用户输入运行时android

Question

我正在尝试在Android中构建一个简单的转换器代码（将脚转换为mtr）。我能够这样做但只有当用户点击某个按钮时才能这样做。现在我想修改它，以便它在用户提供输入时开始转换（像谷歌转换器这样的东西）。在Android中有什么办法吗？ 提前谢谢。

Answer 1

将侦听器添加到您的edittext：

yourEditText.addTextChangedListener(addTextWatcher);

添加TextWatcher界面：

private TextWatcher addTextWatcher = new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence sequence, int start, int before, int count) {
        // here is where you could grab the contents of the edittext 
        // input each time a character is entered, and pass the value 
        // off to your unit conversion code. Careful to check for 
        // numerals/decimals only, or to set the proper inputType in 
        // your xml.
    }
    @Override
    public void beforeTextChanged(CharSequence sequence, int start, int count, int after) { 

    }
    @Override
    public void afterTextChanged(Editable sequence) { 

    }
};