高度转换 - 厘米到英尺和英寸（反之亦然）(Height Conversion - cm to feet and inches (and vice versa))

 我有一个编辑文本，用户可以用厘米以及英尺+英寸输入他的身高，例如。 5'11“。我有一个目标单位的切换按钮，所以我希望当用户选择厘米时，它应该将输入的文本从英尺+英寸转换为厘米，反之亦然。现在当我将高度转换为厘米，它最后加上“\”“。 我认为这是因为我已经提出了文本观察者，当计数达到3时，最后添加“\”。 
 
public void onClick(View view) {
    switch (view.getId())
    {
        case R.id.btnCm:
            toggleHeightButton(R.id.btnCm,R.id.btnFeet,false);
            convertToCentimeter(enter_height);
            break;
        case R.id.btnFeet:
            toggleHeightButton(R.id.btnFeet,R.id.btnCm,true);
            enter_height.addTextChangedListener(new CustomTextWatcher(enter_height));
            break;
        case R.id.btnKg:
            toggleweightButton(R.id.btnKg,R.id.btnpound,false);
            break;
        case R.id.btnpound:
            toggleweightButton(R.id.btnpound,R.id.btnKg,true);
            break;
    }
}

public class CustomTextWatcher implements TextWatcher {
    private EditText mEditText;

    public CustomTextWatcher(EditText enter_height) {
        mEditText = enter_height;
    }

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

    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    public void afterTextChanged(Editable s) {
        int count = s.length();
        String str = s.toString();
        if (count == 1) {
            str = str + "'";
        } else if (count == 2) {
            return;
        } else if (count == 3) {
            str = str + "\"";
        } else if ((count > 4) && (str.charAt(str.length() - 1) != '\"') ){
            str = str.substring(0, str.length() - 2) + str.charAt(str.length() - 1) + "\"";
        } else {
            return;
        }

        mEditText.setText(str);
        mEditText.setSelection(mEditText.getText().length());
    }
}

I have an edit text in which the user can enter his height in centimeters as well as in feet+inches, eg. 5'11". I have a toggle button for the target unit, so I want that when the user selects centimeters, it should convert the entered text from feet+inches into centimeters, and vice versa. Now when I am converting the height to centimeters it's adding "\"" at the end. I think it's because of the text watcher I have put which add "\"" at the end when count is reaching to 3.
 
public void onClick(View view) {
    switch (view.getId())
    {
        case R.id.btnCm:
            toggleHeightButton(R.id.btnCm,R.id.btnFeet,false);
            convertToCentimeter(enter_height);
            break;
        case R.id.btnFeet:
            toggleHeightButton(R.id.btnFeet,R.id.btnCm,true);
            enter_height.addTextChangedListener(new CustomTextWatcher(enter_height));
            break;
        case R.id.btnKg:
            toggleweightButton(R.id.btnKg,R.id.btnpound,false);
            break;
        case R.id.btnpound:
            toggleweightButton(R.id.btnpound,R.id.btnKg,true);
            break;
    }
}

public class CustomTextWatcher implements TextWatcher {
    private EditText mEditText;

    public CustomTextWatcher(EditText enter_height) {
        mEditText = enter_height;
    }

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

    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    public void afterTextChanged(Editable s) {
        int count = s.length();
        String str = s.toString();
        if (count == 1) {
            str = str + "'";
        } else if (count == 2) {
            return;
        } else if (count == 3) {
            str = str + "\"";
        } else if ((count > 4) && (str.charAt(str.length() - 1) != '\"') ){
            str = str.substring(0, str.length() - 2) + str.charAt(str.length() - 1) + "\"";
        } else {
            return;
        }

        mEditText.setText(str);
        mEditText.setSelection(mEditText.getText().length());
    }
}

原文：https://stackoverflow.com/questions/39423348