, keyRingRowIds, Id.type.public_key); deleteKeyDialog.show(getActivity().getSupportFragmentManager(), "deleteKeyDialog"); } @Override public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { // Get the searchview MenuItem searchItem = menu.findItem(R.id.menu_key_list_public_search); mSearchView = (SearchView) MenuItemCompat.getActionView(searchItem); // Execute this when searching mSearchView.setOnQueryTextListener(this); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onQueryTextSubmit(String s) { return true; } @Override public boolean onQueryTextChange(String s) { // Called when the action bar search text has changed. Update // the search filter, and restart the loader to do a new query // with this filter. String newQuery = !TextUtils.isEmpty(s) ? s : null; mCurQuery = newQuery; getLoaderManager().restartLoader(0, null, this); return true; } }