@Override

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    et1=(EditText) findViewById(R.id.et1);
    et2=(EditText) findViewById(R.id.et2);
    EditText[] arr=new EditText[]{et1,et2};
    for (int i = 0; i < arr.length; i++) {
        arr[i].addTextChangedListener(new NewTextWatcher(arr[i]));
    }
}
class NewTextWatcher implements TextWatcher{
    private EditText editText;
    
    
    public NewTextWatcher(EditText editText) {
        this.editText = editText;
        
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // TODO Auto-generated method stub
        
    }

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

    @Override
    public void afterTextChanged(Editable s) {
        String msg4=editText.getText().toString();
        System.out.println(msg4);
        
    }
}

这个代码执行的时候上下两个edittext 在第一个edittext中输入后 在logcat中只有一条输出 但是在第二个edittext中输入一个数字之后 就会在logcat中输入两个日志 被执行了两次