创建统一的 Action1 以对字段执行检查

Question

我试图熟悉 RxBinding 以及它如何应用于简单的表单。我想知道是否有办法创建一个 Action1 来执行检查和更新模型。如果我不够清楚我希望下面的代码能帮助你理解我的意思。

    Observable<CharSequence> nameObservable = RxTextView.textChanges(name).share();
    Action1<CharSequence> validateAction;
    Observable<CharSequence> surnameObservable = RxTextView.textChanges(surname).share();
    Observable<CharSequence> emailObservable = RxTextView.textChanges(mail).share();

    validateAction = new Action1<CharSequence>() {
        @Override
        public void call(CharSequence charSequence) {
            if(state.nameState && state.surnameState && state.emailState)
                submit.setBackgroundColor(getResources().getColor(R.color.green));
            else
                submit.setBackgroundColor(getResources().getColor(R.color.blue));
        }
    };



    Subscription nameState = nameObservable
            .subscribe(new Action1<CharSequence>() {
                @Override
                public void call(CharSequence charSequence) {
                    Log.d("Length","Len : " + charSequence.length());
                    if(charSequence.length() > 5)
                        state.nameState = true;
                    else
                        state.nameState = false;
                }
            });


    Subscription surnameState = surnameObservable
            .subscribe(new Action1<CharSequence>() {
                @Override
                public void call(CharSequence charSequence) {
                    Log.d("Length","Len : " + charSequence.length());
                    if(charSequence.length() > 5)
                        state.surnameState = true;
                    else
                        state.surnameState = false;
                }
            });

    Subscription mailState = emailObservable
            .subscribe(new Action1<CharSequence>() {
                @Override
                public void call(CharSequence charSequence) {
                    Log.d("Length","Len : " + charSequence.length());
                    if(charSequence.length() > 5)
                        state.emailState = true;
                    else
                        state.emailState = false;
                }
            });

    Subscription nameValidate = nameObservable.subscribe(validateAction);
    Subscription surnameValidate = surnameObservable.subscribe(validateAction);
    Subscription mailValidate = emailObservable.subscribe(validateAction);

我创建了一个 Action1，其职责是检查模型的状态并更改按钮的颜色，创建了等于 Observable 数量的订阅并将其作为参数传递。
例如这样的东西

    Action1<CharSequence> lengthCheck = new Action1<CharSequence>() {
        @Override
        public void call(CharSequence charSequence) {
            if(field is name){
                if(charSequence.length() > 5)
                    ...                    
            }
                ...
        }
    };

所以我的问题是，对于检查长度的 Action1，有没有办法成功实现与此类似的操作？像这样放一张支票是正确的地方吗？对我来说，我有完全相同的代码，复制并粘贴了 3 次，只做了很少的改动，这对我来说似乎很愚蠢。
非常感谢您的宝贵时间。

Answer 1

用于名称验证

private Observable<Boolean> getNameObservable() {
    return RxTextView.textChanges(name)
            .map(charSequence -> charSequence.toString().trim().length() > 0);
}

用于姓氏验证

private Observable<Boolean> getSurNameObservable() {
    return RxTextView.textChanges(email)
            .map(charSequence -> charSequence.toString().trim().length() > 0);
}

用于电子邮件验证

private Observable<Boolean> getEmailObservable() {
    return RxTextView.textChanges(email)
            .map(charSequence -> charSequence.toString().trim().length() > 0);
}

使用 combineLatest 将 3 个可观察对象合并为 1 个流

Observable.combineLatest(getNameObservable(),getSurNameObservable(), getEmailObservable,
                    (nameValid, surnameValid,emailValid) -> nameValid && surnameValid && emailValid)
                    .subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(isAllFieldsValid ->
                            enableButton(yourButton, isAllFieldsValid));

启用功能

private void enableButton(Button button, boolean isAvailable) {
    button.setEnabled(isAvailable);
    if (isAvailable) {
        button.setBackgroundResource(R.drawable.green);
    } else {
        button.setBackgroundResource(R.drawable.blue);
    }
}

============================================= ============================ PS：您可以创建一个函数，为 3 EditText

创建一个 Observable

private Observable<Boolean> getNameObservable(EditText et) {
    return RxTextView.textChanges(et)
            .map(charSequence -> charSequence.toString().trim().length() > 0);
}

创建统一的 Action1 以对字段执行检查

Create a uniform Action1 to perform checks on fields

android

rx-java

rx-binding