Hellocharts-android open-source chart Library (I) line chart, hellocharts

Hellocharts-android open-source chart Library (I) line chart, hellocharts
1. 2. source code MainActivity. java public class MainActivity extends AppCompatActivity {public enum ChartType {LINE_CHART, COLUMN_CHART, PIE_CHART, BUBBLE_CHART, charts, PREVIEW_COLUMN_CHART, OTHER} @ Override protected void onCreate (Bundle limit) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); if (savedInstanceState = null) {getSupportFragmentManager (). beginTransaction (). add (R. id. container, new PlaceholderFragment ()). commit () ;}} public static class PlaceholderFragment extends Fragment implements AdapterView. onItemClickListener {private ListView listView; private ChartSamplesAdapter adapter; public Preview () {}@ Override public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {View rootView = inflater. inflate (R. layout. fragment_main, container, false); listView = (ListView) rootView. findViewById (android. r. id. list); adapter = new ChartSamplesAdapter (getActivity (), 0, generateSamplesDescriptions (); listView. setAdapter (adapter); listView. setOnItemClickListener (this); return rootView;} @ Override public void onItemClick (AdapterView Adapter, View view, int position, long id) {Intent intent; switch (position) {case 0: // Line Chart; intent = new Intent (getActivity (), LineChartActivity. class); startActivity (intent); break; case 1: // Column Chart; intent = new Intent (getActivity (), ColumnChartActivity. class); startActivity (intent); break; case 2: // Pie Chart; intent = new Intent (getActivity (), PieChartActivity. class); startActivity (intent); break; default: break;} private List GenerateSamplesDescriptions () {List List = new ArrayList (); List. add (new ChartSampleDescription ("Line Chart", "This is Line Chart", ChartType. LINE_CHART); list. add (new ChartSampleDescription ("Column Chart", "This is Column chart", ChartType. COLUMN_CHART); list. add (new ChartSampleDescription ("Pie Chart", "This is Pie Chart", ChartType. PIE_CHART); return list;} public static class ChartSamplesAdapter extends ArrayAdapter {Public ChartSamplesAdapter (Context context, int resource, List Objects) {super (context, resource, objects) ;}@ Override public View getView (int position, View convertView, ViewGroup parent) {ViewHolder holder; if (convertView = null) {convertView = View. inflate (getContext (), R. layout. list_item_sample, null); holder = new ViewHolder (); holder. text1 = (TextView) convertView. findViewById (R. id. text1); holder. text2 = (TextView) convertView. findViewById (R. id. tex T2); holder. chartLayout = (FrameLayout) convertView. findViewById (R. id. chart_layout); convertView. setTag (holder);} else {holder = (ViewHolder) convertView. getTag ();} ChartSampleDescription item = getItem (position); holder. chartLayout. setVisibility (View. VISIBLE); holder. chartLayout. removeAllViews (); AbstractChartView chart; switch (item. chartType) {case LINE_CHART: chart = new LineChartView (getC Ontext (); holder. chartLayout. addView (chart); break; case COLUMN_CHART: chart = new ColumnChartView (getContext (); holder. chartLayout. addView (chart); break; case PIE_CHART: chart = new PieChartView (getContext (); holder. chartLayout. addView (chart); break; case BUBBLE_CHART: chart = new BubbleChartView (getContext (); holder. chartLayout. addView (chart); break; default: chart = null; holder. chartLayout. SetVisibility (View. GONE); break;} if (null! = Chart) {chart. setInteractive (false); // Disable touch handling for chart on the ListView .} holder. text1.setText (item. text1); holder. text2.setText (item. text2); return convertView;} private class ViewHolder {TextView text1; TextView text2; invalid chartLayout ;}} public static class ChartSampleDescription {String text1; String text2; ChartType chartType; public ChartSampleDescription (Strin G text1, String text2, ChartType chartType) {this. text1 = text1; this. text2 = text2; this. chartType = chartType ;}} LineChartActivity. java public class LineChartActivity extends AppCompatActivity {@ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_line_chart); if (savedInstanceState = null) {getSupportFragmentM Anager (). beginTransaction (). add (R. id. container, new PlaceholderFragment ()). commit () ;}/ *** A fragment containing a line chart. */public static class PlaceholderFragment extends Fragment {private LineChartView chart; private LineChartData data; private int numberOfLines = 1; private int maxNumberOfLines = 4; private int numberOfPoints = 12; float [] [] randomNumbersTab = new float [maxNumberOfLi Nes] [numberOfPoints]; private boolean hasAxes = true; private boolean hasAxesNames = true; private boolean hasLines = true; private boolean hasPoints = true; private ValueShape shape = ValueShape. CIRCLE; private boolean isFilled = false; private boolean hasLabels = false; private boolean isCubic = false; private boolean hasLabelForSelected = false; private boolean pointsHaveDifferentColor; public PlaceholderFragment () {}@ Override public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {setHasOptionsMenu (true); View rootView = inflater. inflate (R. layout. fragment_line_chart, container, false); chart = (LineChartView) rootView. findViewById (R. id. chart); chart. setOnValueTouchListener (new ValueTouchListener (); // generate some random values. GenerateValues (); generateData (); // Disable View recalculation. For more information, see the togglecubic () method. Chart. setViewportCalculationEnabled (false); resetViewport (); return rootView;} // private void generateValues () {for (int I = 0; I <maxNumberOfLines; ++ I) {for (int j = 0; j <numberOfPoints; ++ j) {// randomNumbersTab [I] [j] = (float) Math. random () * 100f; randomNumbersTab [I] [j] = 5 ;}} private void resetViewport () {// Reset viewport height range to (0,100) final Viewport v = new Viewport (chart. getMaximumViewport (); v. bottom = 0; v. top = 100; v. left = 0; v. right = numberOfPoints-1; chart. setMaximumViewport (v); chart. setCurrentViewport (v);} // generate private void generateData () {List Lines = new ArrayList (); For (int I = 0; I <numberOfLines; ++ I) {List Values = new ArrayList (); For (int j = 0; j <numberOfPoints; ++ j) {values. add (new PointValue (j, randomNumbersTab [I] [j]);} Line line = new Line (values); line. setColor (ChartUtils. COLORS [I]); line. setShape (shape); line. setCubic (isCubic); line. setFilled (isFilled); line. setHasLabels (hasLabels); line. setHasLabelsOnlyForSelected (hasLabelForSelected); line. setHasLines (hasLines); line. setHasPoints (hasPoints); if (pointsHaveDifferentColor) {line. setPointColor (ChartUtils. COLORS [(I + 1) % ChartUtils. COLORS. length]);} lines. add (line);} data = new LineChartData (lines); if (hasAxes) {Axis axisX = new Axis (); Axis axisY = new Axis (). setHasLines (true); if (hasAxesNames) {axisX. setName ("Axis X"); axisY. setName ("Axis Y");} data. setAxisXBottom (axisX); data. setAxisYLeft (axisY);} else {data. setAxisXBottom (null); data. setAxisYLeft (null);} data. setBaseValue (Float. NEGATIVE_INFINITY); chart. setLineChartData (data);} private class ValueTouchListener implements LineChartOnValueSelectListener {@ Override public void onValueSelected (int lineIndex, int pointIndex, PointValue value) {Toast. makeText (getActivity (), "Selected:" + value, Toast. LENGTH_SHORT ). show () ;}@ Override public void onValueDeselected () {// TODO Auto-generated method stub }}}3.xml activity_main.xml Fragment_main.xml Activity_line_chart.xml Fragment_line_chart.xml