MPChartExample/src/com/xxmassdeveloper/mpchartexample/DynamicalAddingActivity.java

package com.xxmassdeveloper.mpchartexample;

import android.graphics.Color;
import android.os.Bundle;
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.interfaces.datasets.ILineDataSet;
import com.github.mikephil.charting.listener.OnChartValueSelectedListener;
import com.github.mikephil.charting.utils.ColorTemplate;
import com.github.mikephil.charting.highlight.Highlight;
import com.xxmassdeveloper.mpchartexample.notimportant.DemoBase;

import java.util.ArrayList;

public class DynamicalAddingActivity extends DemoBase implements OnChartValueSelectedListener {

    private LineChart mChart;

    @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);

        mChart = (LineChart) findViewById(R.id.chart1);
        mChart.setOnChartValueSelectedListener(this);
        mChart.setDrawGridBackground(false);
        mChart.setDescription("");
        
        // add an empty data object
        mChart.setData(new LineData());
//        mChart.getXAxis().setDrawLabels(false);
//        mChart.getXAxis().setDrawGridLines(false);

        mChart.invalidate();
    }

    int[] mColors = ColorTemplate.VORDIPLOM_COLORS;

    private void addEntry() {

        LineData data = mChart.getData();
        
        if(data != null) {

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

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

            // add a new x-value first
            data.addXValue(set.getEntryCount() + "");
            
            // choose a random dataSet
            int randomDataSetIndex = (int) (Math.random() * data.getDataSetCount());
            
            data.addEntry(new Entry((float) (Math.random() * 10) + 50f, set.getEntryCount()), randomDataSetIndex);

            // let the chart know it's data has changed
            mChart.notifyDataSetChanged();
            
            mChart.setVisibleXRangeMaximum(6);
            mChart.setVisibleYRangeMaximum(15, AxisDependency.LEFT);
//            
//            // this automatically refreshes the chart (calls invalidate())
            mChart.moveViewTo(data.getXValCount()-7, 50f, AxisDependency.LEFT);
        }
    }

    private void removeLastEntry() {

        LineData data = mChart.getData();
        
        if(data != null) {
         
            ILineDataSet set = data.getDataSetByIndex(0);

            if (set != null) {

                Entry e = set.getEntryForXIndex(set.getEntryCount() - 1);

                data.removeEntry(e, 0);
                // or remove by index
                // mData.removeEntry(xIndex, dataSetIndex);

                mChart.notifyDataSetChanged();
                mChart.invalidate();
            }
        }
    }

    private void addDataSet() {

        LineData data = mChart.getData();
        
        if(data != null) {

            int count = (data.getDataSetCount() + 1);

            // create 10 y-vals
            ArrayList<Entry> yVals = new ArrayList<Entry>();
            
            if(data.getXValCount() == 0) {
                // add 10 x-entries
                for (int i = 0; i < 10; i++) {
                    data.addXValue("" + (i+1));
                }
            }

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

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

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

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

            data.addDataSet(set);
            mChart.notifyDataSetChanged();
            mChart.invalidate();   
        }
    }

    private void removeDataSet() {

        LineData data = mChart.getData();
        
        if(data != null) {

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

            mChart.notifyDataSetChanged();
            mChart.invalidate();   
        }
    }

    @Override
    public void onValueSelected(Entry e, int dataSetIndex, 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.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.actionAddEmptyLineData:
                mChart.setData(new LineData());
                mChart.invalidate();
                Toast.makeText(this, "Empty data added!", Toast.LENGTH_SHORT).show();
                break;
            case R.id.actionClear:
                mChart.clear();
                Toast.makeText(this, "Chart cleared!", Toast.LENGTH_SHORT).show();
                break;
        }

        return true;
    }

    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;
    }
}