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

package com.xxmassdeveloper.mpchartexample;

import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.WindowManager;

import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.components.Legend;
import com.github.mikephil.charting.components.Legend.LegendForm;
import com.github.mikephil.charting.components.XAxis;
import com.github.mikephil.charting.components.YAxis;
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.listener.OnChartValueSelectedListener;
import com.github.mikephil.charting.utils.ColorTemplate;
import com.xxmassdeveloper.mpchartexample.notimportant.DemoBase;

public class RealtimeLineChartActivity 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_realtime_linechart);

        mChart = (LineChart) findViewById(R.id.chart1);
        mChart.setOnChartValueSelectedListener(this);

        // no description text
        mChart.setDescription("");
        mChart.setNoDataTextDescription("You need to provide data for the chart.");

        // enable value highlighting
        mChart.setHighlightEnabled(true);

        // enable touch gestures
        mChart.setTouchEnabled(true);

        // enable scaling and dragging
        mChart.setDragEnabled(true);
        mChart.setScaleEnabled(true);
        mChart.setDrawGridBackground(false);

        // if disabled, scaling can be done on x- and y-axis separately
        mChart.setPinchZoom(true);

        // set an alternative background color
        mChart.setBackgroundColor(Color.LTGRAY);

        LineData data = new LineData();
        data.setValueTextColor(Color.WHITE);
        
        // add empty data
        mChart.setData(data);

        Typeface tf = Typeface.createFromAsset(getAssets(), "OpenSans-Regular.ttf");

        // get the legend (only possible after setting data)
        Legend l = mChart.getLegend();

        // modify the legend ...
        // l.setPosition(LegendPosition.LEFT_OF_CHART);
        l.setForm(LegendForm.LINE);
        l.setTypeface(tf);
        l.setTextColor(Color.WHITE);

        XAxis xl = mChart.getXAxis();
        xl.setTypeface(tf);
        xl.setTextColor(Color.WHITE);
        xl.setDrawGridLines(false);
        xl.setAvoidFirstLastClipping(true);

        YAxis leftAxis = mChart.getAxisLeft();
        leftAxis.setTypeface(tf);
        leftAxis.setTextColor(Color.WHITE);
        leftAxis.setAxisMaxValue(120f);
        leftAxis.setDrawGridLines(true);
        
        YAxis rightAxis = mChart.getAxisRight();
        rightAxis.setEnabled(false);
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
            case R.id.actionAdd: {
                addEntry();
                break;
            }
        }
        return true;
    }

    private int year = 15;
    
    private void addEntry() {

        LineData data = mChart.getData();

        if (data != null) {

            LineDataSet 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(mMonths[data.getXValCount() % 12] + " " + (year + data.getXValCount() / 12));
            data.addEntry(new Entry((float) (Math.random() * 40) + 40f, set.getEntryCount()), 0);

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

            // limit the number of visible entries
             mChart.setVisibleXRange(6);
            // mChart.setVisibleYRange(30, AxisDependency.LEFT);
            
             // move to the latest entry
             mChart.moveViewToX(data.getXValCount()-7);
             
             // this automatically refreshes the chart (calls invalidate())
//             mChart.moveViewTo(data.getXValCount()-7, 55f, AxisDependency.LEFT);

            // redraw the chart
//            mChart.invalidate();
        }
    }

    private LineDataSet createSet() {

        LineDataSet set = new LineDataSet(null, "Dynamic Data");
        set.setAxisDependency(AxisDependency.LEFT);
        set.setColor(ColorTemplate.getHoloBlue());
        set.setCircleColor(ColorTemplate.getHoloBlue());
        set.setLineWidth(2f);
        set.setCircleSize(4f);
        set.setFillAlpha(65);
        set.setFillColor(ColorTemplate.getHoloBlue());
        set.setHighLightColor(Color.rgb(244, 117, 117));
        set.setValueTextColor(Color.WHITE);
        set.setValueTextSize(10f);
        return set;
    }

    @Override
    public void onValueSelected(Entry e, int dataSetIndex) {
        Log.i("Entry selected", e.toString());
    }

    @Override
    public void onNothingSelected() {
        Log.i("Nothing selected", "Nothing selected.");
    }
}