問題描述

我想始終以兩位小數顯示 EditText 字段的輸入.因此，當用戶輸入 5 時將顯示 5.00，或者當用戶輸入 7.5 時將顯示 7.50.

I would like to display the input of the EditText fields with two decimals at all times. So when the user enters 5 it will show 5.00 or when the user enters 7.5 it will show 7.50.

除此之外，我還想在字段為空而不是空時顯示零.

Besides that I would like to also show zero when the field is empty instead of nothing.

我已經將輸入類型設置為:

What I've got already is the inputtype set to:

android:inputType="number|numberDecimal"/>

我應該在這里使用輸入過濾器嗎?

Should I work with inputfilters here?

對不起，我對 android/java 還是很陌生...

Sorry I still quite new to android / java...

感謝您的幫助！

有了 nickfox 的回答，我的問題解決了一半.

With the answer of nickfox I was able to solve half of my question.

    et.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {}
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if(s.toString().matches(""))
            {
                et.setText("0.00");
                Selection.setSelection(et.getText(), 0, 4);
            } 
        }
    });

我仍在為我的問題的另一半尋找解決方案.如果我找到了解決方案，我也會在這里發(fā)布.

I'm still working on a solution for the other half of my question. If I found the solution I will post it here too.

OnFocusChangeListener FocusChanged = new OnFocusChangeListener() {

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if(!hasFocus){
            String userInput = et.getText().toString();

            int dotPos = -1;    

            for (int i = 0; i < userInput.length(); i++) {
                char c = userInput.charAt(i);
                if (c == '.') {
                    dotPos = i;
                }
            }

            if (dotPos == -1){
                et.setText(userInput + ".00");
            } else {
                if ( userInput.length() - dotPos == 1 ) {
                    et.setText(userInput + "00");
                } else if ( userInput.length() - dotPos == 2 ) {
                    et.setText(userInput + "0");
                }
            }
        }
    }

推薦答案

這是我用來輸入美元的東西.它確保始終只有小數點后 2 位.您應該能夠通過刪除 $ 符號來適應您的需要.

Here is something I use to for dollar input. It makes sure that there are only 2 places past the decimal point at all times. You should be able to adapt it to your needs by removing the $ sign.

    amountEditText.setRawInputType(Configuration.KEYBOARD_12KEY);
    amountEditText.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {}
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if(!s.toString().matches("^\$(\d{1,3}(\,\d{3})*|(\d+))(\.\d{2})?$"))
            {
                String userInput= ""+s.toString().replaceAll("[^\d]", "");
                StringBuilder cashAmountBuilder = new StringBuilder(userInput);

                while (cashAmountBuilder.length() > 3 && cashAmountBuilder.charAt(0) == '0') {
                    cashAmountBuilder.deleteCharAt(0);
                }
                while (cashAmountBuilder.length() < 3) {
                    cashAmountBuilder.insert(0, '0');
                }
                cashAmountBuilder.insert(cashAmountBuilder.length()-2, '.');
                cashAmountBuilder.insert(0, '$');

                amountEditText.setText(cashAmountBuilder.toString());
                // keeps the cursor always to the right
                Selection.setSelection(amountEditText.getText(), cashAmountBuilder.toString().length());

            }

        }
    });

這篇關于EditText 始終顯示帶 2 位小數的數字的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！