java - 在运行时更新默认值并在 android studio 中使用新值进行计算

Question

所以我有三项 Activity 。其中一个用于接受用户的输入，如果所有输入均已填写，则使用下一步按钮移动到第二个 Activity 。

第二个 Activity 可用于接受和更新第二个类中用于执行计算的一些已定义的值，保存按钮用于保存新值，完成按钮用于执行计算并在上一个 Activity 中显示结果。

每次我在输入后单击保存按钮决定使用一组新值时，如何更新第二个 Activity/类？

第一个 Activity

<EditText
    android:id="@+id/first_number"
    android:layout_width="304dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="10dp"
    android:layout_marginEnd="16dp"
    android:layout_marginRight="16dp"
    android:background="@drawable/edittext_bg"
    android:ems="10"
    android:hint="Enter first Number"
    android:inputType="number"
    android:paddingStart="20dp"
    android:paddingEnd="10dp"
    android:paddingLeft="20dp"
    android:paddingTop="10dp"
    android:paddingRight="10dp"
    android:paddingBottom="10dp"
    android:textSize="14sp" />

<EditText
    android:id="@+id/second_number"
    android:layout_width="304dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="10dp"
    android:layout_marginEnd="16dp"
    android:layout_marginRight="16dp"
    android:background="@drawable/edittext_bg"
    android:ems="10"
    android:hint="Enter second Number"
    android:inputType="number"
    android:paddingStart="20dp"
    android:paddingEnd="10dp"/>

<EditText
    android:id="@+id/third_number"
    android:layout_width="304dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="10dp"
    android:layout_marginEnd="16dp"
    android:layout_marginRight="16dp"
    android:background="@drawable/edittext_bg"
    android:ems="10"
    android:hint="Enter second Number"
    android:inputType="number"
    android:paddingStart="20dp"
    android:paddingEnd="10dp"/>

<Button
    android:id="@+id/btn_next"
    android:layout_width="145dp"
    android:layout_height="49dp"
    android:layout_marginTop="8dp"
    android:background="@drawable/curved_button"
    android:paddingStart="5dp"
    android:paddingEnd="19dp"
    android:paddingRight="10dp"
    android:paddingLeft="2dp"
    android:drawableLeft="@drawable/add_button_image"
    android:text="@string/Next"
    android:textAllCaps="false"
    android:textColor="@android:color/background_light"
    android:typeface="serif"
    app:layout_constraintEnd_toEndOf="parent" />


SECOND ACTIVITY
<EditText
    android:id="@+id/contingencyFee"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="30dp"
    android:background="@color/pageColor"
    android:clickable="false"
    android:cursorVisible="false"
    android:focusable="false"
    android:focusableInTouchMode="false"
    android:hint="@string/contingency"
    android:inputType="none"
    android:textSize="16sp" />

<EditText
    android:id="@+id/projectManagement"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="30dp"
    android:background="@color/pageColor"
    android:clickable="false"
    android:cursorVisible="false"
    android:focusable="false"
    android:focusableInTouchMode="false"
    android:hint="@string/projectFee"
    android:inputType="none"
    android:textSize="16sp" />

<EditText
    android:id="@+id/externalWorks"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="30dp"
    android:background="@color/pageColor"
    android:clickable="false"
    android:cursorVisible="false"
    android:focusable="false"
    android:focusableInTouchMode="false"
    android:hint="@string/externalWorks"
    android:inputType="none"
    android:textSize="16sp" />

<Button
    android:id="@+id/save_button"
    android:layout_width="wrap_content"
    android:layout_height="38dp"
    android:layout_marginStart="120dp"
    android:layout_marginLeft="120dp"
    android:layout_marginTop="20dp"
    android:layout_marginBottom="52dp"
    android:onClick="saveButton"
    android:background="@drawable/save_button"
    android:text="@string/inputVariableSaveButton"          
    android:textColor="@android:color/background_light"           
    app:layout_constraintBottom_toTopOf="@+id/textView16"          
    app:layout_constraintEnd_toStartOf="@+id/proceedBtn"
    app:layout_constraintHorizontal_bias="0.464"                 
    app:layout_constraintTop_toBottomOf="@+id/scrollView3"
    app:layout_constraintVertical_bias="0.483" />

<Button
    android:id="@+id/proceed_button"
    android:layout_width="116dp"
    android:layout_height="32dp"
    android:layout_marginTop="8dp"
    android:layout_marginBottom="52dp"
    android:onClick="proceed"
    android:text="@string/defaultVariable"
    android:textAllCaps="false"
    android:textColor="@android:color/background_light"
    android:textSize="18sp"
    app:layout_constraintBottom_toTopOf="@+id/textView16"
    app:layout_constraintEnd_toEndOf="parent"

FIRST CLASS

btn_next.setOnClickListener(new View.OnClickListener(){
        @RequiresApi(api = Build.VERSION_CODES.N)
        public void onClick(View v){
            try{

// **** VALUES FROM THE FIRST ACTIVITY

                double first_number = 
Double.valueOf(first_number.getText().toString());
                double firstNumberTotal = first_number* /* 
(250*70000)*/  17500000;

                double second_number = 
Double.valueOf(second_number.getText().toString());
                double secondNumberTotal = second_number * /* 
(214*70000)*/ 14980000;

                double third_number = 
Double.valueOf(third_number.getText().toString());
                double thirdNumberTotal = third_number * /* 
(140*70000)*/ 9800000;

            }catch (Exception ex){
                return;
            }
        }
    });


 SECOND CLASS
 save_button.setOnClickListener(new View.OnClickListener(){
        @RequiresApi(api = Build.VERSION_CODES.N)
        public void onClick(View v){
            try{

                // VALUES FROM SECOND ACTIVITY
        double contingencyFee = 
        Double.valueOf(contingencyFeet.getText().toString());
                double contingencyTotal = contingencyFee * 
        1.015; /*UPDATE THIS WITH NEW VALUE*/


      double projectManagement = 
      Double.valueOf(projectManagement.getText().toString());
      double totalProjectCost = projectManagemen * 
      1.2; /*UPDATE THIS WITH NEW VALUE*/

      double externalWorks = 
      Double.valueOf(externalWorks.getText().toString());
                double externalWorksCost = externalWorks * 
      1.15; /*UPDATE THIS WITH NEW VALUE*/

            }catch (Exception ex){
                return;
            }
        }
    });

Answer 1

按钮点击中的第一个 Activity

intent = new Intent(FirstActivity.this, SecondActivity.class);
                    intent.putExtra("firstno", String.valueOf(firstnumber));
                    intent.putExtra("secondno", String.valueOf(secondnumber));
                    intent.putExtra("thirdno", String.valueOf(thirdnumber));
                    startActivity(intent);

加载第二个 Activity

String firstNo, SecondNo, ThirdNo;
 firstNo = getIntent().getExtras().getString("firstno");
 SecondNo = getIntent().getExtras().getString("secondno");
 ThirdNo = getIntent().getExtras().getString("thirdno");

编辑内容

Double firstNo, SecondNo, ThirdNo;
firstNo = Double.parseDouble(getIntent().getExtras().getString("firstno"));
SecondNo = Double.parseDouble(getIntent().getExtras().getString("secondno"));
ThirdNo = Double.parseDouble(getIntent().getExtras().getString("thirdno"));

textView.setText(String.valueOf(firstNo + SecondNo + ThirdNo));