How to add tap listener on data point?

Question

I want to a add tap listener on a data point in the graph view in Android Studio.

There is a problem in my java code that says: can't resolve method get Activity() in last line of codes.

Help me resolve my problem.

Here is my code:

package com.example.graph;

import android.content.Context;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import android.app.Activity;

import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.DataPointInterface;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.series.OnDataPointTapListener;
import com.jjoe64.graphview.series.PointsGraphSeries;
import com.jjoe64.graphview.series.Series;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GraphView graph = (GraphView) findViewById(R.id.graph);
        LineGraphSeries<DataPoint> series = new LineGraphSeries<>(new DataPoint[] {
            new DataPoint(0, -2),
            new DataPoint(1, 5),
            new DataPoint(2, 3),
            new DataPoint(3, 2),
            new DataPoint(4, 6)
        });
        graph.addSeries(series);
        graph.setBackgroundColor(getResources().getColor(R.color.background_color));
        series.setThickness(5);
        graph.getViewport().setScalable(true);
        graph.getViewport().setScrollable(true);

        PointsGraphSeries<DataPoint> series2 = new PointsGraphSeries<>(new DataPoint[] {
            new DataPoint(0, -2),
            new DataPoint(1, 5),
            new DataPoint(2, 3),
            new DataPoint(3, 2),
            new DataPoint(4, 6)
        });
        graph.addSeries(series2);
        series2.setColor(Color.RED);
        series2.setSize(10);
        series2.setOnDataPointTapListener(new OnDataPointTapListener() {
            @Override
            public void onTap(Series series2, DataPointInterface dataPoint) {
                Toast.makeText(getActivity(), "Series1: On Data Point clicked: "+dataPoint, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

use getApplicationContext() instead of getActivity – siddhesh Jan 02 '17 at 09:59 — siddhesh, Jan 02 '17 at 09:59

score 4 · Accepted Answer · answered Jan 02 '17 at 09:59

4

Your OnDataPointTapListener is an anonymous class, inside this class the method getActivity does not exist, but it does exits within your Activity. You should use the this from your MainActivity not this from your OnDataPointTapListener:

Toast.makeText(MainActivity.this.getActivity(), "Series1: On Data Point clicked: "+dataPoint, Toast.LENGTH_SHORT).show();

answered Jan 02 '17 at 09:59

Rolf ツ

8,611
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MainActivity.this is also worked for me, I couldn't understand MainActivity.this.get Activity() part btw. – Bay Sep 26 '19 at 13:46

garima · Answer 2 · 2017-01-19T09:45:47.817

2

Instead of getActivity put MainActivity.this

Toast.makeText(MainActivity.this, "Series1: On Data Point clicked: "+dataPoint, Toast.LENGTH_SHORT).show();

edited Jan 19 '17 at 09:45

answered Jan 18 '17 at 22:12

garima

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77

1

May I request you to please add some more context around your answer. Code-only answers are difficult to understand. It will help the asker and future readers both if you can add more information in your post. – RBT Jan 19 '17 at 00:06

How to add tap listener on data point?

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