尝试从两次不同的按钮点击中添加两个数字的总和

Question

imageview burger = 7.99 when clicked, imageview fries = 2.99 when clicked, I want to get the sum of both however when i click one after the other it refreshes and just addeds the value inside instead of adding on to the previous value. I feel like the solution is right in front of me but i still have no idea what I am missing here...........

public class ThirdActivity extends AppCompatActivity {

static double price1 = 0;
static double price2 = 0;
TextView total;
double bill;
static int but1_value = 0;
static int but1_value1 = 0;
ImageView burger;

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

    TextView tab = (TextView) findViewById(R.id.Table_Size);

    burger = (ImageView) findViewById(R.id.burger);

    total = (TextView) findViewById(R.id.price1);

    final ImageView fries = (ImageView) findViewById(R.id.fries);

    fries.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {



            price2 = price2 + 2.99;

            total.setText("Total: " + price2);


        }
    });


    burger.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            price1 = price1 + 7.99;

            total.setText("Total: " + price1);

        }
    });

Answer 1

In your total you are either setting price1 or price2 .

You should set the addition of two, as your goal is.

total.setText("Total: " + (price1 + price2));

Answer 2

You have assigned a new value to the variable price1 from one place and to price2 from another place.

If you want to maintain the value use a single variable and save in it from both places, or directly add them and set the value.

Use:

total.setText("Total: " + (price1+price2));

I may not have understood your problem. Feel free to clarify it.

Answer 3

The best solution is to create global variable total_price.

private double total_price = 0;

Update the value of total_price whenever you click on fries

total_price += price1

and for burger

total_price += price2

and then set total as

total.setText("Total: " + total_price);