Android Open Source - customhellochartdemo Pie Chart Activity

From Project

Back to project page customhellochartdemo.
License

The source code is released under:
Apache License
If you think the Android project customhellochartdemo listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package lecho.lib.hellocharts.samples;
/*from  w w  w .  j a va  2 s .  c  om*/
import java.util.ArrayList;
import java.util.List;

import lecho.lib.hellocharts.model.ArcValue;
import lecho.lib.hellocharts.model.PieChartData;
import lecho.lib.hellocharts.util.Utils;
import lecho.lib.hellocharts.view.Chart;
import lecho.lib.hellocharts.view.PieChartView;
import lecho.lib.hellocharts.view.PieChartView.PieChartOnValueTouchListener;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

public class PieChartActivity extends ActionBarActivity {

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

  /**
   * A fragment containing a pie chart.
   */
  public static class PlaceholderFragment extends Fragment {

    private PieChartView chart;
    private PieChartData data;

    private boolean hasLabels = false;
    private boolean hasLabelsOutside = false;
    private boolean hasCenterCircle = false;
    private boolean hasCenterText1 = false;
    private boolean hasCenterText2 = false;
    private boolean isExploaded = false;
    private boolean hasArcSeparated = false;
    private boolean hasLabelForSelected = false;

    public PlaceholderFragment() {
    }

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

      chart = (PieChartView) rootView.findViewById(R.id.chart);
      chart.setOnValueTouchListener(new ValueTouchListener());

      generateData();

      return rootView;
    }

    // MENU
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
      inflater.inflate(R.menu.pie_chart, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
      int id = item.getItemId();
      if (id == R.id.action_reset) {
        reset();
        generateData();
        return true;
      }
      if (id == R.id.action_explode) {
        explodeChart();
        return true;
      }
      if (id == R.id.action_single_arc_separation) {
        separateSingleArc();
        return true;
      }
      if (id == R.id.action_center_circle) {
        hasCenterCircle = !hasCenterCircle;
        if (!hasCenterCircle) {
          hasCenterText1 = false;
          hasCenterText2 = false;
        }

        generateData();
        return true;
      }
      if (id == R.id.action_center_text1) {
        hasCenterText1 = !hasCenterText1;

        if (hasCenterText1) {
          hasCenterCircle = true;
        }

        hasCenterText2 = false;

        generateData();
        return true;
      }
      if (id == R.id.action_center_text2) {
        hasCenterText2 = !hasCenterText2;

        if (hasCenterText2) {
          hasCenterText1 = true;// text 2 need text 1 to by also drawn.
          hasCenterCircle = true;
        }

        generateData();
        return true;
      }
      if (id == R.id.action_toggle_labels) {
        toggleLabels();
        return true;
      }
      if (id == R.id.action_toggle_labels_outside) {
        toggleLabelsOutside();
        return true;
      }
      if (id == R.id.action_animate) {
        prepareDataAnimation();
        chart.startDataAnimation();
        return true;
      }
      if (id == R.id.action_toggle_selection_mode) {
        toggleLabelForSelected();
        Toast.makeText(getActivity(),
            "Selection mode set to " + chart.isValueSelectionEnabled() + " select any point.",
            Toast.LENGTH_SHORT).show();
        return true;
      }
      return super.onOptionsItemSelected(item);
    }

    private void reset() {
      chart.setCircleFillRatio(1.0f);
      hasLabels = false;
      hasLabelsOutside = false;
      hasCenterCircle = false;
      hasCenterText1 = false;
      hasCenterText2 = false;
      isExploaded = false;
      hasArcSeparated = false;
      hasLabelForSelected = false;
    }

    private void generateData() {
      int numValues = 6;

      List<ArcValue> values = new ArrayList<ArcValue>();
      for (int i = 0; i < numValues; ++i) {
        ArcValue arcValue = new ArcValue((float) Math.random() * 30 + 15, Utils.pickColor());

        if (isExploaded) {
          arcValue.setArcSpacing(24);
        }

        if (hasArcSeparated && i == 0) {
          arcValue.setArcSpacing(32);
        }

        values.add(arcValue);
      }

      data = new PieChartData(values);
      data.setHasLabels(hasLabels);
      data.setHasLabelsOnlyForSelected(hasLabelForSelected);
      data.setHasLabelsOutside(hasLabelsOutside);
      data.setHasCenterCircle(hasCenterCircle);

      if (hasCenterText1) {
        data.setCenterText1("Hello!");

        // Get roboto-italic font.
        Typeface tf = Typeface.createFromAsset(getActivity().getAssets(), "Roboto-Italic.ttf");
        data.setCenterText1Typeface(tf);

        // Get font size from dimens.xml and convert it to sp(library uses sp values).
        data.setCenterText1FontSize(Utils.px2sp(getResources().getDisplayMetrics().scaledDensity,
            (int) getResources().getDimension(R.dimen.pie_chart_text1_size)));
      }

      if (hasCenterText2) {
        data.setCenterText2("Charts (Roboto Italic)");

        Typeface tf = Typeface.createFromAsset(getActivity().getAssets(), "Roboto-Italic.ttf");

        data.setCenterText2Typeface(tf);
        data.setCenterText2FontSize(Utils.px2sp(getResources().getDisplayMetrics().scaledDensity,
            (int) getResources().getDimension(R.dimen.pie_chart_text2_size)));
      }

      chart.setPieChartData(data);
    }

    private void explodeChart() {
      isExploaded = !isExploaded;
      generateData();

    }

    private void separateSingleArc() {
      hasArcSeparated = !hasArcSeparated;
      if (hasArcSeparated) {
        isExploaded = false;
      }
      generateData();
    }

    private void toggleLabelsOutside() {
      // has labels have to be true:P
      hasLabelsOutside = !hasLabelsOutside;
      if (hasLabelsOutside) {
        hasLabels = true;
        hasLabelForSelected = false;
        chart.setValueSelectionEnabled(hasLabelForSelected);
      }

      if (hasLabelsOutside) {
        chart.setCircleFillRatio(0.7f);
      } else {
        chart.setCircleFillRatio(1.0f);
      }

      generateData();

    }

    private void toggleLabels() {
      hasLabels = !hasLabels;

      if (hasLabels) {
        hasLabelForSelected = false;
        chart.setValueSelectionEnabled(hasLabelForSelected);

        if (hasLabelsOutside) {
          chart.setCircleFillRatio(0.7f);
        } else {
          chart.setCircleFillRatio(1.0f);
        }
      }

      generateData();
    }

    private void toggleLabelForSelected() {
      hasLabelForSelected = !hasLabelForSelected;

      chart.setValueSelectionEnabled(hasLabelForSelected);

      if (hasLabelForSelected) {
        hasLabels = false;
        hasLabelsOutside = false;

        if (hasLabelsOutside) {
          chart.setCircleFillRatio(0.7f);
        } else {
          chart.setCircleFillRatio(1.0f);
        }
      }

      generateData();
    }

    /**
     * To animate values you have to change targets values and then call {@link Chart#startDataAnimation()}
     * method(don't confuse with View.animate()).
     */
    private void prepareDataAnimation() {
      for (ArcValue value : data.getValues()) {
        value.setTarget((float) Math.random() * 30 + 15);
      }
    }

    private class ValueTouchListener implements PieChartOnValueTouchListener {

      @Override
      public void onValueTouched(int selectedArc, ArcValue value) {
        Toast.makeText(getActivity(), "Selected: " + value, Toast.LENGTH_SHORT).show();

      }

      @Override
      public void onNothingTouched() {
        // TODO Auto-generated method stub

      }

    }
  }
}
Java Source Code List
