Java tutorial
<<<<<<< HEAD /* * Copyright 2016. Suhail Purkar * * 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. */ ======= >>>>>>> d17ac89ab3e588150d3e7078a920816832fae901 package com.suhailpurkar.android.stockhawk; import android.database.Cursor; import android.graphics.Color; import android.os.Bundle; import android.support.annotation.Nullable; 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.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TabHost; import android.widget.TextView; import com.suhailpurkar.android.stockhawk.data.QuoteColumns; import com.suhailpurkar.android.stockhawk.data.QuoteHistoricalDataColumns; import com.suhailpurkar.android.stockhawk.data.QuoteProvider; import java.util.ArrayList; import java.util.List; import butterknife.Bind; import butterknife.ButterKnife; import lecho.lib.hellocharts.model.Axis; import lecho.lib.hellocharts.model.AxisValue; import lecho.lib.hellocharts.model.Line; import lecho.lib.hellocharts.model.LineChartData; import lecho.lib.hellocharts.model.PointValue; import lecho.lib.hellocharts.view.LineChartView; /** * A fragment representing a single Stock detail screen. * This fragment is either contained in a {@link StockListActivity} * in two-pane mode (on tablets) or a {@link StockDetailActivity} * on handsets. */ public class StockDetailFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, TabHost.OnTabChangeListener { @SuppressWarnings("unused") public static String LOG_TAG = StockDetailFragment.class.getSimpleName(); public static final String ARG_SYMBOL = "ARG_SYMBOL"; public static final String EXTRA_CURRENT_TAB = "EXTRA_CURRENT_TAB"; private static final int CURSOR_LOADER_ID = 1; private static final int CURSOR_LOADER_ID_FOR_LINE_CHART = 2; private String mSymbol; private String mSelectedTab; @Bind(R.id.stock_name) TextView mNameView; @Bind(R.id.stock_symbol) TextView mSymbolView; @Bind(R.id.stock_bidprice) TextView mEbitdaView; @Bind(android.R.id.tabhost) TabHost mTabHost; @Bind(R.id.stock_chart) LineChartView mChart; @Bind(R.id.stock_change) TextView mChange; @Bind(android.R.id.tabcontent) View mTabContent; public StockDetailFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments().containsKey(ARG_SYMBOL)) { mSymbol = getArguments().getString(ARG_SYMBOL); } if (getActionBar() != null) { getActionBar().setElevation(0); if (getActivity() instanceof StockDetailActivity) { getActionBar().setTitle(""); } } if (savedInstanceState == null) { mSelectedTab = getString(R.string.stock_detail_tab1); } else { mSelectedTab = savedInstanceState.getString(EXTRA_CURRENT_TAB); } getLoaderManager().initLoader(CURSOR_LOADER_ID, null, this); getLoaderManager().initLoader(CURSOR_LOADER_ID_FOR_LINE_CHART, null, this); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.stock_detail, container, false); ButterKnife.bind(this, rootView); setupTabs(); return rootView; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString(EXTRA_CURRENT_TAB, mSelectedTab); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { if (id == CURSOR_LOADER_ID) { return new CursorLoader(getContext(), QuoteProvider.Quotes.CONTENT_URI, new String[]{QuoteColumns._ID, QuoteColumns.SYMBOL, QuoteColumns.BIDPRICE, QuoteColumns.PERCENT_CHANGE, QuoteColumns.CHANGE, QuoteColumns.ISUP, QuoteColumns.NAME}, QuoteColumns.SYMBOL + " = \"" + mSymbol + "\"", null, null); } else if (id == CURSOR_LOADER_ID_FOR_LINE_CHART) { String sortOrder = QuoteColumns._ID + " ASC LIMIT 5"; if (mSelectedTab.equals(getString(R.string.stock_detail_tab2))) { sortOrder = QuoteColumns._ID + " ASC LIMIT 14"; } else if (mSelectedTab.equals(getString(R.string.stock_detail_tab3))) { sortOrder = QuoteColumns._ID + " ASC"; } return new CursorLoader(getContext(), QuoteProvider.QuotesHistoricData.CONTENT_URI, new String[]{QuoteHistoricalDataColumns._ID, QuoteHistoricalDataColumns.SYMBOL, QuoteHistoricalDataColumns.BIDPRICE, QuoteHistoricalDataColumns.DATE}, QuoteHistoricalDataColumns.SYMBOL + " = \"" + mSymbol + "\"", null, sortOrder); } else { throw new IllegalStateException(); } } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { if (loader.getId() == CURSOR_LOADER_ID && data != null && data.moveToFirst()) { String symbol = data.getString(data.getColumnIndex(QuoteColumns.SYMBOL)); mSymbolView.setText(getString(R.string.stock_detail_tab_header, symbol)); String ebitda = data.getString(data.getColumnIndex(QuoteColumns.BIDPRICE)); mEbitdaView.setText(ebitda); String name = data.getString(data.getColumnIndex(QuoteColumns.NAME)); mNameView.setText(name); String change = data.getString(data.getColumnIndex(QuoteColumns.CHANGE)); String percentChange = data.getString(data.getColumnIndex(QuoteColumns.PERCENT_CHANGE)); String mixedChange = change + " (" + percentChange + ")"; mChange.setText(mixedChange); } else if (loader.getId() == CURSOR_LOADER_ID_FOR_LINE_CHART && data != null && data.moveToFirst()) { updateChart(data); } } @Override public void onLoaderReset(Loader<Cursor> loader) { // Nothing to do } @Override public void onTabChanged(String tabId) { mSelectedTab = tabId; getLoaderManager().restartLoader(CURSOR_LOADER_ID_FOR_LINE_CHART, null, this); } @Nullable private ActionBar getActionBar() { if (getActivity() instanceof AppCompatActivity) { AppCompatActivity activity = (AppCompatActivity) getActivity(); return activity.getSupportActionBar(); } return null; } private void setupTabs() { mTabHost.setup(); TabHost.TabSpec tabSpec; tabSpec = mTabHost.newTabSpec(getString(R.string.stock_detail_tab1)); tabSpec.setIndicator(getString(R.string.stock_detail_tab1)); tabSpec.setContent(android.R.id.tabcontent); mTabHost.addTab(tabSpec); tabSpec = mTabHost.newTabSpec(getString(R.string.stock_detail_tab2)); tabSpec.setIndicator(getString(R.string.stock_detail_tab2)); tabSpec.setContent(android.R.id.tabcontent); mTabHost.addTab(tabSpec); tabSpec = mTabHost.newTabSpec(getString(R.string.stock_detail_tab3)); tabSpec.setIndicator(getString(R.string.stock_detail_tab3)); tabSpec.setContent(android.R.id.tabcontent); mTabHost.addTab(tabSpec); mTabHost.setOnTabChangedListener(this); if (mSelectedTab.equals(getString(R.string.stock_detail_tab2))) { mTabHost.setCurrentTab(1); } else if (mSelectedTab.equals(getString(R.string.stock_detail_tab3))) { mTabHost.setCurrentTab(2); } else { mTabHost.setCurrentTab(0); } } private void updateChart(Cursor data) { List<AxisValue> axisValuesX = new ArrayList<>(); List<PointValue> pointValues = new ArrayList<>(); int counter = -1; do { counter++; String date = data.getString(data.getColumnIndex( QuoteHistoricalDataColumns.DATE)); String bidPrice = data.getString(data.getColumnIndex( QuoteHistoricalDataColumns.BIDPRICE)); // We have to show chart in right order. int x = data.getCount() - 1 - counter; // Point for line chart (date, price). PointValue pointValue = new PointValue(x, Float.valueOf(bidPrice)); pointValue.setLabel(date); pointValues.add(pointValue); // Set labels for x-axis (we have to reduce its number to avoid overlapping text). if (counter != 0 && counter % (data.getCount() / 3) == 0) { AxisValue axisValueX = new AxisValue(x); axisValueX.setLabel(date); axisValuesX.add(axisValueX); } } while (data.moveToNext()); // Prepare data for chart Line line = new Line(pointValues).setColor(Color.WHITE).setCubic(false); List<Line> lines = new ArrayList<>(); lines.add(line); LineChartData lineChartData = new LineChartData(); lineChartData.setLines(lines); // Init x-axis Axis axisX = new Axis(axisValuesX); axisX.setHasLines(true); axisX.setMaxLabelChars(4); lineChartData.setAxisXBottom(axisX); // Init y-axis Axis axisY = new Axis(); axisY.setAutoGenerated(true); axisY.setHasLines(true); axisY.setMaxLabelChars(4); lineChartData.setAxisYLeft(axisY); // Update chart with new data. mChart.setInteractive(false); mChart.setLineChartData(lineChartData); // Show chart mChart.setVisibility(View.VISIBLE); mTabContent.setVisibility(View.VISIBLE); } }