How to pass double type variable through Bundle class?

Question

I cannot pass a textview value from an Activity A to Activity B to perform some calculations. I tried through the putExtra method to pass variable of type string and then convert to double and could not and already tried also by Bundle and also could not, I can only pass variables of type string independent of which method I use, but I can not convert it. And when sure pass the variables the button to perform the calculations does not work and closes the app. What should I do to be able to pass the variable and make the calculation through the button in Activity B?

Follow the string passing code by Bundle.

excerpt from the Activity A code where the button calls Activity B:

public void padiola (View v){




    Intent telapad = new Intent(this,Padiola.class);

    Bundle parametros = new Bundle();

    String va = vua.getText().toString();
    String vb = vub.getText().toString();

    parametros.putString("chavea", va);
    parametros.putString("chaveb", vb);

    telapad.putExtras(parametros);

    startActivity(telapad);


}

Activity B:

TextView qtda, qtdb, alta, altb, vuar, vubr;


@SuppressLint("SetTextI18n")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_padiola);

    qtda = (TextView) findViewById(R.id.qtdPadareia);
    qtdb = (TextView) findViewById(R.id.qtdPadbrita);
    alta = (TextView) findViewById(R.id.altAreia);
    altb = (TextView) findViewById(R.id.altBrita);
    vuar = (TextView) findViewById(R.id.novoVA);
    vubr = (TextView) findViewById(R.id.novoVB);

    Intent telapad = getIntent();

    Bundle parametros = telapad.getExtras();

    String va1 = parametros.getString("chavea");
    String vb1 = parametros.getString("chaveb");

    vuar.setText(va1);
    vubr.setText(vb1);

}

public void trintaxquarenta(View v) {

    //Para Areia//

    double s1 = Double.parseDouble(vuar.getText().toString());
    double s2 = Double.parseDouble(vubr.getText().toString());

    double s3 = s1 + s2;

    qtda.setText(Double.toString(s3));

}

}

Answer 1

Whoa, blah, blah! Since you had doubts about where and when to retrieve the values in your Activity A, I posted the full code.

In his Activity A:

public class MainActivity extends AppCompatActivity {

    //declarando os campos de valores
    EditText valor1, valor2;
    //Botao para a proxima intent
    Button botaoProximaIntent;
    //valores double para a proxima intent
    double a, b;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        valor1 = findViewById(R.id.valor1);
        valor2 = findViewById(R.id.valor2);
        botaoProximaIntent = findViewById(R.id.botaoProximaIntent);
        //click no botao
        botaoProximaIntent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //faça as validacoes antes de pegar os valores
                //resgate seu double A do editText
                a = Double.parseDouble(valor1.getText().toString());
                //resgate seu double A do editText
                b = Double.parseDouble(valor2.getText().toString());

                //agora temos o valor de a e b, vamos chamar a proxima intent e passar os parametros
                Intent intent = new Intent(MainActivity.this, SegundaActivity.class);
                //declaramos o bundle
                Bundle params = new Bundle();
                //parametros do bundle
                params.putDouble("valor1", a);
                params.putDouble("valor2", b);
                intent.putExtras(params);
                //chamamos a proxima intent
                startActivity(intent);
            }
        });
    }
}

In your Activity B, receive the values:

public class SegundaActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_segunda);
        //declarando os valores
        double a, b;
        // pegando os parametros intent
        Intent intent = getIntent();
        //validando a intent
        if (intent != null)
        {
            Bundle params = intent.getExtras();
            //validando se há parametros
            if  (params != null)
            {
                //resgatando os valores na segunda intent
                a = params.getDouble("valor1");
                b = params.getDouble("valor2");
            }
        }
    }
}