Java tutorial
/* * Copyright (C) 2012-2013 Dominik Schrmann <dominik@dominikschuermann.de> * Copyright (C) 2010-2014 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 org.thialfihar.android.apg.ui; import android.content.Context; 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.text.Editable; import android.text.TextUtils; import android.text.TextWatcher; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import org.thialfihar.android.apg.Id; import org.thialfihar.android.apg.R; import org.thialfihar.android.apg.compatibility.ListFragmentWorkaround; import org.thialfihar.android.apg.provider.KeychainContract.KeyRings; import org.thialfihar.android.apg.provider.KeychainContract.Keys; import org.thialfihar.android.apg.provider.KeychainContract.UserIds; import org.thialfihar.android.apg.provider.KeychainDatabase; import org.thialfihar.android.apg.provider.KeychainDatabase.Tables; import org.thialfihar.android.apg.ui.adapter.SelectKeyCursorAdapter; import java.util.Date; import java.util.Vector; public class SelectPublicKeyFragment extends ListFragmentWorkaround implements TextWatcher, LoaderManager.LoaderCallbacks<Cursor> { public static final String ARG_PRESELECTED_KEY_IDS = "preselected_key_ids"; private SelectKeyCursorAdapter mAdapter; private EditText mSearchView; private long mSelectedMasterKeyIds[]; private String mCurQuery; // copied from ListFragment static final int INTERNAL_EMPTY_ID = 0x00ff0001; static final int INTERNAL_PROGRESS_CONTAINER_ID = 0x00ff0002; static final int INTERNAL_LIST_CONTAINER_ID = 0x00ff0003; // added for search view static final int SEARCH_ID = 0x00ff0004; /** * 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); } /** * Copied from ListFragment and added EditText for search on top of list. * We do not use a custom layout here, because this breaks the progress bar functionality * of ListFragment. * * @param inflater * @param container * @param savedInstanceState * @return */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final Context context = getActivity(); FrameLayout root = new FrameLayout(context); // ------------------------------------------------------------------ LinearLayout pframe = new LinearLayout(context); pframe.setId(INTERNAL_PROGRESS_CONTAINER_ID); pframe.setOrientation(LinearLayout.VERTICAL); pframe.setVisibility(View.GONE); pframe.setGravity(Gravity.CENTER); ProgressBar progress = new ProgressBar(context, null, android.R.attr.progressBarStyleLarge); pframe.addView(progress, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); root.addView(pframe, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); // ------------------------------------------------------------------ FrameLayout lframe = new FrameLayout(context); lframe.setId(INTERNAL_LIST_CONTAINER_ID); TextView tv = new TextView(getActivity()); tv.setId(INTERNAL_EMPTY_ID); tv.setGravity(Gravity.CENTER); lframe.addView(tv, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); // Added for search view: linearLayout, mSearchView LinearLayout linearLayout = new LinearLayout(context); linearLayout.setOrientation(LinearLayout.VERTICAL); mSearchView = new EditText(context); mSearchView.setId(SEARCH_ID); mSearchView.setHint(R.string.menu_search); mSearchView.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.ic_action_search), null, null, null); linearLayout.addView(mSearchView, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); ListView lv = new ListView(getActivity()); lv.setId(android.R.id.list); lv.setDrawSelectorOnTop(false); linearLayout.addView(lv, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); lframe.addView(linearLayout, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); root.addView(lframe, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); // ------------------------------------------------------------------ root.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); return root; } /** * Define Adapter and Loader on create of Activity */ @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getListView().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)); mSearchView.addTextChangedListener(this); mAdapter = new SelectKeyCursorAdapter(getActivity(), null, 0, getListView(), Id.type.public_key); 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 < getListView().getCount(); ++i) { long keyId = mAdapter.getMasterKeyId(i); for (long masterKeyId : masterKeyIds) { if (keyId == masterKeyId) { getListView().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 < getListView().getCount(); ++i) { if (getListView().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 < getListView().getCount(); ++i) { if (getListView().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 += ")"; } String orderBy = UserIds.USER_ID + " ASC"; if (inMasterKeyList != null) { // sort by selected master keys orderBy = inMasterKeyList + " DESC, " + orderBy; } String where = null; String whereArgs[] = null; if (mCurQuery != null) { where = 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, 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.setSearchQuery(mCurQuery); 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); } @Override public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) { } @Override public void afterTextChanged(Editable editable) { mCurQuery = !TextUtils.isEmpty(editable.toString()) ? editable.toString() : null; getLoaderManager().restartLoader(0, null, this); } }