DynamicalAddingActivity.java

package com.xxmassdeveloper.mpchartexample;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import androidx.core.content.ContextCompat;
import android.view.Menu;
import android.view.MenuItem;
import android.view.WindowManager;
import android.widget.Toast;

import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.components.YAxis.AxisDependency;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.LineData;
import com.github.mikephil.charting.data.LineDataSet;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.interfaces.datasets.ILineDataSet;
import com.github.mikephil.charting.listener.OnChartValueSelectedListener;
import com.github.mikephil.charting.utils.ColorTemplate;
import com.xxmassdeveloper.mpchartexample.notimportant.DemoBase;

import java.util.ArrayList;

public class DynamicalAddingActivity extends DemoBase implements OnChartValueSelectedListener {

    private LineChart chart;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_linechart_noseekbar);

        setTitle("DynamicalAddingActivity");

        chart = findViewById(R.id.chart1);
        chart.setOnChartValueSelectedListener(this);
        chart.setDrawGridBackground(false);
        chart.getDescription().setEnabled(false);
        chart.setNoDataText("No chart data available. Use the menu to add entries and data sets!");

//        chart.getXAxis().setDrawLabels(false);
//        chart.getXAxis().setDrawGridLines(false);

        chart.invalidate();
    }

    private final int[] colors = ColorTemplate.VORDIPLOM_COLORS;

    private void addEntry() {

        LineData data = chart.getData();

        if (data == null) {
            data = new LineData();
            chart.setData(data);
        }

        ILineDataSet set = data.getDataSetByIndex(0);
        // set.addEntry(...); // can be called as well

        if (set == null) {
            set = createSet();
            data.addDataSet(set);
        }

        // choose a random dataSet
        int randomDataSetIndex = (int) (Math.random() * data.getDataSetCount());
        ILineDataSet randomSet = data.getDataSetByIndex(randomDataSetIndex);
        float value = (float) (Math.random() * 50) + 50f * (randomDataSetIndex + 1);

        data.addEntry(new Entry(randomSet.getEntryCount(), value), randomDataSetIndex);
        data.notifyDataChanged();

        // let the chart know it's data has changed
        chart.notifyDataSetChanged();

        chart.setVisibleXRangeMaximum(6);
        //chart.setVisibleYRangeMaximum(15, AxisDependency.LEFT);
//
//            // this automatically refreshes the chart (calls invalidate())
        chart.moveViewTo(data.getEntryCount() - 7, 50f, AxisDependency.LEFT);

    }

    private void removeLastEntry() {

        LineData data = chart.getData();

        if (data != null) {

            ILineDataSet set = data.getDataSetByIndex(0);

            if (set != null) {

                Entry e = set.getEntryForXValue(set.getEntryCount() - 1, Float.NaN);

                data.removeEntry(e, 0);
                // or remove by index
                // mData.removeEntryByXValue(xIndex, dataSetIndex);
                data.notifyDataChanged();
                chart.notifyDataSetChanged();
                chart.invalidate();
            }
        }
    }

    private void addDataSet() {

        LineData data = chart.getData();

        if (data == null) {
            chart.setData(new LineData());
        } else {
            int count = (data.getDataSetCount() + 1);
            int amount = data.getDataSetByIndex(0).getEntryCount();

            ArrayList<Entry> values = new ArrayList<>();

            for (int i = 0; i < amount; i++) {
                values.add(new Entry(i, (float) (Math.random() * 50f) + 50f * count));
            }

            LineDataSet set = new LineDataSet(values, "DataSet " + count);
            set.setLineWidth(2.5f);
            set.setCircleRadius(4.5f);

            int color = colors[count % colors.length];

            set.setColor(color);
            set.setCircleColor(color);
            set.setHighLightColor(color);
            set.setValueTextSize(10f);
            set.setValueTextColor(color);

            data.addDataSet(set);
            data.notifyDataChanged();
            chart.notifyDataSetChanged();
            chart.invalidate();
        }
    }

    private void removeDataSet() {

        LineData data = chart.getData();

        if (data != null) {

            data.removeDataSet(data.getDataSetByIndex(data.getDataSetCount() - 1));

            chart.notifyDataSetChanged();
            chart.invalidate();
        }
    }

    private LineDataSet createSet() {

        LineDataSet set = new LineDataSet(null, "DataSet 1");
        set.setLineWidth(2.5f);
        set.setCircleRadius(4.5f);
        set.setColor(Color.rgb(240, 99, 99));
        set.setCircleColor(Color.rgb(240, 99, 99));
        set.setHighLightColor(Color.rgb(190, 190, 190));
        set.setAxisDependency(AxisDependency.LEFT);
        set.setValueTextSize(10f);

        return set;
    }

    @Override
    public void onValueSelected(Entry e, Highlight h) {
        Toast.makeText(this, e.toString(), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNothingSelected() {}

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.dynamical, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
            case R.id.viewGithub: {
                Intent i = new Intent(Intent.ACTION_VIEW);
                i.setData(Uri.parse("https://github.com/PhilJay/MPAndroidChart/blob/master/MPChartExample/src/com/xxmassdeveloper/mpchartexample/DynamicalAddingActivity.java"));
                startActivity(i);
                break;
            }
            case R.id.actionAddEntry: {
                addEntry();
                Toast.makeText(this, "Entry added!", Toast.LENGTH_SHORT).show();
                break;
            }
            case R.id.actionRemoveEntry: {
                removeLastEntry();
                Toast.makeText(this, "Entry removed!", Toast.LENGTH_SHORT).show();
                break;
            }
            case R.id.actionAddDataSet: {
                addDataSet();
                Toast.makeText(this, "DataSet added!", Toast.LENGTH_SHORT).show();
                break;
            }
            case R.id.actionRemoveDataSet: {
                removeDataSet();
                Toast.makeText(this, "DataSet removed!", Toast.LENGTH_SHORT).show();
                break;
            }
            case R.id.actionClear: {
                chart.clear();
                Toast.makeText(this, "Chart cleared!", Toast.LENGTH_SHORT).show();
                break;
            }
            case R.id.actionSave: {
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                    saveToGallery();
                } else {
                    requestStoragePermission(chart);
                }
                break;
            }
        }

        return true;
    }

    @Override
    protected void saveToGallery() {
        saveToGallery(chart, "DynamicalAddingActivity");
    }
}