Java tutorial
/******************************************************************************* * Copyright (C) 2013 The Android Money Manager Ex Project * * 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 2 * 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. ******************************************************************************/ package com.money.manager.ex.reports; import java.util.Calendar; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.CursorAdapter; import android.view.View; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.money.manager.ex.R; import com.money.manager.ex.database.SQLDataSet; import com.money.manager.ex.database.ViewMobileData; import com.money.manager.ex.fragment.BaseListFragment; public abstract class BaseReportFragment extends BaseListFragment implements LoaderCallbacks<Cursor> { protected static final int ID_LOADER = 1; protected static final String KEY_ITEM_SELECTED = "PayeeReportFragment:ItemSelected"; protected static final String KEY_WHERE_CLAUSE = "PayeeReportFragment:WhereClause"; protected int mItemSelected = R.id.menu_all_time; protected String mWhereClause = null; protected View addListViewHeaderFooter(int layout) { return View.inflate(getActivity(), layout, null); } protected String getWhereClause() { return mWhereClause; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); //set listview setHasOptionsMenu(true); setEmptyText(getString(R.string.no_data)); setListShown(false); //item selected if (savedInstanceState != null && savedInstanceState.containsKey(KEY_ITEM_SELECTED)) { mItemSelected = savedInstanceState.getInt(KEY_ITEM_SELECTED); } //start loader startLoader(savedInstanceState); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { switch (id) { case ID_LOADER: if (args != null && args.containsKey(KEY_WHERE_CLAUSE)) { setWhereClause(args.getString(KEY_WHERE_CLAUSE)); } return new CursorLoader(getActivity(), new SQLDataSet().getUri(), null, prepareQuery(getWhereClause()), null, null); } return null; } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); //inflate menu inflater.inflate(R.menu.menu_report, menu); //checked item MenuItem item = menu.findItem(mItemSelected); if (item != null) { item.setChecked(true); } } @Override public void onLoaderReset(Loader<Cursor> loader) { switch (loader.getId()) { case ID_LOADER: ((CursorAdapter) getListAdapter()).swapCursor(null); } } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { switch (loader.getId()) { case ID_LOADER: ((CursorAdapter) getListAdapter()).swapCursor(data); if (isResumed()) { setListShown(true); } else { setListShownNoAnimation(true); } break; } } @Override public boolean onOptionsItemSelected(MenuItem item) { String whereClause = null; int currentMonth = Calendar.getInstance().get(Calendar.MONTH) + 1; int currentYear = Calendar.getInstance().get(Calendar.YEAR); //quick-fix convert 'switch' to 'if-else' if (item.getItemId() == R.id.menu_current_month) { whereClause = ViewMobileData.Month + "=" + Integer.toString(currentMonth) + " AND " + ViewMobileData.Year + "=" + Integer.toString(currentYear); } else if (item.getItemId() == R.id.menu_last_month) { if (currentMonth == 1) { whereClause = ViewMobileData.Month + "=" + Integer.toString(12) + " AND " + ViewMobileData.Year + "=" + Integer.toString(currentYear - 1); } else { whereClause = ViewMobileData.Month + "=" + Integer.toString(currentMonth - 1) + " AND " + ViewMobileData.Year + "=" + Integer.toString(currentYear); } } else if (item.getItemId() == R.id.menu_last_30_days) { whereClause = "(julianday(date('now')) - julianday(" + ViewMobileData.Date + ") <= 30)"; } else if (item.getItemId() == R.id.menu_current_year) { whereClause = ViewMobileData.Year + "=" + Integer.toString(currentYear); } else if (item.getItemId() == R.id.menu_last_year) { whereClause = ViewMobileData.Year + "=" + Integer.toString(currentYear - 1); } else if (item.getItemId() == R.id.menu_all_time) { } else { return super.onOptionsItemSelected(item); } //check item item.setChecked(true); mItemSelected = item.getItemId(); //compose bundle Bundle args = new Bundle(); args.putString(KEY_WHERE_CLAUSE, whereClause); //starts loader startLoader(args); return true; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(KEY_ITEM_SELECTED, mItemSelected); outState.putString(KEY_WHERE_CLAUSE, getWhereClause()); } /** * Prepare SQL query to execute in content provider * @param whereClause * @return */ protected abstract String prepareQuery(String whereClause); protected void setWhereClause(String mWhereClause) { this.mWhereClause = mWhereClause; } /** * Start loader with arguments * @param args */ protected void startLoader(Bundle args) { getLoaderManager().restartLoader(ID_LOADER, args, this); } }