java - Android App addTextChangedListner

Question

我的代码有问题，当我有超过 1 个 textChangeListener 时，它会崩溃。我认为问题在于多次使用“new TextWatcher”，但我不知道将其更改为什么。

我才刚刚开始学习java和app开发，所以代码和变量有点乱。

代码:

editMiles.addTextChangedListener(new TextWatcher() {
    @Override

        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            strMiles = 0 + editMiles.getText().toString();
            intMiles = Integer.parseInt(strMiles);
            editKnots.setText("" + intMiles * 1.15078);
            editKilometers.setText("" + intMiles * 1.852);
        }

        @Override
        public void afterTextChanged(Editable s) {

      }
   });

    editBeaufort.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            strBeaufort = 0 + editBeaufort.getText().toString();
            intBeaufort = Integer.parseInt(strBeaufort);
            editKnots.setText("");
            editKilometers.setText("");
            editMiles.setText("");
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });
}

Answer 1

您必须从 EditText 的 onTextChanged 参数中获取输入(CharSequence s)。因此您的代码将是..

editMiles.addTextChangedListener(new TextWatcher() {
    @Override

        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            strMiles = s.toString().trim();
            intMiles = Integer.parseInt(strMiles);
            editKnots.setText("" + intMiles * 1.15078);
            editKilometers.setText("" + intMiles * 1.852);
        }

        @Override
        public void afterTextChanged(Editable s) {

      }
   });

    editBeaufort.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            strBeaufort = s.toString().trim();
            intBeaufort = Integer.parseInt(strBeaufort);
            editKnots.setText("");
            editKilometers.setText("");
            editMiles.setText("");
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });
}

希望对你有用你必须为你的计算提供正确的输入，如果你想输入 int，你必须将字符串解析为 int，或者如果你想输入为 double，将字符串解析为 double 并抛出异常