android - 如何将单个 TextWatcher 用于多个 EditText？

Question

我的 View 布局中有三个 EditText 小部件。有没有办法为所有三个 EditTexts 使用单个 TextWatcher？

Answer 1

我刚遇到这个问题。我通过创建一个以 View 作为参数的 TextWatcher 内部类实现来解决它。然后，在方法实现中，只需打开 View 即可查看 Editable 来自哪一个

声明:

private class GenericTextWatcher implements TextWatcher{

    private View view;
    private GenericTextWatcher(View view) {
        this.view = view;
    }

    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

    public void afterTextChanged(Editable editable) {
        String text = editable.toString();
        switch(view.getId()){
            case R.id.name:
                model.setName(text);
                break;
            case R.id.email:
                model.setEmail(text);
                break;
            case R.id.phone:
                model.setPhone(text);
                break;
        }
    }
}

用法:

name = (EditText) findViewById(R.id.name);
name.setText(model.getName());
name.addTextChangedListener(new GenericTextWatcher(name));

email = (EditText) findViewById(R.id.email);
email.setText(model.getEmail());
email.addTextChangedListener(new GenericTextWatcher(email));

phone = (EditText) findViewById(R.id.phone);
phone.setText(model.getPhone());
phone.addTextChangedListener(new GenericTextWatcher(phone));