来自复合控件的onTextChanged

Question

我想让使用EditLine的活动使用EditLine的onTextChanged事件。这有可能吗？

Answer 1

您需要在编辑文本上使用文本观察器来捕获任何编辑文本事件

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

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

    }

    @Override
    public void afterTextChanged(Editable s) {
      if(s.toString().equals("yes")){
      // your code here
          
        }
    }
});

Answer 2

您可以将TextWatcher添加到EditText，并在TextWatcher的onTextChanged(CharSequence s, int start, int before, int count)方法中处理所有文本更改。

示例：

EditText myEditText = findViewById(R.id.my_edit_text);
TextWatcher myTextWatcher = 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) {

        }

        @Override
        public void afterTextChanged(Editable s) {
        //do validation on input here
        //for example
         if(s.toString().equalsIgnoreCase("yes")){
                //then perform some action. 
                // Make your button enable for example
            }
    };
myEditText.addTextChangedListener(myTextWatcher);