Java tutorial
/* * Copyright (c) 2015 Oleksandr Tyshkovets <olexandr.tyshkovets@gmail.com> * * 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.gnucash.android.ui.chart; import android.graphics.Color; import android.os.Bundle; import android.preference.PreferenceManager; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.LinearLayout; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; import com.github.mikephil.charting.charts.BarChart; import com.github.mikephil.charting.components.Legend; import com.github.mikephil.charting.data.BarData; import com.github.mikephil.charting.data.BarDataSet; import com.github.mikephil.charting.data.BarEntry; import com.github.mikephil.charting.data.Entry; import com.github.mikephil.charting.listener.OnChartValueSelectedListener; import com.github.mikephil.charting.utils.Highlight; import com.github.mikephil.charting.utils.LargeValueFormatter; import org.gnucash.android.R; import org.gnucash.android.db.AccountsDbAdapter; import org.gnucash.android.db.TransactionsDbAdapter; import org.gnucash.android.model.Account; import org.gnucash.android.model.AccountType; import org.gnucash.android.model.Money; import org.gnucash.android.ui.passcode.PassLockActivity; import org.joda.time.LocalDate; import org.joda.time.LocalDateTime; import org.joda.time.Months; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Currency; import java.util.LinkedHashMap; import java.util.LinkedHashSet; import java.util.List; import java.util.Locale; import java.util.Map; /** * Activity used for drawing a bar chart * * @author Oleksandr Tyshkovets <olexandr.tyshkovets@gmail.com> */ public class BarChartActivity extends PassLockActivity implements OnChartValueSelectedListener { private static final String TAG = "BarChartActivity"; private static final String X_AXIS_PATTERN = "MMM YY"; private static final String SELECTED_VALUE_PATTERN = "%s - %.2f (%.2f %%)"; private static final int ANIMATION_DURATION = 3000; private static final int NO_DATA_COLOR = Color.LTGRAY; private static final int NO_DATA_BAR_COUNTS = 3; private static final int[] COLORS = { Color.parseColor("#17ee4e"), Color.parseColor("#cc1f09"), Color.parseColor("#3940f7"), Color.parseColor("#f9cd04"), Color.parseColor("#5f33a8"), Color.parseColor("#e005b6"), Color.parseColor("#17d6ed"), Color.parseColor("#e4a9a2"), Color.parseColor("#8fe6cd"), Color.parseColor("#8b48fb"), Color.parseColor("#343a36"), Color.parseColor("#6decb1"), Color.parseColor("#a6dcfd"), Color.parseColor("#5c3378"), Color.parseColor("#a6dcfd"), Color.parseColor("#ba037c"), Color.parseColor("#708809"), Color.parseColor("#32072c"), Color.parseColor("#fddef8"), Color.parseColor("#fa0e6e"), Color.parseColor("#d9e7b5") }; private AccountsDbAdapter mAccountsDbAdapter = AccountsDbAdapter.getInstance(); private TextView selectedValueTextView; private BarChart mChart; private Currency mCurrency; private boolean mUseAccountColor = true; private boolean mTotalPercentageMode = true; private boolean mChartDataPresent = true; @Override protected void onCreate(Bundle savedInstanceState) { //it is necessary to set the view first before calling super because of the nav drawer in BaseDrawerActivity setContentView(R.layout.activity_bar_chart); super.onCreate(savedInstanceState); getSupportActionBar().setTitle(R.string.title_bar_chart); selectedValueTextView = (TextView) findViewById(R.id.selected_chart_slice); mUseAccountColor = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()) .getBoolean(getString(R.string.key_use_account_color), false); mCurrency = Currency.getInstance(PreferenceManager.getDefaultSharedPreferences(this) .getString(getString(R.string.key_report_currency), Money.DEFAULT_CURRENCY_CODE)); mChart = new BarChart(this); ((LinearLayout) findViewById(R.id.bar_chart)).addView(mChart); mChart.setOnChartValueSelectedListener(this); mChart.setDescription(""); mChart.setDrawValuesForWholeStack(false); mChart.getXAxis().setDrawGridLines(false); mChart.getAxisRight().setEnabled(false); mChart.getAxisLeft().enableGridDashedLine(4.0f, 4.0f, 0); mChart.getAxisLeft().setValueFormatter(new LargeValueFormatter(mCurrency.getSymbol(Locale.getDefault()))); mChart.getLegend().setForm(Legend.LegendForm.CIRCLE); mChart.getLegend().setPosition(Legend.LegendPosition.RIGHT_OF_CHART_INSIDE); setUpSpinner(); } /** * Returns a data object that represents a user data of the specified account types * @param accountType account's type which will be displayed * @return a {@code BarData} instance that represents a user data */ private BarData getData(AccountType accountType) { List<BarEntry> values = new ArrayList<>(); List<String> labels = new ArrayList<>(); List<Integer> colors = new ArrayList<>(); Map<String, Integer> accountToColorMap = new LinkedHashMap<>(); List<String> xValues = new ArrayList<>(); LocalDateTime tmpDate = new LocalDateTime(getStartDate(accountType).toDate().getTime()); for (int i = 0; i <= Months.monthsBetween(getStartDate(accountType), getEndDate(accountType)) .getMonths(); i++) { long start = tmpDate.dayOfMonth().withMinimumValue().millisOfDay().withMinimumValue().toDate() .getTime(); long end = tmpDate.dayOfMonth().withMaximumValue().millisOfDay().withMaximumValue().toDate().getTime(); List<Float> stack = new ArrayList<>(); for (Account account : mAccountsDbAdapter.getSimpleAccountList()) { if (account.getAccountType() == accountType && !account.isPlaceholderAccount() && account.getCurrency() == mCurrency) { double balance = mAccountsDbAdapter .getAccountsBalance(Collections.singletonList(account.getUID()), start, end).asDouble(); if (balance != 0) { if (!accountToColorMap.containsKey(account.getUID())) { Integer color; if (mUseAccountColor) { color = (account.getColorHexCode() != null) ? Color.parseColor(account.getColorHexCode()) : COLORS[accountToColorMap.size() % COLORS.length]; } else { color = COLORS[accountToColorMap.size() % COLORS.length]; } accountToColorMap.put(account.getUID(), color); } stack.add((float) balance); labels.add(account.getName()); colors.add(accountToColorMap.get(account.getUID())); Log.d(TAG, accountType + tmpDate.toString(" MMMM yyyy ") + account.getName() + " = " + stack.get(stack.size() - 1)); } } } String stackLabels = labels.subList(labels.size() - stack.size(), labels.size()).toString(); values.add(new BarEntry(floatListToArray(stack), i, stackLabels)); xValues.add(tmpDate.toString(X_AXIS_PATTERN)); tmpDate = tmpDate.plusMonths(1); } BarDataSet set = new BarDataSet(values, ""); set.setStackLabels(labels.toArray(new String[labels.size()])); set.setColors(colors); if (set.getYValueSum() == 0) { mChartDataPresent = false; return getEmptyData(); } mChartDataPresent = true; return new BarData(xValues, set); } /** * Returns a data object that represents situation when no user data available * @return a {@code BarData} instance for situation when no user data available */ private BarData getEmptyData() { List<String> xValues = new ArrayList<>(); List<BarEntry> yValues = new ArrayList<>(); for (int i = 0; i < NO_DATA_BAR_COUNTS; i++) { xValues.add(""); yValues.add(new BarEntry(i + 1, i)); } BarDataSet set = new BarDataSet(yValues, getResources().getString(R.string.label_chart_no_data)); set.setDrawValues(false); set.setColor(NO_DATA_COLOR); return new BarData(xValues, set); } /** * Returns the start data of x-axis for the specified account type * @param accountType account type * @return the start data */ private LocalDate getStartDate(AccountType accountType) { TransactionsDbAdapter adapter = TransactionsDbAdapter.getInstance(); String code = mCurrency.getCurrencyCode(); LocalDate startDate = new LocalDate(adapter.getTimestampOfEarliestTransaction(accountType, code)) .withDayOfMonth(1); Log.d(TAG, accountType + " X-axis star date: " + startDate.toString("dd MM yyyy")); return startDate; } /** * Returns the end data of x-axis for the specified account type * @param accountType account type * @return the end data */ private LocalDate getEndDate(AccountType accountType) { TransactionsDbAdapter adapter = TransactionsDbAdapter.getInstance(); String code = mCurrency.getCurrencyCode(); LocalDate endDate = new LocalDate(adapter.getTimestampOfLatestTransaction(accountType, code)) .withDayOfMonth(1); Log.d(TAG, accountType + " X-axis end date: " + endDate.toString("dd MM yyyy")); return endDate; } /** * Converts the specified list of floats to an array * @param list a list of floats * @return a float array */ private float[] floatListToArray(List<Float> list) { float array[] = new float[list.size()]; for (int i = 0; i < list.size(); i++) { array[i] = list.get(i); } return array; } /** * Sets up settings and data for the account type spinner. Currently used only {@code EXPENSE} and {@code INCOME} * account types. */ private void setUpSpinner() { final Spinner spinner = (Spinner) findViewById(R.id.chart_data_spinner); ArrayAdapter<AccountType> dataAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, Arrays.asList(AccountType.EXPENSE, AccountType.INCOME)); dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(dataAdapter); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { mChart.setData(getData((AccountType) spinner.getSelectedItem())); displayChart(); } @Override public void onNothingSelected(AdapterView<?> adapterView) { } }); } /** * Displays the stacked bar chart */ private void displayChart() { mChart.highlightValues(null); mChart.getLegend().setEnabled(false); mChart.getAxisLeft().setDrawLabels(mChartDataPresent); mChart.getXAxis().setDrawLabels(mChartDataPresent); mChart.setTouchEnabled(mChartDataPresent); selectedValueTextView.setText(""); if (mChartDataPresent) { mChart.animateY(ANIMATION_DURATION); } else { mChart.clearAnimation(); selectedValueTextView.setText(getResources().getString(R.string.label_chart_no_data)); } mChart.invalidate(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getSupportMenuInflater().inflate(R.menu.chart_actions, menu); return true; } @Override public boolean onPrepareOptionsMenu(Menu menu) { menu.findItem(R.id.menu_percentage_mode).setVisible(mChartDataPresent); // hide pie/line chart specific menu items menu.findItem(R.id.menu_order_by_size).setVisible(false); menu.findItem(R.id.menu_toggle_labels).setVisible(false); menu.findItem(R.id.menu_toggle_average_lines).setVisible(false); menu.findItem(R.id.menu_group_other_slice).setVisible(false); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_toggle_legend: // workaround for buggy legend Legend legend = mChart.getLegend(); legend.setEnabled(!mChart.getLegend().isEnabled()); BarDataSet dataSet = mChart.getData().getDataSetByIndex(0); LinkedHashSet<String> labels = new LinkedHashSet<>(Arrays.asList(dataSet.getStackLabels())); legend.setLabels(labels.toArray(new String[labels.size()])); LinkedHashSet<Integer> colors = new LinkedHashSet<>(dataSet.getColors()); legend.setColors(Arrays.asList(colors.toArray(new Integer[colors.size()]))); mChart.invalidate(); break; case R.id.menu_percentage_mode: mTotalPercentageMode = !mTotalPercentageMode; int msgId = mTotalPercentageMode ? R.string.toast_chart_percentage_mode_total : R.string.toast_chart_percentage_mode_current_bar; Toast.makeText(this, msgId, Toast.LENGTH_LONG).show(); break; case android.R.id.home: finish(); break; } return true; } @Override public void onValueSelected(Entry e, int dataSetIndex, Highlight h) { if (e == null || ((BarEntry) e).getVals().length == 0) return; BarEntry entry = (BarEntry) e; int index = h.getStackIndex() == -1 ? 0 : h.getStackIndex(); String stackLabels = entry.getData().toString(); String label = mChart.getData().getXVals().get(entry.getXIndex()) + ", " + stackLabels.substring(1, stackLabels.length() - 1).split(",")[index]; double value = entry.getVals()[index]; double sum = mTotalPercentageMode ? mChart.getData().getDataSetByIndex(dataSetIndex).getYValueSum() : entry.getVal(); selectedValueTextView.setText(String.format(SELECTED_VALUE_PATTERN, label, value, value / sum * 100)); } @Override public void onNothingSelected() { selectedValueTextView.setText(""); } }