Android Open Source - customhellochartdemo Good Bad Chart Activity

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License

The source code is released under:
Apache License
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Java Source Code

package lecho.lib.hellocharts.samples;
/*from  w  w w. j a v a2  s  .c om*/
import java.util.ArrayList;
import java.util.List;

import lecho.lib.hellocharts.model.Line;
import lecho.lib.hellocharts.model.LineChartData;
import lecho.lib.hellocharts.model.PointValue;
import lecho.lib.hellocharts.model.Viewport;
import lecho.lib.hellocharts.util.Utils;
import lecho.lib.hellocharts.view.LineChartView;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class GoodBadChartActivity extends ActionBarActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_good_bad);
    if (savedInstanceState == null) {
      getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
    }
  }

  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {

    private LineChartView chart;
    private LineChartData data;

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      View rootView = inflater.inflate(R.layout.fragment_good_bad, container, false);

      chart = (LineChartView) rootView.findViewById(R.id.chart);

      generateDefaultData();
      chart.setLineChartData(data);

      // Increase viewport height for better look
      Viewport v = chart.getMaximumViewport();
      float dy = v.height() * 0.2f;
      v.inset(0, -dy);
      chart.setMaximumViewport(v);
      chart.setCurrentViewport(v, false);

      return rootView;
    }

    private void generateDefaultData() {

      // Generate data, every line has 3 points to form filled triangle. Point radius is set to 1 to be almost
      // invisible but it has to be there because without points there is not labels. Area transparency is set to
      // 255(full opacity).

      // Important note. This example uses negative values, to properly fill area below 0 chart base value have to
      // be set to 0. That is default base value but if you want to be sure you can call data.setBaseValue(0)
      // method.

      Line line;
      List<PointValue> values;
      List<Line> lines = new ArrayList<Line>();

      // First good triangle
      values = new ArrayList<PointValue>();
      values.add(new PointValue(0, 0).setLabel("".toCharArray()));
      values.add(new PointValue(1, 1).setLabel("Very Good:)".toCharArray()));
      values.add(new PointValue(2, 0).setLabel("".toCharArray()));

      line = new Line(values);
      line.setColor(Utils.COLOR_GREEN);
      line.setAreaTransparency(255);
      line.setFilled(true);
      line.setPointRadius(1);
      line.setHasLabels(true);
      lines.add(line);

      // Second good triangle
      values = new ArrayList<PointValue>();
      values.add(new PointValue(3, 0).setLabel("".toCharArray()));
      values.add(new PointValue(4, 0.5f).setLabel("Good Enough".toCharArray()));
      values.add(new PointValue(5, 0).setLabel("".toCharArray()));

      line = new Line(values);
      line.setColor(Utils.COLOR_GREEN);
      line.setAreaTransparency(255);
      line.setFilled(true);
      line.setPointRadius(1);
      line.setHasLabels(true);
      lines.add(line);

      // Bad triangle
      values = new ArrayList<PointValue>();
      values.add(new PointValue(1, 0).setLabel("".toCharArray()));
      values.add(new PointValue(2, -1).setLabel("Very Bad".toCharArray()));
      values.add(new PointValue(3, 0).setLabel("".toCharArray()));

      line = new Line(values);
      line.setColor(Utils.COLOR_RED);
      line.setAreaTransparency(255);
      line.setFilled(true);
      line.setPointRadius(1);
      line.setHasLabels(true);
      lines.add(line);

      data = new LineChartData(lines);

      // *** Important, set base value to 0 to fill negative part of chart.
      // data.setBaseValue(0);

    }
  }
}
Java Source Code List
