java Android应用程序addTextChangedListner

Question

我的代码有问题，当我有超过1个textChangeListener时，它会崩溃。 我认为问题在于不止一次地使用“new TextWatcher”，但我不知道该改成什么

我刚刚开始学习java和应用程序开发，所以代码和变量有点混乱

守则：

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ContextChanged参数中获取输入（字符序列）。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) {

        }
    });
}

我希望它对你有用 您必须为您的计算提供正确的输入，如果您想要输入int，您必须将字符串解析为int，或者如果您想要输入为double，将字符串解析为double并抛出异常