Android Studio意图进行其他活动

Question

f(a, def, c) //Where def would mean default.

★浮动投射结果不会来。

问题发生在受精后。 Android Studio with intent to other activities （原始代码）

[SecondActivity]

intent.putExtra ( "result", (double) kg / (Math.pow (tall, 2)) / 10000);// <SecondActivity> 
     result = intent.getDoubleExtra double ("result", 0); //<ThirdActivity>
     I have tried the following: 

     tall: 150 cm 
     kg: 50kg 
     result: 1.95 .... (original calculations. 19.5) 

    Even if the value does not appear 10 Multiply.

}

[ThridActivity]

public class SecondActivity extends Activity {

RadioGroup rg;
ImageButton button4;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second);

    rg = (RadioGroup) findViewById(R.id.radioGroup);
    button4 = (ImageButton) findViewById(R.id.button4);

    button4.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            RadioButton rd = (RadioButton) findViewById(rg.getCheckedRadioButtonId());
            //String str_Qtype = rd.getText().toString();

            EditText et1 = (EditText) findViewById(R.id.EditText02); // tall (inot typing error)
            EditText et2 = (EditText) findViewById(R.id.EditText01); // kg (not typing error)

            int tall = Integer.parseInt(et1.getText().toString());
            int kg = Integer.parseInt(et2.getText().toString());
            Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
            intent.putExtra("tall", Integer.parseInt(et1.getText().toString()));
            intent.putExtra("kg", Integer.parseInt(et2.getText().toString()));
            intent.putExtra("result",(double)kg/(Math.pow(tall,2))/10000);
            startActivity(intent);
        }
    });
}

Answer 1

要保存该值，请执行以下操作：

intent.putExtra("result",(float) (kg/((tall*0.01)*(tall*0.01))) ); // tall in cm unit

您需要获得float值或另存为int：

float result = intent.getFloatExtra("result", 0f);

[编辑] - 修正码错误

Answer 2

在第二个活动中，您将结果存储在变量tall中，kg创建第三个变量结果并将该变量传递给方法

@Override
        public void onClick(View v) {

            RadioButton rd = (RadioButton) findViewById(rg.getCheckedRadioButtonId());
            //String str_Qtype = rd.getText().toString();

            EditText et1 = (EditText) findViewById(R.id.EditText02); // tall (inot typing error)
            EditText et2 = (EditText) findViewById(R.id.EditText01); // kg (not typing error)

            int tall = Integer.parseInt(et1.getText().toString());
            int kg = Integer.parseInt(et2.getText().toString());
            float result = kg/(tall*0.1)*(tall*0.1))
            Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
            intent.putExtra("tall", tall);
            intent.putExtra("kg", kg);
            intent.putExtra("result",result);
            startActivity(intent);

和第三项活动

float result = intent.getFloatExtra("result",0);