android从一个输入中减去另一个输入

我有两个物体

obj.targetWeight = targetWeight.getText().toString();
obj.currentWeight = currentWeight.getText().toString();

我想从另一个中减去一个

我试过这个，但运气不好

if (obj != null){
    outputEditText.setText("Your target weight is " + obj.targetWeight + 
                            "\n Your current weight is " + obj.currentWeight + "\n" 
                        + (obj.currentWeight - obj.targetWeight));
}

---

我很确定这不是应该做的，但是我不知道怎么做。

你必须先把它们转换成整数

if (obj != null) {
    int targetWeight = Integer.parseInt(obj.targetWeight.getText().toString());
    int currentWeight = Integer.parseInt(obj.currentWeight.getText().toString());
    outputEditText.setText(
        "Your target weight is " + obj.targetWeight + "\n" + 
        "Your current weight is " + obj.currentWeight + "\n" +
        "Difference is " + (currentWeight - targetWeight));
    }
}

---

你必须先把它们转换成整数

if (obj != null) {
    int targetWeight = Integer.parseInt(obj.targetWeight.getText().toString());
    int currentWeight = Integer.parseInt(obj.currentWeight.getText().toString());
    outputEditText.setText(
        "Your target weight is " + obj.targetWeight + "\n" + 
        "Your current weight is " + obj.currentWeight + "\n" +
        "Difference is " + (currentWeight - targetWeight));
    }
}

---

多亏了凯龙，我才有了答案

if (obj != null) {
        int targetWeight = Integer.parseInt(obj.targetWeight);
        int currentWeight = Integer.parseInt(obj.currentWeight);
        outputEditText.setText(
            "Your target weight is " + obj.targetWeight + "\n" + 
            "Your current weight is " + obj.currentWeight + "\n" +
            "Difference is " + (targetWeight - currentWeight ));
        }

---

多亏了凯龙，我才有了答案

if (obj != null) {
        int targetWeight = Integer.parseInt(obj.targetWeight);
        int currentWeight = Integer.parseInt(obj.currentWeight);
        outputEditText.setText(
            "Your target weight is " + obj.targetWeight + "\n" + 
            "Your current weight is " + obj.currentWeight + "\n" +
            "Difference is " + (targetWeight - currentWeight ));
        }

---

我添加了代码示例，以显示我输入的代码段应该放在哪里以及如何使用它。如果这仍然不是你想要的，你能更新你的问题，你说它不工作是什么意思吗？嗨。谢谢你的回复。我在“（targetWeight.getText（）.toString（））上遇到以下错误；无法在基元类型int上调用getText（）”（同样适用于currentweight）我添加了代码示例，以显示我输入的代码段应该放在哪里以及如何使用它。如果这仍然不是你想要的，你能更新你的问题，你说它不工作是什么意思吗？嗨。谢谢你的回复。我在“（targetWeight.getText（）.toString（））上遇到以下错误；无法在基元类型int上调用getText（）”（同样适用于currentweight）请在下次改进您的问题。检查你的拼写和格式。谢谢你的输入，下次请改进你的问题。检查你的拼写和格式。谢谢你的意见