Question

——-UPDATED————————————-

In this class i do the calculations:

...
ArrayList<Double> final_cores =new ArrayList<Double>();
...
public void cores_func(){
             double initcores=Double.parseDouble(num_cores.getText().toString().trim());
             double half_time=Double.parseDouble(halftimecores.getText().toString().trim());
             double ttime=Double.parseDouble(timecores.getText().toString().trim());
             double l=Math.log(2)/half_time;
             double fcores=initcores*Math.exp(-l*ttime);
             for (int i=0;i<=ttime;i++){
                  final_cores.add(initcores*Math.exp(-l*ttime));


             }

             //convert ArrayList to double[]

             double[] mydata = new double[final_cores.size()];
             for(int i = 0; i < final_cores.size(); i++) {
                 mydata[i] = final_cores.get(i);
             }
             Intent i=new Intent(this,core_calcs.class);
             i.putExtra("value",fcores);
             i.putExtra("value2",initcores);
             i.putExtra("value3",ttime);
             i.putExtra("final_cores",mydata);
                     startActivity(i);  
         }
          ...

and in the linegraph class :

...
private double [] final_cores =new double [100];
public double []  getFinal_cores(){ return this.mydata;} 
public void setFinal_cores( double [] final_cores){ this.mydata=mydata;} 
public void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);

        Bundle extras=getIntent().getExtras();
...
double [] mydata = extras.getDoubleArray("final_cores");
setFinal_cores(mydata);

public Intent getIntent(Context context){
...
 double []mydata=getFinal_cores();

ArrayList<Double> x =new ArrayList<Double>();
        ArrayList<Double> y =new ArrayList<Double>();
       // ArrayList<Double> data =new ArrayList<Double>();

         //fill x,y values
         for (int i=0;i<=10;i++){ 
             x.add(ttime / 10.0 * i);
         } 

        for (int i=0;i<=10;i++){ 
         y.add(initcores + ((mydata[i]) / 10.0 * i)); 

     } 


        TimeSeries series = new TimeSeries("Decay");
        for (int i=0;i<x.size();i++){
            series.add(x.get(i),y.get(i));          
        }

Answer 1

1) Unfortunately for you it does not seem that there is an easy way to pass double ArrayLists. There are two ways you can approach this:

a) You need to create a class that wraps around a double (note: the primitive not the class) and extends Parcelable (guide is here: http://developer.android.com/reference/android/os/Parcelable.html). If this class is called NewDouble, you can use the code below:

ArrayList<NewDouble> final_cores = (ArrayList<NewDouble>)extras.getParcelableArrayList("final_cores");

b) If you convert the ArrayList to a double[] before putting it in the bundle, you can use getDoubleArray() to a double array.

Quick code to convert an ArrayList to a double array:

    double[] doubleArray = new double[final_cores.size()];
    for(int i = 0; i < final_cores.size(); i++) {
        doubleArray[i] = final_cores.get(i);
    }