private void init(){
    bGSeries = new PointsGraphSeries<>();

    btnAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if(!bg.getText().toString().equals("")){
                double mbg = Double.parseDouble(bg.getText().toString());
                if(mbg > 300){
                    toastMessage("You should be going to the ER not using this app.");
                }
                bgValueArray.add(new bgValue(mbg));
                init();
            }else {
                toastMessage("You must enter a BG.");
            }
        }
    });

    if(bgValueArray.size() != 0){
        createGraph();
    }else{
        Log.d(TAG, "onCreate: No data to plot.");
    }
}

private void createGraph()

{

    //Adds data to the graph
    for(int i = 0;i <bgValueArray.size(); i++){
        try{
            double x = bgValueArray.get(i).getBg();
            bGSeries.appendData(new DataPoint(x,x),true, 50);
        }catch (IllegalArgumentException e){
            Log.e(TAG, "createScatterPlot: IllegalArgumentException: " + e.getMessage() );
        }
    }

    //properties of the line graph
    bGSeries.setShape(PointsGraphSeries.Shape.RECTANGLE);
    bGSeries.setColor(Color.RED);
    bGSeries.setSize(15f);

    //X Graph Bounds
    mLineGraph.getViewport().setYAxisBoundsManual(true);
    mLineGraph.getViewport().setMaxY(300);
    mLineGraph.getViewport().setMinY(0);

    //Y Graph Bounds
    mLineGraph.getViewport().setXAxisBoundsManual(true);
    mLineGraph.getViewport().setMaxX(300);
    mLineGraph.getViewport().setMinX(0);

    mLineGraph.addSeries(bGSeries);
}