在LinearLayout中自动计算毛利

LinearLayout layout = findViewById(R.id.linearLayout);
EditText costEditText = findViewById(R.id.costEditText);
EditText priceEditText = findViewById(R.id.priceEditText);
TextView profitTextView = findViewById(R.id.profitTextView);

costEditText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // 空实现
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        calculateProfit();
    }

    @Override
    public void afterTextChanged(Editable s) {
        // 空实现
    }
});

priceEditText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // 空实现
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        calculateProfit();
    }

    @Override
    public void afterTextChanged(Editable s) {
        // 空实现
    }
});

private void calculateProfit() {
    String costString = costEditText.getText().toString();
    String priceString = priceEditText.getText().toString();

    if (!costString.isEmpty() && !priceString.isEmpty()) {
        double cost = Double.parseDouble(costString);
        double price = Double.parseDouble(priceString);
        double profit = price - cost;
        profitTextView.setText(String.valueOf(profit));
    }
}