Android 将第一个意向和的值转换为第二个意向和

我在编写体重指数计算器时遇到了麻烦

我想在第二个活动中仅显示已计算的值，但仅当我按下按钮，然后直接转到第二个活动时才计算该值，而不显示任何值

谢谢

主要活动

第二观众

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在按钮侦听器中，请在计算后调用开始活动

Button b = (Button) this.findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {


        String str1 = e1.getText().toString();
        String str2 = e2.getText().toString();

        if (TextUtils.isEmpty(str1)) {
            e1.setError("Insira o peso em Kg");
            e1.requestFocus();
            return;
        }

        if (TextUtils.isEmpty(str2)) {
            e2.setError("Insira a altura em Cm");
            e2.requestFocus();
            return;
        }
        //Get the user values from the widget reference
        float weight = Float.parseFloat(str1);
        float height = Float.parseFloat(str2) / 100;


        float bmiValue = calculateBMI(weight, height);


        String bmiInterpretation = interpretBMI(bmiValue);
        tv4.setText(String.valueOf(bmiValue));


        Intent i = new Intent(MainActivity.this, Resultado.class);
        i.putExtra("result1", tv4.getText().toString());
        startActivity(i);
    }
});

---

完成所有计算后开始您的活动

String bmiInterpretation = interpretBMI(bmiValue);
tv4.setText(String.valueOf(bmiValue));

Intent i = new Intent(MainActivity.this, Resultado.class);
i.putExtra("result1", tv4.getText().toString());
startActivity(i);

Button b = (Button) this.findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {


        String str1 = e1.getText().toString();
        String str2 = e2.getText().toString();

        if (TextUtils.isEmpty(str1)) {
            e1.setError("Insira o peso em Kg");
            e1.requestFocus();
            return;
        }

        if (TextUtils.isEmpty(str2)) {
            e2.setError("Insira a altura em Cm");
            e2.requestFocus();
            return;
        }
        //Get the user values from the widget reference
        float weight = Float.parseFloat(str1);
        float height = Float.parseFloat(str2) / 100;


        float bmiValue = calculateBMI(weight, height);


        String bmiInterpretation = interpretBMI(bmiValue);
        tv4.setText(String.valueOf(bmiValue));


        Intent i = new Intent(MainActivity.this, Resultado.class);
        i.putExtra("result1", tv4.getText().toString());
        startActivity(i);
    }
});

String bmiInterpretation = interpretBMI(bmiValue);
tv4.setText(String.valueOf(bmiValue));

Intent i = new Intent(MainActivity.this, Resultado.class);
i.putExtra("result1", tv4.getText().toString());
startActivity(i);