Question

I have made a simple android app,i that some calculations are there from 1 activity’s EditText value some multiplication,sum and other mathematical procedures and showing results as double in another activities edittexs.so can anyone please tell me is it necessary to cast string value to “double” for making calculation and how can i do it?

Activity1.java

Intent ic = new Intent(Calculator_1Activity.this,Calculator2a.class);
        ic.putExtra("e1", et1.getText().toString());
        ic.putExtra("e2", et2.getText().toString());
        ic.putExtra("e3", et3.getText().toString());
        ic.putExtra("e4", et4.getText().toString());
        ic.putExtra("e5", et5.getText().toString());
        ic.putExtra("e6", et6.getText().toString());
        ic.putExtra("e7", et7.getText().toString());
        ic.putExtra("e8", et8.getText().toString());

        startActivity(ic);

and i fetch its values in activity2a,but can’t do calculations….pls help..:(

Activity2a.java

  Intent receiveIntent = this.getIntent();
        String etz1 = receiveIntent.getStringExtra("e1");
        String etz2 = receiveIntent.getStringExtra("e2");
        String etz3 = receiveIntent.getStringExtra("e3");
        String etz4 = receiveIntent.getStringExtra("e4");
        String etz5 = receiveIntent.getStringExtra("e5");
        String etz6 = receiveIntent.getStringExtra("e6");
        String etz7 = receiveIntent.getStringExtra("e7");
        String etz8 = receiveIntent.getStringExtra("e8");

        et1.setText(etz1);
        et2.setText(etz2);
        et3.setText(etz3);
        et4.setText(etz4);
        et5.setText(etz5);
        et6.setText(etz6);
        et7.setText(etz7);
        et8.setText(etz8);

please help me

Answer 1

do something like below

        Intent receiveIntent = this.getIntent();
        String etz1 = receiveIntent.getStringExtra("e1");

        double erz1Double = Double.parseDouble(etz1); //converting into double
      // follow same for all the string values, dont forget to add try Catch for number formatException, and null check for string values

Edit:- for casting double to string, there are many ways can do something like below

 String erz1String = erz1Double + "";

       or


 String erz1String = String.valueOf(erz1Double);