Java tutorial
/* * Copyright (C) 2012-2013 Dominik Schrmann <dominik@dominikschuermann.de> * Copyright (C) 2010 Thialfihar <thi@thialfihar.org> * * 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 id.nci.stm_9; import java.util.Date; import java.util.Vector; //import id.nci.stm_9.Id; import id.nci.stm_9.R; import id.nci.stm_9.ListFragmentWorkaround; import id.nci.stm_9.KeychainContract.KeyRings; import id.nci.stm_9.KeychainContract.Keys; import id.nci.stm_9.KeychainContract.UserIds; import id.nci.stm_9.KeychainDatabase; import id.nci.stm_9.KeychainDatabase.Tables; import id.nci.stm_9.SelectKeyCursorAdapter; import android.app.Activity; import android.database.Cursor; import android.database.DatabaseUtils; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.widget.ListView; public class SelectPublicKeyFragment extends ListFragmentWorkaround implements LoaderManager.LoaderCallbacks<Cursor> { public static final String ARG_PRESELECTED_KEY_IDS = "preselected_key_ids"; private Activity mActivity; private SelectKeyCursorAdapter mAdapter; private ListView mListView; private long mSelectedMasterKeyIds[]; /** * Creates new instance of this fragment */ public static SelectPublicKeyFragment newInstance(long[] preselectedKeyIds) { SelectPublicKeyFragment frag = new SelectPublicKeyFragment(); Bundle args = new Bundle(); args.putLongArray(ARG_PRESELECTED_KEY_IDS, preselectedKeyIds); frag.setArguments(args); return frag; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mSelectedMasterKeyIds = getArguments().getLongArray(ARG_PRESELECTED_KEY_IDS); } /** * Define Adapter and Loader on create of Activity */ @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mActivity = getSherlockActivity(); mListView = getListView(); mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); // Give some text to display if there is no data. In a real // application this would come from a resource. setEmptyText(getString(R.string.list_empty)); // mAdapter = new SelectKeyCursorAdapter(mActivity, null, 0, mListView, Id.type.public_key); mAdapter = new SelectKeyCursorAdapter(mActivity, null, 0, mListView, 0x21070001); setListAdapter(mAdapter); // Start out with a progress indicator. setListShown(false); // Prepare the loader. Either re-connect with an existing one, // or start a new one. getLoaderManager().initLoader(0, null, this); } /** * Selects items based on master key ids in list view * * @param masterKeyIds */ private void preselectMasterKeyIds(long[] masterKeyIds) { if (masterKeyIds != null) { for (int i = 0; i < mListView.getCount(); ++i) { long keyId = mAdapter.getMasterKeyId(i); for (int j = 0; j < masterKeyIds.length; ++j) { if (keyId == masterKeyIds[j]) { mListView.setItemChecked(i, true); break; } } } } } /** * Returns all selected master key ids * * @return */ public long[] getSelectedMasterKeyIds() { // mListView.getCheckedItemIds() would give the row ids of the KeyRings not the master key // ids! Vector<Long> vector = new Vector<Long>(); for (int i = 0; i < mListView.getCount(); ++i) { if (mListView.isItemChecked(i)) { vector.add(mAdapter.getMasterKeyId(i)); } } // convert to long array long[] selectedMasterKeyIds = new long[vector.size()]; for (int i = 0; i < vector.size(); ++i) { selectedMasterKeyIds[i] = vector.get(i); } return selectedMasterKeyIds; } /** * Returns all selected user ids * * @return */ public String[] getSelectedUserIds() { Vector<String> userIds = new Vector<String>(); for (int i = 0; i < mListView.getCount(); ++i) { if (mListView.isItemChecked(i)) { userIds.add((String) mAdapter.getUserId(i)); } } // make empty array to not return null String userIdArray[] = new String[0]; return userIds.toArray(userIdArray); } @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(); // These are the rows that we will retrieve. long now = new Date().getTime() / 1000; String[] projection = new String[] { KeyRings._ID, KeyRings.MASTER_KEY_ID, UserIds.USER_ID, "(SELECT COUNT(available_keys." + Keys._ID + ") FROM " + Tables.KEYS + " AS available_keys WHERE available_keys." + Keys.KEY_RING_ROW_ID + " = " + KeychainDatabase.Tables.KEY_RINGS + "." + KeyRings._ID + " AND available_keys." + Keys.IS_REVOKED + " = '0' AND available_keys." + Keys.CAN_ENCRYPT + " = '1') AS " + SelectKeyCursorAdapter.PROJECTION_ROW_AVAILABLE, "(SELECT COUNT(valid_keys." + Keys._ID + ") FROM " + Tables.KEYS + " AS valid_keys WHERE valid_keys." + Keys.KEY_RING_ROW_ID + " = " + KeychainDatabase.Tables.KEY_RINGS + "." + KeyRings._ID + " AND valid_keys." + Keys.IS_REVOKED + " = '0' AND valid_keys." + Keys.CAN_ENCRYPT + " = '1' AND valid_keys." + Keys.CREATION + " <= '" + now + "' AND " + "(valid_keys." + Keys.EXPIRY + " IS NULL OR valid_keys." + Keys.EXPIRY + " >= '" + now + "')) AS " + SelectKeyCursorAdapter.PROJECTION_ROW_VALID, }; String inMasterKeyList = null; if (mSelectedMasterKeyIds != null && mSelectedMasterKeyIds.length > 0) { inMasterKeyList = KeyRings.MASTER_KEY_ID + " IN ("; for (int i = 0; i < mSelectedMasterKeyIds.length; ++i) { if (i != 0) { inMasterKeyList += ", "; } inMasterKeyList += DatabaseUtils.sqlEscapeString("" + mSelectedMasterKeyIds[i]); } inMasterKeyList += ")"; } // if (searchString != null && searchString.trim().length() > 0) { // String[] chunks = searchString.trim().split(" +"); // qb.appendWhere("(EXISTS (SELECT tmp." + UserIds._ID + " FROM " + UserIds.TABLE_NAME // + " AS tmp WHERE " + "tmp." + UserIds.KEY_ID + " = " + Keys.TABLE_NAME + "." // + Keys._ID); // for (int i = 0; i < chunks.length; ++i) { // qb.appendWhere(" AND tmp." + UserIds.USER_ID + " LIKE "); // qb.appendWhereEscapeString("%" + chunks[i] + "%"); // } // qb.appendWhere("))"); // // if (inIdList != null) { // qb.appendWhere(" OR (" + inIdList + ")"); // } // } String orderBy = UserIds.USER_ID + " ASC"; if (inMasterKeyList != null) { // sort by selected master keys orderBy = inMasterKeyList + " DESC, " + orderBy; } // 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, null, null, orderBy); } @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); // The list should now be shown. if (isResumed()) { setListShown(true); } else { setListShownNoAnimation(true); } // preselect given master keys preselectMasterKeyIds(mSelectedMasterKeyIds); } @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); } }