In SciChart Android, it is possible to customize the look and feel of Tooltips for our Android Charts. This examples demostrates how to do this using RolloverModifer.

What can be customized? The actual tooltips style (background, size, opacity) as well as text style (font family, font size, weight, text color). The marker which intersects the series, and also text formatting of the rollover tooltip itself.

// example_single_chart_fragment.xml

<?xml version="1.0" encoding="utf-8"?><!--*************************************************************************-->
<!-- SCICHART® Copyright SciChart Ltd. 2011-2016. All rights reserved. -->
<!--   -->
<!-- Web: http://www.scichart.com -->
<!-- Support: support@scichart.com -->
<!-- Sales:   sales@scichart.com -->
<!--  -->
<!-- example_single_chart_fragment.xml is part of the SCICHART® Examples. Permission is hereby granted -->
<!-- to modify, create derivative works, distribute and publish any part of this source -->
<!-- code whether for commercial, private or personal use. -->
<!--  -->
<!-- The SCICHART® examples are distributed in the hope that they will be useful, but -->
<!-- without any warranty. It is provided "AS IS" without warranty of any kind, either -->
<!-- expressed or implied. -->
<!--*************************************************************************-->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.scichart.charting.visuals.SciChartSurface
        android:id="@+id/chart"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

// CustomizationRolloverModifierTooltipsFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2017. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// CustomizationRolloverModifierTooltipsFragment.java is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

package com.scichart.examples.fragments;

import android.content.Context;
import android.text.SpannableStringBuilder;
import android.view.animation.DecelerateInterpolator;

import com.scichart.charting.model.dataSeries.XyDataSeries;
import com.scichart.charting.modifiers.RolloverModifier;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.axes.AxisInfo;
import com.scichart.charting.visuals.axes.AxisTooltip;
import com.scichart.charting.visuals.axes.DefaultAxisInfoProvider;
import com.scichart.charting.visuals.axes.IAxis;
import com.scichart.charting.visuals.axes.IAxisTooltip;
import com.scichart.charting.visuals.renderableSeries.FastLineRenderableSeries;
import com.scichart.charting.visuals.renderableSeries.hitTest.DefaultXySeriesInfoProvider;
import com.scichart.charting.visuals.renderableSeries.hitTest.XySeriesInfo;
import com.scichart.charting.visuals.renderableSeries.tooltips.ISeriesTooltip;
import com.scichart.charting.visuals.renderableSeries.tooltips.XySeriesTooltip;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.core.utility.StringUtil;
import com.scichart.drawing.utility.ColorUtil;
import com.scichart.examples.R;
import com.scichart.examples.data.DoubleSeries;
import com.scichart.examples.data.RandomWalkGenerator;
import com.scichart.examples.fragments.base.ExampleBaseFragment;

import java.util.Collections;

import butterknife.BindView;

public class CustomizationRolloverModifierTooltipsFragment extends ExampleBaseFragment {
    private static final int POINTS_COUNT = 200;
    private static final String MODIFIER_NAME = "RolloverModifier";

    @BindView(R.id.chart)
    SciChartSurface surface;

    @Override
    protected int getLayoutId() {
        return R.layout.example_single_chart_fragment;
    }

    @Override
    protected void initExample() {
        final IAxis xAxis = sciChartBuilder.newNumericAxis().withAxisInfoProvider(new CustomAxisInfoProvider()).build();
        final IAxis yAxis = sciChartBuilder.newNumericAxis().build();

        final RandomWalkGenerator randomWalkGenerator = new RandomWalkGenerator();

        final DoubleSeries data1 = randomWalkGenerator.getRandomWalkSeries(POINTS_COUNT);
        randomWalkGenerator.reset();
        final DoubleSeries data2 = randomWalkGenerator.getRandomWalkSeries(POINTS_COUNT);

        final XyDataSeries<Double, Double> ds1 = sciChartBuilder.newXyDataSeries(Double.class, Double.class).withSeriesName("Series #1").build();
        final XyDataSeries<Double, Double> ds2 = sciChartBuilder.newXyDataSeries(Double.class, Double.class).withSeriesName("Series #2").build();

        ds1.append(data1.xValues, data1.yValues);
        ds2.append(data2.xValues, data2.yValues);

        final FastLineRenderableSeries lineRs1 = sciChartBuilder.newLineSeries().withDataSeries(ds1).withSeriesInfoProvider(new FirstCustomSeriesInfoProvider()).withStrokeStyle(0xff6495ed, 2, true).build();
        final FastLineRenderableSeries lineRs2 = sciChartBuilder.newLineSeries().withDataSeries(ds2).withSeriesInfoProvider(new SecondCustomSeriesInfoProvider()).withStrokeStyle(0xffe2460c, 2, true).build();

        UpdateSuspender.using(surface, new Runnable() {
            @Override
            public void run() {
                Collections.addAll(surface.getXAxes(), xAxis);
                Collections.addAll(surface.getYAxes(), yAxis);
                Collections.addAll(surface.getRenderableSeries(), lineRs1, lineRs2);
                Collections.addAll(surface.getChartModifiers(), sciChartBuilder.newModifierGroup().withRolloverModifier().build().build());

                sciChartBuilder.newAnimator(lineRs1).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
                sciChartBuilder.newAnimator(lineRs2).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
            }
        });
    }

    private static class FirstCustomSeriesInfoProvider extends DefaultXySeriesInfoProvider {
        @Override
        protected ISeriesTooltip getSeriesTooltipInternal(Context context, XySeriesInfo<?> seriesInfo, Class<?> modifierType) {
            if (modifierType == RolloverModifier.class) {
                return new FirstCustomXySeriesTooltip(context, seriesInfo);
            } else {
                return super.getSeriesTooltipInternal(context, seriesInfo, modifierType);
            }
        }

        private static class FirstCustomXySeriesTooltip extends XySeriesTooltip {
            public FirstCustomXySeriesTooltip(Context context, XySeriesInfo seriesInfo) {
                super(context, seriesInfo);
            }

            @Override
            protected void internalUpdate(XySeriesInfo seriesInfo) {
                final SpannableStringBuilder sb = new SpannableStringBuilder();

                sb.append("X: ").append(seriesInfo.getFormattedXValue()).append(StringUtil.NEW_LINE);
                sb.append("Y: ").append(seriesInfo.getFormattedYValue()).append(StringUtil.NEW_LINE);

                if (seriesInfo.seriesName != null) {
                    sb.append(seriesInfo.seriesName).append(StringUtil.NEW_LINE);
                }
                sb.append(MODIFIER_NAME);
                setText(sb);

                setTooltipBackgroundColor(0xff6495ed);
                setTooltipStroke(0xff4d81dd);
                setTooltipTextColor(ColorUtil.White);
            }
        }
    }

    private static class SecondCustomSeriesInfoProvider extends DefaultXySeriesInfoProvider {
        @Override
        protected ISeriesTooltip getSeriesTooltipInternal(Context context, XySeriesInfo<?> seriesInfo, Class<?> modifierType) {
            if (modifierType == RolloverModifier.class) {
                return new SecondCustomXySeriesTooltip(context, seriesInfo);
            } else {
                return super.getSeriesTooltipInternal(context, seriesInfo, modifierType);
            }
        }

        private static class SecondCustomXySeriesTooltip extends XySeriesTooltip {
            public SecondCustomXySeriesTooltip(Context context, XySeriesInfo seriesInfo) {
                super(context, seriesInfo);
            }

            @Override
            protected void internalUpdate(XySeriesInfo seriesInfo) {
                final SpannableStringBuilder sb = new SpannableStringBuilder();
                sb.append(MODIFIER_NAME).append(StringUtil.NEW_LINE);

                if (seriesInfo.seriesName != null) {
                    sb.append(seriesInfo.seriesName).append(StringUtil.NEW_LINE);
                }
                sb.append("X: ").append(seriesInfo.getFormattedXValue());
                sb.append(" Y: ").append(seriesInfo.getFormattedYValue());

                setText(sb);

                setTooltipBackgroundColor(0xffe2460c);
                setTooltipStroke(0xffff4500);
                setTooltipTextColor(ColorUtil.White);
            }
        }
    }

    private static class CustomAxisInfoProvider extends DefaultAxisInfoProvider {
        @Override
        protected IAxisTooltip getAxisTooltipInternal(Context context, AxisInfo axisInfo, Class<?> modifierType) {
            if (modifierType == RolloverModifier.class) {
                return new CustomAxisTooltip(context, axisInfo);
            } else {
                return super.getAxisTooltipInternal(context, axisInfo, modifierType);
            }
        }

        private static class CustomAxisTooltip extends AxisTooltip {
            public CustomAxisTooltip(Context context, AxisInfo axisInfo) {
                super(context, axisInfo);
                setTooltipBackground(R.drawable.example_custom_axis_tooltip_background);
            }

            @Override
            protected boolean updateInternal(AxisInfo axisInfo) {
                final SpannableStringBuilder sb = new SpannableStringBuilder();
                sb.append("Axis ID: ").append(axisInfo.axisId).append(StringUtil.NEW_LINE);
                sb.append("Value: ").append(axisInfo.axisFormattedDataValue);

                setText(sb);

                return true;
            }
        }
    }
}

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